What steps are important in the process of creating a scientific theory? (1 point)
hypothesizing, observing, and testing
creating a prototype and trouble-shooting
analyzing, offering an opinion, and evaluating
trouble-shooting, hypothesizing, and evaluating

Answers

Answer 1

The important steps in the process of creating a theory are the following: hypothesizing, observing, and testing.  You first conduct observation to identify problem or situation that will lead to your theory. Next step is to formulate an intelligent guess called as the hypothesis. This hypothesis will be tested if it fit to be a theory.


Related Questions

Which of the following correctly describes the size of meteoroids?

Answers

meteoroids are smaller than comets and asteroids.

Answer:

The correct answer is C. Meteoroids are smaller than comets and asteroids

Explanation:  Asteroids go as far as a kilometer in size while meteoroids can be as big as a house. Comets are out of all comparison as they can be up to 80 000 km long.

Which of the following radioisotopes is naturally occurring?

93^239Np

53^131I

102^254No

96^242Cm

Answers

The answer is 53^131I.

This is a radioisotope of iodine. It also has a radioactive half life decay of about 8 days.

Answer:

I - 131 is the correct answer.

I - 131 is the only naturally occuring radioactive isotope among these four options.

Explanation:

Np - 239 - Neptunium is also considered as an artificial element,as only trace amounts of it are found in nature.

And Np - 239 is not a naturally occuring radioactive isotope but it is synthesized artificially.

No - This is an artificial element.That means its not found in nature. Hence all its isotopes are also synthesized artificially.

Cm - This is also an artificial element and all its isotopes are also synthesized artificially.

Np - 239,No - 254,Cm - 242 are radioactive isotopes but they are not naturally occuring radioactive isotopes. But these three are artificially made radioactive isotopes.

And Iodine - 131 is the only naturally occuring radioisotope among these.

if a solution has a hydronium ion concentration of 1x10^-9 m the solution is
a) acidic and has a pH of 5
b) basic and has a pH of 9
c) basic and has a pH of 5
d) acidic and has a pH of 9

Answers

b) basic and has a pH of 9

The acidity or alkalinity of a solution depends upon the hydronium ion concentration and hydroxide ion concentration. If a solution has a hydronium ion concentration of 1x10⁻⁹ m the solution is basic. The correct option is B.

What is pH of a solution?

The pH of a solution is defined as the negative logarithm to the base 10 of the value of the hydronium ion concentration in moles per litre. The pH scale introduced by Sorensen is more convenient in expressing the hydronium ion concentration of a solution.

The pH can be calculated as:

pH = -log [H₃O⁺]

If the concentration of [H₃O⁺] is less than 10⁻⁷ M, then the solution is found to be basic.

Here pH is:

pH = - log [1 x 10⁻⁹]

= 9

So the pH of the solution is 9.

Thus the correct option is B.

To know more about pH, visit;

https://brainly.com/question/10829073

#SPJ3

A sample of chlorine gas is confined in a 5.0 L container at 328 torr and 37 degrees C. How many moles of gas are in the sample?

PLEASE HELP!!! BIG TEST TMRRW!!!! WORK WOULD BE GREATLY APPRECIATED

Answers

The  number of moles  of   gas  in  the  sample   of  chlorine  gas   is  calculated    by  use   of  ideal  gas  equation 
that  is  PV=nRT
n=number   of  moles
R= gas  constant  (  62.36367 l.torr/k.mol)
P=pressure
V=volume
from  ideal  gas  equation  n=  PV/RT
n=  (328  x5.0)/ ( 62.36367  x310)=  0.085  moles

Answer:

what he/she/they said

Explanation:

In the balanced reaction below, what is the mole ratio comparing iron (Fe) and oxygen gas (O2)?

4Fe + 3O2 --> 2Fe2O3

Question options:

4:2


1:3


2:3


4:3

Answers

Do you know the answers to this quiz?? I'm taking it right now

The given balanced reaction is,

[tex] 4Fe(s) + 3O_{2}(g) --->2Fe_{2}O_{3} (s) [/tex]

The stoichiometric coefficients of each element or compound represents the number of moles of that element or compound required for the complete reaction to take place.

The mole ratios of different products and reactants will be:

[tex] \frac{Fe}{O_{2}} = \frac{4 mol Fe}{3 mol O_{2}} [/tex]

[tex] \frac{Fe}{Fe_{2}O_{3}} = \frac{4 mol Fe}{2 Fe_{2}O_{3}} [/tex]

[tex] \frac{O_{2}}{Fe_{2}O_{3}} =\frac{3 mol O_{2}}{2molFe_{2}O_{3}} [/tex]

So the mole ratio comparing iron (Fe) and oxygen gas ([tex] O_{2} [/tex]) is

4 : 3

which atoms exist as diatomic molecules?

Answers

If the diatomic molecule consists of atoms from two different elements, then it is aheteronuclear diatomic molecule. There are seven elements that naturally occur as homonucleardiatomic molecules in their gaseous states: hydrogen,nitrogen, oxygen, fluorine,chlorine, bromine, and iodine

Sodium tends lose a single electron in natural settings. Based on what you know, what are two other elements that tend to do the same thing?

Question 4 options:

sodium and magnesium

hydrogen and helium

beryllium and boron

potassium and rubidium
**I said D**,

Answers

Pottasium and rubidium are quite similar and lose an electron in a natural setting. Both elements are known to ignite spontaneously in air. Rubidium forms amalgams with mercury and alloys with gold, iron, caesium, sodium, and potassium. It does not do so with lithium.

Answer:

D. potassium and rubdium

#1: A gas effuses 4.0 times faster than oxygen (O2). What is the molecular mass of the gas?

A. 1.0 g/mol

B. 2.0 g/mol

C. 4.0 g/mol

D. 7.67 g/mol

**not sure... i think it's either B or C... what do u thinK? @Mertsj :),

Answers

From Graham's law of diffusion
R1/R2 = √M2/M1 where R1 and R2 is the rate of diffusion of Oxygen and
unknown gas respectively
M1 and M2 is the molar mass of Oxygen and unknown gas respectively 
So R2 = 4 * R1
M1 = 32 and M2 = ?
So we have R1/ 4 R1 = √ x/32
(1/16) = x/32
X = 32 /16 = 2 g/mol


If a gas effuses 4.0 times faster than oxygen (O2), the molecular mass of the gas is 2.0 g/mol.

HOW TO USE GRAHAM LAW OF DIFFUSION?

The molecular mass of a gas can be calculated using Graham's equation of diffusion as follows:

R1/R2 = √M2/M1

Where R1 and R2 are the rate of diffusion of oxygen and unknown gas respectivelyM1 and M2 is the molecular mass of oxygen and unknown gas respectively

Since the gas effuses 4.0 times faster than oxygen;

R1 = ?R2 = 4R1M1 = 32g/molM2 = ?

R1/4R1 = ✓32/M2

(1/16) = x/32

16x = 32

x = 2g/mol

Therefore, If a gas effuses 4.0 times faster than oxygen (O2), the molecular mass of the gas is 2.0 g/mol.

Learn more about Graham's law of diffusion at: https://brainly.com/question/2681511

Which one has more mass a bag of cotton balls or a bag of nails and explain

Answers

You would think that the bag of nails would have more mass but their masses are identical. If you were to put them both in a vacuum chamber and let them fall from a great height, they would fall the same speed. The vacuum chamber would suck all of the air out of the cotton balls, thus making it heavier and weigh the same as the bag of nails.

Hopefully this is helpful and makes sense.

At STP, two 5.0-gram solid samples of different ionic compounds have the same density. These solid samples could be dominated by their

Answers

Missing question:
1) mass.   
2) volume.
3) temperature.
4) solubility in water.
Answer is: 4) solubility in water.
This ionic solids can not be differentiated by mass, because they have same mass (5 g), neither by volume because they have same mass and density, than either and volume (d = m/V), solubility of compound is differente because different ions.

The correct answer is option (b).  At STP, two 5.0-gram solid samples of different ionic compounds have the same density. These solid samples could be dominated by their crystal structures.

A) Molar masses: The molar mass of a compound refers to the mass of one mole of that substance. While the molar mass affects the mass of the compound, it does not directly determine the density unless the volume occupied by the same mass of different compounds is considered.

B) Crystal structures: The crystal structure refers to the arrangement of ions in a solid. If two ionic compounds have the same density, it is likely that their ions are packed in a similar manner, resulting in the same volume for the same mass. The crystal structure determines how closely the ions are packed together, which directly influences the density.

C) Ionic charges: While ionic charges influence the electrostatic forces between ions, they do not directly determine the density of a solid. The arrangement of ions (crystal structure) has a more direct impact on density than the charges of the ions themselves.

D) **Solubilities**: The solubility of a compound refers to how well it dissolves in a solvent, such as water. This property does not affect the density of the solid form of the compound.

The complete question is:

At STP, two 5.0-gram solid samples of different ionic compounds have the same density. These solid samples could be dominated by their __________.

A) molar masses  

B) crystal structures  

C) ionic charges  

D) solubilities  

Which property could be a dominant factor for these solid samples to have the same density?

Help please? Will give brainliest...!!!!!!!

Answers

the answer would be A

which of these stars is least likely to be categorized as a supergiant? A. Betelgeuse B. Pollux C. Sirius A D. Sun Reset Submit

Answers

Answer: The correct answer is option D.

Explanation: Super-giant stars are the stars which are greater than Sun. They have a mass hundred time greater than Sun and can be thousand times greater than Sun.

The masses of the stars are represented in Solar masses which is the mass of the Sun.

Mass of Betelgeuse = 20 Solar masses

Mass of Pollux = 1.7 Solar masses

Mass of Sirius = 2.02 Solar masses

Mass of Sun = 1 Solar mass.

As, the mass of Sun is the least from the given stars. Hence, it is least considered as a super-giant.

Final answer:

Pollux is the least likely to be categorized as a supergiant since it is an evolved giant star, while Betelgeuse is a known red supergiant, and both Sirius A and the Sun are main-sequence stars.

Explanation:

The star least likely to be categorized as a super giant among the options provided is Pollux. Betelgeuse is a well-known red super giant that is visible near Orion's belt as the bright red star marking the hunter's shoulder. Pollux, in contrast, is classified as an evolved giant star (a red giant), which is a less massive and less luminous stage compared to a super giant. Option B

Sirius A, known for being the brightest star in the sky after the Sun, is a main-sequence star, and also not a super giant. The Sun itself is a main-sequence star, not nearly massive enough to ever become a super giant. Therefore, while neither Pollux, Sirius A, nor the Sun are super giants, Pollux being an evolved giant is the furthest in its life cycle from the super giant category compared to the main-sequence state of Sirius A and the Sun.

Which are isotopes? an atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has which are isotopes? an atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has an atomic number of 20 and a mass number of 40. an atomic number of 21 and a mass number of 42. 22 protons and 20 neutrons. 22 neutrons and 20 protons?

Answers

Isotopes have the same atomic number or same number Protons, but different mass number or neutrons.

You can say atomic number or protons.

22 neutrons 20 protons
atomic number 20 and a mass number 40
Atomic number 20 and mass # 42

Explanation:

Isotopes are defined as the species which contain same number of protons but different number of neutrons.

As the sum of all the protons present in an atom is known as atomic number. Whereas the sum of total number of protons and neutrons is known as atomic mass.

Hence, isotopes are also defined as atoms with same atomic number but different atomic mass.

For example, an atom that has an atomic number of 20 and a mass number of 42 will contain the following number of neutrons.

                 Mass number = no. of protons + no. of neutrons

                            42 = 20 + no. of neutrons

                 no. of neutrons = 42 - 20

                                            = 22

So, isotope of this atom could be [tex]^{40}_{20}A[/tex]. This means that an element with atomic number of 20 and a mass number of 40.

Thus, we can conclude that an atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has an atomic number of 20 and a mass number of 40.

Since, both of them contains same number of protons but different number of neutrons.

What is the total pressure in a 6.00-l flask which contains 0.127 mol of h2(g) and 0.288 mol of n2(g) at 20.0°c?

Answers

Answer: 1.66 atm

Data:

P = ?
V = 6.00 liter
n1 = 0.127 mol of H2(g)
n2 = 0.288 mol of N2(g)
T = 20.0°C

Formula:

PV = n RT

Solution:

1) Conversion of units:

 =  20 + 273.15 K = 293.15 K

2) n = n1 + n2 = 0.127 mol + 0.288 mol = 0.415 mol

3) PV = nRT => P = nRT / V

R = 0.0821 atm*liter / (K*mol)

P = 0.415 mol * 0.0821 atm * liter / (K*mol) * 293.15 K / 6 liter = 1.66 atm

Answer: 1.66 atm
Final answer:

The total pressure in a 6.00-L flask with a mixture of 0.127 mol H₂ and 0.288 mol N₂ at 20.0°C is calculated using the ideal gas law PV = nRT. After converting the temperature to Kelvin and determining the total moles of gas, the pressure is found to be approximately 1.68 atm.

Explanation:

To calculate the total pressure in a 6.00-L flask containing 0.127 mol of H₂(g) and 0.288 mol of N₂(g) at 20.0°C, we can use the ideal gas law, which is PV = nRT. Here, P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.

First, convert temperature from Celsius to Kelvin: T = 20.0 + 273.15 = 293.15 K.

Next, use R = 0.0821 L·atm/(K·mol), which is the ideal gas constant appropriate when pressure is in atmospheres and volume is in liters.

Combine the moles of gases: total moles (n₂₄₂al) = 0.127 mol H₂ + 0.288 mol N₂ = 0.415 mol.

Then calculated the pressure using the ideal gas law: P = (nRT)/V = (0.415 mol * 0.0821 L·atm/(K·mol) * 293.15 K) / 6.00 L = 1.68 atm (rounded to two decimal places).

The total pressure in the flask at 20.0°C is therefore approximately 1.68 atmospheres.

Learn more about total pressure here:

https://brainly.com/question/30255561

#SPJ3

Check my answers?

Which of the following best describes the motion of the particles in a piece of steel?
None are moving
A few are moving
X All are moving (my choice)
Most are moving

Most solids_____
X are dense and difficult to compress (my answer)
are able to flow
are amorphous
have a disorderly structure

Cyrstals are classified into how many different crystal systems?
4
5
6
X 7 (my answer)

Thanks!

Answers

The answers are the following:
1.All are moving
2. are dense and difficult to compress
3. 7

Your answers are correct.

1. All are moving

2. Are dense and difficult to compress

3.

All are correct... 3/3 100%

Determine the entropy change when 1.80 mol of HBr(g) condenses at atmospheric pressure?

Answers

Answer:

Entropy change = -168.3 J/mol-K

Explanation:

The entropy change is expressed as:

[tex]DeltaS = \frac{DeltaH}{T}[/tex]

For HBr, the enthalpy of condensation = -19.27 kJ/mol

Temperature T = -67 C = 273 - 67 = 206 K

Therefore, the entropy change when 1 mol of HBr condenses is:

= [tex]\frac{-19.27 kJ/mol}{206 K} =0.0935 kJ/mol-K = -93.5 J/mol-K[/tex]

Thus for the given 1.80 mol of HBr the entropy change would be:

[tex]= 1.80 mol * -93.5 J/mol- K = -168.3 J/mol-K[/tex]

Final answer:

The entropy change when 1.80 mol of HBr(g) condenses at atmospheric pressure can be determined using the equation ΔS = -ΔH/T, where ΔH is the enthalpy change and T is the temperature.

Explanation:

The entropy change when a substance condenses can be calculated using the following equation:

∆S = -∆Hvap / T

where:

∆S is the entropy change (J/K·mol)

∆Hvap is the enthalpy of vaporization (kJ/mol)

T is the temperature of condensation (K)

The enthalpy of vaporization of HBr is -19.27 kJ/mol. The temperature at which HBr condenses at atmospheric pressure is its boiling point, which is -67°C. Converting this temperature to Kelvin, we get:

T = -67°C + 273.15 K = 206.15 K

Plugging in these values, we get:

∆S = -(-19.27 kJ/mol) / 206.15 K = 0.09348 kJ/K·mol

Converting kJ to J, we get:

∆S = 0.09348 kJ/K·mol * 1000 J/kJ = 93.48 J/K·mol

Therefore, the entropy change when 1.80 mol of HBr(g) condenses at atmospheric pressure is -168.3 J/K·mol.

Learn more about Entropy change here:

https://brainly.com/question/32484278

#SPJ12

What is the balanced chemical equation for the reaction used to calculate ΔH∘f of SrCO3(s)?
If fractional coefficients are required, enter them as a fraction (i.e. 1/3). Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively without indicating allotropes. Use (aq) for aqueous solution.

Answers

Based on your problem above, we have to balance the equation in order to get the product.
From your given, ΔH∘f of SrCO3(s)
The balanced equation is:
Sr(s) + C(s) + 3/2 O2(g) -> SrCO3(s)

Answer:

[tex]Sr(s)+C(s)+ 3/2O_{2}(g)\rightarrow SrCO_{3}(s)[/tex]

Explanation:

The standard enthalpy of formation (ΔH°f) is defined as the enthalpy change which accompanies the formation of 1 mole of a compound from its constituent elements all of which are in their standard states i.e. either solid (s), liquid (l) , gas (g) or the aqueous phase (aq).

Strontium carbonate (SrCO3) contains 3 elements:

-Strontium (Sr) where the standard state is solid(s)

- Carbon (C) where the standard state is again a solid (s)

- oxygen (O) where the standard state is the gas phase (g)

The balanced chemical equation for the standard enthalpy of formation (ΔH°f) for SrCO3 would be:

[tex]Sr(s)+C(s)+ 3/2O_{2}(g)\rightarrow SrCO_{3}(s)[/tex]

1. What mass of H2O will be produced if 9.5 g of H2 reacts with 1.2 g of O2?

__ H2 + __ O2 --> __ H2O

2. If 1.85 g of Mg(OH)2 reacts with 3.71 g of HCl, how much MgCl2 is produced? What is the limiting reactant?

__ Mg(OH)2 + __ HCl --> __ MgCl2 + __ H2O

3. What mass of potassium hydroxide is formed when 8.2 g of potassium oxide is added to 1.3 g of water?

__ K2O + __ H2O --> __ KOH

4. What mass of aluminum chloride could be made from 8.1 g of aluminum and 4.2 L of chlorine at STP?

__ Al + __ Cl2 --> __ AlCl3


I know this is a lot of questions but please help and show your work. Thank you.

Answers

This is the number 3..

1) The answer is: mass of water is 1.35 grams.

Balanced chemical reaction: 2H₂ + O₂ → 2H₂O.

m(O₂) = 1.2 g; mass of oxygen.

M(O₂) = 2 · 16 g/mol.

M = 32 g/mol, molar mass of oxygen.

n(O₂) = m(O₂) ÷ M(O₂).

n(O₂) = 1.2 g ÷ 32 g/mol.

n(O₂) = 0.0375 mol; amount of oxygen, limiting reactant.

m(H₂) = 9.5 g; mass of hydrogen.

M(H₂) = 2 g/mol, molar mass of hydrogen.

n(H₂) = m(H₂) ÷ M(H₂).

n(H₂) = 9.5 g ÷ 2 g/mol.

n(H₂) = 4.5 mol; amount of hydrogen.

From chemical reaction: n(O₂) : n(H₂O) = 1 : 2.

n(H₂O) = 0.0375 mol · 2.

n(H₂O) = 0.075 mol; amount of water.

m(H₂O) = n(H₂O) · M(H₂O).

m(H₂O) = 0.075 mol · 18 g/mol.

m(H₂O) = 1.35 g; mass of water.

2) The answer is: 3.05 grams of MgCl₂ is produced, the limiting reactant is Mg(OH)₂.

Balanced chemical reaction: 2HCl + Mg(OH)₂ → MgCl₂ + 2H₂O.

m(Mg(OH)₂) = 1.85 g; mass of magnesium hydroxide

n(Mg(OH)₂) = m(Mg(OH)₂) ÷ M(Mg(OH)₂).

n(Mg(OH)₂) = 1.85 g ÷ 58.32 g/mol.

n(Mg(OH)₂) = 0.032 mol; limiting reactant.

m(HCl) = 3.71 g; mass of hydrochloric acid.

n(HCl) = 3.71 g ÷ 36.46 g/mol.

n(HCl) = 0.102 mol; amount of hydrochloric acid.

From chemical reaction: n(Mg(OH)₂) : n(MgCl₂) = 1 : 1.

n(MgCl₂) =0.032 mol; amount of magnesium chloride.

m(MgCl₂) = n(MgCl₂) · M(MgCl₂).

m(MgCl₂) = 0.032 mol · 95.21 g/mol.

m(MgCl₂) = 3.05 g; mass of magnesium chloride.

3) The answer is: mass of potassium hydroxide is 8.1 grams.

Balanced chemical reaction: K₂O + H₂O → 2KOH.

m(K₂O) = 8.2 g; mass of potassium oxide.

n(K₂O) = m(K₂O) ÷ M(K₂O).

n(K₂O) = 8.2 g ÷ 94.2 g/mol.

n(K₂O) = 0.087 mol; amount of potassium oxide.

m(H₂O) = 1.3 g; mass of water.

n(H₂O) = 1.3 g ÷ 18 g/mol.

n(H₂O) = 0.072 mol; limiting reactant.

From chemical reaction: n(H₂O) : n(KOH) = 1 : 2.

n(KOH) = 2 · 0.072 mol.

n(KOH) = 0.144 mol.

m(KOH) = 0.144 mol · 56.1 g/mol.

m(KOH) = 8.1 g; mass of potassium hydroxide.

4) The answer is: mass of aluminum chloride is 16.66 grams.

Balanced chemical reaction: 2Al + 3Cl₂ → 2AlCl₃.

m(Al) = 8.1 g; mass of aluminium.

n(Al) = m(Al) ÷ M(Al).

n(Al) = 8.1 g ÷ 27 g/mol.

n(Al) = 0.3 mol.

V(Cl₂) = 4.2 L; volume of chlorine.

n(Cl₂) = 4.2 L ÷ 22.4 L/mol.

n(Cl₂) = 0.1875 mol; limiting reactant.

From chemical reaction: n(Cl₂) : n(AlCl₃) = 3 : 2.

n(AlCl₃) = 2 · 0.1875 mol ÷ 3.

n(AlCl₃) = 0.125 mol; amount of aluminium chloride.

m(AlCl₃) = 0.125 mol · 133.34 g/mol.

m(AlCl₃) = 16.66 g; mass of aluminium chloride.

Severe shock occurs when blood loss of
30,20,50,10,5%

Answers

The answer to your question is over 30%

How many moles of copper are needed to react with sulfur to produce 0.25 moles of copper (I) sulfide

Answers

copper  react  with  sulfur  to   produce   copper  (1)   sulfide  according  to  the  following   equation
 2Cu  +  S ---->  CU2S
from  the  equation  above  2   moles  of  copper  react   with  1  mole  of  Sulfur  to  produce  1  mole  of  copper  (1) sulfide

therefore  the  mole  ratio of  Cu  to  CU2S  is  2:1  therefore  the  moles of  copper  is   0.25  x   2=  0.5 moles

Is hot coffee an element a compound a heterogeneous mixture or a homogeneous mixture?

Answers

Final answer:

Hot coffee is a homogeneous mixture, consisting of substances that are uniformly distributed and cannot be easily separated.

Explanation:

Hot coffee is neither an element nor a compound, but rather a type of mixture. Specifically, hot coffee is a homogeneous mixture. A mixture is a material composed of two or more substances that are combined without a chemical reaction occurring, and in a homogeneous mixture, these substances are uniformly distributed. Therefore, in the case of hot coffee, the coffee solids, water, and any added sugar or cream are thoroughly mixed and cannot be easily separated, which is typical of homogeneous mixtures.

Learn more about Homogeneous Mixture here:

https://brainly.com/question/32534073

#SPJ6

Final answer:

Hot coffee is a homogeneous mixture, characterized by a uniform composition throughout. It is not a heterogeneous mixture or a compound.

Explanation:

Hot coffee is an example of a homogeneous mixture. This classification is due to the uniform composition throughout the coffee, which is a combination of several substances including water, coffee solids, and possibly sugar or milk. It remains homogeneous due to the heat which keeps the solids dissolved. It differs from a heterogeneous mixture, where the composition varies from point to point, and also from a compound, which is a substance formed by chemical union of two or more elements. In contrast, the constituents of a mixture like coffee can be separated by physical changes, such as evaporation.

Learn more about Homogeneous Mixture here:

https://brainly.com/question/30587533

#SPJ6

How is most carbon dioxide transported from tissues to the lungs? view available hint(s) how is most carbon dioxide transported from tissues to the lungs? as carbonic acid. as carbon dioxide gas. as bicarbonate ions (hco3−). as protons (h+)?

Answers

Most carbon dioxide is transported from tissues to the lungs  as a bicarbonate ions(HCO3-) in the plasma. Carbon dioxide is transported in the blood from the tissues to the lungs in three different ways. some of it is transported dissolved in the plasma, some is transported as carbaminohemoglobin and other as bound to proteins. However most carbon dioxide is transported as bicarbonate; as blood flows through the tissues, carbon dioxide diffuses into red blood cells, where it is converted into bicarbonate.

Sirius is a blue-white star with a surface temperature of about 9800 K. What is most likely the mass of Sirius? 1.0 solar mass 1.4 solar mass 2.0 solar mass 12 solar mass

Answers

1.4 solar mass should be the answer.

The answer is actually 2.0 solar masses.

The solubility of a gas in a liquid is _____. proportional to the square root of the pressure of the gas above the liquid unrelated to the pressure of the gas above the liquid inversely proportional to the pressure of the gas above the liquid directly proportional to the pressure of the gas above the liquid

Answers

Answer:

directly proportional to the pressure of the gas above the liquid

Explanation:

Henry’s law,

Sg = k Pg

where Sg, k and Pg are solubility of the gas, Henry’s constant and partial pressure of the gas respectively.  

According to Henry’s law the amount of gas that can dissolve in a liquid is directly proportional to the partial pressure of the gas above the liquid.  

elements can be broken down through ______ processes.

Answers

nuclear processes only - not chemical
Chemical and Nuclear processes i'm pretty sure 

How many molecules (not moles) of nh3 are produced from 5.81×10−4 g of h2? express your answer numerically as the number of molecules?

Answers

the reaction of formation of NH₃ is as follows;
N₂ + 3H₂ ---> 2NH₃
the stoichiometry of H₂ to NH₃ is 3:2
for every 3 moles of H₂ that reacts, 2 moles of NH₃ are produced 
the mass of H₂ that has been used up = 5.81 x 10⁻⁴ g 
molar mass of H₂ = 2 g/mol
number of H₂ moles that were used up = 5.81 x 10⁻⁴ g/ 2 g/mol
                                                              = 2.905 x 10⁻⁴ mol
for every 3 mol of H₂ used up - 2 moles of NH₃
for every 1 mol of H₂ used up - 2/3 moles of NH₃
therefore for 2.905 x 10⁻⁴ mol of H₂ = 2/3 x 2.905 x 10⁻⁴ mol 
number of NH₃ moles produced = 1.94 x 10⁻⁴ mol
number of NH₃ molecules in 1 mole = 6.022 x 10²³ molecules 
therefore in 1.94 x 10⁻⁴ mol  = 6.022 x 10²³ molecules/mole x 1.94 x 10⁻⁴ mol

therefore number of NH₃ molecules produced = 1.168 x 10²⁰ NH₃ molecules  

The diagram shows Niels Bohr’s model of an atom.


What happens when the electron moves from the first energy level to the second energy level?
Energy is absorbed, and an emission line is produced.
Energy is released, and an emission line is produced.[wrong]
Energy is absorbed by the atom.
Energy is lost from the atom.

Answers

when the electrons are jumped from low to high energy level, energy is absorbed making them able to jump to a higher state. it cant be emission line produce because that's when energy is released but in this case, it's being absorbed. I would go with "energy is absorbed by the atom"

Answer: When the electron moves from the first energy level to the second energy level, energy is absorbed.

Explanation:

When an electron moves from first energy level to the second energy level,energy is being absorbed by the atom which means that the electron jumps from lower energy level to higher energy level.

Bohr's Equation

E=[tex]\frac{-E_0}{n^2}[/tex]

where,

E= energy of an  electron in 'n' level (n=1,2,3...etc)

[tex]E_0[/tex]= energy of an electron in ground state.

as we can see from this equation energy is inversely proportional to the n principle quantum number which means that there will be decrease in energy. As the energy is decreasing in magnitude with the negative sign  which actually means there is increase in energy.

He balanced equation for the reaction of acetylene, c2h2, and oxygen in an acetylene torch is 2 c2h2 + 5 o2 → 4 co2 + 2 h2o. in this reaction the number of grams of oxygen required to react with 0.13 g of acetylene is ________.

Answers

Answer: 0.4 g

Explanation:

1) Balanced chemical equation:

2) 2C2H2 + 5 O2 → 4CO2 + 2 H2O

3) mole ratios:

2 mol C2h2 : 5 mol O2

4) Convert 0.13 g C2H2 into number of moles

n = mass in grams / molar mass

molar mass C2H2 = 2 *12g/mol + 2*1 g/mol = 26 g/mol

n = 0.13 g / 26 g/mol = 0.005 mol

5) Set the proportion with the unknown

5 mol O2             x
----------------- = ---------------
2 mol C2H2      0.005 mol C2H2

x = 0.005 mol C2H2 * 5 mol O2 / 2 mol C2H2 = 0.0125 mol O2

6) Convert 0.0125 mol O2 to grams

mass = number of moles * molar mass

molar mass of O2 = 32 g/mol

mass = 0.0125 mol * 32 g/mol = 0.4 g

Answer: 0.4 g

To react with 0.13 g of acetylene, 0.399 grams of oxygen are needed based on the molar masses and the balanced chemical equation 2 C2H2 + 5 O2
ightarrow 4 CO2 + 2 H2O.

To find the number of grams of oxygen required to react with 0.13 g of acetylene, we need to use the balanced chemical equation for the reaction and the molar mass of acetylene (C2H2) and oxygen (O2). The balanced chemical equation is 2 C2H2 + 5 O2
ightarrow 4 CO2 + 2 H2O. First, we calculate the molar mass of acetylene, which is (2  imes 12.01 g/mol for carbon) + (2  imes 1.008 g/mol for hydrogen) = 26.04 g/mol. Next, we determine how many moles of acetylene 0.13 g corresponds to by using the molar mass:

moles of C2H2 = 0.13 g / 26.04 g/mol = 0.00499 mol

According to the balanced equation, 2 moles of C2H2 react with 5 moles of O2. Therefore, for 0.00499 moles of C2H2, the moles of O2 required are (0.00499 mol C2H2  imes 5 moles O2) / 2 moles C2H2 = 0.012475 moles O2.

The molar mass of O2 is (2  imes 16.00 g/mol) = 32.00 g/mol. Now, we'll convert moles of O2 to grams:

grams of O2 = 0.012475 moles  imes 32.00 g/mol = 0.399 grams of O2

Therefore, 0.399 grams of oxygen are required to react with 0.13 grams of acetylene.

MEDAL, please help me understand.
Which best describes the oxidizing agent in this reaction?
Cl2(aq) + 2Brmc003-1.jpg(aq) mc003-2.jpg 2Clmc003-3.jpg(aq) + Br2(aq)
Bromine (Br) is the oxidizing agent because it gains an electron.
Bromine (Br) is the oxidizing agent because it loses an electron.
Chlorine (Cl) is the oxidizing agent because it gains an electron.
Chlorine (Cl) is the oxidizing agent because it loses an electron.,

Answers

The equation is:
Cl₂(aq) + 2 Br⁻(aq) → 2 Cl⁻ (aq) + Br₂(aq)
Oxidation = Loss of electrons
Reduction = gaining of electrons
Oxidizing agent : gain electrons and reduced
Reducing agent : lose electrons and oxidized
For Cl₂ it converted to 2 Cl⁻ so it gains electrons (Reduced) so it oxidize Br⁻ so it considered as Oxidizing agent
So the correct answer is:
C. Chlorine (Cl) is the oxidizing agent because it gains an electron

Answer:

c

Explanation:

Which defines reaction mechanism in chemistry? the mixing of two or more liquids to form a solution the steps in a chemical reaction in which products result from reactants a process in which a product is changed from one physical form to another intermolecular forces that cause attraction or repulsion between nearby particles?

Answers

Answer is: the steps in a chemical reaction in which products result from reactants.
Reaction mechanism tries to describe in detail what is happening at each stage of an overall chemical reactions (the step by step sequence of elementary reactions, this step are not usually observable) and order in which molecules react.

Answer:

the answer is B : the steps in a chemical reaction in which products result from reactants

Explanation:

Other Questions
Nicole uses 3 cups of vinegar and her salad dressing recipe how much vinegar with Nicole used to make 3/4 of recipe The modern piano was originally called the "fortepiano" or "pianoforte" because of its A. baroque origins. B. ability to change dynamics. C. inventor's last name. D. plucked strings. Kathy is a repair technician for a phone company. each week, she receives a batch of phones that need repairs. the number of phones that she has left to fix at the end of each day can be estimated with the equation p=10823d, where ppp is the number of phones left and ddd is the number of days she has worked that week. what is the meaning of the value 108108108 in this equation? what is 83/4 as an mixed number Solve for x. Simplify completely.x^2-9=55 Hazel has an assortment of red, blue, and green balls. The number of red balls is the number of blue balls. The number of green balls is more than the number of blue balls. In total, she has balls.An equation created to find the number of blue balls will have? Could someone explain me question 9 thank you Patient presents with a suspicious lesion on her left arm. with the patient's permission the physician marked the area for excision. the margins and lesion measured a total of 0.9 cm. the wound measuring 1.2 cm was closed in layers using 4-0 monocryl and 5-0 prolene. pathology later reported the lesion to be a sebaceous cyst. what codes are reported? Choose the correct pronoun.I just found my favorite photo of my brother and (he, him).I think it's him but I'm not sure >. Lf cows produce more milk when fed wheat then the cows that were not fed wheat will produce less milk Why did people in the middle ages center their community around a lord? william jennings bryan believed strongly in and became an advocate of what populist party policy position Why is a small crescent of light often observed on the moon when it is exactly in the new phase? Can blind people see their dreams? 17) What event led to Truman's final decision to use the atomic bomb against Japan?A)Japanese attacks on nearby American shipsB)the Allies strength and number of victoriesC)Japan's dismissal of the Potsdam DeclarationD)the German surrender to Allied forces in Europe18) Which of these was a national political leader during World War II?A)Franz JosefB)Woodrow WilsonC)Winston ChurchillD)Paul von Hindenburg19) The Lend-Lease Act was an attempt by the United States toA)stay out of World War I.B)supply iron and oil to Japan.C)divide land acquired from the Mexican War.D)let England borrow weapons in the early 1940s.20) Which of these contributed to the Crash of 1929 and the Great Depression?A)stock market speculationB)the effects of World War IIC)success of the U.S. farm economyD)foreign boycotts of U.S. products Which of the following was not something Mohandas Gandhi wanted for the Indian people? A. freedom from Great Britain B. equal rights for women C. peace between religious groups D. migration to Africa and Australia Annabel went to the beach for the day and rented a surfboard. The surfboard rental was $7.00 per hour, plus a rental fee of $12.00 which equation could Annabel use to find the total cost (c) if renting a surfboard for x amount of hours? What command is used to locate all occurrences of the word "dog" in a document? Compare the evaporation of a contained liquid with that of an uncontained liquid. The honeymoon phase in abuse is __________.A.the reason most couples stay togetherB.when the couple starts fightingC.when the abuser physically attacks the victimD.the time when couples decide to split upPlease select the best answer from the choices provided.ABCD