The Milky Way Galaxy is one of
in the known universe.
OA) hundreds
OB thousands
C) millions
D) billions

Answer:

1. Option(1) 3

2. Option (2) 1/2

Explanation:

1. We'll begin by obtaining the molar mass of H3PO4. This is illustrated below:

Molar Mass of H3PO4 = (3x1) + 31 + (16x4) = 3 + 31 + 64 = 98g/mol

Mass of H in H3PO4 = 3x1 = 3g

The percentage by mass of H in H3PO4 given by:

Mass of H in H3PO4/Molar Mass of H3PO4 x 100

=> 3/98 x 100

=> 3

2. Atoms present in H3PO4 are given below:

H = 3 atoms

P = 1 atom

O = 4 atoms

Total = 8 atoms

The fraction of oxygen atom in H3PO4 is given by:

=> Atom of O/total atoms

=> 4/8

=> 1/2

a, proton following identifies an element

The number of protons identifies an element. Therefore, option A is correct.

The atomic number is used to identify an element, and it is the number of protons in an element's nuclei. Every element has a distinct number of protons, and thus an atomic number.

Electron configuration, atomic size, ionization energy, electron affinity, and electronegativity are atomic properties that are critical to element behavior.

The atomic number is the number of protons in the nucleus of an atom. The number of protons defines the identity of an element.

The number of protons in an element is the only way to identify it; the number of neutrons and electrons can vary without changing the element's identity.

Thus, The number of protons identifies an element, option A is correct.

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Answer:

520.8 mL

Explanation:

We can solve this problem by using Boyle's Law, which states that:

"For a fixed mass of an ideal gas kept at constant temperature, the pressure of the gas is inversely proportional to its volume"

Mathematically:

[tex]p\propto \frac{1}{V}[/tex]

where

p is the pressure

V is the volume

We can rewrite the equation as

[tex]p_1 V_1 = p_2 V_2[/tex]

where here:

[tex]p_1=12.5 psi[/tex] is the initial pressure of the gas

[tex]V_1=750 mL[/tex] is the initial volume

[tex]p_2=18 psi[/tex] is the final pressure

And solving for V2, we find the final volume of the gas:

[tex]V_2=\frac{p_1 V_1}{p_2}=\frac{(12.5)(750)}{18}=520.8 mL[/tex]

Answer : The negative value indicate about the reaction is exothermic and heat is released.

Explanation :

Enthalpy of a reaction (ΔH): It is defined as the energy change that takes place during the chemical processes. It is represented as, ΔH.

If the heat is absorbed during the chemical process then the enthalpy of reaction is positive.

If the heat is released during the chemical process then the enthalpy of reaction is negative.

That means,

When the value of enthalpy of reaction is negative then the heat is released and the reaction will be exothermic reaction.

When the value of enthalpy of reaction is positive then the heat is absorbed and the reaction will be endothermic reaction.

Final answer:

A negative ∆H in calorimetry signifies an exothermic reaction where heat is released by the system to the surroundings.

Explanation:

A negative ∆H in a calorimetry investigation indicates that the reaction is exothermic, meaning heat is released by the system to the surroundings.

For example, if the enthalpy change is negative in the combustion of methane, it signifies that heat is being given off by the system.

In calorimetry, negative ∆H values represent energy being transferred from the system to its surroundings in exothermic reactions.

Answer:

Endergonic reactions

Explanation:

The terms endergonic and exergonic describe reactions in terms of the energy transfer. Because ender = in, exo = out, we can tell that endergonic reactions need energy put in, and exergonic don't need energy put in, they release energy!

Answer: 0.37 m/s

Explanation:

Given that:

Velocity of object = ?

Mass of object = 17.6 kg

kinetic energy of object = 1.19 J

Since kinetic energy is the energy possessed by a moving object, and it depends on the mass of the object and its velocity, apply the formula

K.E = 1/2 x mass x velocity^2

1.19J = 1/2 x 17.6kg x velocity^2

1.19J = 8.8kg x velocity^2

velocity^2 = 1.19J / 8.8kg

velocity^2 = 0.135

To get the value of velocity, find the square root of 0.135

velocity = √0.135

Velocity = 0.367 m/s (Rounded to the nearest hundredth as 0.37m/s)

Thus, the velocity is 0.37 m/s

Answer: 401.4g

Explanation:

The mass can be calculated by using the following mathematical expression for Moles ,which is:

Moles = Mass / Molar Mass

From the question given, Moles = 1.72, Molar mass of BaSO4 = 233.38g/mol, Mass =?

Making 'Mass' the subject of formula, we get:

Mass = Molar mass x Moles

= 233.38 x 1.72 = 401.4g

Answer:

True!

Explanation:

Explanation:

This calculator will find the missing variable in the physics equation for force (F = M * a), when two of the variables are known.

Force is measured in newtons (N)

Force = mass × acceleration

Mass is in kilograms (kg) and acceleration in meters per second squared (m/s2).

Answer:

Q = 25.6 j

Explanation:

Given data:

Energy needed= ?

Mass of lead = 10.0 g

Initial temperature = 30 °C

Final temperature = 50°C

Cp = 0.128 j/g.°C

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 50°C - 30°C

ΔT = 20°C

Now we will put the values in formula.

Q = 10 g × 0.128 j/g.°C × 20°C

Q = 25.6 j

Answer:

2000

Explanation:

it is verified by scientists

3440 kJ is the energy that is required to vaporize 2 kg of aluminum. The elemental source of energy upon earth is said to be the sun.

On earth, energy comes in a variety of ways. The elemental source of energy upon earth is said to be the sun. Energy is seen as a quantifiable property in physics that may be transferred form an item to carry out work. Thus, we might characterise energy as the capacity to engage in any sort of physical action. So, to put it simply, we may describe energy as:

The capacity to perform work is energy. Energy "can neither be created neither destroyed but must instead be converted forms one form to another," according to the rules of conservation of energy. The SI unit for energy is called a joule.

Q = m× Lvapor

    =m×293.4 kJ/mol

    =3440 kJ

Therefore, 3440 kJ is the energy that is required to vaporize 2 kg of aluminum.

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Answer:

Boyle's Law

Explanation:

It's Boyle's law because, for a fixed mass of a perfect gas remaining at a fixed temperature ,pressure and volume are inversely correspondent . Boyle's law is a gas law, that states that  pressure and volume of a gas has an inverse relationship . So, if the volume of the gas increases then,the pressure will decrease and vice versa , when temperature is held constant.

The volume of a gas is dependent on:

1. Pressure

2. Temperature

3. Amount of gas.

Final answer:

In Chemistry, significant figures represent precision in measurements. The number of significant figures varies for each measurement based on the rules of counting significant figures, considering zeros as either placekeepers or significant values.

Explanation:

The subject of this question is Chemistry, particularly focusing on significant figures which are crucial for representing precision in measurements. Let's determine the number of significant figures in each given measurement using the rules for counting significant figures:

0.0908 has three significant figures (leading zeros are not significant).

340.02 has five significant figures (zeros between non-zero digits are significant).

5420 has three significant figures, assuming the last zero is not significant unless otherwise stated (if in scientific notation, it would clarify).

12.90 has four significant figures (trailing zeros in a decimal are significant).

3.09 x 10^8 has three significant figures (all digits in the coefficient are significant).

0.79 has two significant figures (leading zeros are not significant).

0.02050 has four significant figures (trailing zeros in a decimal number are significant).

0.009 has one significant figure (leading zeros are not significant).

4709 has four significant figures (all non-zero digits are significant).

Answer:

v=2010 inches^3

Explanation:

The volume of a cylinder can be found using:

[tex]v=\pi r^2h[/tex]

We know the height is 10, the radius is 8, and we can substitute 3.14 in for pi

v=3.14(8^2)(10)

Solve the exponent first

v=3.14(64)(10)

v=3.14(640)

v=2009.6

To the nearest whole number:

v=2010 inches^3

The size of volumetric flask is 0.5L = 500mL

Explanation:

In order to estimate the concentration of a solution in molarity, then the total number of moles of the solute is divided by the total volume of the solution.

Molarity of a solution is given by;

[tex]M= \frac{n}{V}[/tex]

Where;

n= number of moles of solute

V= volume of solution = size of volumetric flask

[tex]n=\frac{m }{ m.m}[/tex]

Where;

m= mass of solute=43.85g

m.m= molar mass of solute=58.5g

Note that solute is NaCl(s)

[tex]n=\frac{43.85}{58.5}=0.75mol[/tex]

We know that the molarity is 1.50M

To find the size of the volumetric flask, we make V in M=n/V subject of formula

[tex]V=\frac{n}{M}[/tex]

[tex]V=\frac{0.75}{1.50}[/tex]

[tex]V=0.5[/tex]

Therefore, the size of volumetric flask is 0.5L = 500mL.

Final answer:

To prepare a 1.50 M NaCl solution using 43.85 g of NaCl, calculate the moles of NaCl and then divide by the desired molarity, resulting in a volume of 0.500 liters. Therefore, a 500 mL volumetric flask should be used.

Explanation:

To determine what size volumetric flask is needed to create a 1.50 M solution using 43.85 g of NaCl, we first need to calculate the amount of solvent required to achieve this molarity. The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol. To find the number of moles in 43.85 g of NaCl, we divide the mass by the molar mass:

moles of NaCl = 43.85 g / 58.44 g/mol = 0.750 moles

Next, we use the formula for molarity (M), which is moles of solute (n) divided by liters of solution (V). Since we want a 1.50 M solution:

1.50 M = 0.750 moles / V (liters)

Solving for V gives us:

V = 0.750 moles / 1.50 M = 0.500 liters

Thus, a 500 mL volumetric flask is appropriate to prepare this solution, ensuring the final volume accounts for the added volume after the solute has dissolved.

Answer:

Prokaryotic are unicellular organisms that lack organelles or other internal membrane-bound structures. Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleotide.

Explanation:

The percentage of water in the hydrated lithium nitrate is calculated by subtracting the mass of the dehydrated compound from the initial mass of the hydrated compound. The result is the mass of water, which is then divided by the initial mass of the hydrated compound and multiplied by 100 to give the percentage of water.

A chemist started with a hydrated lithium nitrate which weighed 170 grams. After heating it and driving off the water of hydration, the mass of the sample reduced to 95.3 grams. This mass reduction is due to the loss of water molecules.

The chemist found that the mass of water lost is 170 grams − 95.3 grams = 74.7 grams. Therefore, the percentage of water in the hydrate can be calculated by dividing the mass of the water lost by the initial mass of the hydrate and then multiplying by 100%.

Using this method, the percentage of water in the hydrated lithium nitrate can be calculated as: (74.7 grams/170 grams)*100% = 43.94%. Therefore, approximately 44% of the mass of the hydrated lithium nitrate is water.

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In the water cycle, the stage following evaporation is condensation. This process involves water transforming from a gas back into a liquid form in the atmosphere, eventually leading to precipitation.

In the water cycle, the stage that occurs after evaporation is condensation. After water evaporates from the earth's surface, it rises into the atmosphere where cooling temperatures cause it to change from a gas (steam) back into a liquid form, creating clouds.

This is the process of condensation. It's important to note that the water cycle is a continual process, and after condensation, the cycle usually moves on to precipitation, where the condensed water falls back to the earth as rain, sleet, or snow.

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The pOH of the solution is 8.

What is pOH?

pOH is a measure of the hydroxide ion concentration in a solution, reflecting its alkalinity. It is calculated as the negative logarithm of the hydroxide ion concentration. The pOH scale complements the pH scale, which measures the hydrogen ion concentration, and together they provide a comprehensive view of a solution's acid-base balance.

We know that;

pOH = - log[OH-]

pOH = -log[9.5 *[tex]10^{-9[/tex]]

pOH = 8

Answer:

its manganese

Explanation:

Manganese is in the middle of the period has the highest number of oxidation states because all other elements have at least two different oxidation states

Answer: hey its me btw the answer is The number of electrons the element needs to lose or gain to have a full valence shell

Explanation:

Answer:

CHAPTER 17

PROPERTIES OF SOLUTIONS

Solution Composition

12. Mass percent: the percent by mass of the solute in the solution.

Mole fraction: the ratio of the number of moles of a given component to the total number of

moles of solution.

Molarity: the number of moles of solute per liter of solution.

Molality: the number of moles of solute per kilogram of solvent.

Volume is temperature-dependent, whereas mass and the number of moles are not. Only

molarity has a volume term, so only molarity is temperature-dependent.

13. a. HNO3(l) → H+

(aq) + NO3

−

(aq) b. Na2SO4(s) → 2 Na+

(aq) + SO4

2−

(aq)

c. Al(NO3)3(s) → Al3+(aq) + 3 NO3

−

(aq) d. SrBr2(s) → Sr2+(aq) + 2 Br−

(aq)

e. KClO4(s) → K+

(aq) + ClO4

−

(aq) f. NH4Br(s) → NH4

+

(aq) + Br−

(aq)

g. NH4NO3(s) → NH4

+

(aq) + NO3

−

(aq) h. CuSO4(s) → Cu2+(aq) + SO4

2−

(aq)

i. NaOH(s) → Na+

(aq) + OH−

(aq)

14. Mol Na2CO3 = 0.0700 L ×

L

3.0 mol Na 2CO3 = 0.21 mol Na2CO3

Na2CO3(s) → 2 Na+

(aq) + CO3

2−

(aq); mol Na+

= 2(0.21) = 0.42 mol

Mol NaHCO3 = 0.0300 L ×

L

1.0 mol NaHCO3 = 0.030 mol NaHCO3

NaHCO3(s) → Na+

(aq) + HCO3

−

Answer:

34.8 L of hydrogen gas

Explanation:

Now we have to use the ideal gas equation;

PV= nRT

P= pressure of the gas= 3.22atm

V= volume of the gas = ?????

T= temperature of the gas = 45°C +273= 318K

n= number of moles =4.3 moles

R= universal gas constant= 0.082atm Lmol-1K-1

Making V the subject of the formula

V= nRT/P

V= 4.3×0.082×318/3.22

V= 34.8 L

Answer:

34.82 L

Explanation:

Step 1:

Data obtained from the question:

Number of mole (n) = 4.3 mole

Temperature (T) = 45°C = 45°C +273 = 318K

Pressure (P) = 3.22 atm

Volume (V) =?

Step 2:

Determination of the volume hydrogen gas.

With the application of the ideal gas equation, the volume of Hydrogen gas can be obtained as follow:

Note that the gas constant (R) = 0.082atm.L/Kmol

PV = nRT

3.22 x V = 4.3 x 0.082 x 318

Divide both side by 3.22

V = (4.3 x 0.082 x 318) /3.22

V = 34.82 L

Therefore the volume occupied by the hydrogen gas is 34.82 L

Answer:

1025.08

Explanation:

Answer:

1.025e+6 joules

Explanation:

Answer:

combination reaction

Explanation:

i'm not sure i just searched it on the internet

Answer:

Combination reaction

Explanation:

When sodium reacts with chlorine

It is known to be combination reaction because they will combine to give a specific compound

That is,Na+Cl=NaCl

And the bond formed between them is ionic bond

Answer:

A

Explanation:

Menthol (M 156.3 g/mol), the strong-smelling substance in many cough drops, is a compound of carbon, hydrogen, and oxygen. When 0.1595 g of menthol was bunted in a combustion apparatus. 0.449 g of CO_2 and 0.184 g of H_2 O formed.

Answer:

The answer is 3rd option.

Explanation:

Lipid is a liquid form of fat

Protein is not a sugar or starch solution.

Carbohydates is a large and complex molecules in a form of sugar.