Answer:
It may be required when respiratory distress or airway integrity cannot be achieved or maintained for any reason.
(B) This actively pushes air into the lungs and can keep the levels of oxygen and carbon dioxide in the
blood close to normal.
Explanation:
Predict what would happen inside the magnet if the magnet were to break in half
What is the atomic number of this atom?
Answer:
2?????
Explanation:
which of these describes the electrostatic force
a. particles of the same charge repel each other
b. particles of different masses repel each other
c. particles of opposite charge repel each other
d. particles without charge repel each other
Answer:
A
Explanation:
like charge repel, unlike attract
Answer:
A.
Explanation:
Particles of the same charge repel each other. E.g. + and + OR - and -.
The image below shows the surface of the Moon.
The circle-shaped pits on the surface of the Moon are usually caused by collisions with asteroids or comets and are known as _______.
A.
plains
B.
mountains
C.
dunes
D.
craters
State of Matter Chemistry TEST
The temperature of the water started rising only when:
Othere was steam coming off the water in the beaker.
Othere was only water in the beaker.
theres was ice mixed with the water in the beaker.
Answer:
Othere was steam coming off the water in the beaker.
Which of the following is an example of potential energy changing into kinetic energy?
A. A girl climbing up a hill
B. A fruit falling from a tree
C. A car stopping when the brake is applied
D. A child on a swing slowing down as she swings upwards
Answer
B. a fruit falling from a tree
Explanation:
Take, for example, an apple tree. ... The tree uses this energy to build leaves and branches and fruit. When an apple falls from the tree to the ground, its energy of position (stored as gravitational potential energy) is converted to kinetic energy, the energy of motion, as it falls.
How does wavelength differ in high and low frequency waves?
In high frequency waves, the wavelength is short and appears in many short bursts. Meanwhile, in a low frequency wave, the wavelength is longer since it takes it a longer period of time to occur/pass.
If you constructed graphs, what trends do they indicate in your data?
Answer:A linear pattern is a continuous decrease or increase in numbers over time. On a graph, this data appears as a straight line angled diagonally up or down (the angle may be steep or shallow). So the trend either can be upward or downward.
Explanation:
Graphs are the diagrammatic representation of the data. The constructed graph gives the upward or downward trends in the data over the respective trends.
What are the types of graphs?The graphs can be distinguished based on the type of data representation technique used.
The graphs can be line, pie, bar, etc. The data plotted in the graph shows the trends with the angle of the line and the slope. The increasing slope tends to interpret the increasing trend, and vice versa.
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How many grams are in 0.25 mol KNO3? The molar mass of KNO3 is 101 g/mol.
Answer: 25.3g
Explanation:
The number of moles in chemistry is connected to the Mass and Molar mass of a compond through the following formular;
Moles = Mass (g) / Molar Mass (g/mol)
0.25 mol = Mass (g) / 101 g/mol
Make 'Mass' the subject of the formular;
Mass = 0.25 mol x 101 g/mol
= 25.25 approx 25.3g
If 0.04625 mg. of Uranium-235 remains after 2.8 x 10^9 years, what was
the original mass of the sample of Uranium-235? The half-life of Uranium-235 is 7.0 x 10^8 years.
Answer: The original mass of the sample of Uranium-235 is 0.7308 mg
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for calculating rate constant
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]k=\frac{0.693}{7.0\times 10^8years}=0.099\times 10^{-8}years^{-1}[/tex]
b) for time of [tex]2.8\times 10^9[/tex] years
[tex]2.8\times 10^9=\frac{2.303}{0.099\times 10^{-8}}\log\frac{a}{0.04625}[/tex]
[tex]\log\frac{a}{0.04625}=1.2[/tex]
[tex]\frac{a}{0.04625}=15.8[/tex]
[tex]a=0.7308mg[/tex]
The original mass of the sample of Uranium-235 is 0.7308 mg
Which subscripts complete the chemical formula for the compound?
CaHb
Answer choices for a: 1,3,8
b:1,3,8
Question:
Which subscripts complete the chemical formula for the compound?
Answer:
A: 3
B: 8
Answer:
A) 3
B) 8
Explanation:
Which change increases the electric force between objects?
O
Two neutral objects are moved closer together.
Electrons are added to two negatively charged objects.
Two oppositely charged objects are moved farther apart.
The charge on two positively charged objects is reduced.
O
O
Answer:
Electrons are added to two negatively charged objects.
Explanation:
Two negatively charged objects repel each other.
If electrons are added to two already negatively charged objects, they wil become even more negatively charged, which increases the electric force between the objects.
The electric force between objects can be increased when electrons are added to two negatively charged objects. Therefore, option B is correct.
What is electric force?The electric force is the attraction or repulsion between electrically charged objects. The force is created by the presence of charged particles, such as electrons or protons. It is described by Coulomb's law.
Like charges repel each other, while opposite charges attract each other. The strength of the electric force depends on the amount of charge on the objects and the distance between them. The force increases as the amount of charge increases and as the distance between the objects decreases.
Electric force is a fundamental force in nature. It plays an important role in many physical phenomena, such as electricity and magnetism. Therefore, option B is correct.
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1.
What is light energy converted from in the bulb of a lamp?
electric energy
sound energy
heat energy
2.
Which is the best example of an object that converts electric energy to heat energy?
lamp
toaster
radio
3.
Which is evidence of electric energy converted to sound energy?
music heard from a radio
a song played on a piano
applause from an audience
Answer:
1.Electrical energy
2. Toaster
3. Music heard from a radio
A group of scientists develops a new fertilizer. Which branch of chemistry are they engaged in?
A.) Organic Chemistry
B.) Inorganic Chemistry
C.) Biochemistry
D.) Analytical Chemistry
Answer:
A. Organic Chemistry
Explanation:
Because Fertilizer is a organic Mixture
Answer:
A. Organic Chemistry
Explanation:
Calculate the pressure using the formula
P= 1.03 + Mass on
Syringe/ area of Top of Syringe
Pressure:
kg/cm2
Answer:is 1.08 kg
Explanation:
Just got it wrong and it gave me the answer
47.5atm is the total pressure. The force delivered perpendicularly to an object's surface per unit area across how that force is dispersed is known as pressure
What is pressure?The force delivered perpendicularly to an object's surface per unit area across how that force is dispersed is known as pressure (symbol: p / P).445 Gauge pressure, sometimes written as gauge pressure, is the pressure in relation to the surrounding air pressure.
Pressure is expressed using a variety of units. Some of these come from dividing a unit of force by a unit of area; for instance, the SI unit of stress, the pascal (Pa), is equal to one newton each square metre (N/m2), and the conventional unit of pressure used by both the imperial while US customary systems is the pound-force according square inch of surface (psi, symbol lbf/in2).
Volume of gas = 47.5ML
P x V=51.3
P x 47.5=51.3
P=47.5atm
Therefore, 47.5atm is the total pressure.
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What is the molarity of a sodium hydroxide solution if 24 mL of the solution
is titrated to the end point with 12 mL of 0.50M sulfuric acid? (Remember:
MaVa = MbVb)
•0.10M
•0.25M
•0.50M
•0.75M
Answer:
Option 3. 0.50M
Explanation:
Step 1 :
We'll begin by writing the balanced equation for the reaction. This is given below:
2NaOH + H2SO4 —> Na2SO4 + 2H2O
From the above equation, we obtained the following:
Mole ratio of the acid (nA) = 1
Mole ratio of the base (nB) = 2
Step 2:
Data obtained from the question. This includes the following:
Molarity of base (Mb) =?
Volume of base (Vb) = 24 mL
Volume of acid (Va) = 12 mL
Molarity of acid (Ma) = 0.50M
Step 3:
Determination of the molarity of the base.
The molarity of the base can be obtained by applying the following equation:
MaVa/MbVb = nA/nB
0.5 x 12/Mb x 24 = 1/2
Cross multiply to express in linear form
Mb x 24 = 0.5 x 12 x 2
Divide both side by 24
Mb = (0.5 x 12 x 2) /24
Mb = 0.5 M
Therefore, the molarity of NaOH is 0.5 M
An engineer is trying to produce as much hydrogen gas as the company can using the equipment they have.
The engineering obtained the following data from research.
Sodium + Sulfuric Acid
Sodium Sulfate + Hydrogen
Mass of Na (g)
Mass of H,SO. (g)
Mass of Na,so ()
Mass of H. (g)
1149.5
2450
3549.5
50
2299
4900
7099
100
3448.5
1
7350
10648.5
150
Beginning: (5 points)
Reacting 2299 g of sodium requires 4900 g of sulfuric acid, as seen in the data table. How many moles of each substance is
this? Show your work and/or explain the math that you used to arrive at this answer.
Developing: (5 points).
Based on the chemical equation, how much sulfuric acid, in grams, is consumed from the reaction of 1450 g of sodium
metal? Show your work and/or explain the math that you used to arrive at this answer.
Proficient: (6 points)
The equipment the engineer has can only hold a maximum of 1450 g of sodium before it is mixed with excess sulfuric acid
to carry out the reaction described above. How much hydrogen gas can be produced from the equipment they currently
have? Show your work and/or explain the math that you used to arrive at this answer.
Answer:
See explaination
Explanation:
Please kindly check attachment for the step by step solution of the given problem.
How much heat is required to raise the temperature of 179g of acetic acid, CH3COOH, from 250C to 82.70C?
Answer:
HEAT REQUIRED TO RAISE THE TEMPERATURE OF 179 ACETIC ACID FROM 25 °C TO 82.7°C IS 21 100j OR 21.1 kJ
Explanation:
Heat = mcΔT
m = 179 g
C = 2.043 J.g-1K-1
ΔT = ( 82.70 - 25 ) = 57.7°C
Heat = 179 * 2.043 * 57.7
Heat = 21, 100.72 J
Heat ≅ 21.1 kJ
At the extreme temperatures within the Sun, hydrogen forms plasma. Plasma forms when:
1. atoms join together in chemical reactions
2. protons and electrons fuse together
3. protons fuse together, releasing heat and light
4. atoms break down to form free protons and electrons
If you could please let me know which option would be the answer to the question, it would be great!
Answer:
What do you need help with
Explanation:
Plasma forms when atoms break down to form free protons and electrons (option 4)
What is plasma?Plasma is the fourth state of matter, after solids, liquids, and gases. It is characterized by the presence of a significant portion of charged particles in any combination of ions or electrons.
It is the most abundant form of ordinary matter in the universe, mostly in stars (including the Sun), but also dominating the rarefied intracluster medium and intergalactic medium. Plasma can be artificially generated by heating a neutral gas or subjecting it to a strong electromagnetic field.
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A reaction occurs when solid X is placed into solution Y. As a result, the temperature of the new solution increases by 3°C.
The temperature rises another 2°C when more of solid X is added to the solution. What does this indicate about the effect of
adding more solid?
It increased the number of molecular collisions.
It decreased the number of molecular collisions.
It decreased the space between the molecules and lowered the reaction rate.
It increased the space between the molecules and increased the reaction rate.
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5.
To inflate a weather balloon you must increase its volume from 0.58 L (nearly empty for a weather balloon) to a full volume
against an external pressure of 1 atm exactly. The process requires 22.632 kJ of work. What is the volume of the balloon?
(The original formula would be something around [deltaE = deltaH - PdeltaV])
Answer:
ANswers is simply
Explanation:
8.73kJ
Select the phrase that completes each statement.
Honey is
Grape juice is
Sand on the beach is
• A mixture of carbon dioxide and nitrogen
gases is
•
Rubbing alcohol is
Answer:
1) A mixture and a solution.
2) A mixture and a solution.
3) A mixture but not a solution.
4) A mixture and a solution.
5) A mixture and a solution.
Explanation:
Honey, grape juice, a mixture of carbon dioxide and nitrogen gases, and rubbing alcohol are homogeneous mixtures, while sand on the beach is a heterogeneous mixture.
To complete the statements accurately, let's classify each substance:
Honey is a homogeneous mixture (solution) - It is a uniform mixture of water, sugars, and other compounds.
Grape juice is a homogeneous mixture (solution) - It contains water, sugars, acids, and other dissolved compounds that appear uniform throughout.
Sand on the beach is a heterogeneous mixture - It consists of different particles such as quartz, shells, and organic matter that are not uniform throughout.
A mixture of carbon dioxide and nitrogen gases is a homogeneous mixture (solution) - It forms a uniform gaseous mixture.
Rubbing alcohol is a homogeneous mixture (solution) - It is typically a mixture of isopropanol and water, appearing uniform throughout.
What is the rate of a reaction if the values are
k=0.1
a=1 M
b=2 M
rate=k(a)^2(b)^2
Answer:
Explanation:
Hi there,
To get started, let's first observe our rate law:
[tex]R=k[A]^2[B]^2[/tex] we typically use square brackets [x] for chemistry kinetics, because they specifically tell us we are dealing with concentrations.
This rate law is in fourth-order, because the concentrations powers add up to 4. We are not told the unit of time for this prompt (unless you know it), so I just assumed the time unit to be "time."
To calculate the reaction rate, we simply plug in the concentration of A and B into the rate law. k is the rate constant and stays the same for an individual reaction.
[tex]R=(0.1 \ M^{-3}*time^{-1})[1 \ M]^2[2 \ M]^2=0.4 \ M/time[/tex]
Thus, the rate of reaction with those concentrations is 0.4 M/time.
Notice, the rate constant does in fact have units of it own. The unit for k can be calculated by knowing that:
Rate (R) must end up with units of concentration (M) per time. The concentrations raised to a power can be used to help solve for the units of k.If you liked this solution, leave it as Brainliest Answer and give a Rating!
The rate of reaction with those concentrations is 0.4 M/time.
What is the rate of a reaction?The reaction rate is said to be the decrease in the concentration of the reactant or the increase in the concentration of the product per unit of time. Reaction rate measures how fast the reactant is used up or how fast the product is formed.
For a given reaction like
[tex]Mg(s) + O_2(g)[/tex] → [tex]2MgO(aq)[/tex]
The reaction rate is derived by measuring how fast the concentration of Mg and [tex]O_2[/tex] decreases or how fast the concentration of MgO increases. Mathematically reaction rate can be expressed as
Reaction rate = Δconcentration/ ΔTime
Rate=[tex]k(a)^2(b)^2[/tex] We typically use square brackets [x] for chemistry kinetics, because they specifically tell us we are dealing with concentrations.
This rate law is in fourth-order because the concentration powers add up to 4. We are not told the unit of time for this prompt (unless you know it), so I just assumed the time unit to be "time."
To calculate the reaction rate, we simply plug the concentration of A and B into the rate law. k is the rate constant and stays the same for an individual reaction.
Thus, the rate of reaction with those concentrations is 0.4 M/time.
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1.
Which phenomenon is responsible for sending electrically charged particles out into space?
prominences
sunspots
solar wind
O solar eclipses
w
Answer:
solar wind
Explanation:
pls pls pls give me brainiesttt tyty
good luck :)
The sugar deoxyribose is an important component of DNA. Deoxyribose is 44.8% 7.5% H, and 47.7% O by mass. What is the empirical formula for deoxyribose?
Answer:
C₅H₁₀O₄
Explanation:
The empirical formula is the simplest whole-number ratio of atoms in a compound.
The ratio of atoms is the same as the ratio of moles.
So, our job is to calculate the molar ratio of C:H:O.
Assume 100 g of deoxyribose.
1. Calculate the mass of each element.
Then we have 44.8 g C, 7.5 g H, and 47.7 g O.
2. Calculate the moles of each element
[tex]\text{Moles of C} = \text{44.8 g C} \times \dfrac{\text{1 mol C}}{\text{12.01 g C}} = \text{3.730 mol C}\\\\\text{Moles of H} = \text{7.5 g H} \times \dfrac{\text{1 mol H}}{\text{1.008 g H }} = \text{7.44 mol H}\\\\\text{Moles of O} = \text{47.7 g O} \times \dfrac{\text{1 mol O}}{\text{16.00 g O }} = \text{2.981 mol O}[/tex]
3. Calculate the molar ratio of the elements
Divide each number by the smallest number of moles
C:H:O = 3.730:7.44:2.981 = 1.251:2.50:1 = 5.005:9.98:4 ≈ 5:10:4
4. Write the empirical formula
EF = C₅H₁₀O₄
As the peppered moth evolved over time, its wings changed from light to dark so that it could better A) find food to eat. B) combat pollution. C) hide from predators. D) withstand its climate.
Answer:
C) Hide from predators
Explanation:
The smoke would allow the peppered moths to be more visible
Therefore, they evolved into dark-peppered moths to be able to hide from those predators.
When human prevent waste or loss it is known as
Answer:
im not sure exactly what terms this question is in but recycling?
According to Boyle's law, how would you reduce the volume of a gas?
a. by decreasing its pressure
b. by increasing its temperature
c. by decreasing its temperature
d. by increasing its pressure
Answer:
by increasing pressure
Explanation:
volume is inversely proportional to pressure at constant temperature
Answer:
d. Increasing the pressure.
Explanation:
Boyle's law state that P* V is constant at a given temperature.
So to reduce the volume you would increase the pressure.
The reaction in which two amino acids form a dipeptide and a water molecule is called a _____ reaction. condensation
hydration
Answer:
Condensation Reaction
Explanation:
bruh i dont have a question what up ?
Answer:
?
Explanation:
Answer : the sky (teehee)