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3 years ago

12 POINTS!!!! Consider the diagram. Which postulate of the kinetic-molecular theory best describes the event in the diagram?

Chemistry

2 answers:

podryga [215]3 years ago

8 0

The separation of molecules. I wouldn't put that if i were you.

dybincka [34]3 years ago

6 0

Answer:

there is no force of attraction or repulsion between gas particles

Explanation:

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In the reaction between formic acid (HCHO2) and sodium hydroxide, water and sodium formate (NaCHO2) are formed. To determine the

Gnom [1K]

Answer:

Balanced equation: HCHO₂ + NaOH → NaCHO₂ + H₂O

Heat of reaction: 22.6 kJ/mol

Explanation:

The chemical equation is the sum of the reactants given the products:

HCHO₂ + NaOH → NaCHO₂ + H₂O

To balance the equation, the elements must be in the same amount in the reactants and the products. As we can see, there are the same amount of elements on each side, so the equation is balanced.

The heat flows can be calculated by:

Q = m*cp*ΔT

Where m is the mass of the substances (mass of formic acid + mass of sodium hydroxide), cp is the specif heat, and ΔT is the variation at temperature (final - initial).

Mass is the density multiplied by the volume, so:

m = 1*75 + 1*45 = 120 g

Q = 120*4.18*(25.5 - 21.9)

Q = 1,805.76 J = 1.81 kJ

The number of moles of the reactants can be calculated by the volume multipled by the concentration:

HCHO₂ = 0.075L * 1.07 mol/L = 0.08025 mol

NaOH = 0.045L * 1.78 mol/L = 0.0801 mol

So, NaOH is limiting (stoichiometry is 1:1, so it's necessary the same amount of the reactants), and the heat of the reaction will be calculated by it.

ΔH = Q/n

ΔH = 1.81/0.0801

ΔH = 22.6 kJ/mol

5 0

4 years ago

A sample of propane (C3H8) has a mass of 0. 47 g. The sample is burned in a bomb calorimeter that has a mass of 1. 350 kg and a

Nady [450]

The amount of heat released by the sample has been 22.54 kJ. Thus, option C is correct.

The specific heat has been defined as the amount of heat required to raise the temperature of 1 gram of substance by 1 degree Celsius.

The specific heat has been expressed as:

$q=mc\Delta T$

<h3 /><h3>Computation for the heat absorbed</h3>

The iron and calorimeter are in side the closed system. Thus, the energy released by the sample, has been equivalent to the energy absorbed by the calorimeter.

$q_{released}=q_{absorbed}\\
q_{released}=m_{calorimeter}\;c_{calorimeter}\;\Delta T$

The given mass of calorimeter has been, $m_{calorimeter}=1350\;\rm g$

The specific heat of the calorimeter has been, $c_{calorimeter}=5.82\;\rm J/g^\circ C$

The change in temperature of the calorimeter has been, $\Delta T=2.87^\circ \rm C$

Substituting the values for heat released:

$q_{released}= 1350\;\text g\;\times\;5.82\;\text J/\text g^\circ \text C\;\times\;2.87^\circ \text C\\
q_{released}=22,549.5\;\text J\\
q_{released}}=22.54\;\rm kJ$

The amount of heat released by the sample has been 22.54 kJ. Thus, option C is correct.

Learn more about specific heat, here:

brainly.com/question/2094845

6 0

3 years ago

What is this process of producing more offspring than possibly survive called?

tamaranim1 [39]

Darwin's Theory of Evolution by Natural Selection.

Darwin divided this theory into multiple parts but overall it fits into Darwin's Theory of Evolution by Natural Selection, so that would be your answer.

In case you're wondering about the others:

1. Organisms produce more offspring than actually survive.

2. Every organism must struggle to survive.

3. There is variation within a species.

4. Some variations allow members of a species to survive and reproduce better than others.

5. Organisms that survive and reproduce pass their traits to their offspring, and the helpful traits gradually appear in more and more of the population.

(these are brief explanations, they go into more detail)

Good luck!

4 0

3 years ago

Which group on the periodic table contains only metals? A. the second group B. Along the top C. Along the bottom D. The last gro

Mrac [35]

Good day sir, I believe it is C Have a great day!

8 0

3 years ago

Following a volcanic eruption, which event is usually the last one to be observed

emmainna [20.7K]

Answer: observing it

Explanation:

I got it right on test

4 0

3 years ago

Read 2 more answers