Chemistry » Page 18

Chemistry

Yandel Oliver

What would you measure a cooking pot by

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Chemistry

Isaiah Rangel

Is pancakes cooking on a griddle a physical or chemical change?

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Chemistry

Chain

To determine whether a shiny gold-colored rock is actually gold, a chemistry student decides to measure its heat capacity. She first weighs the rock and finds that it has a mass of 4.7 g. She then finds that, upon absorption of 52.7 J of heat, the rock undergoes a rise in temperature from 25 ∘C to 57 ∘C. Find the specific heat capacity of the substance comprising the rock.

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Chemistry

Yesenia Parker

In most Acid-base reactions, what type of bond (ionic or covalent) is formed between the ions of the "salt"?

What happens to the electrons in this sort of bond? Are they transferred, or shared?

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Chemistry

Silas

Many trials are not needed before a hypothesis can be accepted

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Chemistry

Hudson

Consider the following reaction where Kp = 4.55*10-5 at 723 K:

N2 (g) + 3H2 (g) ⇋ 2NH3 (g)

a) If the three gases are mixed in a rigid container at 723 K so that the partial pressure of each gas is initially one atm, what will happen?

b) Indicate True (T) or False (F) for each of the following:

1. A reaction will occur in which NH3 (g) is consumed.

2. Kp will increase.

3. A reaction will occur in which N2 is produced.

4. Q is less than K.

5. The reaction is at equilibrium. No further reaction will occur.

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Chemistry

Oliver Browning

Rob measures the solubility of three different salts in water at 22°C. Which type of graph should he use to display his data? bar graph line graph histogram scatterplot

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Chemistry

Victoria Hicks

Consider the reaction below. The initial concentrations of PCl3 and Cl2 are each 0.0571 M, and the initial concentration of PCl5 is 0 M. If the equilibrium constant is Kc=0.021 under certain conditions, what is the equilibrium concentration (in molarity) of Cl2? PCl5 (g) ↽--⇀PCl3 (g) + Cl2 (g) Remember to use correct significant figures in your answer (round your answer to the nearest thousandth). Do not include units in your response.

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Chemistry

Sheldon Harris

How many grams of carbon dioxide are in 11 moles of it?

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Chemistry

Brenda Bond

A scientist heats a flexible container full of neon gas. What will most likely happen to the container as the gas absorbs heat?

It will shrink, because the neon atoms will break apart into smaller pieces.

It will expand, because the neon atoms will get larger.

It will expand, because the neon atoms will move more quickly and get farther apart.

It will shrink, because the neon atoms will lose energy as heat, and move closer together.

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Chemistry

Karla Farley

Name two alternative for solar power

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Chemistry

Bridget Chaney

In an oxidation-reduction reaction, what happens to the electrons in the reduction process?

A.

Electrons are bonded.

B.

Electrons are gained.

OC. Electrons are lost.

D.

Electrons are replaced.

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Chemistry

Genius

Describe the energy in nuclear fuel and the way in which it's converted to electrical energy.

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Chemistry

Sariah Alvarez

What is the concentration of O2 (g), in parts per million, in a solution that contains 0.008 gram of O2 (g) dissolved in 1000. grams of H2O (l) ?

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Chemistry

Brenda Marsh

Give the mass percent of carbon in C14H19NO2?

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