Chemistry » Page 35

Chemistry

Bryan Burke

Combining 0.380 mol Fe2O3 with excess carbon produced 13.7 g Fe

Fe2O3 + 3C → 2Fe + 3CO

What is the actual yield of iron in moles?

What is the theoretical yield of iron in moles?

What is the percent yield?

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Chemistry

Miya Hughes

When a hydrogen electron makes a transition from n=3 to n=1?

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Chemistry

Grant Hurley

If two electrons have same number of protons but different number of neutrons can they be atoms of the same element?

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Chemistry

Kamren Moss

A gas has a pressure of 0.370 atm at 50.0 °C. What is the pressure at 22 °C, assuming volume remains constant?

A.) 0.34 atm

B.) 0.58 atm

C.) 0.74 atm

D.) 0.98 atm

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Chemistry

Kristen Avery

Two chemical reactions are shown:

C + O2 → CO2

CO2 + H2O → H2CO3

Which statement is true?

Both are synthesis reactions.

Both are decomposition reactions.

A is a synthesis reaction, and B is a decomposition reaction.

A is a decomposition reaction, and B is a synthesis reaction.

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Chemistry

Shaun Daniels

After an experiment is complete and has been published, what process makes sure the results are reliable?

A. Falsifiability

B. Peer review

C. The conclusion

D. Error Bars

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Chemistry

Maia

Heat is released when H2 gas and O2 gas react to form H2O. Why?

A. Breaking the H-H bond in H2 gas releases heat.

B. Breaking the O-O bond in O2 gas releases heat.

C. Forming the H-O bonds in H2O releases heat.

D. Both A and B are responsible for heat being released in the reaction.

I guessed D

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Chemistry

Luka Shields

Which of the following shows a chemical reaction in which aluminum and hydrochloric acid are the reactants and aluminum chloride and hydrogen are the products? A. aluminum + aluminum chloride → hydrochloric acid + hydrogen B. hydrochloric acid + hydrogen → aluminum chloride + aluminum C. aluminum + hydrochloric acid → aluminum chloride + hydrogen D. aluminum chloride + hydrogen → aluminum + hydrochloric acid

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Chemistry

Genesis

In which ways do humans affect the environments of animals?

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Chemistry

Kyla Sutton

How do you set up a proper experiment

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Chemistry

Guest

Rubidium and cesium have similar chemical

properties because, in the ground state, the

atoms of both elements each have

(1) one electron in the outermost shell

(2) two electrons in the outermost shell

(3) one neutron in the nucleus

(4) two neutrons in the nucleus

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Chemistry

Destiny

Identify the major species in solution after the reaction of hydrochloric acid and sodium hydroxide.

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Chemistry

Eduardo Garner

What is the purpose of a buffer?

a. increase the pH of a solution

b. decrease the pH of a solution

c. resist changes in pH

d. procedure used to determine pH of solution

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Chemistry

Madyson Munoz

The concentration of a solution can be expressed in a number of ways. choose the solution expressions that are equal to a solution that contains 1 mg/ml solute.

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Chemistry

Koty

Which two terms below BOTH describe the igneous rock granite?

felsic and extrusive

ultramafic and intrusive

felsic and intrusive

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