Chemical Reactions Unit Test

The formula for a molecule of serotonin is show below.

C₁₀H₁₂N₂O

How many atoms in all are in the molecule of serotonin?

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NGSS.MS-PS1-1

Sulfur hexafluoride, SF₆ is a very stable, nonflammable gas at room temperature. It is used in many electronic products because it is a good electrical insulator.

Which statement describes the composition of sulfur hexafluoride?

• It is a compound containing of atoms of sulfur and fluorine

• It is a compound that contains seven identical atoms

• It is an element with sulfur in the atom's nucleus and fluorine outside the nucleus

• It is an organic compound composed of long chains of sulfur atoms surrounded by fluorine atoms

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NGSS.MS-PS1-1

A chemist added by hydrochloric acid to a sample of baking soda in a beaker. Immediately, the mixture of the two chemicals began to fizz and bubble. Which of the following observations about the fizzing mixture provides evidence of a chemical reaction?

• The temperature of the beaker did not change.

• A substance escaped from the beaker in the form of a gas.

• Most of the baking soda appeared to dissolve in the acid.

• Some of the baking soda remained in the bottom of the beaker.

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NGSS.MS-PS1-2

Samara put a quantity of sulfur, a yellow powder, into a test tube. She gently heated the tube and observed that the powder turned black. What happened?

• The sulfur underwent a physical change called melting.

• The sulfur underwent a chemical change called burning.

• The sulfur underwent a chemical change called melting.

• The sulfur underwent a physical change called burning.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Annelise conducted an experiment by applying heat to aluminum, paper, water and wax. The results to her experiment are shown in the table above.

Which substance went through a chemical reaction?

• water

• aluminum

• wax

• paper

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Iron fillings are added to copper sulfate solution. Use the diagram to answer any questions that follow.

Which of the following does NOT indicate that a chemical reaction occurred when the iron fillings were added to the copper sulfate.

• The final solution formed bubbles.

• The volume of the solution increased.

• The color of the solution changed.

• The temperature increased.

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NGSS.MS-PS1-2

Does the following chemical equation follow the Law of Conservation of Mass?

2H₂ + O₂ = 2H₂O

• yes

• no

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NGSS.MS-PS1-5

Ammonium phosphate, a chemical common in many fertilizers, have the following formulas:

(NH₄)₃PO₄

How many hydrogen atoms are found in the most basic unit of ammonium phosphate?

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NGSS.MS-PS1-1

A chemical reaction in which calcium carbonate, CaCO₃, is decomposed results in the production of two simpler compounds.

CaO (? g) + CO₂ (21.97 g) ₌ CaCO₃ (28.00 g)

What is the mass of calcium oxide if it follows the Law of Conservation of Mass?

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

The equation below represents a chemical reaction in living cells.

C₆H₁₂O₆ + 6O₂ = 6CO₂ + 6H₂O + energy

How many atoms are represented in the reactants of this equation?

• 6

• 12

• 24

• 36

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NGSS.MS-PS1-1

NGSS.MS-PS1-5