Physical Ch 7 Practice

During a chemistry experiment, Dejuan and Nataly mixed two substances together. One of the substances underwent a change in the chemical reaction. This substance is called

• a. a product.

• b. a chemical.

• c. a reactant.

• d. an enzyme.

Tags

NGSS.MS-PS1-2

In a chemistry class, Julio and Katie are performing an experiment. They mix two compounds together and observe a synthesis reaction. This means that:

• a. one of the compounds breaks down into at least two products.

• b. a compound is decomposed by an electric current.

• c. a compound burns in the presence of oxygen.

• d. a new, more complex compound is formed.

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NGSS.MS-PS1-1

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During a chemistry experiment, Katie and Julio combined sodium and chlorine gas. What was the product of their synthesis reaction?

• a. polyethylene.

• b. carbon dioxide.

• c. sodium chloride.

• d. copper(II) chloride.

Tags

NGSS.HS-PS1-1

Markel and Harvey are trying to balance a chemical equation for their chemistry class. They need to change or add which of the following to balance the equation?

• a. chemical symbols.

• b. subscripts.

• c. coefficients.

• d. reactants.

Za'kyrian and Harvey are conducting a chemistry experiment. They have 2H2O -->2H2+O2. How many moles of hydrogen gas are produced in this reaction?

• a. 1 mol

• b. 2 mol

• c. 3 mol

• d. 4 mol

Tags

NGSS.HS-PS1-7

Za'kyrian and Nataly are working on a chemistry project where they need to react hydrogen sulfide (H2S) with oxygen (O2) to produce sulfuric acid (H2SO4). If they have 1 mole of H2S, how many moles of O2 will they need to complete the reaction?

• a. 1 mol

• b. 2 mol

• c. 3 mol

• d. 4 mol

Dejuan and Ashton are conducting a chemistry experiment. They observe that in a balanced chemical reaction, the total mass of the products always equals the

• a. molar mass of the reactants.

• b. atomic mass of the reactants.

• c. total mass of the reactants.

• d. proportional masses of the reactants.

Tags

NGSS.HS-PS1-7

Markel and Julio are conducting a chemistry experiment. They observe that a chemical reaction and its reverse are occurring at the same time and at the same rate. What has the reaction achieved?

• a. displacement.

• b. equilibrium.

• c. imbalance.

• d. decomposition.

Tags

NGSS.HS-PS1-6

Za'kyrian is conducting an experiment to understand the effect of temperature on a reaction. According to Le Châtelier's principle, increasing the temperature will favor a reaction that:

• a. releases energy as heat.

• b. absorbs energy as heat.

• c. involves a chemical catalyst.

• d. involves an enzyme.

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NGSS.HS-PS1-4

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A change of color is a sign that a(n) _______________________ is taking place.

• Chemical reaction

• reactant

• color change

• new chemical was added.

Tags

NGSS.MS-PS1-2