Unit 5 Chemical Reactions Test

How many atoms of oxygen are represented in 2Pb(SO4)2?

• 2

• 4

• 8

• 16

Tags

NGSS.MS-PS1-1

A solid produced from two aqueous solutions in a chemical reaction is known as a(n) ____________.

• precipitate

• oxide

• salt

• hydrocarbon

Classify the following reaction: HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)

• Double replacement

• Single replacement

• Combustion

• Decomposition

Which of the following statements about the reaction below is not true? N2(g) + 3H2(g) ⇌ 2NH3(g) + energy

• A. It is endothermic.

• B. Overall, it releases energy.

• C. It is in equilibrium.

• D. It is reversible.

Tags

NGSS.HS-PS1-4

To balance a chemical equation, it may be necessary to change the substances’ ____________.

• subscripts

• superscripts

• coefficients

• formulas

Tags

NGSS.HS-PS1-7

Which of the following statements best describes the following reaction? MgCl2 + I2 → MgI2 + Cl2

• It is a double replacement reaction.

• It is a decomposition reaction.

• It is a synthesis reaction.

• The reaction will not occur.

Tags

NGSS.MS-PS1-2

Which of the following would not be considered evidence of a chemical reaction?

• Formation of a precipitate

• Production of a gas

• State of matter change

• Sudden release of light

Tags

NGSS.MS-PS1-2

Which of the following statements is true about chemical equilibrium?

• The reaction has reached its end.

• The forward and reverse reactions occur at the same rate.

• The concentration of reactants is higher than the concentration of products.

• The amount of reactants and products is the same.

Tags

NGSS.HS-PS1-6

In a chemical equation, “dissolved in water” is represented by which of the following symbols?

• (s)

• (l)

• (g)

• (aq)

Two students conduct several tests to determine the identity of an unknown metal. They noted that it was powdery white, conducted both heat and electricity, and had a density of 10.49 g/cm³. It did not react with water but, with nitric acid it released a gas. What evidence above supports a chemical change in this unknown?

• A. It conducts heat.

• B. It reacts with nitric acid to produce a gas.

• C. It has a density of 10.49 g/cm³.

• D. It is powdery white.

Tags

NGSS.MS-PS1-2