Physical Science Ch. 7

The substances that are formed as a result of a chemical reaction are called

• coefficients.

• reactants.

• products.

• elements.

Hydrochloric acid, HCl, is added to solid NaOH. After the reaction is complete, NaCl dissolved in water remains. What are the products of this chemical reaction?

• NaOH and HCl

• NaOH and H₂O

• HCl and NaCl

• NaCl and H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Select more than one answer: What does the arrow mean in a chemical equation?

• forms

• produces

• conserves

• yields

Which of the following is a balanced chemical equation for the synthesis of H₂O from H₂ and O₂?

• H₂ + O₂ --> H₂O

• 2H₂ + O₂ --> H₂O

• 2H₂ + O₂ --> 2H₂O

• H₂ + O₂ --> 2H₂O

Tags

NGSS.HS-PS1-7

The coefficients in a balanced chemical equation always can express the ratio of _____ of reactants and products.

• Moles

• Volume

• Atoms

• Mass

Tags

NGSS.HS-PS1-7

When magnesium carbonate, MgCO₂, reacts with nitric acid, HNO₃, magnesium nitrate and carbonic acid form. Carbonic acid then breaks down into water and carbon dioxide. Which two types of reactions take place in this process?

• synthesis and decomposition

• single replacement and combustion

• double replacement and decomposition

• double replacement and synthesis

Which of the following is NOT always true about a synthesis reaction?

• One product is formed.

• There is only one reactant.

• General formula is A + B --> C.

• A reactant might be a compound or it might be an element.

What takes place during a redox reaction?

• Electrons are gained only.

• Electrons are lost only.

• Electrons are both gained and lost.

• Electrons are neither gained or lost.

Tags

NGSS.HS-PS1-7

In a compound, chemical energy is contained in the

• nuclei of the atoms.

• unbonded. electrons.

• bonds.

• movement of the electrons.

Tags

NGSS.HS-PS1-4

Which is true about what happens during a chemical reaction?

• Bonds are broken in reactants and formed in products.

• Bonds are formed in reactants and broken in products.

• Bonds are broken in both reactants and products.

• Bonds are formed in both reactants and products.

Tags

NGSS.HS-PS1-7