MULTIPLE CHOICE

The substances that undergo change in a chemical reaction are called

• reactants.

• products.

• coefficients.

• elements.

Tags

NGSS.MS-PS1-5

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

Which of the following does NOT state what the arrow means in a chemical equation?

• forms

• produces

• conserves

• yields

Which of the following is a balanced chemical equation for the synthesis of NaBr from Na and Br2?

• Na + Br2 → NaBr

• 2Na + Br2 → NaBr

• Na + Br2 → 2NaBr

• 2Na + Br2 → 2NaBr

Tags

NGSS.MS-PS1-5

Methane, CH4, burns in oxygen gas to form water and carbon dioxide. What is the correct balanced chemical equation for this reaction?

• CH4 + O → H2O + CO2

• CH4 + O2 → 2H2O + CO2

• CH4 + CO2 → H2O + CO2

• CH4 + 2O2 → 2H2O + CO2

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Beryllium, Be, and chlorine, Cl, form a binary ionic compound with a one-to-two ratio of beryllium ions to chloride ions. The formula for the compound is

• Be2Cl.

• 2BeCl.

• BeCl2.

• Be2Cl2.

Tags

NGSS.MS-PS1-1

The name iron (II) indicates that a compound contains

• iron ions with an 11+ charge.

• iron ions with a 2+ charge.

• iron ions with a negative charge.

• two types of iron ions.

When magnesium carbonate, MgCO3, 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

• decomposition and single replacement

• double replacement and decomposition

• synthesis and single replacement

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

• One product is formed.

• There is only one reactant.

• The general formula is A + B → C.

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

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which of the following takes place during a redox reaction?

• Electrons are gained only.

• Electrons are lost only.

• Electrons are both gained and lost.

• Electrons are neither gained nor lost.