Ch 9: Chemical Reactions

Which of the following observations could be an indication of a chemical reaction of antimony?

• It is a solid at room temperature.

• It melts at 631°C.

• It expands upon freezing.

• It burns in an atmosphere of chlorine.

The _________ symbol separates the reactants from the products and means "to yield".

A balanced chemical equation is a direct presentation of the ___________.

• law of conservation of momentum

• law of conservation of energy

• law of conservation of mass

• ideal gas law

Which of the following is the correct word equation for the chemical reaction shown below?

• Aqueous aluminum and bromine gas react to produce solid aluminum bromide.

• Solid aluminum and aqueous bromine react to produce solid aluminum bromide.

• Solid aluminum and bromine gas react to produce solid aluminum bromide.

• Aqueous aluminum and bromine gas react to produce aqueous aluminum bromide.

Balance the chemical equation shown below. What is the coefficient in front of O_2(g)?

Fe_(s) + O_2(g) → Fe₍₂₎O_3(s)

• 2

• 3

• 45

Will the double displacement reaction NaOH + CaBr₂ occur? If so, what is the product of the reaction?

• No

• Yes, Br(OH)₂

• Yes, CaNa

• Yes, Ca(OH)₂

What type of reaction occurs when potassium and chlorine gas produce potassium chloride?

• combustion

• decomposition

• replacement

• synthesis

The following chemical equation is classified as a ______________.

CaCO₃ → CaO + CO₂

• synthesis reaction

• decomposition reaction

• single-replacement reaction

• double-replacement reaction

The thermite reaction involves iron, aluminum, and oxygen and releases a great deal of heat. What is the correct chemical equation for the thermite reaction?

• 2Fe_(s) + Al₂O_3(s) → Fe₂O_3(s) + 2Al_(s)

• 2Al_(s) + Fe₂O_3(s) → Al₂O_3(s) + 2Fe_(s)

• 3Fe_(s) + 2Al₂O_3(s) → 3Fe₂O_3(s) + 2Al_(s)

• 3Al_(s) + Fe₂O_3(s) → 3Al₂O_3(s) + 2Fe_(s)

Hydrogen peroxide, H₂O₂, changes in the presence of a catalyst in the following reaction. What type of chemical reaction is this?

 2H₂O_2(aq) → 2H₂O_(l) + O_2(g)

• synthesis reaction

• combustion reaction

• decomposition reaction

• single replacement reaction