Topic 9 Chemical Reactions

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

• law of conservation of energy

• law of conservation of mass

• law of conservation of mass

• ideal gas law ideal gas law

Tags

NGSS.HS-PS1-7

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

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

Fe_(s) + O_2(g) → Fe₂O_3(s)

• 2

• 3

• 4

• 5

4.The following chemical equation is classified as a ______________.

CaCO3 → CaO + CO₂

• synthesis reaction

• decomposition reaction

• single-replacement reaction

• double-replacement reaction double-replacement reaction

5.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) + Al2O3(s) → Fe2O3(s) + 2Al(s)

• 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s)

• 3Fe(s) + 2Al2O3(s) → 3Fe2O3(s) + 2Al(s)

• 3Al(s) + Fe2O3(s) → 3Al2O3(s) + 2Fe(s) 3Al(s) + Fe2O3(s) → 3Al2O3(s) + 2Fe(s)

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

6.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 single replacement reaction

7.In the chemical equation below, which of the components is a precipitate?

HCl(aq) + AgNO₃(aq) → AgCl(s) + HNO₃(aq)

• HCl(aq)

• AgNO3(aq)

• AgCl(s)

• HNO3(aq) HNO3(aq)

8.Which of the following components will always be produced during a chemical reaction between an acid and a base?

• an acid

• a base

• a gas

• water

9.What is the net ionic equation for the following reaction?

HCl(aq) + KOH(aq) → H₂O + KCl(aq)

• Cl-(aq) + OH-(aq) → ClOH(aq)

• H+(aq) + K+(aq) → HK(aq)

• Cl-(aq) + K+(aq) → KCl(aq)

• H+(aq) + OH-(aq) → H2O(l) H+(aq) + OH-(aq) → H2O(l)

10.The carbon dioxide produced by cells is transported as bicarbonate ions. What reaction transforms bicarbonate back into carbon dioxide?

• HCO3- + H+ → CO2(g) + H2O(g)

• HCO3- + H+ → H2O(l)

• HCO3- + H+ → CO2(g) + H2O(l)

• HCO3- + H+ → CO2(g)

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

NGSS.HS-LS2-5