Modeling 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.

Tags

NGSS.HS-PS1-2

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

Tags

NGSS.HS-PS1-7

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-PS1-1

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-LS2-3

NGSS.HS-LS2-5