Chemical Reactions Test

Which type of reaction is shown in the chemical equation 2H₂O → 2H₂ + O₂?

• double displacement

• decomposition

• synthesis

• single displacement

Will zinc displace gold in a chemical reaction?

• Yes, because zinc is more reactive than gold.

• No, because gold is more reactive than zinc.

• Yes, because zinc and gold have similar reactivity.

• No, because zinc and gold cannot react with each other.

Tags

NGSS.HS-PS1-1

Which type of reaction is shown in the chemical equation NH₃ + HCl → NH₄Cl?

• decomposition

• synthesis

• single displacement

• double displacement

Which of these is NOT evidence of a chemical reaction?

• An iron nail changes to a brownish-orange color.

• A piece of zinc raises the temperature of an acid as it reacts with it.

• An ice cube melts into liquid water.

• An antacid tablet produces bubbles of gas when placed in water.

Tags

NGSS.MS-PS1-2

Fill in the blanks using the available answer choices. The precipitate in the following reaction is __________. Pb(NO₃)₂(aq) + Na₂SO₄(aq) → PbSO₄(s) + 2NaNO₃(aq)

• PbSO₄

• ionic

• Na₂SO₄

• Pb(NO₃)₂

• NaNO₃

Tags

NGSS.MS-PS1-2

Which is an example of a balanced chemical equation?

• AgNO₃ + NaCl ➔ 4AgCl + 2NaNO₃

• AgNO₃ + NaCl ➔ AgCl + NaNO₃

• 2AgNO₃ + 2NaCl ➔ 3AgCl + 2NaNO₃

• AgNO₃ + 2NaCl ➔ 2AgCl + 2NaNO₃

Tags

NGSS.MS-PS1-5

When 46 g of sodium is exposed to dry air, 62 g of sodium oxide formed. What mass of oxygen was used?

• 16 g O₂

• 18 g O₂

• 20 g O₂

• 14 g O₂

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A __________ reaction involves bringing elements or compounds together to form new compounds, whereas, a __________ reaction involves breaking down compounds into smaller compounds or elements.

• synthesis and decomposition

• decomposition and synthesis

• combination and separation

• fusion and fission

Tags

NGSS.MS-PS1-5

Identify the reactants, the products, and their quantities in the following chemical equation: Cd(NO₃)₂(aq) + H₂S(g) → CdS(s) + 2HNO₃(aq).

• Reactants: Cd(NO₃)₂ and H₂S; Products: CdS and 2HNO₃

• Reactants: CdS and 2HNO₃; Products: Cd(NO₃)₂ and H₂S

• Reactants: Cd(NO₃)₂ and CdS; Products: H₂S and 2HNO₃

• Reactants: H₂S and 2HNO₃; Products: Cd(NO₃)₂ and CdS

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

________ are whole numbers used in front of chemical units to ________ a chemical equation such that there are equal amounts of reactants and products.

• Coefficients, balance

• Subscripts, equalize

• Molecules, adjust

• Atoms, stabilize