Types of Reactions and Balancing Review

Which reaction represents the process of neutralization?

• Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g)

• Pb(NO₃)₂(aq) + CaCl(aq) → Ca(NO₃)₂(aq) + PbCl₂(s)

• 2 KClO₃(s) → KCl(s) + 3 O₂(g)

• HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)

Based on the observation of a reddish-brown solid forming, which type of reaction can the student infer has occurred? (see picture of rection)

• acid-base reaction

• decomposition reaction

• combustion reaction

• precipitation reaction

When the equation is balanced using the smallest whole-number coefficients, what is the ratio of moles of hydrogen consumed to moles of ammonia produced?

__N₂ + __H₂ --> __NH₃

• 1:3

• 3:2

• 3:1

• 2:3

Tags

NGSS.HS-PS1-7

Which statements of the following are true regarding the equation listed below?

Fe + CuCl₂ → FeCl₂ + Cu

Select TWO correct answers.

• The equation is balanced.

• The equation is not balanced.

• This is a synthesis reaction.

• This is a single-replacement reaction.

• This is a decomposition reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What always happens when a chemical reaction occurs?

• New substances are formed.

• Gases and light are given off.

• Substances change size and shape.

• The mass of the reactants is converted into energy.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What kind of reaction occurs when hydrochloric acid is neutralized with magnesium hydroxide?

2HCl + Mg(OH)₂ --> MgCl₂ + 2H₂O

(select BEST answer)

• Synthesis

• Combustion

• Single replacement

• Double replacement

When the equation ___ Al(s) + ___ O₂(g) → ___ Al₂O₃(s) is correctly balanced using the smallest whole numbers, what will be the coefficient of Al(s)?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

Which of the following equations represents a single-replacement reaction?

• NaOH(aq) + HCl(aq) ↔ NaCl(aq) + H₂O(l)

• Mg(s) + ZnCl₂(aq) ↔ Zn(s) + MgCl₂(aq)

• 2HCl(aq) + Ba(OH)₂(aq) ↔ BaCl₂(aq) + 2H₂O(l)

• 2AgNO₃(aq) + Na₂CrO₄(aq) ↔ Ag₂CrO₄(s) + 2NaNO₃(aq)

Which of the following is a type of chemical reaction where an element switches places with another in a compound?

• Synthesis

• Decomposition

• Single replacement

• Double replacement

In a double replacement reaction, what happens?

• Two elements combine to form a compound

• A compound breaks into its components

• Two components of two compounds switch places forming two new compounds

• An element switches places with another in a compound