Unit 10 Post-Assessment Remediation (PAR)

Hydrochloric acid reacts faster with powdered zinc than with an equal mass of zinc strips because the greater the surface area of the powdered zinc ___.

• decreases the frequency of particle collisions

• decreases the activation energy of the reaction

• increases the frequency of particle collisions

• increases the activation energy of the reaction

Tags

NGSS.HS-PS1-5

A chemical reaction occurs when reactant particles ___.

• are separated by great distances

• have no attractive forces between them

• collide with proper energy and proper orientation

• convert chemical energy into nuclear energy

A potential energy diagram for a chemical reaction is given below. Each interval on the potential energy axis represents 100 kilojoules of potential energy. What can be concluded from the diagram?

• The reaction is endothermic, and the heat of reaction is –200. kJ.

• The reaction is endothermic, and the heat of reaction is +200. kJ.

• The reaction is exothermic, and the heat of reaction is -200. kJ.

• The reaction is exothermic, and the heat of reaction is +200. kJ.

Tags

NGSS.HS-PS1-4

Given the potential energy diagram for a reaction: Which numbered interval represents the activation energy of the reaction?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Which lettered interval on the diagram represents the potential energy of the products?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

According to Table I, which potential energy diagram best represents the reaction that forms H₂O(l) from its elements?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-4

Catalysts can increase the rate of a chemical reaction by providing

• an alternate reaction pathway with a higher activation energy

• the same reaction pathway with a higher activation energy

• an alternate reaction pathway with a lower activation energy

• the same reaction pathway with a lower activation energy

Tags

NGSS.HS-PS1-4

At 101.3 kPa and 298 K, a 1.0-mole sample of which compound absorbs the greatest amount of heat as the entire sample dissolves in water?

• LiBr

• NaCl

• NaOH

• NH₄Cl

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Systems in nature tend to undergo changes toward

• higher energy and higher entropy

• higher energy and lower entropy

• lower energy and higher entropy

• lower energy and lower entropy

Tags

NGSS.HS-PS3-4

Given the balanced equation representing a phase change:

C₆H₁₂O₆(s) + energy → C₆H₁₂O₆(l)

Which statement describes this change?

• It is endothermic, and entropy decreases.

• It is endothermic, and entropy increases.

• It is exothermic, and entropy decreases.

• It is exothermic, and entropy increases.