CP Review on redox, thermochem and reaction rate

In a redox reaction, which of the following occurs?

• only oxidation occurs

• both oxidation and reduction occur

• only reduction occurs

• neither oxidation nor reduction occurs

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

Which of the following statements is true?

• Oxidation is a gain of electrons

• Reduction is an increase in oxidation number

• Reduction is a loss of electrons

• Oxidation is an increase in oxidation number

Tags

NGSS.HS-PS1-2

Fe ^o + Cu²⁺SO₄^2- → Fe ²⁺SO₄^2- + Cu^o, What is being oxidized?

• the copper

• the iron sulfate

• the iron

• the copper sulfate

Tags

NGSS.HS-PS1-2

A substance X can release iodine from potassium iodide. Which statement is true about X.

• It is a reducing agent

• It is an oxidizing agent

• It is an acid

• It is an element

Which of the following correctly defines the term reaction rate?

• rate of disappearance of products

• rate of formation of reactants

• rate of disappearance of reactants

• rate of formation of the reaction

Tags

NGSS.HS-PS1-5

Which factor increases reaction rate by forcing the reactant particles closer together?

• increased temperature

• increased pressure

• increased surface area

• increased concentration

Tags

NGSS.HS-PS1-5

A whole potato cooks faster if cut in small pieces because the smaller pieces have?

• a larger concentration

• a larger surface area

• a higher temperature

• a greater pressure

Which word equation shows a chemical reaction that occurs in the car catalytic converter?

• carbon monoxide + oxygen→ carbon dioxide

• sulfur + oxygen → sulfur dioxide

• carbon dioxide → carbon + oxygen

• water → hydrogen + oxygen

Tags

NGSS.HS-PS1-5

NGSS.HS-ESS3-4

Which of the following statements is true about an endothermic reaction?

• More bonds formed than broken

• Energy of reactants is greater than energy of products

• Energy is absorbed

• ∆H is usually negative

Tags

NGSS.HS-PS1-4

When copper sulfate reacts with zinc, the reaction releases heat. Which statement is true?

• the reaction is endothermic and ∆H is positive

• the reaction is exothermic and ∆H is positive

• the reaction is endothermic and ∆H is negative

• the reaction is exothermic and ∆H is negative

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4