Summative test

Summative test

7th - 8th Grade

40 Qs

quiz-placeholder

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Summative test

Summative test

Assessment

Quiz

Life Skills

7th - 8th Grade

Practice Problem

Hard

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40 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is refrigeration used to preserve food?

Refrigeration increases the activation energy of spoilage reactions.

Refrigeration increases the concentration of reactants involved in spoilage.

Refrigeration decreases the collision frequency of molecules involved in spoilage.

Refrigeration increases the surface area of food, promoting spoilage.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does increasing the surface area of a solid reactant speed up a reaction, such as in combustion?

It increases the activation energy required.

It decreases the number of reactant collisions.

It increases the frequency of reactant collisions.

It lowers the temperature of the reaction.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is it important to control the temperature when producing certain materials, like plastics?

Temperature has no effect on reaction rates in material production.

High temperatures always speed up reactions, regardless of the material.

Precise temperature control ensures the desired reaction rate and product formation.

Lower temperatures always slow down reactions, leading to better quality materials.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does a fire extinguisher work to control fire?

It removes oxygen from the reaction, starving the fire.

It increases the concentration of oxygen, fueling the fire.

It increases the surface area of the fuel, promoting combustion.

It raises the temperature, accelerating combustion.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why are catalysts used in many industrial processes?

Catalysts increase the activation energy of the reaction.

Catalysts increase the reaction rate without being consumed.

Catalysts decrease the concentration of reactants.

Catalysts increase the temperature of the reaction.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does the use of inhibitors help prevent corrosion?

Inhibitors increase the concentration of reactants.

Inhibitors increase the rate of oxidation

Inhibitors slow down the corrosion reaction.

Inhibitors increase the surface area available for corrosion.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is it crucial to monitor and control the concentration of reactants in many chemical processes?

Concentration has no significant impact on reaction rates.

Higher concentrations always lead to faster reactions, regardless of the process.

Precise concentration control ensures the desired reaction rate and product yield.

Lower concentrations always lead to slower reactions, which is always desirable.

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