Quiz about Thermochemistry and Kinetics

Question 1

When energy is released, the reaction is described as ________.

Accepted Answer

exothermic

Answer

endothermic

Answer

zero order

Answer

first-order

Question 2

The value of change of enthalpy is ________ if the heat flow from the system to the surroundings

Accepted Answer

negative

Answer

positive

Answer

unchanged

Question 3

When energy is absorbed, the reaction is described as ________.

Accepted Answer

endothermic

Answer

exothermic

Answer

zero order

Answer

first-order

Question 4

It is defined as the degree of coldness or hotness of an object

Accepted Answer

temperature

Answer

heat

Answer

internal energy

Answer

enthalpy

Question 5

What type of reaction is this?

Accepted Answer

Exothermic

Answer

Endothermic

Answer

Kinetic

Answer

Potential

Question 6

It is defined as the energy contained within a system.

Accepted Answer

internal energy

Answer

heat

Answer

enthalpy

Answer

temperature

Question 7

A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction. If the temperature began at 15.0 degrees Celsius and ended at 27.5 degrees Celsius. If the reaction is our system, is the system endothermic or exothermic?

Accepted Answer

Endothermic

Answer

Exothermic

Question 8

When sodium hydroxide is added to hydrochloric acid, the temperature reading on the thermometer is ______________ and the reaction name is __________________

Accepted Answer

increasing

Accepted Answer

neutralisation

Answer

decreasing

Answer

constant

Answer

titration

Question 9

Dissolving ammonium salt in water will cause a ___________ in temperature

Accepted Answer

drop

Answer

increase

Answer

higher

Answer

constant

Question 10

when a piece of magnesium ribbon is added to some dilute hydrochloric acid in a test tube, a reaction occurs and the test tube becomes hot. the type of reaction is.....

Accepted Answer

exothermic reaction

Answer

endothermic reaction

Question 11

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

Accepted Answer

The system releases heat to the surroundings.

Answer

The system absorbs heat from the surroundings.

Answer

The temperature of the system decreases.

Answer

The enthalpy change is positive.

Question 12

In a chemical reaction, the rate of reaction is determined by:

Accepted Answer

The change in concentration of reactants over time.

Answer

The change in temperature of the surroundings.

Answer

The change in pressure of the system.

Answer

The change in volume of the system.

Question 13

What is the effect of a catalyst on a chemical reaction?

Accepted Answer

It decreases the activation energy required.

Answer

It increases the activation energy required.

Answer

It changes the enthalpy of the reaction.

Answer

It alters the equilibrium constant.

Question 14

Which of the following is a characteristic of an endothermic reaction?

Accepted Answer

The products have higher energy than the reactants.

Answer

The products have lower energy than the reactants.

Answer

The reaction releases heat to the surroundings.

Answer

The enthalpy change is negative.

Question 15

In thermochemistry, the enthalpy change of a reaction is defined as:

Accepted Answer

The heat absorbed or released at constant pressure.

Answer

The heat absorbed or released at constant volume.

Answer

The change in internal energy of the system.

Answer

The change in temperature of the system.

Question 16

Which factor does not affect the rate of a chemical reaction?

Accepted Answer

Color of reactants

Answer

Concentration of reactants

Answer

Temperature

Answer

Presence of a catalyst

Thermochemistry and Kinetics

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