The reaction of calcium chloride and water in the hot pack tindak balas antara kalsium klorida dengan air dalam pek panas

releases water/ membebaskan air

releases heat/ membebaskan haba

Energy level diagram for endothermic reaction

•The energy of the products is higher than the energy of the reactants .

•The energy of the products is lower than the energy of the reactants .

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

The system releases heat to the surroundings.

The system absorbs heat from the surroundings.

The temperature of the system decreases.

The enthalpy change is positive.

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

The change in concentration of reactants over time.

The change in temperature of the surroundings.

The change in pressure of the system.

The change in volume of the system.

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

It decreases the activation energy required.

It increases the activation energy required.

It changes the enthalpy of the reaction.

It alters the equilibrium constant.

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

The products have higher energy than the reactants.

The products have lower energy than the reactants.

The reaction releases heat to the surroundings.

The enthalpy change is negative.

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

The heat absorbed or released at constant pressure.

The heat absorbed or released at constant volume.

The change in internal energy of the system.

The change in temperature of the system.

Thermochemistry and Kinetics

Quiz

•

Science

•

10th Grade

•

Practice Problem

•

Hard

•

NGSS

HS-PS1-4, HS-PS1-5, HS-PS3-4

+3

Standards-aligned

Lisa Thompson

FREE Resource

25 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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

endothermic

exothermic

zero order

first-order

Tags

NGSS.HS-PS1-4

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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

positive

negative

unchanged

Tags

NGSS.HS-PS3-4

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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

endothermic

exothermic

zero order

first-order

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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

heat

internal energy

enthalpy

temperature

Tags

NGSS.MS-PS3-4

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What type of reaction is this?

Exothermic

Endothermic

Kinetic

Potential

Tags

NGSS.HS-PS1-4

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

It is defined as the energy contained within a system.

heat

internal energy

enthalpy

temperature

7.

FILL IN THE BLANK QUESTION

1 min • 1 pt

It is the change in the concentration of the reactants and products per unit time.

Tags

NGSS.HS-PS1-5

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Thermochemistry and Kinetics

25 questions

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

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

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

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

What type of reaction is this?

It is defined as the energy contained within a system.

It is the change in the concentration of the reactants and products per unit time.

It is the factor affecting rate of reaction, wherein there is higher chances of collision because of increased amount of kinetic energy

The process of increasing the chemical reaction by adding a substance that increases the rate of reaction

A way to determine the rate of reaction for different concentration of reactants

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