Reactivity 1: What drives chemical reactions?

Question 1

Transfer of energy in chemical reactions

Answer 1

All chemical reactions involve a transfer of energy between the system and the surroundings, while total energy is conserved.

Question 2

Exothermic reaction

Answer 2

Describes a reaction in which energy is transferred to the surroundings.

Question 3

Endothermic reaction

Answer 3

Describes a reaction in which energy is transferred from the surroundings.

Question 4

System in chemical equation

Answer 4

Part of the universe that is being studied, where a chemical reaction is happening.

Question 5

Surrounding in chemical equation

Answer 5

Refers to everything else in the universe that is not part of the system.

Question 6

Temperature Definition

Answer 6

A measure of the average kinetic energy of particles in a system

Question 7

Heat

Answer 7

A form of energy that is transferred between objects of different temperatures.

Heat is the energy transferred from a region of high temperature to a region of low temperature measured in units of J.

Question 8

Open System

Answer 8

Energy and matter can interchange with surroundings

Question 9

Closed System

Answer 9

Energy can exchange with surroundings but matter can not.

Question 10

Isolated System

Answer 10

Cannot transfer matter or energy to its surroundings

Question 11

Internal energy

Answer 11

The total energy of the system composed of the kinetic energy of the particles and their potential energy.

Question 12

Enthalpy Change

Answer 12

The heat transferred to or from the a system under constant pressure