Intro to Energy.

Question 1

What is chemistry all about?

Answer 1

Matter.

Question 2

What is the universe?

Answer 2

Matter and energy.

Question 3

What do changes in a system involve?

Answer 3

A movement of matter driven by a flow of energy.

Question 4

When something is happening, energy is what?

Answer 4

Flowing.

Question 5

What is energy?

Answer 5

Energy is the capacity to do work or produce heat.

Question 6

What are the two types of energy?

Answer 6

Potential and kinetic energy.

Question 7

What is kinetic energy?

Answer 7

The energy of motion.

Question 8

What is potential energy?

Answer 8

Energy that is stored.

Question 9

What are some different types of potential energy.

Answer 9

Chemical, nuclear, gravitational, and elastic energy.

Question 10

What is chemical energy?

Answer 10

Energy stored in chemical bonds.

Question 11

What is nuclear energy?

Answer 11

Energy stored in the nuclei of atoms.

Question 12

What is gravitational energy?

Answer 12

Energy that is based on gravity.

Question 13

What is elastic energy?

Answer 13

Energy of compressible or stretchable objects.

Question 14

What are different types of kinetic energy?

Answer 14

Thermal, electrical, electromagnetic energy.

Question 15

What is thermal energy?

Answer 15

The total energy of all vibration particles that make up an object.

Question 16

What is electrical energy?

Answer 16

Kinetic energy of charged particles.

Question 17

What is electromagnetic radiation?

Answer 17

Microwaves, x-rays, and visible light.

Question 18

What SI unit do we use for energy?

Answer 18

The joule.

Question 19

One calorie of heat does what to water?

Answer 19

It raises the temperature of 1g of pure water.

Question 20

What is a Calorie (capital c)?

Answer 20

The energy content of foods and beverages.

Question 21

How many calories is one Calorie?

Answer 21

1 Calorie = 1000 calories.

Question 22

How many joules is equal to one calorie?

Answer 22

4.184 joules.

Question 23

What is thermochemistry?

Answer 23

The study of energy changes that happen during chemical reactions or changes of state.

Question 24

How can changes in energy be detected?

Answer 24

By observing heat transfers.

Question 25

What is heat?

Answer 25

Heat is the energy that transfers from one object to another because of a temperature difference.

Question 26

How does heat flow from object to object?

Answer 26

Heat flows from a warmer object to a cooler one.

Question 27

What is power equal to?

Answer 27

the rate of energy flow (watts).

Question 28

What is the law of conservation of energy?

Answer 28

Energy is not created or destroyed, only transferred or transformed.

Question 29

What is temperature?

Answer 29

The measure of the average kinetic energy of the particles in a material.

Question 30

More heat is equal to?

Answer 30

Higher temperature, but the change will vary depending on the substance

Question 31

What is specific heat (c)?

Answer 31

The amount of energy needed to increase the temperature of a substance by 1 C.

Question 32

How will materials that have high specific heats heat up?

Answer 32

They will heat up more slowly since it takes more energy to see the temp difference.

Question 33

How will material that have low specific heats heat up?

Answer 33

They will heat up quickly since it takes less energy to see temp difference.

Question 34

What is heat measured in?

Answer 34

Joules or calories.

Question 35

What are the three types of energy transfers?

Answer 35

Conduction, convection, radiation.

Question 36

What is conduction?

Answer 36

Heat that is transferred through touch.

Question 37

What is convection?

Answer 37

The rising/falling of substances due to heating/density difference.

Question 38

What is radiation?

Answer 38

Waves/energy.

Question 39

When does thermal conduction occur?

Answer 39

It occurs through oscillation of adjacent atoms.

Question 40

What is thermal conduction?

Answer 40

Energy passed through collisions of atoms.

Question 41

What is thermal conductivity?

Answer 41

How efficiently energy is conducted.

Question 42

What is conduction better in when it comes to states of matter?

Answer 42

Solids.

Question 43

What are low conductivities?

Answer 43

Insulators.

Question 44

What are great conductors?

Answer 44

Metals, due to the availability of valence electrons.

Question 45

Convection is the cycling of what?

Answer 45

Fluids given by differences in density.

Question 46

At high temperature molecules do what?

Answer 46

Molecules spread, they are less dense, and they rise.

Question 47

At low temps molecules do what?

Answer 47

Molecules spread out less, they are more dense, and they sink.

Question 48

What is viscosity?

Answer 48

A measure of a fluids resistance to flow.

Question 49

Atoms do what with radiation?

Answer 49

They absorb radiation and reemit it.

Question 50

Frequency and total amount of energy of the emitted radiation are functions of what?

Answer 50

The temperature of an object.