science ch. 10 (heat)

Question 1

what is conduction?

Answer 1

the transfer of thermal energy from one substance to another through direct contact

Question 2

what can conduction occur in?

Answer 2

liquid, gas, and solids

Question 3

what is convection?

Answer 3

the transfer of thermal energy by the movement of a liquid or a gas

Question 4

what is radiation?

Answer 4

the transfer of energy by electromagnetic waves, such as visible light, ultraviolet waves and infrared waves.

Question 5

why is it a good idea to be able to heat a house by putting heating floors?

Answer 5

a heat floor helps distribute the heat evenly instead of having the cold air stay lower and the warm air just stay higher (the house overall is just heated more evenly)

Question 6

explain what happens in the greenhouse effect.

Answer 6

radiation from the sun heats the earth which then heats the air. the heat rises by convection and is trapped by the clouds and greenhouse gases. this trapped heat energy allows life on our planet, but too many of these gases may increase the temperature of our planet.

Question 7

is the greenhouse effect a good thing or a bad thing?

Answer 7

the greenhouse effect is a good thing, but overtime people have emitted more greenhouse gases while cutting down trees and ruining the ocean, which leads to not having enough plants to make the carbon dioxide turn into oxygen. but the overall concept of it is good.

Question 8

what is the relationship between the greenhouse effect and global warming?

Answer 8

greenhouse effect and global warming start from greenhouse gases. but over time, there have been too many greenhouse gases emitted into the atmosphere, so it has started to warm up our poles and affect our weather since there aren’t enough plant organisms to make it into oxygen.

Question 9

Q = m x c x ΔT?

Answer 9

q = heat added, c =specific heat, m = mass, ΔT = change in temperature

Question 10

why does heat rise?

Answer 10

heat rises because when the air is heated it begins to expand. after the air starts to expand, the air around begins to get less dense.

Question 11

what is in the fire triangle?

Answer 11

Fuel, heat, oxygen

Question 12

what are the 3 things that a candle produces

Answer 12

ash, condensation (water), carbon dioxide

Question 13

what does burning match bring to the candle?

Answer 13

heat

Question 14

what is actually on fire when a candle burns?

Answer 14

solid wax

Question 15

what is the wick’s main purpose in a burning candle?

Answer 15

it absorbs the liquid wax

Question 16

what is the white smoke that we saw when the candle was blown out?

Answer 16

wax gas

Question 17

what is the smoke that turned the bromothymol blue to green?

Answer 17

carbon dioxide

Question 18

what does the heat (flame) do?

Answer 18

it melts the wax and vaporizes the wax

Question 19

if the scorch mark on the 3x5 card looked like the following scorch mark what would that tell you about the wick?

Answer 19

that the solid wax is burning

Question 20

describe how a candle works?

Answer 20

in the beginning, when you light a candle, the heat which is created from the flame begins to melt that wax located by the wick. then the flame turns the liquid wax into gas wax and melts the candle along with keeping the flame going.

Question 21

kinetic energy

Answer 21

energy of motion

Question 22

thermal energy

Answer 22

the total kinetic energy of the particles measured in joules

Question 23

temperature

Answer 23

the degree or intensity of heat present in a substance or object

Question 24

thermal expansion

Answer 24

the general increase in the volume of a material as its temperature is increased

Question 25

heat

Answer 25

the energy transferred between objects that are at different temperatures

Question 26

conductor

Answer 26

materials that let energy and heat to travel through easily like metal

Question 27

insulator

Answer 27

materials that are poor conductors like wood

Question 28

specific heat

Answer 28

amount of energy needed to raise one gram of a substance, one degree Celsius

Question 29

calories

Answer 29

a unit for measuring heat equal to the amount of heat required to raise the temperature of one gram of water one degree Celsius

Question 30

joules

Answer 30

unit of work or energy