2 Changes in Matter

Question 1

physical change

Answer 1

any change that alters the form or appearance of matter but does not make any substance in the matter into a different substance.
Example: Water is still H2O even when it’s frozen into ice or evaporated into steam.

Question 2

4 kinds of physical changes

Answer 2

A change in the state, shape, color or size

Question 3

chemical change

Answer 3

A change in matter that produces one or more new substances – with properties different from those of the original substances

Question 4

chemical reaction

Answer 4

same as “chemical change of state”

Question 5

4 kinds of chemical changes

Answer 5

combustion, electrolysis, oxidation, and tarnishing

Question 6

Law of Conservation of Matter

Answer 6

matter is not created or destroyed in any chemical or physical change.

Question 7

mass

Answer 7

the measurement of the amount of matter

Question 8

energy

Answer 8

the ability to do “work” or cause change

Question 9

4 kinds of energy

Answer 9

thermal energy, chemical energy, electromagnetic energy, and electrical energy (think up an acronym: TCEE or ETCE or CEET or TEEC…)

Question 10

temperature

Answer 10

a measure of the average energy of random motion of particles of matter

Question 11

thermal energy

Answer 11

the total energy of all the particles in an object. Thermal energy always flows from warmer matter to cooler matter.

Question 12

direction of thermal energy

Answer 12

Thermal energy always flows from warmer matter to cooler matter.

Question 13

2 kinds of thermal energy

Answer 13

endothermic and exothermic

Question 14

exothermic energy

Answer 14

Example: energy is given off / out, such as in combustion

Question 15

endothermic energy

Answer 15

Example: energy is absorbed inward, such as a melting ice cube

Question 16

chemical energy

Answer 16

the energy stored in the chemical bonds between molecules

Question 17

electro-magnetic energy

Answer 17

a form of energy that travels through space as waves

Example: visible light

Question 18

electrical energy

Answer 18

the energy of electrically charged particles moving from one place to another

Question 19

electrolysis

Answer 19

splitting the molecules of water into Hydrogen and Oxygen, using electricity to break the bonds of H2O.

Question 20

electrode

Answer 20

a metal strip

Question 21

transforming energy (from one type to another)

Answer 21

Chemical energy may be changed to other forms of energy during a chemical reaction. Or, other forms of energy may be changed into chemical energy.