Vocabulary

Question 1

Chemical Reaction

Answer 1

a chemical reaction is when a substance undergoes a change, and the atoms rearrange to form a new substance (product)

Question 2

Evidence of a Chemical Reaction

Answer 2

color change, gas (bubbles or new smell), heat given off or heat taken in, precipitate (solid that was not there created) forms

Question 3

Substance

Answer 3

a form of matter with a unique composition and distinct properties

Question 4

Analysis

Answer 4

to break down into small parts or components

Question 5

observation

Answer 5

something you can see, hear, touch, taste, smell (except no tasting)

Question 6

Inference

Answer 6

hypothesis (educated guess) about your observations - DOES NOT belong in evidence/data

Question 7

Property

Answer 7

something that can be observed or measured, used to describe something

Question 8

Physical Property

Answer 8

something that can be observed or measured without changing the substance into another substance (ex: mass, color, texture, melting point, can be molded)

Question 9

Physical Change

Answer 9

affects the physical properties of a substance, but not its chemical makeup. signs of a phys. change include a change in texture, state of matter, and shape

Question 10

Chemical Property

Answer 10

describes how an element can combine or react with another element, its ability to undergo a chemical reaction (rusting, combustion/burning) this change is IRREVERSIBLE

Question 11

Quantitative Data

Answer 11

numerical measurements; data in numerical form

Question 12

qualitative data

Answer 12

descriptive observations of properties of a substance

Question 13

Element

Answer 13

a basic substance that cannot be broken down into simpler substances during chemical reactions

Question 14

matter

Answer 14

anything that has mass and takes up space/volume

Question 15

Law of Conservation of Mass/Matter

Answer 15

in a chemical reaction, matter cannot be created or destroyed. the elements are only rearranged

Question 16

closed system

Answer 16

a setup that does not allow the substances inside to leave and does not allow things from the outside to enter (does not allow for matter in or out of the system)

Question 17

precipitate

Answer 17

solid that forms as a result of a reaction backed with 2 liquids, or 2 gases, or a liquid or a gas

Question 18

malleable

Answer 18

can be hammered into thin sheets

Question 19

ductile

Answer 19

can be drawn into thin wires

Question 20

temperature

Answer 20

the measure of heat or how fast molecules move (celsius/centigrade, Fahrenheit, kelvin)

Question 21

Expansion

Answer 21

the increase of volume due to increased kinetic energy of particles

Question 22

contraction

Answer 22

the decrease of volume due to decreased kinetic energy of particles

Question 23

compression

Answer 23

the decrease of volume of particles due to applied pressure (force)

Question 24

celsius/centigrade

Answer 24

based on water

Question 25

fahrenheit

Answer 25

based on pure water

Question 26

kelvin

Answer 26

starts from absolute zero (no molecular movement)

it doesn’t include negative numbers

Question 27

kinetic energy

Answer 27

the energy of motion

Question 28

particle

Answer 28

the smallest piece of a substance that’s still a substance

Question 29

compressed air

Answer 29

forcing air into a smaller space