chem unit 1 test

Question 1

element

Answer 1

all atoms are the same

Question 2

solid

Answer 2

atoms vibrate in one position (not free)

Question 3

pure substance

Answer 3

made up of only one MATERIAL

Question 4

what is the diff between an element and a pure substance?

Answer 4

all elements are pure substances
pure substance can be elements OR compounds

Question 5

molecule

Answer 5

two+ atoms are chemically joined to make a molecule

Question 6

compound

Answer 6

chemically combined 2 different atoms

Question 7

liquid

Answer 7

molecules are relatively close and free; moving about randomly and slowly

Question 8

gas

Answer 8

molecules are far apart and moving fast

Question 9

mixture

Answer 9

diff types of atoms/molecules that are physically together but not chemically bonded

Question 10

homo mixture

Answer 10

you can not physically see that it is NOT a mixture

Question 11

hetero mixture

Answer 11

you can physically see that is IS a mixture

Question 12

sig figs

Answer 12

the digits in a number that matter for showing how precise the measurement is

Question 13

mass unit

Answer 13

g, mg, kg,

Question 14

density unit

Answer 14

g/cm^3 or g/mL

Question 15

volume unit

Answer 15

cm^3, m^3, mL,L

Question 16

length, width, height

Answer 16

in, cm, m, ft, yard, mile

Question 17

0.1 estimate to —>

Answer 17

0.01

Question 18

1 estimate to —>

Answer 18

0.1

Question 19

10 estimate to —>

Answer 19

1

Question 20

density

Answer 20

m/v

Question 21

matter

Answer 21

anything that takes up space

Question 22

mass

Answer 22

a measure of the quantity of matter within an object

Question 23

weight

Answer 23

measure of the gravitational pull on the matter within an object

Question 24

would weight change if you were on mars versus if you were on earth? would mass?

Answer 24

weight would change
mass would not