chemistry exam

Question 1

chemical

Answer 1

any substance that has a defined composition.

Question 2

biochemistry

Answer 2

is the study of the chemical and physical reactions that occur in living things

Question 3

applied research is required in order to

Answer 3

solve a problem

Question 4

extensive property of matter

Answer 4

a property that depends on the size of the system (ex. volume, mass)

Question 5

Intensive property

Answer 5

doesnt depend on the amount in the system (ex. melting point, boiling point)

Question 6

atom

Answer 6

the smallest unit of an element that maintains the chemical identity of that element.

Question 7

compound

Answer 7

the substance hat can be broken down into more substances. each compound is made up by 2 or more atoms.

Question 8

mass

Answer 8

the measure of the quantity on matter

Question 9

chemical change

Answer 9

creates a whole new substance. cant go back

Question 10

physical change

Answer 10

doesnt change identity

Question 11

heterogenous

Answer 11

not uniform though out

Question 12

mixture

Answer 12

a blend of 2 or more types of matter each remains its own identity

Question 13

vertical columns

Answer 13

families/groups

Question 14

rows

Answer 14

periods

Question 15

metals

Answer 15

conducts eletricity

Question 16

metaloids

Answer 16

semi conductors

Question 17

non metals

Answer 17

low conductors

Question 18

qualitative observations

Answer 18

data descriptive.

Question 19

Theory

Answer 19

broad generalization that explains a body of facts

Question 20

standards of measurement

Answer 20

chosen because they have constant value, can easily reproduce

Question 21

examples of units

Answer 21

length, mass, time, temp, amount of substance, electric current,

Question 22

SI base for length and time

Answer 22

length; meter

time; second

Question 23

change in the force of gravity in an object will effect its

Answer 23

weight

Question 24

measurement of the amount of material

Answer 24

mass

Question 25

density formula

Answer 25

mass/volume

Question 26

how many minutes in one week

Answer 26

10,080

Question 27

the # of significant figure in .000305 kg

Answer 27

3