H Chemistry: Unit 1

Question 1

Scientific Method

Answer 1

make observations, form a hypothesis, perform a controlled experiment, analyze data, form a theory

Question 2

hypothesis

Answer 2

reasonable explanation for a series of events

Question 3

control

Answer 3

factor that stays the same or constant

Question 4

variable

Answer 4

factor that changes

Question 5

independent variable

Answer 5

factor being studied

Question 6

dependent variable

Answer 6

factor being measured; data

Question 7

theory

Answer 7

reasonable explanation for a series of events that has been tested and has data to support it

Question 8

chemistry

Answer 8

study of matter and the changes it undergoes

Question 9

matter

Answer 9

anything that has mass and occupies space

Question 10

mass

Answer 10

the amount of matter in an object

Question 11

weight

Answer 11

force of attraction between two objects that have mass; measured in newtons

Question 12

mass is

Answer 12

constant

Question 13

weight changes with

Answer 13

location

Question 14

SI

Answer 14

international system of measurement

Question 15

base units

Answer 15

units that are based on a physical object in the real world

Question 16

base unit: mass

Answer 16

kilogram(kg)

Question 17

base unit: length

Answer 17

meter(m)

Question 18

base unit: time

Answer 18

seconds(s)

Question 19

base unit: amount

Answer 19

mole(mol)

Question 20

base unit: electric current

Answer 20

ampere(A)

Question 21

base unit: luminous intensity

Answer 21

candela(cd)

Question 22

base unit: temperature

Answer 22

kelvin(K)

Question 23

derived unit

Answer 23

SI unit that is derived from base units

Question 24

derived unit: volume

Answer 24

meters cubed(m^3)

Question 25

derived unit: density

Answer 25

grams per cubic centimeter(g/cm^3 or g/mL)

Question 26

derived unit: speed

Answer 26

meters per second(m/s)

Question 27

scientific notation

Answer 27

abbreviated form of a very large or small number

Question 28

accuracy

Answer 28

how close a measurement is to a true or accepted value

Question 29

precision

Answer 29

how close together or consistent measurements are to each other

Question 30

if the number before 5 is even and 0 is after it

Answer 30

don't round up

Question 31

if the number before 5 is odd and 0 is after it

Answer 31

round up

Question 32

dimensional analysis

Answer 32

problem solving method that uses conversion factors multiplied together to obtain a solution

Question 33

density

Answer 33

a mass to volume ratio that is measured in g/ml or g/cm^3

Question 34

density is

Answer 34

unique to all pure substances

Question 35

density of pure water

Answer 35

1.0g/mL

Question 36

density=

Answer 36

mass/volume

Question 37

percent error

Answer 37

comparison between an accepted value and an experimental value expressed as a percentage

Question 38

percent error=

Answer 38

(difference between values)/accepted value x 100

Question 39

uncertainty

Answer 39

practice of adding ± 1 in the most accurate placeholder of significance to add validity to your measurements