Chemistry

Question 1

addition w sig figs

Answer 1

final answer should end in same place as least sig. term. If one has 1 dec point, and other has 2, final answer ends with 1 decimal point.

Question 2

sig fig rules

Answer 2

all non 0 digits are sig
all sandwiched 0s are sig
all leading 0s are not sig
trailing 0s are sig when there’s a decimal point

Question 3

multiplying w sig figs

Answer 3

count total # of sig figs in each term, and whichever has lower amount use that. If it’s 1400, do 1.4*10^3. scientific notation shows to the end of the whole number, but sig figs show sig numbers

Question 4

accurate

Answer 4

accurate when it’s close to the accepted value. use %error

Question 5

precise

Answer 5

when values are close to each other. use % deviation

Question 6

% error

Answer 6

(|measured-actual|\actual)*100

Question 7

average deviation

Answer 7

(measurment 1 - avg.)+(meas. 2 - avg.)…/# of measurments

Question 8

percent deviation

Answer 8

first find average deviation
(average deviation/average)*100

Question 9

density units

Answer 9

g/mL

Question 10

distance base unit

Answer 10

meter

Question 11

converting to density

Answer 11

• get to g/mL
• multiply by density
• convert to needed units

Question 12

.62 miles

Answer 12

1 km

Question 13

C to K

Answer 13

K = C +273

Question 14

K to C

Answer 14

C = K-273

Question 15

matter

Answer 15

• matter is made of particles surrounded by empty space
• anything that has mass and takes up space

Question 16

Mixture

Answer 16

• has comma or &
• matter is a mixture if there are different types of particles present
• can either by homogenous or heterogenous

Question 17

Pure substance

Answer 17

• all of the particles are identical
• can either then be a compound or element

Question 18

homogenous mixture

Answer 18

• when they’re mixed with each other

Question 19

heterogenous mixture

Answer 19

• when they’re not mixed with each other

Question 20

solution

Answer 20

a homogeneous mixture of two or more substances

Question 21

element

Answer 21

• a pure substance
• made from only one type of atom
• can either be atomic (only one)
• or molecular (multiple of the same one)

Question 22

compound

Answer 22

• a pure substance
• made from two or more types of atoms
• two different letters, just no comma or & in between

Question 23

solid

Answer 23

• holds shape
• fixed volume

Question 24

liquid

Answer 24

• shape of container
• free surface
• fixed volume
• slightly compressible
• in drawing would be at bottom of container at squished together across width

Question 25

gas

Answer 25

- shape of container - volume of container

Question 26

chemical properties

Answer 26

- oxidative ability (rusting), acidifies, flammability, reactivity

Question 27

physical properties

Answer 27

evaporate, melt, condense, freeze, sublime, deposition, melting/boiling/freezing points

Question 28

chemical change

Answer 28

- color change - temp. change - light - bubbles - a precipitate (separates)

Question 29

physical change

Answer 29

- reversible process

Question 30

boiling in a drawing

Answer 30

molecules spread out from liquid state

Question 31

settling/centrifuge

Answer 31

different weighted molecules either sink or float, separating mixture

Question 32

separating liquids

Answer 32

filtration, settling, distillation, chromatography

Question 33

distillation

Answer 33

- separating a liquid from a solution - liquid evaporates then condenses from heating and cooling

Question 34

filtration

Answer 34

- separates insoluble solids - filtering something using strainer

Question 35

solvent

Answer 35

liquid

Question 36

solute

Answer 36

solid

Question 37

insoluble

Answer 37

a solid that doesn't dissolve in liquid

Question 38

soluble

Answer 38

a solid that dissolves in a liquid or a solution

Question 39

sublimation

Answer 39

solid to gas

Question 40

deposition

Answer 40

gas to solid

Question 41

molecule

Answer 41

a group of atoms bonded together

Question 42

freezing

Answer 42

liquid to solid