test unit 1

Question 1

Law of Conservation of Mass

Answer 1

in an enclosed system, the mass will not change

Question 2

unit of mass

Answer 2

g grams

Question 3

unit of volume

Answer 3

mL or cm3

Question 4

matter has

Answer 4

grams and volumes

Question 5

system

Answer 5

all the chemicals and the container

Question 6

surrounding

Answer 6

everything outside of the system

Question 7

Proper Measurment

Answer 7

all of the numbers you know for certain (because they are visible on the instrument) plus one estimation

Question 8

density equation

Answer 8

mass over volume

Question 9

mass

Answer 9

amount of matter in an object

Question 10

volume

Answer 10

amount of space something takes up

Question 11

mass and volume realtionship

Answer 11

mass and volume are directly proportional, meaning they have a constant rate of change
if one doubles the other doubles

this proves density is constant

Question 12

slope equals what so therefore what

Answer 12

slope is density so therefore density has a constant rate of change

Question 13

how can density be used for identification

Answer 13

no 2 substances have the same density, so density can be used to identify a substance`

Question 14

density

Answer 14

ratio of mass to volume

Question 15

measurement of 100 mL graduated cylinder

Answer 15

tenths

Question 16

measurement of 10 mL graduated cylinder

Answer 16

hundreths

Question 17

measurement of scale

Answer 17

hundreths

Question 18

measurement of ruler

Answer 18

hundreths

Question 19

Particle Diagram of a solid (know picture to back up)

Answer 19

a solid is rigid
and is the most dense of the 3 states of matter so the particles are more compact/closer together

Question 20

Particle Diagram of a liquid (know picture to back up)

Answer 20

a liquid is much more fluid and less dense so the particles are more spread apart and can take up more space

Question 21

Particle Diagram of a gas (know picture to back up)

Answer 21

Gas has the most volume, meaning it take up the most space and the is the least dense of the 3 states of matter so the particles are spread the farthest apart

Question 22

1 kg =

Answer 22

1000 g

Question 23

UNIT CONSERVATION STAIRS

Answer 23

Kilo, skip 2 stairs, base unit, deci, centi, milli

Question 24

significance of leading zeros?

Answer 24

never significant

Question 25

significance of lagging zeros?

Answer 25

if a decimal is present, yes significant

Question 26

ADD/SUB Sig Figs

Answer 26

answer goes to the lowest place value of the 2 numbers added

Question 27

MULT/DIV

Answer 27

answer goes to the lowest sig fig amount of the 2 numbers multiplied

Question 28

what does each variable stand for relating to a mass and volume graph
y=mx+b

Answer 28

y is mass
m is density (slope)
x is volume
and d you don’t want to have keep in mind 5 percent rule

Question 29

get rid of b (y intercept)

Answer 29

the 5 percent rule is to see if the y intercept can be dropped from the equation of a line on a graph

EQUATION: b/y max multiplied by 100 if the answer is less than 5 or negative 5 percent you can drop the y intercept (b)

Question 30

How do you calculate error rate?

Answer 30

(average slope of a substance-theoretical)/theoretical multiplied by 100

Question 31

know how to interpret a graph and draw on substances

Answer 31

WS 3 question 5

Question 32

How do you measure an irregular shaped solid

Answer 32

To measure the volume of an irregular shaped solid use volume displacement. To do volume displacement, you measure water in a container before and after an object is put inside the water. then use this equation: after-before=volume

Question 33

accuracy

Answer 33

how close measurements are to their true value

Question 34

precision

Answer 34

how close measurements are to each other (repeatability)

Question 35

what is the relationship between mL and cm3

Answer 35

they both measure volume but are different units

Question 36

metric unit for length

Answer 36

meterss

Question 37

histograms for no change

Answer 37

small box big box small box equal to first
-.03, -.01, +.01
salt and water (dissolving salt)
ice and water (melting ice)
change the shape of steel wool, stretching

Question 38

histograms for gained mass

Answer 38

big box then small starting +.01
-.03, -.01, +.01
burning steel wool

Question 39

histograms for loss of mass

Answer 39

-.05, -.03, -.01, +.01
big box small box starting at -.05\
alkaseltzer

Question 40

calculate the volume of gold that has a mass of 250.0 g (D = 19.3g)

Answer 40

19.3g/1= 250.0/x
cross multiplication
250=19.3x
x= 13.0 mL

Question 41

determine the mass of aluminium if the volume is 48.8 cm3 (D= 2.70 g)

Answer 41

132g

Question 42

draw a graph that represents the density of two different metals
state the meaning of the slope of the line

Answer 42

look at GP and unit summary
the slope of the line represents the mass to volume ratio, or density and how it is constant

Question 43

substances same size

Answer 43

same volume
Brass had more mass because it is more dense

Question 44

substances same mass

Answer 44

same mass
Brass has less volume because it is more dense so had to decrease volume to get the same bass

Question 45

During boiling bubbles appear in the liquid water whats inside the bubble

Answer 45

water vapor