Chemistry exam

Question 1

chemistry is the study of

Answer 1

matter

Question 2

matter is split into two subjects

Answer 2

substances and mixtures

Question 3

substances are categorized into two forms

Answer 3

element and compound

Question 4

elements

Answer 4

one type of atom

Question 5

compound

Answer 5

two or more different atoms chemically bonded

(compounds are made of atleast two different elements at DEFINITE RATIO)

Question 6

mixtures

Answer 6

two or more substances mixed at not definite ratio

Question 7

mixtures are split into two categories

Answer 7

homogeneous and heterogeneous

Question 8

homogeneous

Answer 8

solutions, mixture is the same throughout; visible to the naked eye

Question 9

heterogeneous

Answer 9

colloids and suspensions, is not same throughout

Question 10

5 rules for significant digits in multiplication and division

Answer 10

1. all non zero numbers are significant (ex. 2,357 = 4 sigfig)
2. trapped zeros are sig fig
   (ex. 2005= 4 sigfig)
3. trailing zeros are significant if there is a decimal in the number anywhere (ex. 2.500)
4. if there is no decimal trailing zeros are not sig figs
5. starting zeros not significant
   (ex. 0.0025 = 2 sig fig)

Question 11

rules for applying sig fig for addition and subtraction

Answer 11

the final answer MATCHES the LEAST TOTAL digits after the decimal

ex. 0.0005 {4 digits}
+ 26.3 {1 digit}
1.29 {2 digits}
—————————————-
27.5905 = 27.6 {1 digit}

Question 12

%error =

Answer 12

measured value - accepted value
% error = ——————– x100
accepted value

Question 13

solution is always…

Answer 13

homogeneous

Question 14

solids, gases, and liquids are all…

Answer 14

substances

Question 15

the only phase that isn’t a substance is ______ and it is..

Answer 15

aqueous, mixture (homogeneous)

Question 16

solids have..

Answer 16

solids (s)
-definite shape [geometric}
-definite volume
-vibrational motion

Question 17

gases have..

Answer 17

gases (g)
-no definite shape
-takes the shape of container if there is a lid
-no definite volume

Question 18

liquids have..

Answer 18

liquids (l)
-no definite shape
-take shape of container
-definite volume

Question 19

aqeous

Answer 19

aqeous (aq)
-mixture (homeogenous)
-NOT a substance, a solution
-substance dissolved in water

Question 20

mass

Answer 20

the amount of matter an object takes

Question 21

weight

Answer 21

the amount of gravity pushing u

Question 22

if the mass is higher, the density will….

Answer 22

increase as well

Question 23

density is

Answer 23

a comparison of how much matter there is in a certain amount of space
(how tightly packed everything is)

Question 24

kinetic energy

Answer 24

motion of particles

Question 25

potential energy

Answer 25

stored energy

Question 26

solid has the least _______ energy

Answer 26

kinetic

Question 27

gas has the highest _______ energy

Answer 27

kinetic

Question 28

lowest kelvin temperature

Answer 28

0 (absolute zero)

Question 29

when one energy changes, the other energy….

Answer 29

stays the same

Question 30

exothermic is

Answer 30

decreasing cooling curve \

Question 31

endothermic is

Answer 31

increasing heat curve /

Question 32

Celsius boiling point

Answer 32

100 C

Question 33

order of endothermic (/) heat curve

Answer 33

ALL ENERGY INCREASING

/A - B/: Solid {K.E increasing}

___B - C___: solid to liquid = solidifies/freezes {P.E}

/C - D /: liquid = reaches boiling point at D {K.E}

__D - E__: liquid to gas = boiling/vaporization {P.E}

/E - F/: gas {K.E}

Question 34

order of exothermic cooling curve

Answer 34

ALL ENERGY DECREASING

/F - E/: gas {K.E decreasing}

__E - D__: gas to liquid {P.E decreasing}

/D - C/: liquid {K.E decreasing}

__C - B__: liquid to solid= freezes/solidifies {P.E}

/B - A/: solid {K.E decreasing}

Question 35

melting is also known as

Answer 35

fusion

Question 36

solidifying is also known as

Answer 36

freezing

Question 37

For every change in KE there is the same type of change in

Answer 37

temperature

Question 38

Potential Energy on the graph is

( ______ or /)

Answer 38

______

Question 39

Kinetic Energy on the graph is

( ______ or /)

Answer 39

/

Question 40

sublimation

Answer 40

substances changing phases from solid to gas directly (skipping liquid phase)

Question 41

deposition

Answer 41

the opposite of sublimation, gas changing into solid

Question 42

1kj=

Answer 42

1000j

Question 43

precision on a bullseye is

Answer 43

when all the marks are close together, not necessarily next to the bullseye

Question 44

accuracy on a bullseye is

Answer 44

when all marks hit the bullseye