Unit 1 + 2

Question 1

How to work faucets and gas

Answer 1

Righty tighty for water and parallel for gas

Question 2

What’s chemistry?

Answer 2

The study of matter and the changes that it undergoes

Question 3

Matter

Answer 3

Anything that has mass and volume

Question 4

Mass

Answer 4

A measurement of the amount of matter in an object, measures in grams

Question 5

What’s used to measure mass?

Answer 5

A balance is used to measure mass

Question 6

Difference between weight and mass

Answer 6

Weight dependent on gravity, mass is the amount of matter

Question 7

What’s volume and how’s it measured?

Answer 7

Anything that takes up space, measured in mL

Question 8

What’s used to measure volume?

Answer 8

Graduated cylinder

Question 9

Organic chemistry and examples

Answer 9

Chemicals containing carbon, pharmaceuticals and plastics

Question 10

Inorganic chemistry

Answer 10

Matter that doesn’t contain carbon; minerals, metals, nonmetals

Question 11

What’re diatomic molecules?

Answer 11

Molecules composed of ONLY 2 atoms

Question 12

Control group

Answer 12

Reference group to the experimental group that contains no IV

Question 13

Title of an experiment

Answer 13

The effect of IV on DV

Question 14

Hypothesis

Answer 14

Educated guess on the effect of IV on DV. Made after making observations + research

Question 15

Hypothesis format

Answer 15

If the IV is changed *a certain way*, then the DV with change *this way*.

Question 16

of trials

Answer 16

The more, the better/ more accurate

Question 17

Are hypotheses proven?

Answer 17

Hypotheses are never proven, always subject to additions research

Question 18

Theory

Answer 18

Explanation that has been supported by many experiments, always changeable based on new data

Question 19

Scientific Law

Answer 19

Relationships supported by many experiments, and for which NO EXCEPTION has been found

Question 20

According to the scientific method, what happens if the hypothesis is rejected based on the conclusion?

Answer 20

Reformulate + retest

Question 21

2 types of data

Answer 21

Qualitative: physical characteristic related to 5 senses Quantitative: numerical data

Question 22

X axis is always labeled

Answer 22

IV

Question 23

Y axis is always labeled

Answer 23

DV

Question 24

Direct relationship

Answer 24

Both variables (IV + DV) increase/decrease / / /

Question 25

Indirect relationship

Answer 25

Both variables (IV + DV) go in opposite directions \ \ \

Question 26

Slope formula

Answer 26

(y2-y1)/ (x2-x1)

Question 27

Outliers

Answer 27

Data points that are way off/ unordinary Throws data averages off

Question 28

Significant figures (sig figs)

Answer 28

The digits in a number that you actually know

Question 28

Scientific notation: +/ - powers

Answer 28

Positive (+): move to right Negative (-): move to left

Question 29

How many sig figs should your answer have if it's +/-?

Answer 29

w/ fewest figs after the decimal point = # of sig figs u can have after decimal of answer

Question 29

Sig fig example 1,495.2 + 1.990

Answer 29

1,495.2 + 1.990 = 1497.2

Question 29

How many sig figs should your answer have if it's x or /?

Answer 29

The answer has the same # of sig figs as your least precise measurement

Question 29

deci-

Answer 29

d = 0.1 Decade

Question 29

centi-

Answer 29

c = .01 Century

Question 30

milli-

Answer 30

m = .001

Question 31

1 in = ? cm

Answer 31

1 in = 2.54 cm

Question 32

1 quart = ? mL

Answer 32

1 quart = 946 mL

Question 33

1 Liter = ? quarts

Answer 33

1 Liter = 1.06 quarts

Question 33

1 lb = ? grams

Answer 33

1 lb = 454 grams

Question 33

1 gallon = ? quarts

Answer 33

1 gallon = 4 quarts

Question 34

1 kg = ? lb (pounds)

Answer 34

1 kg = 2.2 lb (pounds)

Question 35

What do u do if u spill chemicals on body?

Answer 35

Rinse/ wash with water

Question 36

In a valid measurement, you record...

Answer 36

In a valid measurement, you record 1 estimated digit

Question 37

Always estimate to ___ extra decimal place

Answer 37

Always estimate to 1 extra decimal place

Question 38

Precision

Answer 38

How close a group of measurements are to each other (consistency).

Question 39

Accuracy

Answer 39

How close a group up of measurements is to a standard/ known value

Question 40

% Error + % Yield =

Answer 40

% Error + % Yield = 100%

Question 41

Percent yield formula

Answer 41

Percent yield: (actual yield (experimental) / theoretical yield) x 100

Question 42

Percent error formula

Answer 42

Percent error: l(theoretical value - experimental value)/theoretical value)l x 100

Question 43

Theoretical value

Answer 43

Actual, Known, True Value

Question 44

Measured Numbers

Answer 44

The numbers you get whe using a measuring tool to determine a quantity such as height/weight

Question 45

Exact Numbers

Answer 45

Counted, not measured Ex. 2 soccer balls, 1 pizza

Question 46

Can you weight directly on the balance pan?

Answer 46

No, must have a container

Question 47

Can you weight hot/cold objects?

Answer 47

No, you can't weight hot/ cold objects.

Question 48

ASADMODE

Answer 48

Addition Subtraction After Decimal, Multiply or Divide Everything (least amount of each)

Question 49

1 cm^3 = ? mL

Answer 49

1 cm^3 = 1 mL

Question 50

Water = ? mL

Answer 50

Water = 1.03 mL

Question 51

Density formula

Answer 51

Mass/ Volume

Question 52

Volume: Liquid: density= / Solid: density= /

Answer 52

Liquid: density=grams/mL Solid: density=grams/cm^3

Question 53

How to multiply 2 numbers in scientific notation

Answer 53

Multiply coefficients, and add powers.