Chapter 1 Review

Question 1

What are some indicators of a chemical reaction?

Answer 1

A precipitate forming, color changing, a gas forming (bubbles), temperature change, and noticeable odor.

Question 2

If you can get the things back, it is a

Answer 2

Physical change

Question 3

If you can’t get the things back and there is a new product, it is a

Answer 3

chemical change

Question 4

What is an angstrom?

Answer 4

10^-10 meters

Question 5

What is the angstrom used to measure?

Answer 5

Atoms

Question 6

What is the metric unit for distance?

Answer 6

Meters

Question 7

What is the metric unit for volume?

Answer 7

Liters

Question 8

What is the metric unit for temperature?

Answer 8

Kelvin

Question 9

What is the metric unit for time?

Answer 9

Seconds

Question 10

What is the metric unit for mass?

Answer 10

Grams

Question 11

What is the metric unit for energy?

Answer 11

Joules

Question 12

What is the metric unit for the amount of stuff?

Answer 12

Moles

Question 13

What is the conversion from °C to K?

Answer 13

K = °C +273.15

Question 14

What is absolute zero in °C?

Answer 14

-273.15

Question 15

What is a decimeter?

Answer 15

1/10 of a meter

Question 16

What is a centimeter?

Answer 16

1/100 of a meter

Question 17

What is a millimeter?

Answer 17

1/1000 of a meter

Question 18

What is a micrometer?

Answer 18

1/1000000 of a meter or 1.0*10^-6 m

Question 19

What is a nanometer?

Answer 19

1/1000000000 of a meter or 1.0*10^-9 m

Question 20

What is a picometer?

Answer 20

1/1000000000000 of a meter or 1.0*10^-12 m

Question 21

What is a decameter?

Answer 21

10 meters

Question 22

What is a kilometer?

Answer 22

1000 meters

Question 23

What is a histogram?

Answer 23

Graphing of numbers according to how often they appear

Question 24

How is a histogram made?

Answer 24

Data is binned into convenient ranges

Question 25

What does changing the bin size do?

Answer 25

It changes the appearance of the graph and the conclusions drawn from the graph

Question 26

What do histograms allow us to analyze?

Answer 26

Extremely large data sets by reducing them to one graph.

Question 27

What does a histogram show?

Answer 27

The primary, secondary, and tetriary peaks in data and give a visual representation of the significance of those peaks.

Question 28

What is the 5% rule?

Answer 28

If the 0<=x<=5 then the data is reliable

Question 29

What is the 5% rule equation?

Answer 29

x=(y-intercept/largest y-value)*100

Question 30

What do sig-figs not apply to?

Answer 30

counted numbers

Question 31

How should estimation be done regarding sig-figs?

Answer 31

Take what the instrument gives you and estimate the last value

Question 32

All non-zero digits are

Answer 32

significant

Question 33

all zeros between non-zero digits are

Answer 33

significant

Question 34

zeros to the right of a non-zero digit and a decimal point are

Answer 34

significant

Question 35

zeros to the right of a non-zero digit but not a decimal point are

Answer 35

not significant

Question 36

zeros to the right of a decimal point but not to the right of a non-zero digit are

Answer 36

not necessarily significant

Question 37

zeros between a non-zero digit and a decimal point are

Answer 37

significant

Question 38

zeros before non-zero digits are

Answer 38

not significant

Question 39

How many sig-figs are there in 27591.452?

Answer 39

8

Question 40

How many sig-figs are there in 50?

Answer 40

3

Question 41

how many sig-figs are there in 250?

Answer 41

2

Question 42

How many sig-figs are there in 25.0?

Answer 42

3

Question 43

How many sig-figs are there in 250.?

Answer 43

3

Question 44

How many sig figs are there in 0.0025?

Answer 44

2

Question 45

How many sig figs are there in 02340.4050

Answer 45

8

Question 46

What is the percent error equation?

Answer 46

((|experimental value - theoretical value\)/theoretical value)*100

Question 47

What is a good percent error?

Answer 47

<10%

Question 48

What is a pretty good percent error?

Answer 48

<20%

Question 49

What is a decent percent error?

Answer 49

<30%

Question 50

When adding or subtracting, the answer should have what?

Answer 50

The same number of decimal places as the measurement with the least decimal places

Question 51

When adding or subtracting, do you count sig-figs?

Answer 51

NO

Question 52

When multiplying or dividing, do you count sig-figs?

Answer 52

YES

Question 53

When multiplying or dividing, the answer should have what?

Answer 53

Sig-figs as the measurement with the least amount of sig-figs

Question 54

How do you know which digit is uncertain?

Answer 54

The digit that was estimated

Question 55

Uncertainty is always..

Answer 55

+- 1 (i.e. +-0.1, +-1, +-10, etc.)

Question 56

What is density?

Answer 56

how much matter is in a given space

Question 57

What is dimensional analysis based off of?

Answer 57

The cancelling of units and the use of conversion factors

Question 58

What is a conversion factor?

Answer 58

Any # with 2 units of measure

Question 59

Can a conversion factor be flipped?

Answer 59

yes