Ch 2 Section 2

Question 1

Measurements represent

Answer 1

Quantities

Question 2

A quantity is something that has

Answer 2

Magnitude, size, or amount

Question 3

Quantity is not the same as a

Answer 3

Measurement

Question 4

Units of measurement compare

Answer 4

What is to be measured with a previously defined size

Question 5

Nearly every measurement is a

Answer 5

Number plus a unit with choice of unit depending on quantity being measured

Question 6

SI

Answer 6

Le systéme international d’Unités

Measurement system agreed on by scientists all over the world

Question 7

SI system adopted in

Answer 7

1960 by General Conference on weights and measures

Question 8

SI has

Answer 8

7 base units with most other units derived from these 7

Question 9

SI units are defined in terms of

Answer 9

Standards of measurement

Question 10

Standards are objects or natural phenomena that are of

Answer 10

Constant value
Easy to preserve and reproduce
Practical on size

Question 11

Numbers are written in a form that is

Answer 11

Agreed upon internationally

Question 12

Prefixes added to names of SI units represent

Answer 12

Quantities that are larger or smaller than the base units

Question 13

Centi

Answer 13

1/100

Question 14

1 cm

Answer 14

1/100 of a meter

Question 15

SI standard unit for mass is

Answer 15

Kilogram

Question 16

Gram

Answer 16

1/1000 of a kg

Question 17

Gram is more

Answer 17

Useful for measuring masses of Small objects

Question 18

For even smaller objects (measuring mass)

Answer 18

Milligram is used

Question 19

1 mg

Answer 19

1/1000 of a gram

Question 20

Mass is determined by

Answer 20

Comparing mass of an object with a set of standard masses that are part of the balance

Question 21

Measurements are

Answer 21

Quantitative information.

Question 22

Weight is a measure of the

Answer 22

Gravitational pull on matter

Question 23

Weight is typically measured on a

Answer 23

Spring scale

Question 24

As the force of gravity on an object increases

Answer 24

Weight increases

Question 25

SI standard unit for length is

Answer 25

Meyer

Question 26

1 km

Answer 26

1000 m

Question 27

To express shorter distances the

Answer 27

Cm is often used

Question 28

Combinations of SI units form

Answer 28

Derived units

Question 29

Derived units are produced by

Answer 29

Multiplying or dividing standard units

Question 30

Pascal

Answer 30

kg/ m x s^2

Question 31

Prefixed can also be added to express

Answer 31

Derived units

Question 32

Volume is the amount of

Answer 32

Space occupied by an object

Question 33

Derived SI unit of volume is

Answer 33

m^3

Question 34

One m^3=

Answer 34

Volume of a cube whose edges are 1 m long

Question 35

The cm^3 is often used to

Answer 35

Express the volume of materials in a chem lab

Question 36

m^3=

Answer 36

1000000 cm^3

Question 37

When chemists measures volumes of liquids and gases they often use

Answer 37

A non SI unit called the liter

Question 38

Liter=

Answer 38

1 decimeter cubed

Question 39

1 liter =

Answer 39

1000 cm cubed

Question 40

1000 mL=

Answer 40

1 L

Question 41

mL and cm^3 are

Answer 41

Interchangeable

Question 42

Density

Answer 42

Ratio of mass to volume

Mass/volume

Question 43

SI unit for density is derived from

Answer 43

Base units for mass and volume- kg and m^3- and can be expressed as
kg/m^3

Question 44

Density is often expressed as

Answer 44

g/ cm^3 it g/mL

Question 45

Densities of gas are generally expressed as

Answer 45

kg/m^3 or g/L

Question 46

Density is a characteristic

Answer 46

Physical property of a substance

Question 47

Density doesn’t depend on the size of the same because

Answer 47

As the samples mass increases, it’s volume increases proportionately, and the ratio of mass to volume is constant

Question 48

Density can be used as

Answer 48

A property to help identify a substance

Question 49

Density varies with

Answer 49

Temperature

Question 50

Most objects expand as temperature increases thereby

Answer 50

Increasing in volume

Question 51

Density usually

Answer 51

Decreases with increasing temperature

Question 52

A conversion factor is a

Answer 52

Ratio derived from the equality between two different units that can be used to convert from one unit to the other

Question 53

Each conversion factor equals 1 because the

Answer 53

2 quantities divided in any conversion factor are equivalent to each other

Question 54

Because conversion factors are equal to 1 they can be multiplied by other factors in equations

Answer 54

Without changing the validity of the equations

Question 55

Dimensional analysis

Answer 55

Mathematical technique that allows you to use units to solve problems involving measurements

Question 56

Quantity sought =

Answer 56

Quantity given x conversion factor

Question 57

It is always best to begin with an idea

Answer 57

Of the units you will need in your final answer

Question 58

Conversion factors can be derived if you know the

Answer 58

Relationship between the unit you have and the unit you want

Question 59

1 m

Answer 59

10 decimeters