Measurements in Chemistry

Question 1

Measurements are an important tool used by scientists to understand matter
True or false?

Answer 1

True

Question 2

Does a qualitative observation use numbers

Answer 2

No, it uses senses and is expressed using words rather than numbers

Question 3

A_______ is produced when a quantitative observation or measurement is made

Answer 3

Number

Question 4

To completely describe a substance one or more___________ measurements must be used.

Answer 4

Quantitative

Question 5

Measurements always have a_______ and a________.

Answer 5

Number, unit

Question 6

Is a measurement useful without a unit?

Answer 6

No

Question 7

True or false?
Measurements can be made using any units

Answer 7

True

Question 8

Which system is used for scientific measurements?

Answer 8

Metric

Question 9

What are the units for the following quantitative measurements?
22.4 liters, 55 meters, 48 minutes

Answer 9

Liters, meters, minutes

Question 10

How many basic units are there for each type of measurement in the metric system?

Answer 10

1

Question 11

What are the abbreviations for liter and gram?

Answer 11

L, g

Question 12

A______ is used to indicate how smaller and larger units in the metric system relate to the basic unit

Answer 12

Prefix

Question 13

How much smaller is a millimeter than a meter?

Answer 13

1/1,000

Question 14

How many centigrams are there in 1g

Answer 14

100

Question 15

True or false
There’s always an uncertainty or error associated with any measured number.

Answer 15

True

Question 16

_________ are numbers that do not have uncertainties associated with them.

Answer 16

Exact numbers

Question 17

The measure of how closely individual measurements agree with each other

Answer 17

Precision

Question 18

How close the individual measurements are to the true value?

Answer 18

Accuracy

Question 19

The terms_______and_______are used to discuss the uncertainties in measured numbers

Answer 19

Precision, accuracy

Question 20

What does the prefix nano denote in the metric system?

Answer 20

One- Billionth

Question 21

What does the prefix micro denote in the metric system

Answer 21

One-Millionth

Question 22

What does the prefix deci denote in the metric system?

Answer 22

One-tenth

Question 23

What does the prefix kilo denote in the metric system?

Answer 23

1,000

Question 24

What does the prefix mega denote in the metric system?

Answer 24

One million

Question 25

What does the prefix giga denote in the metric system?

Answer 25

1 billion