chgo

Question 1

What is a standard in measurements?

Answer 1

An exact quantity used for comparison when measuring

Question 2

Define qualitative measurement.

Answer 2

Non-numeric form, related to quality or kind

Question 3

Define quantitative measurement.

Answer 3

Definite form usually in numbers, related to quantity

Question 4

What is the difference between accuracy and precision?

Answer 4

Accuracy refers to closeness to the true value; precision refers to consistency of measurements

Question 5

What is scientific notation?

Answer 5

Numbers expressed in a specific form, typically as a product of a number and a power of ten

Question 6

What are exact numbers?

Answer 6

Numbers obtained by counting or from definitions

Question 7

What are non-exact numbers?

Answer 7

Numbers obtained from measurements

Question 8

What are significant figures?

Answer 8

Digits believed to be correct by the person who made a measurement

Question 9

How many significant figures are in the number 1.3?

Answer 9

2 SF

Question 10

How many significant figures are in the number 0.0020?

Answer 10

2 SF

Question 11

When are zeros considered significant?

Answer 11

Zeros between non-zero digits, final zeros to the right of the decimal point

Question 12

What does the bar above a zero indicate?

Answer 12

The zero is significant

Question 13

How does scientific notation affect significant figures?

Answer 13

The significant figures in scientific notation are determined by the digits in the coefficient

Question 14

What is the rule for significant figures in addition and subtraction?

Answer 14

The last digit retained is determined by the position of the first doubtful digit

Question 15

What is the rule for significant figures in multiplication and division?

Answer 15

The answer contains no more significant figures than the least number of significant figures used

Question 16

What is the value in measurements?

Answer 16

A quantitative description that includes both a unit and a number

Question 17

What is the metric system?

Answer 17

The common system of reference units used in science, evolved into the International System of Units (SI units)

Question 18

What is the base unit for length in the International System of Measurement?

Answer 18

Meter (m)

Question 19

What is the base unit for mass in the International System of Measurement?

Answer 19

Kilogram (kg)

Question 20

What is the base unit for time in the International System of Measurement?

Answer 20

Seconds (s)

Question 21

What is the base unit for temperature in the International System of Measurement?

Answer 21

Kelvin (K)

Question 22

Define mass.

Answer 22

A fixed quantity independent of an object’s location

Question 23

Define weight.

Answer 23

The measure of the earth’s gravitational attraction for a body, varies with location

Question 24

What is density?

Answer 24

Defined as the mass per unit volume of a material

Question 25

What is specific gravity?

Answer 25

The ratio of the density of a substance to the density of water at 4°C

Question 26

What is the unit factor method also known as?

Answer 26

Dimensional Analysis

Question 27

What does the word 'atom' mean in Greek?

Answer 27

Invisible/uncuttable

Question 28

Who is known as the father of atomic theory?

Answer 28

John Dalton

Question 29

State one conclusion of John Dalton's atomic theory.

Answer 29

All matter is composed of tiny, invisible particles called atoms

Question 30

What happens to atoms during a chemical reaction according to Dalton's theory?

Answer 30

Atoms are rearranged to form new compounds; they are not created, destroyed, nor changed into atoms of any other element