Chapter 1 & 2 Test Review

Question 0

Pure science is best defined as the _____.

Answer 0

Continuing search for new knowledge.

Question 1

Technology can best be defined as ______.

Answer 1

Applied science

Question 2

What do scientists who do pure science do?

Answer 2

They do experiments to find out about the world.

Question 3

A scientific model is a _______.

Answer 3

Representation of a real event or object.

Question 4

The first step in the scientific method is usually

Answer 4

Making an observation.

Question 5

What does it mean to say that “no experiment is a failure”?

Answer 5

All experiments are observations of real events

Question 6

Matter is defined as anything that

Answer 6

Has mass and takes up space.

Question 7

The science of what matter is made of and how it changes is called _____.

Answer 7

Chemistry.

Question 8

The smallest unit of a substance that behaves like the substance is _____.

Answer 8

An element.

Question 9

You put 1 gram of salt into 1 liter of water and stir. The resulting liquid is an example of _____.

Answer 9

A homogenous mixture.

Question 10

The chemical symbol for sulfuric acid is H^2SO^4. How many atoms are contained in each molecule of sulfuric?

Answer 10

7

Question 11

The chemical formula for water, H^2O, means that each water molecule contains _____.

Answer 11

Two hydrogen atoms and one oxygen atom.

Question 12

Which of the following is an example of a physical change?

Answer 12

Dissolving salt in water.

Question 13

Digesting food is an example of _____.

Answer 13

Chemical change

Question 14

How many significant figures are in the number:

2000

Answer 14

1

Question 15

How many significant figures are in the number:

2000.

Answer 15

4

Question 16

How many significant figures are in the number:

0.002

Answer 16

1

Question 17

How many significant figures are in the number:

2.000

Answer 17

4

Question 18

How many significant figures are in the number:

0.200

Answer 18

3

Question 19

How many significant figures are in the number:

2002

Answer 19

4

Question 20

How many significant figures are in the number:

20 x 10^2

Answer 20

1

Question 21

Describe the relationship between science and technology, and give an example of how they are related.

Answer 21

Science is the study of objects and how they work. Technology is how we use that knowledge. You can use science to observe and test your experiment. You use technology to help figure out things in science.

Question 22

What does it mean to say that “no experiment is a failure”? Do you agree or disagree? Why?

Answer 22

No experiment is a failure means that no experiment is p for nothing. I agree even if your experiment did not go as planned you are still learning something new.

Question 23

Why are organizing and presenting data important scientific skills?

Answer 23

Organizing and presenting data are important skills because they show and prove what happen in the experiment. Data can be used to see if a hypothesis is correct or not.

Question 24

“Carbonated drinks are homogenous mixtures.” Explain this statement.

Answer 24

Carbonated drinks are homogenous mixtures because they are the same throughout, they never change.

Question 25

How can water be classified as both a pure substance and a heterogenous mixture at the same time. List an example of each.

Answer 25

If water is referred to as H2O, it is a pure substance because you know exactly whats in it. If water is just referred to as water it is heterogenous because it could be well water, city water, spring water, vitamin water and so on.