Test Of 9/21/17

Question 1

What is a substance?

Answer 1

Chemical; matter that has a definite and uniform composition

Question 2

What are CFC’s?

Answer 2

Chlorine, flourine, carbon

Question 3

How is the ozone formed?

Answer 3

The ozone is formed when UV radiation strikes on an oxygen molecule causing it to split into two free oxygen atoms. The free atoms then collide with molecules of oxygen to form ozone molecules.

Question 4

What is a model?

Answer 4

A bisual, verbal, or mathematical explanation of experimental data

Question 5

What is quantitive data

Answer 5

It tells how much, how little, how little, how big, how tall, or how fast

Question 6

What is qualitative data?

Answer 6

Quality based on the five senses.

Question 7

What is a hypothesis?

Answer 7

An educated guess

Question 8

What is a theory

Answer 8

A theory is an explanation of a natural phenomenon based on many observations and investigations over time.

Question 9

What is a scientific law?

Answer 9

A relationship in nature that is supported by many experiments

Question 10

What is an independent variable?

Answer 10

The variable that is changed during the experiment

Question 11

What is a dependent variable?

Answer 11

Its value changes in response to a change in the independent variable.

Question 12

What is a control?

Answer 12

A standard for comparison

Question 13

What is a Conclusion?

Answer 13

A judgement based on the information obtained

Question 14

What is pure research?

Answer 14

Pure research is to gain knowledge for the sake of knowledge itself.

Question 15

What is applied research?

Answer 15

Research undertaken to solve a problem

Question 16

What is the independent and dependent variable in this situation? A teacher asks students how much sleep they got and what test scores they got.

Answer 16

Independent: how much a student sleeps

Dependent: their test scores

Question 17

What is the control in this situation? A person asks people how much coffee they consume and how it affects their appetite

Answer 17

Someone who drinks no coffee

Question 18

What are solids?

Answer 18

Solids have a definite shape and volume. They are matter

Question 19

What are liquids?

Answer 19

Liquids are a form of matter that flows, has a constant volume and takes the shape of its container.

Question 20

Gases

Answer 20

Form of matter that flows to conform to the shape of its container but also fills the entire volume of it.

Question 21

Vapor

Answer 21

THe gaseous state of a substance that is normally solid or liquid at room temperature

Question 22

What is a physical property?

Answer 22

A characteristic that can be observed or measured without changing the sample’s composition

Question 23

Extensive physical property

Answer 23

Dependent on the amount of substance present (mass)

Question 24

Intensive physical property

Answer 24

Independent of the amount of substance present

Question 25

What is a physical change?

Answer 25

The altering of a substance without changing its composition

Question 26

Phase change?

Answer 26

Transition from one state of matter to another

Question 27

Chemical change

Answer 27

One or more substances change into new substances

Question 28

During a chemical reaction what is conserved

Answer 28

Mass

Question 29

What is mass

Answer 29

The amount of matter in something

Question 30

What is weight

Answer 30

Amount of matter but also the effect of gravitational pull on that matter