Unit 1 Vocab

Question 1

Atom

Answer 1

The smallest particle that contains the properties of an element

Question 2

Element

Answer 2

Substance composed of atoms that cannot be broken down into simpler parts

Question 3

Acid

Answer 3

Substance that contributes hydrogen ions to a solution

pH = below 7

Question 4

Base

Answer 4

Substance that contributes hydroxide ions to a solution

pH = above 7

Question 5

pH

Answer 5

The # that indicates relative strength of of acids and bases in a substance

Question 6

Potential Energy

Answer 6

Stored energy that has not been released

Question 7

Kinetic Energy

Answer 7

The energy of motion

Question 8

Joule

Answer 8

Amount of energy used when a 1-watt electrical device is used for 1 second

Question 9

Power

Answer 9

The rate at which work is done

energy= power x time
power= energy / time

Question 10

Open System

Answer 10

A system in which exchanges of matter and energy occur across system boundaries

Question 11

Closed System

Answer 11

A system in which matter and energy exchanges do not occur across boundaries

Question 12

Feedback loop

Answer 12

Positive: a feedback loop in which change in a system is amplified

Negative: a feedback loop in which the system responds to a change by returning to its original state, or by decreasing the rate of change