Unit 1 Science test

Question 1

What are the parts of an atom and what are their changes

Answer 1

protons +
neutrons 0
electrons -

Question 2

describe where most of the mass is found in the atom

Answer 2

Nucleas

Question 3

What does neutrons do

Answer 3

give more mass

Question 4

Freya

Answer 4

freya

Question 5

Explain how an atom could have a net charge of negative

Answer 5

Negative: more electrons than protons

Question 6

Explain how an atom could have a net charge of positive

Answer 6

Positive: more protons than electrons

Question 7

how many electrons can fit into the 1st energy level

Answer 7

2

Question 8

how many electrons can fit into the 2nd energy level

Answer 8

8

Question 9

how many electrons can fit into the 3rd energy level

Answer 9

18

Question 10

how many electrons can fit into the 4th energy level

Answer 10

32

Question 11

what are substances called that contain only one type of atom

Answer 11

Elements

Question 12

Describe what a valence electron is

Answer 12

Electrons in the outermost shell/ energy level

Question 13

describe what a physical property is…

Answer 13

it can be observed or measured without changing the identity of the substance

Question 14

Give 2 examples of a physical property

Answer 14

color and odor

Question 15

describe what a chemical property is…

Answer 15

Information that tells you how a substance forms a new substance by combining with something else

Question 16

give 2 examples of chemical properties

Answer 16

Baking soda + vinegar
rust on a nail

Question 17

Elements in the same row or period have what in common?

Answer 17

The same number of energy levels

Question 18

What do elements in the same column have in common

Answer 18

Same number of Valence electrons

Question 19

Give 3 characteristics of a physical change

Answer 19

Color, Shape and Size

Question 20

give an example of a physical change

Answer 20

ripping paper

Question 21

Give 3 characteristics of a chemical change

Answer 21

red paint + blue paint
baking soda + vinegar
White frosting + blue dye

Question 22

Give an example of chemical change

Answer 22

catch on fire

Question 23

Define the Law of Conservation of matter/energy

Answer 23

energy can neither be created nor destroyed