Unit 9

Question 1

Physical changes(4)

Answer 1

Boiling, crashing, melting, or filtering

Question 2

Chemical changes

Answer 2

Passing an electric current through it or burning it

Question 3

Physical properties

Answer 3

Boiling point, melting point, hardness, color, texture, and density(d=m/v)

Question 4

Chemical properties

Answer 4

We activity with acid and other elements, and flammability

Question 5

What can you live without

Answer 5

An atmosphere

Question 6

What is the most important thing that you can’t live without

Answer 6

Water

Question 7

How do I remember the most common elements on earth

Answer 7

Chopkin’s Cafe has mighty good salt

Question 8

How are molecules formed

Answer 8

Went two or more atoms are joined chemically by sharing electrons are giving up or receiving electrons

Question 9

Compound

Answer 9

A molecule that contains at least two different elements

Question 10

C6H12O6 forms what

Answer 10

Sugar AKA glucose

Question 11

NaHCO3

Answer 11

Baking soda

Question 12

H2O2

Answer 12

Hydrogen peroxide

Question 13

H2O

Answer 13

Water

Question 14

What four things do living things need to survive

Answer 14

Energy source, water, air, and a place to live

Question 15

Photosynthesis

Answer 15

When carbon dioxide and water are converted to glucose and oxygen

Question 16

Earth rotation

Answer 16

Earth spins on its axis making a complete rotation every 24 hours which allows most of earths regions to receive regular amount of sunlight

Question 17

What is the most important component of the solar system

Answer 17

The sun

Question 18

What percent of the solar systems mass does the sun contain

Answer 18

99.8%

Question 19

Since the sun takes up 99.8% of the solar systems mass, the remaining .2% makes up…..

Answer 19

Planets, moons, dwarf planets, astroids, meteors, and comets

Question 20

The sun provides most of the heat, white, and other energy which makes

Answer 20

Life possible on earth

Question 21

The Earth’s location, and reference of the sun, enables it to:

Answer 21

Maintain liquid water

Question 22

If earth were closer to the sun what would happen to the water

Answer 22

The water would evaporate

Question 23

If earth were too far away from the sun what would happen to the water

Answer 23

It would freeze

Question 24

What is earths average temperature

Answer 24

59°F

Question 25

What is the key to the world weather

Answer 25

Sun

Question 26

Why is water important for life(3)

Answer 26

Transports vital substances, oceans help with climate, it takes a lot of energy to raise the temperature of water even a few degrees

Question 27

Deep-sea vents can reach over

Answer 27

650°F

Question 28

What happens if you add pressure to water

Answer 28

You can raise its boiling temp

Question 29

Since water can undergo extreme variations, what it happen

Answer 29

It wouldn't freeze or boil away

Question 30

What happens when water expands

Answer 30

It becomes less dense

Question 31

Three reasons why the atmosphere is necessary

Answer 31

1. Greenhouse gases trap temp 2. protects from harmful radiation 3. Thickness of an atmosphere depends on gravity

Question 32

What does stronger gravity equal

Answer 32

Stronger gravity equals thicker atmosphere

Question 33

What type of air does the atmosphere consist of

Answer 33

Dry air

Question 34

How much nitrogen and oxygen does the earth have

Answer 34

Nitrogen 78% | Oxygen 21%

Question 35

How much argon carbon dioxide and water vapor does the earth have

Answer 35

Argon 1% CO2 .04% Water vapor 1%

Question 36

Since the ozone layer protects the earth, what does a block

Answer 36

It blocks most UV radiation before it reaches the earths surface

Question 37

Orbit

Answer 37

The path a body follows as it travels around another body in space

Question 38

Solar system

Answer 38

Collection of small and large bodies which orbit a central star

Question 39

Do dwarf planets orbit the sun

Answer 39

Yes

Question 40

Element

Answer 40

Pure substance in which all the particles are alike

Question 41

Gravity

Answer 41

The force of objects due to the masses and differences between them

Question 42

Earths gravity causes what to orbit the earth

Answer 42

Moon

Question 43

Weightlessness

Answer 43

Apparent loss of weight of a freefalling object due to gravity

Question 44

Long term effects of weightlessness

Answer 44

Muscles and bones in the legs and lower back weeken

Question 45

Radiation

Answer 45

Electromagnet radiation, along with highly charged particles can damage DNA and tissues-causing cancer

Question 46

Meteoroids

Answer 46

They move at high speeds which cause serious damage if they collide with spacecraft or astronaut working outside of spacecraft

Question 47

What two things are supplied to the spacecraft cabin crew

Answer 47

Oxygen and air pressure

Question 48

In a space craft what happens to the waste

Answer 48

For liquid waste is recycled in the solid waste is compressed and stored

Question 49

And a spacecraft, how is the food package

Answer 49

Freeze dried

Question 50

How do they drink liquids in the spacecraft

Answer 50

They use zero gravity cups and straws

Question 51

Outer layer of a spacesuit

Answer 51

Strong fabric which reflect sunlight

Question 52

Inner layers of a spacesuit

Answer 52

Keep astronauts cool by removing body heat and sweat

Question 53

Special joints in the fabric permit for what

Answer 53

Bending

Question 54

Safety tethers

Answer 54

Used to attach to spacecraft when working outside

Question 55

As one of the long-term effects for weightlessness what happens to the spine

Answer 55

The length increases

Question 56

As another long-term effect of weightlessness what happens to the heart

Answer 56

The heart weekens because it doesn't have to work as hard

Question 57

What can radiation cause

Answer 57

Damage to DNA and tissues which can cause cancer

Question 58

Helmet

Answer 58

Reflect and reduce glare