5th - Science U2 - Study Guide

Question 0

What is needed for a substance to change states

Answer 0

A change in temperature

Question 1

What are the three common states of matter

Answer 1

Solid, liquid, gas

Question 2

What happens to the particles in a substance as the substance changes states

Answer 2

Particles and objects move around so when they change state, they change how far or close together they are.

solids - particles only vibrates and are very close together
Liquids - particles vibrate as they move past one another and are far apart
gases - particles move quickly and are the farthest apart

Question 3

Explain what happens to the particles in a solid as it melts to a liquid

Answer 3

When a Solid gains enough heat, it’s particles start moving too fast to stay together. The close particles move apart. A solid then changes into a liquid.

Question 4

Condensation

Answer 4

Changing of a gas to a liquid

Question 5

Melting

Answer 5

When a solid changes to a liquid as a result of adding heat

Question 6

Freezing

Answer 6

When a liquid changes to a solid by removing heat

Question 7

Evaporating

Answer 7

Change of a liquid into a gas below the boiling point

Question 8

Know the he “How matter can change state” diagram (p 54)

Answer 8

SOLID < (freeze) < LIQUID < (Condense) < GAS

SOLID > (Melt) > LIQUID > (evaporate) > GAS

Question 9

What are examples of boiling points of metals and nonmetals

Answer 9

The boiling point of copper is 2567°C
the melting point of copper is 1083°C

The boiling point of iron is 2861°C
the melting point of iron is 1538°C

The boiling point of water is 100°C
The melting point of water is 0°C

Boiling point of table salt is 1465°C
The melting point of table salt is 801°C

Question 10

What are the boiling points of metals and nonmetals?

Answer 10

?????

Question 11

Do water molecules take up more space as a solid than as a liquid

Answer 11

Yes

Question 12

What is more dense than liquid water or solid water?

Answer 12

Liquid water is more dense than ice

Question 13

What are the signs of a chemical change

Answer 13

A chemical change takes place when atoms link together in new ways to create substances different from the original substances. Signs of a chemical change are: changes in color, forms tarnish, releases gas, forms of precipitate, releases energy

Question 14

Be able to tell the difference between a chemical or physical change with examples given

Answer 14

A physical change is only a change of state. Ex: water is still water when it changes from a solid to a liquid then a gas.

A chemical change is when a material changes into something different Ex: vinegar changes into something else when you add baking soda to it. The bubbles from a chemical reaction and create a solid called sodium acetate

Question 15

Which elements combine to make rust

Answer 15

Water helps iron in the car and oxygen in air change interest. The materials involved in the chemical reaction are iron, oxygen, and water

Question 16

Does a compound have different properties in the properties that found it (or made it up)?

Answer 16

Yes

Question 17

Be able to tell how many atoms a compound has by looking at the formula or the chemical name (P67) / 70

Answer 17

X

Question 18

Why do scientists use chemical equations

Answer 18

Chemical equations keep track of which substances are used, and in what ratio. The number in front of the chemical formula tells how many of those molecules are used

Question 19

What is “The law of conservation of mass”?

Answer 19

The total mass of the reactants equals the total mass of the products in a chemical reaction. In other words, both sides of the equation must be equal and have the same number of molecules on each side.

Question 20

Be able to pick out the reactants and the products from the chemical equation p67/ 70

Answer 20

X

Question 21

Photosynthesis vs Respiration

Answer 21

Photosynthesis 6 CO2 + 6 H2O > C6 H12 O6 + 602
Carbon Dioxide + water > glucose + oxygen

Respiration. C6 H12 O6 + 602 = 6CO2 + 6 H2O
Glucose + oxygen > carbon dioxide + water

Question 22

Respiration and Photosynthesis

Answer 22

Respiration is the release of energy from food and it is a chemical reaction
Photosynthesis is the food making process and green plants and it is a chemical reaction

Question 23

What is the difference between photosynthesis and respiration

Answer 23

Photosynthesis makes food while respiration releases energy from food