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Worksheets

Lesson - 2 Materials

Total questions: 50

Worksheet time: 48mins

Name
Class
Date
1.

Which of these pairs represents the reactants of photosynthesis?

a)

Oxygen and water

b)

Glucose and oxygen

c)

Water and glucose

d)

Carbon dioxide and water

2.

Which of these pairs represents the products of photosynthesis?

a)

Oxygen and water

b)

Glucose and oxygen

c)

Water and glucose

d)

Carbon dioxide and water

3.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
4.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
5.
What is the right part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
6.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
7.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
8.

Frying an egg...Is it a chemical change or physical change?

a)
Chemical Change
b)
Physical Change
9.

What is a reversible change?

a)

a process in which NO new materials are made and which can be reversed. Just a change of state occurs.

b)

A reaction that makes new substances and cannot be reversed. Usually involving heating, bubbling or fizzing.

10.

What is an irreversible change?

a)

a process in which NO new materials are made and which can be reversed. Just a change of state occurs.

b)

A reaction that makes new substances and cannot be reversed. Usually involving heating, bubbling or fizzing.

11.

When ice melts in the sun, is that change reversible or irreversible?

a)

reversible

b)

irreversible

12.

When you burn logs from trees, is that change reversible or irreversible?

a)

reversible

b)

irreversible

13.

When you boil water on the stove, is the change reversible or irreversible?

a)

reversible

b)

irreversible

14.

Mrs. Kelly made cupcakes with pink icing. When she baked the cupcakes, was the change reversible or irreversible?

a)

reversible

b)

irreversible

15.

Ms Luke places baking soda in vinegar and it creates a lot of bubbles. Is this change reversible or irreversible?

a)

reversible

b)

irreversible

16.

water vapor turns into water droplets

a)

reversible

b)

irreversible

17.

Ms. Murphy leaves her milk cartons outside in winter. The milk freezes solid! Is this change reversible or irreversible?

a)

reversible

b)

irreversible

18.
Which of these is NOT a reversible change?
a)
Water to Ice
b)
Juice to Popsicle
c)
Cookie Dough to Cookie
d)
Melting Chocolate
19.

When a substance changes from a solid to a liquid, this is called...

a)

Melting

b)

Evaporation

c)

Freezing

d)

Condensation

20.

When a substance changes from a liquid to a gas, this is called...

a)

Melting

b)

Evaporation

c)

Condensation

d)

Freezing

21.

When a substance changes from a liquid to a solid, this is called...

a)

Melting

b)

Evaporation

c)

Condensation

d)

Freezing

22.

Water is the univeral ____.

a)

solute

b)

solvent

c)

solution

23.
What is a solute?
a)
The substance that does the dissolving in a solution.
b)
The substance that is dissolved into the solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
24.
What is a solvent?
a)
The substance that does the dissolving in a solution.
b)
The substance that is being dissolved in a solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
25.

Fish breathe oxygen, which is dissolved in water. Is the oxygen the fish breathe considered to be the solute or solvent?

a)

Solute

b)

Solvent

26.

You make a pitcher of lemonade by adding lemon juice, sugar, ice and water. Which of the following are the 2 solutes in the solution?

a)

Lemon juice

b)

Sugar

c)

Water

d)

Lemon seeds

27.

Solutes dissolve quicker in _________ water.

a)

cold

b)

warm

28.

Solutes dissolve quicker if you stir them.

a)

true

b)

false

29.

If I dissolve carbon dioxide in water, what is the solvent?

a)

Carbon Dioxide

b)

There is no solvent

c)

Oxygen

d)

Water

30.
Which is an example of a solute?
a)
Milk
b)
Sugar
c)
Water
d)
Ginger Ale
31.
Which is an example of a solvent?
a)
Salt
b)
Iced Tea mix
c)
Water
d)
Sugar
32.
When a liquid reaches the temperatures of its ___, it can become a gas.
a)
melting point
b)
freezing point
c)
boiling point
d)
density
33.

Melting Point of ice is

a)

100 degrees Celsius

b)

0 degrees Celsius

c)

0 degrees Fahrenheit

34.
The temperature when a solid changes to a liquid - 
a)
melting point
b)
freezing point
c)
boiling point
35.
What is the boiling point of water
a)
0 C
b)
100 F
c)
50 C
d)
100 C
36.

A substance has a melting point of 25 oC and a boiling point of 235 oC. What state is it at 5oC?

a)

Solid

b)

Liquid

c)

Gas

37.

If you boil water in a pot, some of the water becomes...

a)

water vapor

b)

precipitation

c)

evaporation

38.

The melting and boiling point of a substance are physical changes.

a)

true

b)

false

39.

All substances have the same melting and boiling points

a)

false

b)

true

40.
___________________ is a measure of how hot or cold something is
a)
Humidity
b)
Temperature
c)
Water
d)
Precipitation
41.

Temperature has an effect on the speed a solid dissolves in water.

a)

True

b)

False

42.

Hot water makes a solid ___________________.

a)

dissolve faster

b)

dissolve slower

c)

not dissolve

43.

Cold water makes a solid ___________________.

a)

dissolve faster

b)

dissolve slower

c)

not dissolve

44.

Sand dissolves in water.

a)

True

b)

False

45.

Substances that do not dissolve in water are called ...................

a)

soluble

b)

insoluble

c)

solution

46.

Substances that dissolve in water are called ...................

a)

soluble

b)

insoluble

c)

solution

47.

Which will dissolve faster? Crushed table salt or a cube of table salt. Assume they have an equal mass.

a)

crushed table salt

b)

crystal of table salt

48.

What combination would dissolve a solid solute the fastest?

a)

high temperature, no stirring

b)

no heat, no stirring

c)

sugar cube, no heat

d)

high temperature, stirring

49.

John has three cups of sugar particles. Cup 1 has large sugar particles, Cup 2 has medium-sized particles, and Cup 3 has small sugar particles. If John pours each cup in water, which cup of sugar particles will dissolve the fastest?

a)

Cup 1 will dissolve the fastest.

b)

Cup 2 will dissolve the fastest.

c)

Cup 3 will dissolve the fastest.

d)

They will dissolve at the same rate.

50.

Jackson is making dinner and is trying to dissolve salt into a pot of water. The salt is dissolving slowly. What should Jackson do to speed up the rate of dissolving?

a)

He should put larger salt particles in the water.

b)

He should heat the water to a higher temperature.

c)

He should completely stop stirring the pot of water.

d)

He should slow down the speed he is stirring the pot.

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