c 1 how does science work? -...

Topic How does science work? How does science work? 111 Look, read and complete with the correct words.

Science Nounsgasliquidshapesizesolid

Science Verbschangefreezemeltpour

2 Look and complete with science verbs.

1 A has its own size, but it

takes the shape of its container, like when

you it into a glass.

2 A does not have its own

size or shape. It spreads out to fill the

whole container, like in a balloon.

3 These objects are different

.

4 These objects are different

.

5 A has its

own shape and size.

3 Match the words with the definitions.

1 change

2 freeze

3 melt

a to take a different form

b to change from a solid to a liquid

c to change from a liquid to a solid

1 Ice in the heat.

2 Water in the cold.

How Solids and Liquids Change

4 Lesson 1

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1 Complete the sentences with the science nouns.

1 First, scientists make a .

2 Next, they test the hypothesis in an .

3 Then, during the experiment, they collect .

4 Finally, they make a about the results.

2 Read and complete the table.

change changes do does doesn’t don’t

Science Nounsconclusiondataexperimenthypothesis

3 Read and circle the correct options.

Next, we put / puts it in the freezer.

Finally, the water freeze / freezes into ice.

First, we pour / pours the water into an ice tray.

A Number the stages in the correct order.

er.

s into ice.

nto an ice tray.

der.

Present Simple for FactsWe use the present simple for facts that are always true, such as scientific facts.

Affirmative

I change.

You change.

He/She/It (1) .

We (2) .

You change.

They change.

Negative

I (3) change.

You don’t change.

He/She/It doesn’t change.

We don’t change.

You don’t change.

They don’t change.

Interrogative

Do you change?

Yes, I (4) .

No, I don’t.

(5) he/she/it

change?

Yes, he/she/it does.

No, he/she/it (6) .

5Lesson 2


2 Look, read and circle.

A Write the correct verb forms.

1 Bert is a serious scientist. He (work) in a food laboratory. He

(make) sensible decisions. He always (wear) his

safety glasses. He (not mix) too many chemicals. It’s dangerous!

2 Matt and Mitt are mad scientists. They (work) at the same food lab. They

(make) interesting foods. They (not share) their secret

recipes. They (eat) some of their experiments for breakfast! It’s disgusting!

Then, she tests her hypothesis

in an .

,

she makes a conclusion.

The Scientific Method

,

a scientist asks a question.

,

she analyzes the data.

Next, she makes a

.

A Complete the sentences with the correct words.

after that experiment finally first hypothesis

Bert Matt Mitt

1 Number the stages in the correct order.

1 I pour / pours liquids

very carefully!

2 We doesn’t / don’t

follow the rules!

6 Lesson 3


100

1 Look and complete with the correct form of the

science verbs and nouns.

How Liquids and Gases Change

1 When water

, it

changes from a liquid state

to a gas.

2 Water at

100°C and evaporates. You

can see

rising up.

3 Water vapor in the air

into

drops of water on the

cold glass.

2 Read and circle the correct options.

1 Do / Does plants grow in the dark?

2 A scientist thinks that plants grow / grows in the dark.

3 The scientist plant / plants a seed in a pot. He doesn’t / don’t

put the plant pot in the sun. The pot sit / sits in a dark room.

4 Every day, the scientist measure / measures its height,

but the plant doesn’t / don’t grow.

5 He concludes that plants doesn’t / don’t grow in the dark!

A Match the steps in the scientific method with the sentences.

a record and analyze data b do an experiment c make a hypothesis

d make a conclusion e ask a question

3 Match the sentence halves.

1 Question: Does ice cream

2 Hypothesis: No, ice cream

3 Experiment: I put ice cream in

4 Data: The ice cream changes

5 Conclusion: Yes, ice cream

a doesn’t melt in the sun.

b a bowl in the sun.

c melts in the sun!

d melt in the sun?

e from a solid to a liquid.

Science Nounssteam

Science Verbsboilcondenseevaporate

7Lesson 4


1 Read the clues and complete the crossword.

Across

5 Scientists test a hypothesis by doing an…

7 This state of matter takes the shape of its

container and has a fixed volume.

8 This physical state doesn’t have a fixed

shape or volume.

9 Scientists test a … by doing

an experiment.

11 This instrument measures temperature.

13 Scientists collect …, or information, during

an experiment.

14 When a gas …, it becomes a liquid.

15 Liquids can … shape but not volume.

Down

1 After doing an experiment, scientists

make a…

2 When ice cream …, it changes from a solid

to a liquid.

3 When a liquid …, it becomes a solid.

4 Water … at 100°C.

6 When a liquid …, it becomes a gas.

10 This physical state has a fixed shape

and volume.

12 This means “to look at carefully.”

1 2

3

4

5 6

7

8 9 10

11

12 13

14

15

8 Lesson 5


1 Read and circle the correct answers.

1 A … expands to fill the whole space

in its container.

a solid

b liquid

c gas

2 A liquid … and becomes a solid.

a condenses

b freezes

c melts

3 Vapor in the air … on cold surfaces,

such as on glass.

a melts

b condenses

c evaporates

4 A … is an educated guess about

what will happen.

a hypothesis

b test

c conclusion

5 A solid has a fixed size and…

a color.

b data.

c shape.

6 … water boil below 100°C?

a Don’t

b Do

c Does

2 Read again and check your answers.

7 …, collect the materials you need. Next,

begin the experiment.

a First

b After that

c Finally

8 The scientist … liquid into a beaker.

a pour

b pours

c doesn’t pour

9 A scientist … temperature with a

thermometer.

a don’t measure

b measure

c measures

10 Water … boil below 100°C.

a does

b doesn’t

c don’t

11 What … use to measure temperature?

a you

b do you

c you do

12 Scientists … data during an experiment.

a record

b records

c do record

9Lesson 6


2 Look and label the lab equipment.

1 2 3 4

3 Match the sentence halves.

1 We use a microscope

2 We use a beaker to

3 We use a test tube

4 We use a cylinder

a to pour liquids.

b to hold small amounts of chemicals.

c to see small objects.

d to measure liquids.

1 Look, read and complete the sentences with lab equipment.

Lab Equipment beakercylindereyewashgloveslab coatmicroscopesafety gogglestest tube

Be Safe in the Lab!

First, put on a to

protect your clothes from any spills.

stop

most chemicals from

getting into your eyes.

In an emergency,

use an

station to rinse your eyes.

Wear to protect your

hands from harsh chemicals in the lab.

1

3

2

4

10 Lesson 7


3 Look at the pictures, read the captions and complete the conditional sentences.

1 If .

2 When .

1 Match the words with the definitions.

1 dissolve

2 float

3 sink

4 mix

a to combine two or more things

b to fall to the bottom of a liquid

c to mix thoroughly into a liquid

d to stay at the top of a liquid

2 Read and complete the table.

add boil changes dissolves drop floats melt put

Science Verbs dissolvefloatmixsink

Zero ConditionalThe zero conditional describes facts. Zero conditionals have two clauses: a condition clause with if or when and a present simple verb; and a result clause with a present simple verb. Use a comma between the clauses only when the condition comes first.

Condition Result

If you (1) ice cubes in a hot place, they (2) .

When you (3) water in a pot, it (4) to a gas.

Result Condition

Soap (5) if you (6) it in water.

Sugar (7) when you (8) it to coffee.

you put water into the freezer

it becomes solidyou see tiny

objects

1 2

you look into a microscope

11Lesson 8


1 What do the solids do in water? Write D (dissolve), F (float) or S (sink).

A Match the sentence halves.

1 If you put a toy boat in water, a when you drop them in water.

2 When you put a rock in water, b it dissolves.

3 Marbles sink c they sink.

4 An apple floats d it floats.

5 When you pour salt into water, e if you put it in water.

6 If you drop coins in water, f it sinks.

2 Look, read and mark (✓ or ✗).

If you mix oil and water,…

1 they both dissolve.

2 the water floats and the oil sinks.

3 the oil floats and the water sinks.

4 both the oil and the water float. Oil

Water

1 2 3

64 5

12 Lesson 9

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1 Unscramble the words to complete the sentences.

1 r k a e e b

You want to pour liquid into a container. You need a .

2 a b l t a c o

You don’t want any stains on your clothes. You need a .

3 t s t e t e b u s

You want to compare different colored liquids. You need a few .

4 y t s a e f s g e g l g o

You don’t want chemicals to get in your eyes. You need a pair of .

5 l y r e d n i c

You want to measure a liquid. You need a .

6 e p m i o r c c s o

You want to look at bacteria and other tiny things. You need a .

7 s l e g v o

You don’t want any chemicals to touch your hands. You need a pair of .

8 s h e e w a y

Oh, no! You got a few drops of a chemical in your eyes. You need an !

2 Cross out the incorrect verb forms. Write the correct forms below.

1 When water evaporated, it slowly changes from a liquid to a gas.

2 When water condenses, the gas form of water change to a liquid.

3 When the temperature is 100°C, water boiled.

4 Limes sink if you will put them in water.

5 Snow melt if the temperature is warm.

13Lesson 10


1

2

3

4

5

1 To mix thoroughly into a liquid.

2 To combine two different liquids.

3 To fall to the bottom of a liquid.

4 To stay at the top of a liquid.

5 A container for pouring liquid in the lab.

1 Circle the odd words out.

1 beaker test tube

cylinder eyewash

3 balloon triangle

circle rectangle

5 large medium

square small

2 gloves safety goggles

microscope lab coat

4 water ice

juice milk

6 freeze melt

boil measure

2 Read the clues and complete the crossword.

A Unscramble the letters in circles to answer the question.

Q: Salt dissolves in water. But what happens if you stir the water or add heat?

A: The salt dissolves .

14 Lesson 11


1 Read and circle the correct answers.

1 Plastic glasses that you wear for protection in the lab are…

a eyewashes. b gloves. c safety goggles.

2 A lab coat protects your … from any spills.

a eyes b clothes c hands

3 You can use a … to measure liquids in the lab.

a microscope b cylinder c test tube

4 You usually use a microscope to…

a see very tiny things. b be safe in the lab. c hold a liquid.

2 Look, read and circle the correct answers.

5 Which dissolves in water?

a A lemon. b A stone. c Sugar.

6 Which sinks in water?


7 Which floats in water?


3 Read and circle the correct sentences.

8 a Invisible ink becomes visible when you hold a lamp near to it.

b Invisible ink became visible when you will hold a lamp near to it.

9 a If the temperature is very cold, a liquid changing to a solid.

b If the temperature is very cold, a liquid changes to a solid.

10 a Ice cubes float if you put them in a glass of water.

b Ice cubes will float if you will put them in a glass of water.

4 Read again and check your answers.

15Lesson 12

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c 1 how does science work? -...

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