8sw1 Yearly Science Exam

1. Food is a source of:

Electrical energy

Chemical energy

Kinetic energy

Thermal energy

2. Fossil fuels began forming millions of _____ ago. At the time when it is believed that dinosaurs roamed the _____ , forests of trees fell into swamps and were covered by silt and _____ . They gradually changed into the coal, _____ and natural _____ that we use today. The advantages of using fossil fuels are that they are readily available at the present time and are _____ . They can also be used for many purposes e.g. coal can be _____ in power stations to make _____ and also in homes for _____ . These fossil _____ took millions of years to form, yet humans are using them rapidly in cars, power _____ the disadvantages of fossil fuels is that they will run out, and also that they are _____ .

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3. The law of _____ of energy states that energy cannot be _____ or _____, but can only _____ forms. There are many different forms of energy. Potential energy is _____ energy and kinetic energy is the energy of _____. Take for example the motion of a roller coaster on its tracks: at the _____of the loop, the roller coaster has high potential energy. At the _____ of the loop, it has high kinetic energy. If energy is conserved why does the roller coaster eventually slow down and stop at the bottom of the roller? That's because the force of friction changes the kinetic energy into _____ and _____ energy, especially when the brakes are applied. As the roller coaster moves around the track, its potential and kinetic energy change back and forth.

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4. Most of the worlds electricity comes from the burning of:

Alcohol

Coal

Oil

Natural gas

5. A natural fuel formed in the geological past from the remains of living organisms is known as:

A fossil fuel

Solar energy

Geothermal

Biomass

6. What is the main disadvantage of a coal fired power plant?

It is a non-renewable energy source

It is a renewable energy source

It is cheap

It is relatively easy to obtain

7. In the picture shown, what is represented by line A?

Atomic number

Atomic mass

Number of protons

The group number

8. All atoms are made up of what 3 basic components?

Nucleus, protons and electrons

Ions, protons and electrons

Electrons, protons and neutrons

Elements, compounds and mixtures

9. The chemical formula for the compound salt is NaCl. Salt contains the elements:(hint = use the picture shown)

Sodium and carbon

Sodium and chlorine

Chlorine and nitrogen

Nitrogen and carbon

10. Potential Energy (PE) is:

The energy caused by the movement of an object

Energy that is stored (like compressed springs)

The energy that is used when a light is switched on

The energy released when a runner gets hot

11. What is the main advantage of wind power?

It does not work unless there is wind

It is a renewable energy source

It uses large turbines

In no way does it harm the ecosystem

12. Is the picture shown a physical or chemical change?

Physical

Chemical

13. In the picture shown, what does the box labelled C represent?

Pure Element –only one typeof atom present

Mixture of two elements –two types of uncombined atoms present.

Pure compound –only one type of compound present

Mixture of two compounds –two types of compounds present

Mixture of a compound and an element.

14. Plants obtain the energy to make food from:

Water

Air

Soil

The sun

15. Is the picture shown a physical or chemical change?

Physical

Chemical

16. Is the picture shown a physical or chemical change?

Physical

Chemical

17. In the table shown which letter best describes the characteristics of a metal?

A

B

C

18. In the picture shown, which line represents the symbol for the element?

B

A

C

D

19. Which of the following is a fossil fuel?

Oil

Iron ore

Solar energy

Hydrogen

20. In the table shown which letter best describes the characteristics of a non-metal?

A

B

C

21. Which of these resources is non-renewable?

Natural gas

Wind

Solar energy

Hydroelectricity

22. The particle of an atom with a positive charge is known as the:

Neutron

Proton

Electron

Particle

23. Which of the following is NOT a chemical change?

Burning a match

Dissolving sugar in tea

Ripening of a banana

Cooking a cake

24. Is the picture shown a physical or chemical change?

Physical

Chemical

25. In the picture shown, what does the box labelled B represent?

Pure Element –only one typeof atom present

Mixture of two elements –two types of uncombined atoms present.

Pure compound –only one type of compound present

Mixture of two compounds –two types of compounds present

Mixture of a compound and an element.

26. In the picture shown, what does the box labelled A represent?

Pure Element –only one typeof atom present

Mixture of two elements –two types of uncombined atoms present.

Pure compound –only one type of compound present

Mixture of two compounds –two types of compounds present

Mixture of a compound and an element.

27. This image shows which method of heat transfer:

Conduction

Convection

Radiation

Thermal energy

28. An element be broken down into a simpler substance

True

False

29. This image shows which method of heat transfer:

Conduction

Convection

Radiation

Thermal energy

30. In which situation below is heat being transferred mainly by radiation?

From a hot clothes iron to your hand held close to it

From hot plate on the stove to the soup in the saucepan

From a hot car door to your hand placed on the metal

From a hot drink to the end of a metal spoon used to stir it

31. The particles that move around the nucleus of an atom are called:

Neutrons

Protons

Electrons

Ions

32. Coal stores energy. The energy originally came from:

The Earth

The sun

Chemicals

Rocks

33. Batteries are stores of:

Electrical energy

Chemical energy

Kinetic energy

Acidic energy

34. Match the following definitions to the correct term

two or more atoms chemically bonded

contains atoms of only one type

contains two or more substances not chemically bonded

any substance that is consumed or used up during the reaction

substance that is produced by a chemical reaction

any substance that has mass and occupies space

The rows running ACROSS the periodic table

the columns running DOWN the periodic table

Substances that are solid, shiny and good conductors

elements that are poor conductors and usually brittle

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35. Match the descriptions below to the correct energy type

energy in moving objects

energy from the heat of the Earth

energy in objects because of their height

energy from inside atoms

energy inside fuel and explosives

energy from the sun

energy carried by radio waves, microwaves and light

energy caused by the change in temperature of an object gaining kinetic energy

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36. Match the correct energy type to the transformations shown in the picutre

A

B

D

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37. Match the following letters to their correct labels using the picture shown

a

b

c

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