HOMEWORK BOOKLET Year 8/9 Science

OCTOBER 19, 2018 NAME: __________________

Sattler Christian College

Year 8/9 science homework questions

Week 2

10.1 Heat: Energy in transit

1. Which form of energy do particles transfer to each other as heat flows through a conductor?.

2. Explain why solids such as polystyrene foam and wool are poor conductors of heat.

3. Explain why air near a wall furnace rises when it gets warmer.

4. What is a convection current?

5. Which form of electromagnetic radiation from the sun is responsible for most of the radiant

heat reaching the Earth?

Year 8/9 science homework questions 6. List three things that can happen to radiant heat when it arrives at any surface.

Extension

7. Identify the features of a vacuum flask that reduce heat transfer

Note: (drawing in details from the template provided may help):

a) conduction

b) convection

c) radiation.

Year 8/9 science homework questions Week 3

10.3 Electricity in transit

1. Explain the difference between the transfer of electrical energy in a bolt of lightning and the transfer of electrical energy in an electric circuit.

2. What are the three essential features of all electric circuits?

3. Contrast what electric current is a measure of with what voltage is a measure of.

4. What is the purpose of a switch in an electric circuit?

5. Why are connecting wires usually made of copper?

Year 8/9 science homework questions 6. Draw a circuit diagram showing:

a) A cell connected to two light globes connected in series

b) A cell connected to two light globes connected in parallel.

7. Why is voltage also known as potential difference?

Year 8/9 science homework questions Week 4

10.6 Scale of measurement: Made to measure

Probing a simple circuit Investigation

AIM: To investigate the current and voltage within an open and closed circuit

Materials:

power supply (set to 6 volts)

6-volt light globe and holder

6 connecting leads with alligator clips or banana plugs

very long connecting lead (at least 2 m long)

switch

ammeter

voltmeter

METHOD

1. Set up the circuit shown in the diagram below. You should be able to set it up using only three connecting leads. Make a copy of the table below in which to record your measurements.

Probing a simple circuit

Part A (closed circuit)

Using the ammeter Using the voltmeter

Location in circuit Electric current (mA) Item Voltage (V)

Switch closed A Power supply

B Light globe

C Switch

D Connecting lead

Year 8/9 science homework questions Use the ammeter to measure the electric current at each of the points A, B, C and D.

2. Record your measurements in the table.

CAUTION

Check that the ammeter is connected properly before closing the switch. Ask your teacher if you are not sure.

Remove the ammeter from the circuit.

3. With the switch closed, use the voltmeter to measure the voltage across: o – the power supply (across points A and D) o – the light globe (across points B and C) o – the switch (across points C and D) o – one of the connecting leads (across points A and B).

DISCUSS AND EXPLAIN

4. Is there any difference between the amount of current travelling through the points A, B, C and D?

5. How does the voltage across the terminals of the power supply compare with the voltage across the light globe when the switch is closed?

6. Where is most of the electrical energy generated by the power supply lost?

Year 8/9 science homework questions

Part B (open circuit)

Before you connect the ammeter, make a prediction of the electric current (mA) at each of the four points.

Using the ammeter Using the voltmeter

Location in circuit

Prediction (mA)

Reading (mA)

Item Prediction (V)

Voltage (V)

Switch open

A

Power supply

B

Light globe

C

Switch

D

Connecting lead

7. With the switch open, use the ammeter to measure the electric current at each of the points A, B, C and D.

Before you connect the voltmeter, make a prediction of the voltage (V) across each of the four items.

8. With the switch open, use the voltmeter to measure the voltage across: o – the power supply (across points A and D) o – the light globe (across points B and C) o – the switch (across points C and D) o – one of the connecting leads (across points A and B).

DISCUSS AND EXPLAIN

9. Were your predictions correct?

10. Why has the voltage across the switch changed so much?

Year 8/9 science homework questions

11. Explain how a voltage drop can occur even though the circuit is not closed. (Hint: Think about what voltage measures.)

Year 8/9 science homework questions Week 5

Revision week: During this week you are permitted to use class time to summarise hand written

notes in your exercise books as it is an open book exam. Here are some helpful hints of what you

should know from each of the topics we’ve covered this year.

Chemistry

ELEMENTS AND ATOMS

describe some common chemical elements recall the chemical symbols of some common elements identify some of the dangers associated with some chemical elements model the structure of the atom and describe the characteristics of the three main particles recall that each chemical element is identified with a unique atomic number, which is equal to

the number of protons in its nucleus distinguish between metals, non-metals and metalloids identify similar properties of groups of elements in the periodic table

PHYSICAL AND CHEMICAL PROPERTIES

distinguish between the physical and chemical properties of substances outline some examples of physical and chemical properties recognise that the chemical properties of a substance affect its use outline the benefits and disadvantages of plastics compare the properties and method of manufacturing soaps and detergents explain the difference between natural and synthetic fibres, and discuss their advantages

and disadvantages

COMPOUNDS AND MIXTURES

distinguish between elements, compounds and mixtures recall that the atoms in compounds are bonded very tightly together recall that elements can be separated from compounds only through a chemical reaction recognise that the properties of compounds are different from the elements that make them

up use the formulas of simple compounds to identify the elements that make them up model the arrangement of atoms in the molecules of some compounds

PHYSICAL AND CHEMICAL CHANGE

define chemical change as a change in which the bonds between atoms or molecules are broken or new bonds between these particles are formed

distinguish between physical changes and chemical changes

CHEMICAL REACTIONS

define a chemical reaction as a chemical change in which a new substance is produced identify evidence that a chemical reaction has taken place distinguish between the reactants and products of a chemical reaction describe simple chemical reactions using word equations describe a variety of methods of speeding up or slowing down chemical reactions

Year 8/9 science homework questions

Geology

CLASSIFYING ROCKS

describe the formation of igneous rocks distinguish between extrusive and intrusive igneous rocks explain how cooling rate affects crystal size describe the formation of sedimentary rocks explain the role of water in the formation of many sedimentary rocks identify a range of sedimentary rocks using a key based on observing physical and chemical

properties describe the roles of heat and pressure in the formation of metamorphic rocks identify the cyclic nature of the formation of igneous, sedimentary and metamorphic rocks outline the uses of igneous, sedimentary and metamorphic rocks, including as building

materials

MINERALS

recall that all rocks are made of substances called minerals describe the physical properties of a variety of minerals recognise that the minerals in some rocks provide valuable resources describe the processes involved in mining mineral ores

READING THE EARTH'S HISTORY IN ROCKS

explain how layers of sedimentary and other rocks, together with fossils, reveal information about past environments and life on Earth

SCIENCE INQUIRY SKILLS

examine evidence in order to evaluate the theories about the extinction of the dinosaurs

SCIENCE AS A HUMAN ENDEAVOUR

explain how the expertise of scientists and engineers is used in mineral exploration, the extraction of mineral ores and metals, and the rehabilitation of mining sites

describe some examples of the use of traditional rock technology in the daily lives of Aboriginal and Torres Strait Islander peoples

discuss the environmental and community issues associated with the mining of mineral resources

Year 8/9 science homework questions

Ecosystems

FEATURES OF ECOSYSTEMS identify examples of biotic and abiotic factors in ecosystems

RELATIONSHIPS WITHIN ECOSYSTEMS describe the following interactions between species: parasitism, mutualism and

commensalism construct food chains and food webs describe the role of decomposers and detritivores in ecosystems

ENERGY AND MATERIALS IN ECOSYSTEMS describe the flow of energy through an ecosystem interpret ecological pyramids extract information from food webs use cycle diagrams to describe the carbon and nitrogen cycle outline the role of chlorophyll in photosynthesis recall word and symbol equations for photosynthesis and cellular respiration describe the role of photosynthesis and respiration in ecosystems

HUMAN IMPACT ON ECOSYSTEMS describe ways in which humans have affected on ecosystem

Biology

CAUSE OF DISEASE compare infectious and non-infectious disease define the following terms: pathogen, parasite, cellular pathogen, non-cellular pathogen,

host, plague, epidemic, pandemic describe ways in which diseases can be transmitted recall examples of disease caused by viruses, bacteria, fungi and animal parasites

HISTORY OF DISEASE describe how ideas about disease transmission and treatment have changed from medieval

times to the present as technology and knowledge have developed.

DEFENCE AGAINST DISEASE distinguish between the first, second and third lines of defence against disease describe the role of the skin, mucous membranes, chemical barriers and other components

of the first line of defence against disease in the human body outline how inflammation, fever and phagocytosis assist in the maintenance of health explain how specific immunity against a particular pathogen is acquired

Year 8/9 science homework questions

Energy

HEAT TRANSFER describe, compare and explain the transfer of heat by conduction, convection and radiation use the particle model to explain heat transfer by conduction and convection contrast the properties of conductors and insulators investigate the radiation and absorption of radiant heat explain sea breezes in terms of radiation, conduction and convection

ELECTRIC CIRCUITS distinguish between static electricity and the flow of electric current in a closed circuit explain energy transfer in an electric circuit relate electric current to the flow of electric charge in a closed circuit relate voltage to the energy gained or lost by electric charge as it moves through an electric

circuit draw and interpret electric circuit diagrams distinguish between series and parallel circuits correctly use an ammeter and voltmeter appreciate the errors associated with reading scales and distinguish between random and

systematic errors

CELLS AND BATTERIES compare the advantages of alkaline and mercury cells over general-purpose dry cells describe the operation of rechargeable batteries define electrical resistance and explain how it affects the electric current flowing through a

circuit distinguish between conductors and insulators distinguish between ohmic and non-ohmic conductors

ELECTRICITY AT HOME distinguish between alternating and direct currents explain why household power points have three sockets describe the role of fuses and circuit breakers describe the role of transformers and rectifiers as they are used in household appliance

leads

Week 6

Exam Week

You will have 2 periods prior to your science exam to complete your final review prior to your final

Exam. And the remaining weeks 7 to 9 are dedicated to your end of year Production.

Year 8/9 science homework questions

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