1. Look at the particle models for different substance
A
B
C
E
F
G
a. Which particle model represents solid element?
…………B…………………………………………………….
b. Which particle models represent pure compounds?
…………A…… and……………D………………………………..
Explain your answer.
Contain two element/two types of atom
That are chemically combined/that are bonded together
c. Which particle model represents a mixture of compounds?
……………F…………………………………………………………………
d. Which particle model represent a mixture of elements?
……………………G……………………………………………………………..
e. One of the particle models represent the gas carbon dioxide.
Describe how to test for carbon dioxide.
a. Test Bubble into limewater / calcium hydroxide solution
b. Hold a burning splint in gas
Observation for a positive result
a. Goes milky/white precipitate/white solid formed
f. One of the particle models represents the gas hydrogen
Describe how to test for hydrogen
Test
Use a lighted splint
Observation for a positive result
squeaky pop noise
g. One of the particle models represent the gas oxygen
Describe how to test for oxygen.
Putting a glowing wooden splint in a test tube of oxygen
Observation for a positive result
The splint re-lights
2. The solid compound formed in the reaction contains a magnesium particle and an oxygen
particle
In the box draw a particle model to describe the solid compound.
Use O as a particle of oxygen and
as a particle of magnesium
D
3. Ahmed finds this information about six substance
a. Use these properties to sort the six substances into metals and non-metals.
One has been done for you.
4. The bottle has hazard symbols
A
B
C
Write down the meaning of each of these hazard symbols.
Hazard symbol A hazardous to the environment
Hazard symbol B flammable
Hazard symbol C corrosive
Hazars symbol D Acutely toxic
5. Air contains a mixture of gases.
The pie chart shows the percentages of the different gases in clean dry air.
a. Look at the pie chart
D
b. Name gas A ad B
A: Nitrogen
B: Oksigen
c. Gas C is a mixture of gases. Name one of these gases
Carbon dioxide/argon/neon/krypton/xenon
d. Large areas of raiforest are being cleared by deforestation.
The trees are bumt after they have been cut down
This increases the presentage of one gas in the surrounding air.
Which Gas?
Carbon dioxide
6. Yuri finds some information on the internet about organisms which live in the amazon rainforest
Trees produce fruit and nuts
Jaguars eat tapirs
Boa costrictors eat sloths
Macaws, monkeys, agoutis, tapirs and sloths eat the fruit and nuts on the trees
Mokeys are eaten by eagles
a. Yuri uses the information to write a food web
Complete his food web
b. What do the arrows in the food web show?
Energy flow (through the food web)
c. How many primary consumers are there in this food web? 5
d. There are decomposers in the rainforest
• Name an example of a decomposer
Microorganisms/bacteria/fungi
• What do decomposers feed on?
Dead material/ decaying material/waste material/ dead leaves/ dead animal/faeces
7. Look at the diagram of an animal cell
a. Write down the name and function of structure A
Cell membrane = it controls what moves in and out of the cell
b. Write down the name and function of structure B
Mitochondrion = where aerobic respiration take place/the release of energy
The diagrams show four cells labelled A to D
Complete the table with the letter of the cell matched to its function
Function
Letter
To carry signals around the body
A
To absorb water
D
To carry oxygen
C
8. Safia reacts some white solid calcium carbonate with dilute hydrochloric acid.
Carbon dioxide, water and a colourless solution of calcium chloride are made in the reaction.
a. Suggest two observation safia makes to confirm a chemical reaction takes place.
1. Bubles or fizzing
2. Colour change
3. Calcium carbonate disappears
b. During the reaction the dilute hydrochloric acid is neutralised.
Describe what happens to the pH of the dilute hydrochloric acid.
Increase or get higher
9. Read the information about different species of penguin.
a. Look at the dichotomous key .
Use the information and the dichotomous key to identify the four different species of penguin.
Penguin A Adelie
Penguin B Emperor
Penguin C Chinstrap
Penguin D African
b. The four different species of penguin have been sorted into two groups using their height
What other information can be used to sort the penguins into these two groups?
How many eggs do the lay each breeding season?/they lay one egg each breeding season/the
lay two eggs each breading season
c. What piece of equipment is to measure the height of the penguins?
Metre ruler/tape measure
10. The mountain zebra belongs to the species, Equus zebra.
a. Define the term species
Group of organisms that can reproduce to make fertile offspring
b. A virus makes the mountain zebra become ill.
Mia thinks a virus is a living organism.
Tick (√) to show if mia is correct
Explain your answer
No ; because viruses are not made out of cell/ do not grow/ they do not show all seven
characteristics
11. Mia investigates three substances, bleach, vinegar and soap.
She wants to know the pH of each of three liquids.
Write down how Mia does the investigation.
Include:
• The names of any chemicals she uses
• The method
• How Mia is able to make a conclusion from his results
-
Add Universal indicator
Observe or record the colour (of the indicator)
Match the colour with a pH colour chart
12. Colin investigate growth in plants
a. Colin use secondary information sources.
What is secondary information source?
Information from people who did not do the experiment
b. Colin puts two identical trays containing soil and seeds in the classroom.
He gave each tray the same amount of water every day
One tray A was left beside a window in the light and the other, B in a dark cupboard.
Both trays were at the same temperature.
The diagram shows the young plants two weeks after planting.
Describe and explain one safety precaution Colin takes in this investigation.
Safety precaution washes hands afterwards or wears gloves explanation to protect against any
soil bacteria
c. Write down two differences that you can see between the plants in trays A and B
B are taller and have paler leaves