Explain how the use of fossil fuels can contribute to the increase in atmospheric CO2
Burning releases CO2
Suggest a way in which we can reduce how much electrical energy we use
Answers can vary
Name a base
Name a neutral substance
State a consequence of rising sea levels on coastal areas
Answers can vary
name an instrument used to measure time
stopwatch
How could students measure the pH of a substance
By using an indicator
State 2 reasons why the recycling of plastics is considered to be of benefit to the environment
Answers can vary
How does recycling work
materials reused
Give a reason for why a rock sinks in water
Rock is more dense than water
Give a reason why oil floats on water
Oil is less dense that water
Name 3 safety precautions that should be used when carrying out an experiment
Answers can vary
Explain how deforestation can contribute to the increase in atmospheric CO2
Trees needed to absorb CO2. No trees = more CO2
What is the distance travelled by a car moving at a speed of 70km/h for 30mins
How does composting work
decay of waste
Suggest one possible effect of continued increase in CO2 concentration in the Earth's Atmospjere
Answers can vary
What force allows us to stand on the earth
gravity
The element indium (In) is used in phones. At current usage rates indium will be used up in 50 years. Suggest how humans could sustain levels of this element for future generations
Recycle/upgrade phone less often
Which of the following uses the most electrical energy, coffee maker, television, kitchen blener,dishwasher?
Dishwasher uses 2300W
Name a human activity that has led to global warming
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Describe 3 differences between a physical change and a chemical change
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What is the density of a solid that has a mass of 12g and a volume of 1.5ml
8g/ml
State the unit of energy
Joules or kJ
Name an unwanted form of energy produced by lightbulbs
heat
A box has mass 128g and volume 64ml what is the density of the box?
2
Explain what non-biodegradable means
cannot be broken down by living organisms
A box has length 8cm, width 2cm and height 4cm. What is the volume of the box
64
Why is it important to improve the energy efficiency of household devices such as lamps?
reduce waste energy
Name an acid
How does landfill work
dumping site
Explain the 4 energy conversion used for phones
Electrical to chemical to light to heat
Calculate the speed of a car that travels 50km in 2 hours
25km/h
How does incineration work?
burning waste
From which raw materials are most plastics made?
crude oil
Define sustainability
The use of a resource so that it does not run out
Describe the difference between mass and weight?
mass - amount of matter in an object. weight is force of gravity on the mass
A student carried out an experiment to investigate the reaction between an acid and a base. A pH indicator and a thermometer were used to monitor changes in pH and temperature during the reaction. Name a pH indicator the student used.
Methyl orange/ litmus/ universal indicator
What number on the pH scale represents a neutral solution
7
What colour does litmus paper turn when placed in an acid
red
Give 2 ways in which we can care for our planet
Answers can vary
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