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7th Grade Science Unit 5
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How can you test if a substance is an acid or an alkali?
Use an indicator like red cabbage juice.
What safety equipment should be worn when handling acids?
Safety glasses and gloves.
What does a toxic symbol (☠) mean?
The substance can poison you.
What hazard symbol represents something flammable?
🔥 (Flame).
Why should you stand up while working with chemicals?
To avoid spills onto your body.
What happens when an acid and an alkali mix?
They neutralize each other.
Why are alkalis dangerous to the eyes?
They can cause serious burns or blindness.
Name a strong alkali.
Sodium hydroxide.
What should you do if you spill acid on your skin?
Wash the area with plenty of water.
What does 'corrosive' mean?
A substance that can burn or damage living tissue.
Name a food that contains acid.
Lemons, limes, or oranges.
Why should you not stir the mixture while filtering?
It may push solid particles through the filter.
How can you separate food dye from water?
Using a condenser to collect pure water.
What happens when saltwater is heated in an evaporating dish?
The water evaporates, leaving salt behind.
Why is filtration used to separate sand from saltwater?
Sand does not dissolve, so it remains in the filter.
Name one similarity between brass and bronze.
Both contain copper.
Why does brass have a range of melting points?
The ratio of copper to zinc varies.
Why are titanium alloys used in artificial joints?
They are strong, durable, and resistant to corrosion.
What is duralumin?
An aluminium alloy used in airplanes.
What is shape memory alloy used for?
Glasses frames.
Why is pure gold not used for jewellery?
It is too soft.
Why are coins made from alloys?
Pure metals are too soft for everyday use.
Why is stainless steel useful for cutlery?
It does not rust.
Why is steel harder than iron?
It contains carbon, which strengthens the metal.
What are Olympic medals made from?
Alloys of gold, silver, and bronze.
Why are alloys stronger than pure metals?
Different-sized atoms prevent the layers from sliding.
What is bronze made from?
Copper and tin.
What is an alloy?
A mixture of metals.
Why is chlorine added to swimming pools?
To kill bacteria.
What gas is used in hospitals to help with breathing?
Oxygen.
What is sulfur used for?
It is added to rubber to make it harder.
Why is helium used in balloons?
It is lighter than air.
What is an insulator?
A material that does not conduct electricity.
Why are non-metals used for pan handles?
They do not conduct heat well.
What does 'brittle' mean?
A material that shatters easily when dropped.
Why do non-metals look dull?
They do not reflect light well.
Name five non-metals.
Oxygen, carbon, chlorine, sulfur, and silicon.
What happens to the surface of most metals over time?
It becomes dull.
Name two metals that are magnetic.
Iron and nickel.
Why are metals good electrical conductors?
They allow electric current to flow through them.
Why do metals feel cold when touched?
They are good conductors of heat and take heat away from your hand.
Which metal is liquid at room temperature?
Mercury.
What does 'sonorous' mean?
A material that makes a ringing sound when hit.
Why is gold used for jewellery?
It is shiny, beautiful, and expensive.
Give an example of a ductile metal.
Copper.
What does 'ductile' mean?
A material that can be stretched into wires.
Why is iron used for bridges?
It is strong and can hold large weights without breaking.
What does 'malleable' mean?
A material that can be hammered or bent into shape.
Name three properties of metals.
Strength, malleability, and ductility.
What are metals?
Metals are useful materials that objects are made from.
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