Topic 2- Questions Flashcards
Why is it important to use the same volume of water when testing each substance?
To keep it a fair test.
A suspension is a solid that does not dissolve but just mixes with a liquid. Which substances forms a suspension?
Flour and sand,
Describe what happens to a suspension that has been allowed to sit for some time.
It sinks to the bottom of the test tube.
How could you separate the insoluble solid from the water?
Evaporation.
How could you retrieve the sugar from the sugar solution?
Evaporation
What are the 5 parts of the Bunsen burner called?
- Barrel.
- Regulating collar.
- Air hole.
- Gas tubing.
- Base.
What colour of flame would sodium chloride burn with?
Yellow or orange.
What colour of flame would calcium chloride burn with?
Brick red
What colour of flame would strontium chloride burn with?
Red
What colour of flame would potassium chloride burn with?
Lilac
Give two examples of a reversible change.
Ice melting.
Candle wax melting.
Give two examples of an irreversible change.
Break cooking.
Wood splint burning.
Name the process that causes the clothes on a line to dry.
Evaporation
Name two substances that dissolve readily in water.
Sugar and copper sulfate.
Name two substances that do not dissolve in water.
Flour and sand.
How would you separate an insoluble solid from water?
Filtering.
A mixture of chalk and water is filtered using a filter paper and funnel.
The chalk stays in the filter because it is …
Insoluble
What are the units for solubility?
g/100g of water.
Three essential things are needed for burning. What are they?
Heat, oxygen and fuel.
When magnesium burns it forms a new substance called..
Magnesium oxide.
Magnesium burns with a brilliant white light. What is it used for?
Stress flares or fireworks, alloys or other is used to prevent the corrosion of iron.
What is metal magnesium used for?
Car seats,
Luggage,
Laptops,
Cameras,
Power tools.
