Elements and compounds Flashcards
Which is the best way to get salt from salty water?
Evaporation is the best way to get salt from salty water.
Pure water can be separated from inky water by simple distillation because:
Pure water can be separated from inky water by simple distillation because water evaporates leaving the ink particles behind.
What is the correct order for obtaining salt from a mixture of sand and salt?
The correct order is: dissolving in water - filtration - evaporation.
Which method is usually used to separate coloured substances from each other?
Simple distillation
Evaporation
Chromatography
Chromatography is usually used to separate coloured substances from each other.
How could you separate iron filings from a mixture of iron and sulfur?
Iron and sulfur can be separated using a magnet.
In filtration, what name is used to describe the solid left in the filter paper?
The residue is the solid left in the filter paper.
If you wanted to make pure drinking water from sea water, what process would you use?
Distillation would allow you to separate pure water from salty water.
Crude oil can be separated into several liquids that have different boiling points. What is the name of this process?
Fractional distillation separates liquids that have different boiling points.
In chromatography, where are the spots of coloured substances placed?
The spots are placed on a horizontal pencil line on the piece of paper.
What is the name of the piece of paper at the end of a chromatography experiment?
A chromatogram is produced at the end of a chromatography experiment.
Which statement about elements is correct?
Most elements are metals
Most elements are non-metals
There are about the same number of metals and non-metals
Most elements are metals.
Where are the metals found in the periodic table?
On the left
On the right
Scattered all over
Metals are found on the left of the periodic table
Which of the following is a general property of non-metals?
Shiny
Good conductor of heat
Poor conductor of electricity
Almost all non-metals are poor conductors of electricity.
Which of the following is a general property of metals?
Brittle
Strong
Poor conductor of heat
Most metals are strong.
An element sinks in water and makes a ringing sound when hit. It is most likely to be:
A metal
A non-metal
An alloy
An element that sinks in water and makes a ringing sound when hit is most likely to be a metal.
