KS3 Chemistry

Why does air not have a definite formula?

What is the main problem caused by emissions of carbon dioxide?

Which of these contains two carbon atoms and six hydrogen atoms?

Which statement about atoms and molecules is correct?

Universal indicator solution is usually green to begin with. What does this mean?

Which of these is the correct symbol for magnesium?

Which acid could be used to make ammonium nitrate (a type of fertiliser)?

What name is given to a reaction in which an acid and base react with each other?

What sort of substance is found in many medicines to cure indigestion?

Compared to natural gas, coal:

Universal indicator solution is usually green to begin with. What does this mean?

Why is the blue flame of a Bunsen burner hotter than the orange flame?

Which one is a compound?

Which statement about alkalis is true?

What happens to litmus paper in acidic solutions?

Approximately how many elements are there?

Which of these is the smallest particle?

How many different atoms are there in a compound?

Which is a source of naturally occurring acids?

Which statement about bases is true?