What is the chemical symbol for water?

What gas do plants release during photosynthesis?

What do you call a substance made of only one kind of atom?

Which element has the atomic number 1?

What is table salt made of?

Which state of matter has a definite shape and volume?

 What type of reaction happens when something burns?

Which element is liquid at room temperature?

What kind of charge does an electron carry?

What do you call a solution with a pH less than 7?