Which of these elements is a halogen?

Which law states that gases combine in simple whole number ratios by volume at the same temperature and pressure?

Which particle has a negative charge?

Which element is the lightest gas known?

What is the chemical formula for calcium hydroxide also known as slaked lime?

What is the chemical name for baking soda commonly used in cooking?

Which acid is commonly found in the human stomach?

What is the chemical formula for ozone, the molecule that forms the protective layer in the stratosphere?

Which element is essential for photosynthesis and found in chlorophyll?

What is the SI unit of the amount of substance in chemistry?

What is the chemical formula for ethanoic acid commonly found in vinegar?