3.x Conservation Of Mass (Year 10 Chemistry)

The following test is covering '3.x Conservation Of Mass' for Year 10 Chemistry.

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In an experiment, 11.25g of sodium reacts completely with 17.25g of chlorine. What is the mass of sodium chloride produced?

What principle states that the total mass before a reaction equals the total mass afterward?

When 12g of carbon reacts with 32g of oxygen to produce carbon dioxide, what is the mass of carbon dioxide produced?

Copper (64g) reacts with oxygen (16g). What is the mass of the copper oxide produced?

Potassium (3.9g) reacts with oxygen (3g) to form potassium oxide. What mass of potassium oxide results from this reaction?

If 28g nitrogen gas completely react with 6g hydrogen gas to form ammonia, what is the mass of ammonia produced?

When a substance burns in 23g of oxygen, producing an oxide, how many grams of product result if the substance weighed 50g before burning?