If a magnesium ribbon is burned in an open crucible, the mass of the resulting white powder (magnesium oxide) is found to be greater than the mass of the original magnesium. This is because:

True or False: In a balanced chemical equation, the sum of the coefficients of the reactants must always be equal to the sum of the coefficients of the products.

True or False: In a chemical reaction, the atoms of the reactants change their identity into new elements to form the products.

If ${24.3\text{ g}}$ of magnesium is burned in a rigid, completely sealed glass vessel containing ${16.0\text{ g}}$ of oxygen, what will be the total mass of the vessel and its contents after the reaction compared to before?

MYP MYP Chemistry Topic Chemical Reactions and the Conservation of Mass Questionbank

Practice MYP MYP Chemistry Topic Chemical Reactions and the Conservation of Mass with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for Chemical Reactions and the Conservation of Mass and mirrors Paper 1, 2 style where relevant.

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Oxygen atoms from the air combine with the magnesium to form the product.

The magnesium reacts with nitrogen from the air to form a heavy solid.

Magnesium atoms gain mass when they are heated.

The crucible absorbs moisture from the magnesium during heating.

True

False

True

False

The mass will decrease as the oxygen is consumed

The mass will increase because magnesium oxide is heavier than magnesium

The mass will double because two substances combined

The mass will remain exactly the same