MYP Chemistry 5.1 Chemical Reactions and the Conservation of Mass Questionbank

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?

The atoms are rearranged into different combinations to form products

The atoms are converted into energy to facilitate the reaction

The atoms of the reactants are destroyed and new atoms are created

The atoms lose a negligible amount of mass as they form new bonds

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