Which of these is not a sign of chemical change?

Phizz heats some iron in air. It reacts with oxygen to make iron oxide. Name the reactant and products in this reaction.

when you heat carbon in air, its mass decreases because...

Filip heats 0.12 g oof magnesium in air. It burns to make 0.20 g of magnesium oxide. What mass of oxygen has joined with magnesium in this reaction?

magnesium + oxygen --> ?

iron + oxygen + water --> hydrated iron oxide.

This reaction is also called, tick all that apply

Which is not a way to prevent rusting?

What is the term for the yellow thing formed that is a sign of a chemical change?

In a chemical reaction, what does the arrow mean? choose the best answer.

which is the best way to write;

Heating sodium in bromine makes sodium bromide.

What is the missing product;

Hydrochloric acid + sodium hydroxide → ________ + water

Sulfuric acid + ______ → magnesium sulfate + water + carbon dioxide

Potassium + oxygen → _______

calcium + water --> _______