Chemical reactions revision

The process of a liquid turning into vapor or gas.

• condensation

• freezing

• evaporation

• melting

When warm air meets a cold surface, like a window, __________ forms water droplets on the glass.

• condensation

• freezing

• evaporation

• melting

A solid formed from a chemical reaction in a liquid solution.

• solvent

• precipitate

• acid

• ice

Substances that undergo a chemical reaction to form new products.

• reactants

• residue

• new substance

The following are true about products except for:

• Substances formed as a result of a chemical reaction.

• They are the end results of a chemical reaction.

• • Example: In the reaction 2H₂ + O₂ → 2H₂O, Hydrogen is the product.

When you light a candle wick and reacts with oxygen, the following also happens:

• water vapor and carbon dioxide being produced.

• you will see a flame

• you will feel heat

• all of these

Which of the following is an example of a chemical reaction?

• burning wood branches

• breaking wood branches

• chopping wood branches

Which of the following is an example of a physical change?

• dissolving sugar

• rusting of iron

• rotting of fruits

Changes in the states of matter like evaporation, condensation, freezing and melting also change the chemical nature of the atoms

• True

• False

The atoms are destroyed and disappear in a chemical reaction.

• True

• False