Chemical Changes and Reactions Quiz

Which of these is a physical change?

• Melting of ice

• Rusting of iron

• Cooking an egg

• Burning of wood

What proves that a chemical change has occurred during rusting?

• Iron becomes colder

• Iron changes shape

• A new brown substance forms

• The iron gets wet

Which of the following is not a sign of chemical change?

• Change in color

• Gas formation

• Melting

• Formation of a new substance

Respiration in our body is a chemical reaction because:

• It makes us tired

• It mixes air and food

• It produces new substances and releases energy

• It keeps our lungs working

What type of reaction is photosynthesis?

• Breakdown reaction

• Endothermic reaction

• Neutralization

• Rusting

Which of these best describes fermentation?

• Formation of a solid from a liquid

• Breaking food using oxygen

• A slow chemical change caused by microbes

• Turning gas into liquid

What is common between respiration and combustion (burning)?

• Both are physical changes

• Both produce light

• Both need oxygen and release energy

• Both happen only in machines

Which of these reactions shows displacement?

• Vinegar + baking soda → fizz

• Copper + Iron → nothing

• Iron + Copper sulfate → Iron sulfate + Copper

• Salt + Water → Saltwater

What makes neutralization reactions special?

• They change color

• They make something cold

• They mix an acid and a base to form salt and water

• They always explode

You add lemon juice to baking soda, and bubbles appear. What type of change is this?

• Physical change

• Freezing

• Dissolving

• Chemical change