Front

What is the atomic number of chromium (Cr)?

Back

24

Front

What is composting?

Back

A method for recycling food and yard waste into a rich, dark soil amendment called compost.

Front

What does the Law of Conservation of Energy state?

Back

Energy cannot be created or destroyed, it can only be transformed.

Front

What instrument is used to detect temperature changes in chemical reactions?

Back

Thermometer

Front

What type of process is the melting of ice cream?

Back

Endothermic process, as it requires more energy from the surroundings than it releases.

Front

Define 'endothermic reaction'.

Back

A reaction that absorbs energy from its surroundings.

Front

Define 'exothermic reaction'.

Back

A reaction that releases energy to its surroundings.

Front

What is the significance of the atomic number in the periodic table?

Back

It represents the number of protons in an atom's nucleus.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the role of a catalyst in a chemical reaction?

Back

A catalyst speeds up a chemical reaction without being consumed in the process.