Xx Dec 2024 u1 Sem Ex Review

Front

What is an exothermic change?

Back

An exothermic change is a process that releases kinetic energy in the form of heat.

Front

What is a chemical change? Provide an example.

Back

A chemical change is a transformation that alters the chemical composition of a substance. Example: The cooking of a cake.

Front

Identify the equipment used to hold test tubes.

Back

Test tube holder.

Front

How many significant digits are in the number 53,000?

Back

There are 2 significant digits in the number 53,000.

Front

What is the formula for density?

Back

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or arrangement.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object due to its motion.

Front

Define endothermic change.

Back

An endothermic change is a process that absorbs energy from its surroundings, usually in the form of heat.

Front

What is the difference between physical and chemical changes?

Back

Physical changes do not alter the chemical composition of a substance, while chemical changes do.

Front

What is the significance of significant digits in measurements?

Back

Significant digits indicate the precision of a measurement and help convey the accuracy of the data.