DB Mid-term Exam part 1

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Example: Aluminum metal is pounded into sheets.

Front

What energy conversion occurs in a toaster?

Back

A toaster converts electrical energy to thermal energy.

Front

What is net force?

Back

Net force is the sum of all forces acting on an object, determining its motion.

Front

What is the chemical formula for Baking Soda?

Back

The chemical formula for Baking Soda is NaHCO₃, which consists of 4 elements: Sodium (Na), Hydrogen (H), Carbon (C), and Oxygen (O).

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or height. Example: A book on a shelf has potential energy.

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. Example: Rusting of iron is a chemical change.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object in motion. Example: A moving car has kinetic energy.

Front

What is the law of conservation of energy?

Back

The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

Front

What is the formula for calculating net force?

Back

Net force (F_net) = F_applied - F_friction, where F_applied is the force applied to an object and F_friction is the opposing force.

Front

What is an example of a chemical change?

Back

An example of a chemical change is when copper reacts with a strong acid and releases heat.