Topic 6 MCQs IGCSE Review

Front

What is the principle of conservation of mass?

Back

The principle of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

Front

Define an ionic bond.

Back

An ionic bond is a type of chemical bond formed through the electrostatic attraction between oppositely charged ions, typically between a metal and a non-metal.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is a substance formed when two or more elements chemically bond together.

Front

Explain the concept of molarity.

Back

Molarity is a measure of concentration, defined as the number of moles of solute per liter of solution (mol/L).

Front

What is the pH scale?

Back

The pH scale measures the acidity or basicity of a solution, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

Define kinetic energy.

Back

Kinetic energy is the energy possessed by an object due to its motion, calculated using the formula KE = 1/2 mv², where m is mass and v is velocity.

Front

What is the law of reflection?

Back

The law of reflection states that when a light ray reflects off a surface, the angle of incidence is equal to the angle of reflection.

Front

Explain the difference between speed and velocity.

Back

Speed is a scalar quantity that measures how fast an object is moving, while velocity is a vector quantity that includes both speed and direction.

Front

What is a chemical reaction?

Back

A chemical reaction is a process in which substances (reactants) are transformed into new substances (products) through the breaking and forming of chemical bonds.

Front

Define the term 'catalyst'.

Back

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.