6th Science - Semester 1

Front

What is convection?

Back

Convection is the transfer of heat through the movement of fluids (liquids or gases). It occurs when warmer areas of a liquid or gas rise and cooler areas sink, creating a cycle.

Front

What is conduction?

Back

Conduction is the transfer of heat through direct contact between materials. It occurs when heat moves from a hotter object to a cooler one.

Front

What is radiation?

Back

Radiation is the transfer of heat in the form of electromagnetic waves. It does not require a medium to travel through, allowing heat to be transferred through empty space.

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. Examples include changes in state (like melting or freezing) and shape.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the composition of the original substance.

Front

How does temperature affect molecular movement?

Back

As temperature increases, molecules move faster because they have more energy. Conversely, at lower temperatures, molecular movement slows down.

Front

What is the atomic number of an element?

Back

The atomic number of an element is the number of protons found in the nucleus of an atom of that element. It determines the element's identity.

Front

What is the relationship between heat and temperature?

Back

Heat is the energy transferred between substances due to a temperature difference, while temperature is a measure of the average kinetic energy of the particles in a substance.

Front

What is an example of heat transfer in boiling water?

Back

In boiling water, heat is transferred through convection as the hot water rises and cooler water sinks, creating a circulation pattern.

Front

What happens to the density of water when it is heated?

Back

When water is heated, it expands and becomes less dense, causing it to rise in a convection current.