Explanation

Binoculars use a combination of lenses and prisms to magnify and redirect light, relying on total internal reflection to ensure minimal light loss and a bright, clear image.

Explanation

Reflecting prisms work on the principle of total internal reflection, where light is completely reflected back into the prism material rather than passing through the interface.

Explanation

• Refrigerators work on the principle of heat transfer through conduction, convection, and radiation.
• They use a combination of these methods to transfer heat from the inside to the outside, keeping your food and drinks cool and fresh.

Explanation

• During nighttime, the air above the land loses heat and cools down, causing its density to increase.
• This is because cool air contracts and becomes denser than warm air.

Explanation

• Conduction is the transfer of internal energy (heat) through direct contact between particles or molecules.
• Including collisions and movements of electrons within a substance.
• This process occurs in solids.

Explanation

• Burning of wood is a chemical change, as it involves a chemical reaction between the wood and oxygen.
• Resulting in a change in chemical composition and the formation of new substances (ashes, carbon dioxide, water vapor, etc).

Explanation

• A chemical change, also known as a chemical reaction.
• It is a process that alters the composition of one or more substances, resulting in the formation of new substances with different properties.

Explanation

A change in physical appearance or state of a substance, such as a change in shape, size, color, or phase (solid, liquid, gas), is called a Physical Change.

Explanation

• A release of gas is typically a sign of a chemical change, not a physical change.

The signs of physical change:

• Change that can be reversed
• The substance does not turn into a new substance

Explanation

• A chemical formula tells us the number of atoms of each element in a compound.
• It contains the symbols of atoms of the elements present in the compound.
• As well as how many there are for each element, in the form of subscripts.