Explanation

Matter changes state from:

• Solid to liquid (melting) when it gains energy
• Liquid to gas (vaporization) when it gains energy

This is because the particles need more energy to break free from their rigid structure in solids and move more freely in liquids, and even more energy to escape into the air as gases.

Explanation

• Easily digested and absorbed
• Quickly converted into glucose
• Readily available for use by the body's cells

Explanation

A compound machine is a machine that is made up of two or more simple machines.

A bicycle, a crane, wheel borrow and scissors are examples of compound machines because they are made up of multiple simple machines, such as:

• Wheels and axles (simple machine: wheel)
• Pedals and levers (simple machine: lever)
• Gears and pulleys (simple machine: pulley)
• Inclined planes (simple machine: inclined plane)

Explanation

Force cannot change the content of an object, as it only affects the object's motion, shape, and position, but not its composition or internal structure.

Explanation

• Heat is a form of energy that flows from a region of high temperature to a region of low temperature.
• This flow of energy occurs through the transfer of kinetic energy from particles in motion.

Explanation

• Sand does not dissolve in water.
• Unlike sugar, glucose, and salt, which are all soluble in water.

Explanation

• Condensation is the process by which water vapor (gas) changes to liquid water, releasing energy in the form of heat.
• This occurs when warm air, containing water vapor, comes into contact with a cool surface.
• It causing the water vapor to condense into droplets of water.

Explanation

The the life cycle of a butterfly:

• Eggs: The female butterfly lays eggs on a leaf.
• Caterpillar (Larva): The egg hatches into a caterpillar, which eats and grows.
• Pupa (Chrysalis): The caterpillar transforms into a pupa, a resting stage where it undergoes metamorphosis.
• Adult (Butterfly): The pupa emerges as a fully formed adult butterfly, ready to fly and reproduce.

Explanation

Alpha (α) radiation consists of heavy, positively charged particles (alpha particles) that are emitted from the nucleus of an atom during certain types of radioactive decay.

Alpha particles are highly ionizing, meaning they can efficiently remove tightly bound electrons from atoms, resulting in the formation of ions.

Explanation

• A pulley is a simple machine that uses grooved wheels and a rope to raise, lower, or move a load.
• It changes the direction of the force, making it easier to lift or move heavy loads.
• Examples: Raising a load and A flag pulley.