Explanation

• As a result of the flow of energy (heat) from a region of high temperature to a region of low temperature: the warmer materials cool down and cooler materials warm up.
• This flow of energy is known as heat transfer.
• It occurs through conduction, convection, and radiation.
  
• As a result, the warmer materials lose energy and cool down, while the cooler materials gain energy and warm up.

Explanation

• Heat is a form of energy that is transferred from one body to another due to a temperature difference.
• It is a type of kinetic energy that is transferred through the motion of particles.

Explanation

• Temperature is the measurement of the hotness or coldness of an object or substance.
• It is a physical property that is usually measured in units of Celsius (°C), Fahrenheit (°F), or Kelvin (K).

Explanation

When you put sand, salt, and sawdust in a glass of water, the following things happen:

• Salt dissolves in water, meaning it breaks down into individual particles that are distributed evenly throughout the water.
• Sand sinks to the bottom of the glass, because it is denser than water and cannot float or dissolve in it.
• Sawdust floats on top of the water, because it is less dense than water and is able to remain suspended on the surface.

Explanation

• The process of separating solute and solvent from a mixture is generally referred to as Filtration.
• Filtration is used to separate an insoluble solid (solute) from a liquid (solvent) by passing the mixture through a filter.

Explanation

• Decantation is the process of carefully pouring a liquid from one container to another, leaving the solid particles that have settled at the bottom of the original container behind.
• This process is used to separate a liquid from a solid, without disturbing the solid.

Explanation

• Water (H2O) is a compound made up of two hydrogen atoms and one oxygen atom.
• It is a chemical combination of two different elements, which is the definition of a compound.

Explanation

• Solids like sand remain suspended in water because they are denser than water.
• But not dense enough to sink to the bottom immediately.
• This creates a heterogeneous mixture, where the sand particles remain suspended in the water.

Explanation

• Solids like sawdust float on water because they are less dense than water.
• When sawdust is added to water, it forms a heterogeneous mixture.
• Where the sawdust particles remain separate from the water and float on the surface.

Explanation

• Solids like salt (sodium chloride) dissolve in water to form a saltwater mixture or solution.
• When salt is added to water, the salt particles break apart and distribute evenly throughout the water, creating a homogeneous mixture.