Dissolving and Solutions Concepts

The video tutorial focuses on the rate of dissolving, a key concept in Cambridge primary science. It introduces the terms solute, solvent, and solution, and explains the particle theory of dissolving. The video also discusses practical aspects, such as the effect of temperature and stirring on dissolving rates, using examples like sea water and tea preparation.

What is the primary focus of the Cambridge primary science model discussed in the video?

• Reading scientific literature

• Conducting experiments

• Thinking and working scientifically

• Memorizing scientific facts

Which of the following is a correct definition of a solute?

• A solid that dissolves in a liquid

• A mixture of two liquids

• A gas that dissolves in a liquid

• A liquid in which a solid dissolves

What is the term used for a liquid that dissolves a solute?

• Solvent

• Solution

• Soluble

• Insoluble

According to the particle model, what happens to solute particles during dissolving?

• They change color

• They settle at the bottom

• They evaporate into the air

• They mix with solvent particles until invisible

Why is water often referred to as a 'universal solvent'?

• It is used in all scientific experiments

• It can dissolve many different solutes

• It can dissolve all substances

• It is the most common liquid

Why is seawater considered a solution rather than just water?

• It contains dissolved salts and ions

• It is a mixture of water and sand

• It contains dissolved gases

• It is used in cooking

What effect does temperature have on the rate of dissolving?

• Stops dissolving

• Increases the rate

• Decreases the rate

• No effect

How does stirring affect the rate of dissolving?

• It has no effect

• It changes the color of the solution

• It slows down the process

• It speeds up the process

What is a dependent variable in the context of a dissolving experiment?

• The temperature of the environment

• The amount of solvent

• The rate of dissolving

• The type of solute used

Which of the following is an example of a control variable in a dissolving experiment?

• The amount of solute

• The type of solute

• The temperature of the solvent

• The stirring speed