Mock revision

What is a solution?

A solution is a mixture of solvents and solutes that are chemically combined.

What is a solute?

A solute dissolves in a solvent to form a solution.

What is a solvent?

A solvent is a substance into which a solute dissolves.

What is an exothermic reaction?

An exothermic reaction gives out heat, gives out energy, and the temperature increases.

What is an endothermic reaction?

An endothermic reaction takes in heat, takes in energy, and the temperature decreases.

What does the rate of reaction mean?

The steeper the rate of reaction, the faster the reaction.

What is a mutagen?

A mutagen is a change in a gene or chromosome.

What is a galaxy?

A galaxy is a group of stars, dust, and gas held together by gravity.

What is a moon?

A moon is a natural satellite that orbits a planet.

What are asteroids?

Asteroids are lumps of rock that orbit the sun.

What is a comet?

A comet is a small lump of ice and dirt that orbits the sun.

What is the formula for weight?

Weight equals mass times gravity.

What units is weight measured in?

Weight is in newtons.

What are the steps of the water cycle?

The water cycle consists of four steps: evaporation, condensation, precipitation, and collection.

What is the law of conservation of mass?

The law of conservation of mass states that matter cannot be created or destroyed but can change form.

What is a carbon sink?

Anything that takes out carbon from the atmosphere is a carbon sink.

What is a carbon source?

Anything that releases carbon into the atmosphere is a carbon source.

How can plants and animals contribute to carbon dioxide in the atmosphere?

Plants can respire CO2 into the atmosphere and animals can eat plants that contain carbon dioxide.

What do decomposers do?

Decomposers break down plants and animal litter to release CO2 into the atmosphere.

What is energy?

Energy is ability to do work.

What is the SI unit for energy?

The SI unit for energy is Joules (J).

Who created the theory of evolution by natural selection?

Charles Darwin created the theory of evolution by natural selection and the book called On the Origin of Species by Means of Natural Selection.

Who was Galileo Galilei?

Galileo Galilei was an Italian astronomer and he created a telescope and saw objects orbiting Jupiter, so he created the heliocentric model.

Who created the Big Bang theory?

The Big Bang theory was created by Georges Lemaitre.

What is everything made of?

Everything is made of particles

What happens to particles in a solid state?

In a solid state, the particles don't move, they have a fixed shape, and they are packed tightly.

What happens to particles in a liquid state?

In a liquid state, the particles touch, move, and slide past each other.

What is viscosity?

Viscosity is the flow rate of a liquid, e.g., syrup is more runny or viscous than water.

What happens to particles in a gas state?

In a gas state, particles fill the container they're in and there is a lot of space between the particles.

What is the freezing point?

The freezing point is the point at which a liquid turns to solid,

What is the boiling point?

The boiling point is the point at which liquid changes to gas

What is the melting point of a substance?

The melting point is the temperature a substance melts, e.g., the melting point of ice is zero degrees.

What is the boiling point of water?

The boiling point of water is 100 degrees Celsius.

What is sublimation?

Sublimation is when substances are heated and they turn straight into a gas from a solid.