N5 Rates and Nuclear

Front

What is the meaning of isotopes?

Back

Atoms of the same element with different numbers of neutrons

Front

What is the meaning of the term half-life?

Back

Time taken for half of the nuclei of a particular isotope to decay

Front

What is an alpha particle?

Back

A helium nucleus (2 protons and 2 neutrons)

Front

What is a beta particles

Back

High-energy, high-speed electron given out by a nucleus

Front

What is gamma radiation?

Back

High-energy electromagnetic radiation emitted by a nucleus

Front

State the full meaning of the term catalyst.

Back

Substances that speed up chemical reactions but can be recovered chemically unchanged at the end of the reaction.

Front

What is the end-point of a reaction?

Back

The stage where a reaction has finished.

Front

What are the 4 ways to increase the rate of a reaction?

Back

1. 1. increase temperature

2. 2. increase concentration

3. 3. decrease particle size (increase surface area)

4. 4. add a catalyst

Front

What happens to the half-life of a radioactive isotope if it is heated?

Back

Nothing - no changes affect the half-life

Front

Why does the rate of a reaction decrease over time?

Back

Due to the concentration of reactants decreasing as the reaction proceeds.