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Flashcards in Chemistry Deck (9)
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1

Compound

A combination of two or more elements, bonded in some way.

Example: H2O (water)

2

Binary

A compound composed of two elements only.

Example: carbon monoxide (CO)

3

Atom

- The smallest particle of an element that retains the chemical properties of that element.

ALSO

- they are the smallest unit into which matter can be divided without the release of electrically charged particles.

4

How many elements are there?

118

5

Element

- A substance which cannot be split into simpler substances by a chemical reaction.

- they are the fundamental materials by which all matter is composed.

Example: H (hydrogen atom)

6

Nuclear fission

- The division of a nucleus of an atom.

- caused by bombardment with a neutron (a subatomic particle).

7

What is the affect of nuclear fission?

When a neutron splits an atom:

- it forms neutrons and nuclei of other elements.

- it releases huge amounts of energy.

- the release of neutrons also causes the fission of other atoms, which in turn produces more neutrons.

- this leads to a chain reaction.


8

When is nuclear fission used?

- controlled nuclear fission is used in nuclear power stations.

- uncontrolled fission (atom bombs) is very explosive.

9

Nuclear fusion

The combination of:

- two nuclei to form a larger one.

- it will only take place at extremely high temperatures.

- releases huge amounts of energy.

- nuclear fusion takes place in the hydrogen bomb.