Formulae,equations,hazards Flashcards Preview

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Flashcards in Formulae,equations,hazards Deck (15):
1

What’s an element

Substance made from atoms with the same number of protons in the nucleus

2

What’s an atom

Smallest particle of an element that still has its chemical properties

3

What’s a molecule

Two or more atoms chemically joined together

4

Most elements that are gases at room temperature exist as

Molecules with two atoms

H2 N2 O2 F2 Cl2

5

Chemical formula for methane

CH4

6

What’s an ion

Atom or group of atoms gain or lose an electron and from a positive or negative charge

7

When writing ionic equations

All substances are shown by their formula

Number of atoms of each element in the reactants and products are the same

Total electrical charge is the same on both sides of the equation

8

Oppositely charged ions in a solution may join to form a...

Insoluble solid called a precipitate

9

What’s a hazard

Something that could cause damage or harm to someone or something

Adverse health effects which may occur immediately or later on

10

What’s a risk

The chance that someone or something will be harmed if exposed to a hazard

11

The amount of risk depends on factors such as

How much someone is exposed to a hazard

The way in which exposure happens

How serious the effects of exposure are

12

What’s a precaution

Something that you can do to reduce the risk of a hazard

13

What are hazard symbols intended to do

Warn about the dangers assosiacted with the substance in the container

Let people know about the precautions to take when they use the substance

14

Common hazard symbols

Harmful/irritant
Toxic
Flammable
Corrosive
Respiratory sensitiser
Oxidising

15

Hydrogen + hydroxide =

Water