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Year 9 Chemistry Flashcards | StudBud
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Year 9 Chemistry
Year 9 Chemistry
16 terms
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A #chemistry quiz about atoms, elements, equations, isotopes and radioactivity
Flashcards
16 cards
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Practice quiz
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Questions
16
Answers
1
The atomic number of an element tells us...
the number of protons
the protons + neutrons
the number of neutrons
the number of electrons
2
The mass number of an element tells us...
the protons + electrons
the number of protons
the number of neutrons
the protons + neutrons
3
Which is NOT a sub-atomic particle?
electron
membrane
neutron
proton
4
A molecule...
contains one type of atom
is a pure substance
must contain at least two different types of atom
is two or more atoms joined chemically
5
The '3' in 3NaOH is called the...
multiplier
term
coefficient
constant
6
An element...
is a mixture of two different atoms
is the wind, water, fire, earth
contains only one type of atom
contains two or more types of atom
7
Which is NOT a type of ionising radiation?
Beta
Mutation
Alpha
Gamma
8
We think electrons exist in 'clouds' because...
they are negatively charged
it's rainy inside an atom
they move so fast and their location can't be pin pointed
they are attracted to the positive nucleus
9
How many atoms of hydrogen in 2(OH
2
)
3
?
12
8
6
6
10
A compound...
is a pure substance
must contain at least two different types of atom
is formed by a physical change
contains one type of atom
11
Which is INCORRECT?
Protons are positively charged
Electrons are negatively charged
Neutrons are negatively charged
Neutrons are neutral
12
Compared to protons and neutrons, electrons are...
extremely small
dangerous
positively charged
impossible to move
13
An element has an atomic number of 6 and a mass number of 14. How many neutrons does it have?
20
6
14
8
14
Which is not evidence of a chemical reaction?
Change in state
Light emitted
Precipitate forms
Gas production
15
How many atoms of oxygen in 2(OH)
3
?
6
9
2
3
16
How many of 100 atoms will be left after 10 years, if the element has a half life of 5 years?
25
100
50
20
