This Year 9 Chemistry Mid Unit Revision assesses understanding of atomic structure, including the identification of particles like protons and ions, and electron distribution in energy levels. It enhances knowledge relevant to foundational chemistry concepts.
Cobolt and helium
Copper and holmium
Carbon and hydrogen
Carbon and helium
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Copper + oxygen -> carbon dioxide
Copper + oxygen -> copper sulfide
Copper + oxygen -> copper oxide
Copper + oxygen -> copper iodide
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1,7
10, 7
2, 8, 7
2, 8, 8, 18
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500
505
503
55
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2, 8, 8, 18
2, 4, 6, 8
2, 14, 26, 28
2, 2, 8, 12
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Cl, P, Co, So, Ni, I
Cl, K, Cu, Na, N, Fe
Cl, K, Co, So, N, Fe
Cl, Po, Co, Na, N, Fe
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Negative ion
Positive ion
Polyatomic ion
Neutral ion
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5
8
9
13
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Valences
Ions
Isotopes
Molecules
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There are approximately 118 identified elements
An element is defined by its number of electrons - this is how elements are ordered in the periodic table
An element's atomic number indicates its number of protons
You can find an element's neutrons by subtracting the number of protons from the atomic mass
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Mass cannot be created but it can be destroyed under extreme pressures.
When added to a system, energy can destroy mass.
The mass of a closed system cannot change over time; mass cannot be created nor destroyed.
Mass cannot be conserved during a chemical reaction; a little bit of mass is always lost.
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The gases released
The reactants
The solids put into the reaction
The whole system
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A combination of two protons and two electrons
A combination of two or more chemical elements bonded together
A mixture of two or more chemical elements
Any substance that contains chemically bonded particles
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Sea water
Distilled water
Iron oxide
Oxygen
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Electrons
Occupied shells
Protons
Valence electrons
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2
2, 7
2, 8, 2
2, 8, 7
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Single atoms
Molecules
Compound
Element
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To eliminate all measurement errors.
To change data as necessary.
To make sure you prove the law.
To know the level of accuracy of your measurements.
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Single atoms
Molecules
Elements
Mixture
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It is positively charged
It is negatively charged
It is the location of protons
It is the location of electrons
It is the location of neutrons
It contains most of the mass of an atom
It contains most of the volume of an atom
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Single atoms
Molecules
Compound
Element
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