Year 9 Chemistry Mid Unit Revision
.
- 1.The positively charged particle in an atom is the:
- A.
Protons
- B.
Neutrons
- C.
Electrons
- D.
Orbitals
- 2.The maximum numbers of electrons in the first four energy levels of an atom are:
- A.
2, 8, 8, 18
- B.
2, 4, 6, 8
- C.
2, 14, 26, 28
- D.
2, 2, 8, 12
- 3.When an atom loses an electron, it becomes a:
- A.
Negative ion
- B.
Positive ion
- C.
Polyatomic ion
- D.
Neutral ion
- 4.
Which of the following terms could be used to describe the matter in this image?- A.
Single atoms
- B.
Molecules
- C.
Compound
- D.
Element
- 5.
Which of the following terms could be used to describe the matter in this image?
- A.
Single atoms
- B.
Molecules
- C.
Compound
- D.
Element
- 6.
Which of the following terms could be used to describe the matter in this image?
- A.
Single atoms
- B.
Molecules
- C.
Elements
- D.
Mixture
- 7.Which of the following word equations is correct for a reaction between copper and oxygen?
- A.
Copper + oxygen -> carbon dioxide
- B.
Copper + oxygen -> copper sulfide
- C.
Copper + oxygen -> copper oxide
- D.
Copper + oxygen -> copper iodide
- 8.The chemical symbols of chlorine, potassium, copper, sodium, nitrogen and iron in order are:
- A.
Cl, P, Co, So, Ni, I
- B.
Cl, K, Cu, Na, N, Fe
- C.
Cl, K, Co, So, N, Fe
- D.
Cl, Po, Co, Na, N, Fe
- 9.What is a chemical compound?
- A.
A combination of two protons and two electrons
- B.
A combination of two or more chemical elements bonded together
- C.
A mixture of two or more chemical elements
- D.
Any substance that contains chemically bonded particles
- 10.Which one of the following is a mixture?
- A.
Sea water
- B.
Distilled water
- C.
Iron oxide
- D.
Oxygen
- 11.Natural gas is mainly methane (CH4). What two elements are found in methane?
- A.
Cobolt and helium
- B.
Copper and holmium
- C.
Carbon and hydrogen
- D.
Carbon and helium
- 12.Which of the following statements is NOT true?
- A.
There are approximately 118 identified elements
- B.
An element is defined by its number of electrons - this is how elements are ordered in the periodic table
- C.
An element's atomic number indicates its number of protons
- D.
You can find an element's neutrons by subtracting the number of protons from the atomic mass
- 13.Cadmium's atomic number is ______________. Thus, an atom of cadmium has ___________ protons and ___________ electrons. If cadmium has 64 neutrons, its mass number is ___________.
- 14.A beryllium atom has 4 protons, 5 neutrons, and 4 electrons. What is the mass of this atom?
- A.
5
- B.
8
- C.
9
- D.
13
- 15.Which electronic structure is correct for an element with 17 electrons?
- A.
1,7
- B.
10, 7
- C.
2, 8, 7
- D.
2, 8, 8, 18
- 16.What do the elements in a group have the same number of?
- A.
Electrons
- B.
Occupied shells
- C.
Protons
- D.
Valence electrons
- 17.Which of these electronic structures belongs to a noble gas?
- A.
2
- B.
2, 7
- C.
2, 8, 2
- D.
2, 8, 7
- 18.Following the law of conservation of mass, if a student mixes 250g of sugar, 250g of water and 5g of colouring, the product will have a mass of:
- A.
500
- B.
505
- C.
503
- D.
55
- 19.Which of the following statements best defines the law of conservation of mass?
- A.
Mass cannot be created but it can be destroyed under extreme pressures.
- B.
When added to a system, energy can destroy mass.
- C.
The mass of a closed system cannot change over time; mass cannot be created nor destroyed.
- D.
Mass cannot be conserved during a chemical reaction; a little bit of mass is always lost.
- 20.Why is it important to know the 'sensitivity' of your balance when doing a conservation of matter experiment?
- A.
To eliminate all measurement errors.
- B.
To change data as necessary.
- C.
To make sure you prove the law.
- D.
To know the level of accuracy of your measurements.
- 21.In a chemical reaction, the mass of the products must always equal the mass of:
- A.
The gases released
- B.
The reactants
- C.
The solids put into the reaction
- D.
The whole system
- 22.
Which of the following correctly match the X in this atom?
- A.
It is positively charged
- B.
It is negatively charged
- C.
It is the location of protons
- D.
It is the location of electrons
- E.
It is the location of neutrons
- F.
It contains most of the mass of an atom
- G.
It contains most of the volume of an atom
- 23.¹⁴₆C and ¹²₆C are examples of carbon:
- A.
Valences
- B.
Ions
- C.
Isotopes
- D.
Molecules
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