Year 9 Chemistry Mid Unit Revision

25 Questions | By Elambin | Last updated: Jun 7, 2017 | Total Attempts: 66

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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