18th November, 2024
Classwork
Answer the following Questions in your school notebook
MULTIPLE CHOICE
1. Which of these would cause hydrated iron oxide to form on iron?
A. Warmth and water
B. Salt water and warmth
C. Warmth and oxygen
D. Water and oxygen
2. The diagram represents the general structure of a solid Z.
What is solid Z?
A. Aluminum
B.
Lithium
C. Silicon dioxide
D. Calcium
3. Hydrogen chloride gas, HCl, reacts with ammonia gas, NH3, to form solid ammonium chloride. The
apparatus is set up as shown. After a few minutes, solid ammonium chloride forms where the two
gases meet after diffusing.
Where does the solid ammonium chloride form after diffusion of the two gases?
4. Which of the following is not a property of substances with covalent bonding?
A. They have low melting point
B. They possess regular and patterned Crystalline lattices
C. They do not onduct electricity
D. They are insoluble in water
5. The nitride ion has a negative charge.
Which one of the following is the electron structure of the nitride ion?
A. 2, 7
B. 2, 5
C. 2, 8
D. 2,8,8
THEORY
1. Below are some ions of metals and non-metals.
Ca+2
Al+3
S-2
NO3-
Cl-
SO4-2
Use the ions above and work out the chemical formula of;
A. Calcium nitrate
B. Aluminium chloride
C. Calcium hydroxide
D. Aluminium sulphate
E. Aluminium sulphide
2. Complete the outer shell dot and cross atomic diagram to show a molecule of hydrogen peroxide,
H2O2.
Use o to represent electrons in HYDROGEN atom
Use x to represent electrons in OXYGEN atom
i.
ii.
iii.
How many lone electron pairs are in a molecule of ammonia?
How many shared electrons are in a molecule of ammonia?
What is the total number of electrons in a molecule of ammonia?
iv.
How many covalent bonds are present in a molecule of ammonia?
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