Which of the following changes would not speed up a chemical reaction?
N5 Chemistry MC 2018

Quiz
•
Chemistry
•
9th - 12th Grade
•
Medium
Donna Kirk
Used 5+ times
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25 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Increasing the particle size
Increasing the temperature
Increasing the concentration
Addition of a catalyst
Answer explanation
Increasing the particle size decreases the surface area, and will therefore slow down a chemical reaction.
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which line in the table identifies the correct location of a proton and an electron in an atom?
A
B
C
D
Answer explanation
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following elements does not exist as diatomic molecules?
Oxygen
Helium
Bromine
Hydrogen
Answer explanation
Helium is a (monatomic) noble gas
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The shapes of some molecules are shown below. The shape of a molecule of hydrogen bromide is likely to be
tetrahedral
trigonal pyramidal
angular
linear
Answer explanation
Hydrogen bromide has the formula HBr using the cross-over rule.
The correct structure for this can only be linear.
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following elements forms an ion with a single positive charge and an electron arrangement of 2,8?
You may wish to use the data booklet to help you.
Sodium
Magnesium
Fluorine
Neon
Answer explanation
A Na atoms have electron arrangement 2,8,1 - Na+ ions have arrangement 2,8
B Mg atoms have electron arrangement 2,8,2 - Mg+ ions have arrangement 2,8,1
C F atoms have electron arrangement 2,7 - F+ ions have arrangement 2,6
D Ne atoms have electron arrangement 2,8 - Na+ ions have arrangement 2,7
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which line in the table shows the properties of a covalent network compound?
A
B
C
D
Answer explanation
A Bonding type is covalent molecular as it does not conduct and has low mpt/bpt
B Bonding type is ionic as is does not conduct as solid but does conduct as liquid
C Bonding type is metallic as it conducts both as a solid and a liquid
D Bonding type is covalent network as it does no conduct and has very high mpt
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
0·1 mol of sodium hydroxide was dissolved in water and the solution made up to 250 cm3.
What is the concentration, in mol l-1, of the sodium hydroxide solution?
0·0004
0·025
0·4
2·5
Answer explanation
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