Science NWIS 6.1,6,2 Revision
Quiz
•
Science
•
8th Grade
•
Practice Problem
•
Easy

Ifthikhar Rizvi
Used 1+ times
FREE Resource
13 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why does the powdering of calcium carbonate increase the speed of its reaction with an acid?
It increases the mass of calcium carbonate.
It increases the surface area of the calcium carbonate
The powder becomes more concentrated.
The powder floats on top of the acid.
2.
FILL IN THE BLANK QUESTION
1 min • 1 pt
What does the symbol ⇌ mean?
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The solvent ethanol is produced by the formation of sugar, using yeast. Which graph correctly shows how the speed of fermentation changes with temperature?
A
B
C
D
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Oxygen is formed when manganese (IV) oxide is added to hydrogen peroxide, H2O2. 2H2O2→ 2H2O + O2 In this reaction, manganese (IV) oxide acts as
acid
base
catalyst
drying agent
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
1. When lumps of calcium carbonate react with hydrochloric acid, carbon dioxide gas is released. CaCO3(s) + 2HCl(aq) → CaCl2 (aq) + CO2 (g) + H2O(l) what will the following have on the rate of reaction , Increasing temp
None of the above
Slower
Faster
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which changes of condition slow down the reaction between magnesium and air? 1. Heating the magnesium to a higher temp, 2. using a higher proportion of oxygen in the air, 3. using magnesium ribbon instead of powdered magnesium
1
2
3
all of the above
7.
FILL IN THE BLANK QUESTION
1 min • 1 pt
How many elements are in the periodic table?
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