grade 9 revision ( unit one )
Quiz
•
Science
•
9th Grade
•
Practice Problem
•
Easy
Waleed Elhady
Used 5+ times
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35 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
It is the breaking up of bonds in molecules of the reactants and formation of new bonds in the molecules of resultants (products) from the reaction.
Chemical reaction rate
Chemical compound
Chemical reaction
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
It is the arrangement of metals in a descending order according to the degree of their chemical activity.
Chemical reaction
Chemical activity series
Chemical reaction rate
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
They are chemical reactions in which double substitution (exchange) occurs between the ions (radicals) of two different compounds to give two other new compounds.
Double substitution reactions
single substitution reactions
substitution reactions
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A chemical process which causes the decrease in the oxygen percentage or the increase in the hydrogen percentage in a substance.
painting process
reduction process
Oxidation process
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
It is the substance which gives oxygen or takes hydrogen away during a chemical reaction.
Oxidizing processes
Oxidizing agent (factor)
reducing agent (factor)
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
It is the change in the concentration of the reactants and the resultants in a unit time.
The speed of physical change
The chemical reaction
The speed of chemical reaction
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
They are chemical reactions in which the catalyst increases their speeds.
Positive catalytic reactions
negative catalytic reactions
Positive reactions
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