grade 9 revision ( unit one )

grade 9 revision ( unit one )

9th Grade

35 Qs

quiz-placeholder

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grade 9 revision ( unit one )

grade 9 revision ( unit one )

Assessment

Quiz

Science

9th Grade

Practice Problem

Easy

Created by

Waleed Elhady

Used 5+ times

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35 questions

Show all answers

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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