ENERGETICS [dchemlc]

ENERGETICS [dchemlc]

9th Grade

10 Qs

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ENERGETICS [dchemlc]

ENERGETICS [dchemlc]

Assessment

Quiz

Chemistry

9th Grade

Practice Problem

Easy

Created by

Miyuni Thisanga De Almeida

Used 1+ times

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10 questions

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1.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Media Image

A reaction that gives out heat to the surroundings is said to be _______________.

Answer explanation

Media Image

Some chemical reactions give out energy in the form of heat. A reaction that gives out heat to the surroundings is said to be exothermic. If you are holding a test-tube in which an exothermic reaction is occurring, you will notice that the test-tube gets warmer.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

Which of the following is not an exothermic reaction?

Combustion reaction

Displacement reaction

Thermal decomposition reaction

Neutralization reaction

Answer explanation

Media Image

Any reaction that produces a flame is exothermic. apart from combustion reactions, other exothermic changes include:

• the reactions of metals with acids

• neutralization reactions

• displacement reactions.

Thermal decomposition is an endothermic reaction

3.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Media Image

The amount of heat energy taken in or released in a chemical reaction can be measured.

This energy is known as the _____________ of the reaction.

Answer explanation

Media Image

It is the difference between the energy of the products and the energy of the reactants. enthalpy change is given a minus or a plus sign to show whether heat is being given out or absorbed by the reaction. You always look at it from the point of view of the reactants.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

What is the unit used to measure enthalpy change?

kJ/mol

J/mol

J/Kg

J/g

Answer explanation

Media Image

enthalpy change is measured in units of kJ/mol (kilojoules per mole).

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

If the combustion of ethanol was complete, carbon dioxide should be produced instead of carbon and the colour of the flame should be _______

blue

yellow

white

orange

Answer explanation

Media Image

6.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Media Image

A reaction that absorbs heat from the surroundings is said to be __________

Answer explanation

Media Image

7.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Media Image

the amount of heat needed to raise the temperature of 1 gram of a substance by 10C is known as_____________.

Answer explanation

Media Image

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