Year 8 Homework 12/1/22 OALH

Last updated about 4 years ago

13 questions

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Year 8 Homework 12/1/22 OALH

Last updated about 4 years ago

13 questions

Question 1

Draw the electron configuration of a sodium atom.

Question 2

In chemical reactions...

Energy is released as atoms are rearranged

Energy is transferred as atoms are rearranged

Energy is created as atoms are rearranged

Question 3

An exothermic reaction is one that takes energy in from its surroundings.

True

False

Question 4

An example of uses of exothermic reactions are…

Hand warmers

Sport injury pack

Question 5

An endothermic reaction is a reaction that takes energy in from its surroundings

True

False

Question 6

An example of an endothermic reaction is...

Sports injury packs

Hand warmers

Question 7

Explain how you can tell if an experiment is exothermic or endothermic using a thermometer.

Question 8

What do the symbols (s), (l), (g) and (aq) stand for?

Draggable item		Corresponding Item
(s)		Solid
(l)		Liquid
(g)		Gas
(aq)		Aqueous

Question 9

How do we represent chemical reactions?

By writing chemical sums

By adding the chemicals together

By writing word and symbol equations

Question 10

10.

Where do we write the reactants?

Left

Right

Question 11

11.

Where do we write the products?

Left

Right

Question 12

12.

Write the word equation for the reaction between Iron and Oxygen

Challenge

Question 13

13.

Complete the symbol equation for the reaction: copper + oxygen ---> copper oxide