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Duncanrig Secondary Chemistry Department

Name: Class:

S2/3 ChemistryElements, Compounds and

Mixtures

Pupil BookletLearning OutcomesHomework ExercisesUnit Summary

SCN 3-15aI have developed my knowledge of the Periodic Table by considering the properties and uses of a variety of elements relative to their positions.

SCN 2-15aBy contributing to investigations into familiar changes in substances to produce other substances, I can describe how their characteristics have changed.

SCN 3-15bHaving contributed to a variety of practical activities to make and break down compounds, I can describe examples of how the properties of compounds are different from their constituent elements

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Learning Outcomes Can you do this?

1. State the definition of the term Element

2. State roughly the number of elements present on the periodic table.

3. Identify the location of metals and non metals on the periodic table

4. Describe some of the common properties of most metal elements

5. Describe the common properties of most non-metal elements

6. Describe an experiment to test whether a substance is a metal or a non-metal

7. State the signs that a chemical reaction has taken place.

8. State that a new product is always formed during a chemical reaction

9. Describe examples of chemical reactions that occur in everyday life.

10. State what is meant by the term Compound


11. Understand the relationship between reactions and energy

12. Be able to write a word equation for a simple chemical reaction

13. Write word equations from descriptions of chemical reactions

14. State what is meant by + and in word equations.

15. State what is meant by a mixture

16. Describe the difference between a compound and a mixture

17. Identify the elements present in a compound from its name

18. State the name of a compound that can be formed using different combinations of elements.

Areas to study

Elements, Compounds and Mixtures Homework 1

1. Copy and complete the following sentences using the words below:

Substances that are made of one type of ________ and cannot be broken down into simpler substances are called __________.


There are about ______ of these substances, and they can be organised into the ________ table. Each element can be described either as a ________or a __________ and all are represented on the periodic table by a unique ________.

metal 100 periodic non-metal symbol elements atom

2. Identify the elements from the list of substances below:

Salt water gold lead iron bronze air oxygen neon carbon methane uranium

3. Metals and non-metals have different properties from each other, which allow us to identify which is which. State whether the following substances are likely to be a metal or a non-metal:

a) Strong, shiny solid that is a good conductor of heat.

b) Yellow solid that does not conduct electricity and breaks easily.

c) A liquid at room temperature that conducts electricity and heat.

Homework 1 Answers



1 a) State three observations that suggest a chemical reaction has taken place.

b) Identify which of the following changes are chemical reactions:

Rusting of a car Lighting a Bunsen burner Ice melting Rotting bananas Boiling water Baking a cake Dissolving sugar in tea Mixing sand and water


2. a) Describe the difference between an element and a compound.

b) Identify the elements present in each of the following compounds:

Sodium chloride Magnesium sulfate Lead carbide Calcium hydride Lithium cyanide Iron hydroxide Potassium sulfite

Homework 2 Answers



1. Suggest names for compounds containing the following elements:

a) Lead and oxygen onlyb) Lithium and hydrogen onlyc) Calcium and chlorine onlyd) Potassium, sulphur and oxygen onlye) Hydrogen, carbon and nitrogen onlyf) Sodium, hydrogen and oxygen only

2. Write a word equation for the following chemical reactions:

a) Magnesium ribbon reacts with oxygen to produce a white powder, magnesium oxide

b) Copper chloride is formed when copper metal is placed in a jar of chlorine gas.

c) Calcium chloride and water is produced by the reaction of hydrochloric acid and calcium carbonate. Bubbles of carbon dioxide gas are also observed during the reaction.

3. a) Explain how a mixture differs from a compound

b) Give an example of a mixture and describe an experiment you could carry out separate the mixture.


c) Describe an experiment that could be carried out to break up a solution of magnesium chloride.

Homework 3 Answers

Homework 3 Answers


Elements, Compounds and Mixtures - Summary

Fill in the missing words by choosing the correct word from the box.

effervescence capital glowing separate atom right

non-metals solid mercury colour mixture left

substance Periodic Table element natural 100 liquid

gas chloride precipitate symbol solid new

An 1--------------- is the simplest type of chemical substance.

An element is made up of only one type of 2------------.

There are just over 3------ elements and they are listed

on a chart called the 4------------- ------------.

Elements can be classified as:

Metals/5---------------

Solids/Liquids/6 ---------

7---------------/Man-made

Metals are found at the 8-------------- hand side of the

Periodic Table


Non-metals are found at the 9------------- hand side of

the Periodic Table

10---------------- and Bromine are examples of elements

which are 11----------------------- at room temperature.

Each element is represented by a 12-------------------.

The first letter is always a 13--------------- letter. The second letter (if any) is always a small letter.

There are a number of changes that occur during a chemical reaction which prove a reaction has taken place. Examples of these are:

14-------------------- change,

15------------- given off,

energy being taken in or given out,

16-------------------- being formed

changes in smell.


Some chemical reactions have special names:

17-------------------- means bubbling or fizzing

Precipitation is when a 18-------------------- is produced from solutions

A chemical reaction always produces at least one

19------------- substance.

positive chemical filtration energy changes negative

mixture properties chlorine oxygen add

chemical reactants compounds evaporation

chloride products separate electric

Everything in the world is built from elements.

Different elements join together to make 20---------------

A compound has different 21-------------------- from its elements.


Copper + Chlorine → Copper 22----------------

(brown metal) (green gas) (blue solid)

If substances are simply mixed together, without

joining together in a 23-------------- reaction, they will

have the same properties and should be fairly easy to

24------------------. This is called a mixture.

Air is a 25--------------- of gas.

A mixture of sand and water can be separated by

26--------------------.

A mixture of salt and water can be separated by

27--------------------.

Copper chloride can be separated into copper and


28------------- by passing an 29-------------- current

through the solution.

Copper is formed at the 30------------ electrode.

Bubbles of chlorine gas form at the 31-------------------

electrode.

The name of a compound tells us the elements present in it:

IDE endings – 2 elements obvious in the name.

ATE endings – 2 elements obvious in the name

AND 32----------------

The 33----------------- formula shows the symbols of elements that have joined together in a chemical reaction:

H2O 2 hydrogen atoms 1 oxygen atom

A chemical equation tells us the substances that are


present at the start, (the 28-----------------) and what is

formed, (the 34-----------------) at the end of the reaction.

In an equation the ‘+’ means 35----------------- and

the ‘36------‘ means changes into or reacts to give

An equation does not give any information about any

37------------- ------------------- that occur or the rate of

reaction.

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