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CHEMICALS AND CHEMICAL CHANGE. Chapter 5.1 BLM 5.1a, 5.1b. Chemicals and chemical Change. CHEMISTRY – is the study of matter, its changes and its properties MATTER – is anything that has mass and takes up space ATOM – the smallest particle of matter. HANDOUT 5.1a.

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chemicals and chemical change

CHEMICALS AND CHEMICAL CHANGE

Chapter 5.1

BLM 5.1a, 5.1b

chemicals and chemical change2
Chemicals and chemical Change

CHEMISTRY – is the study of matter, its changes and its properties

MATTER – is anything that has mass and takes up space

ATOM – the smallest particle of matter

handout 5 1a
HANDOUT 5.1a

Use the following labels and pages 172 – 173 to complete the handout

Chemical changes, C , heterogeneous mixtures, elements, pure substances (x2), atoms (x2), NaCl, chemical formulas, chemical symbols, physical changes, O, solutions, H2O, molecules, O2 , compounds

slide4

Pure

Substance

Heterogeneous

Mixture

Elements

Compounds

Pure

Substance

Chemical

Symbols

Chemical

Formulas

Solutions

Molecules

Atoms

O

C

NaCl

H2O

Atoms

Physical

Changes

O2

Chemical

Changes

slide5
PHYSICAL CHANGE – a change in a substance which does not produce a new substance.

EXAMPLE: melting ice

CHEMICAL CHANGE – a change in a substance which does produce a new substance.

EXAMPLE: match burning

signs of a chemical change
Signs of a Chemical Change
  • Colour change
  • Energy given off (heat or light)
  • Gas formed
  • Precipitate formed
  • Tough to reverse
handout 5 1b
HANDOUT 5.1b

Use the following labels and pages 173 – 174 to complete the handout

Rusting/corrosion, difficult to reverse, water vapour, turns cloudy, new colour, reactants, pops, oxygen (x2), turns pink, products, precipitate, carbon dioxide, bursts into flames, heat or light, hydrogen

slide8

Corrosion

or Rusting

Reactants

Products

Oxygen

Colour

Change

Tough

toreverse

Energy

Given off

Precipitate

forms

O2

CO2

H2O

H2

Turns

Cloudy

Turns

Pink

Bursts into

Flames

Pops

homework questions
HOMEWORK QUESTIONS
  • Page 175
  • QUESTIONS: #1,2,4,5,6,7
solutions to homework questions
SOLUTIONS TO HOMEWORK QUESTIONS

Q1 – classify each of the following as a pure substance or a mixture

A) soapy water

MIXTURE

B) hydrogen gas

PURE SUBSTANCE

C) sodium chloride

PURE SUBSTANCE

question 2
QUESTION2

Classify each of the following as an element or a compound.

A) hydrogen

ELEMENT

B) potassium carbonate

COMPOUND

C) water

COMPOUND

D) Mg

ELEMENT

question 4
QUESTION 4

Classify each of the following as a physical property or a chemical property.

A) Gasoline is a clear pink solution

PHYSICAL PROPERTY

B) Gasoline burns in air

CHEMICAL PROPERTY

C) Water boils at 1100C.

PHYSICAL PROPERTY

D) electric current can split water into hydrogen and oxygen gases

CHEMICAL PROPERTY

question 5
QUESTION 5

When aluminum metal is added to hydrobromic acid, hydrogen gas and an aluminum bromide solution are formed.

A) What kind of change has occurred?

Chemical, bubbles formed, new substance made

question 514
QUESTION 5

When aluminum metal is added to hydrobromic acid, hydrogen gas and an aluminum bromide solution are formed

B) Which substances are the reactants and which are the products?

Reactants – Aluminum and Acid

Products – Hydrogen + Aluminum Bromide

question 6
QUESTION 6

Describe the chemical tests that can be used to identify the following gases.

A) hydrogen

a flaming wooden splint causes a “pop”

B) Oxygen

a glowing wooden splint relights (bursts into flame)

question 616
QUESTION 6

C) Carbon Dioxide

A burning wooden splint extinguishes, OR when the gas is bubbled through limewater, the limewater changes from a clear, colourless solution to a cloudy white liquid (a precipitate is formed)

question 617
QUESTION 6

Water Vapour

Changes the colour of cobalt chloride test paper from blue to pink

question 7
QUESTION 7

When sodium carbonate is added to water, the sodium carbonate dissolves. When hydrochloric acid is added to the solution, the solution fizzes. What kinds of changes have occurred?

question 7 answer
QUESTION 7 - ANSWER

When sodium carbonate dissolves in water it is a physical change

A chemical change happens when gas is formed after hydrochloric acid is added ( fizz / Bubbles )