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.
BLM 5.1a, 5.1b
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
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
EXAMPLE: melting ice
CHEMICAL CHANGE – a change in a substance which does produce a new substance.
EXAMPLE: match burning
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
Q1 – classify each of the following as a pure substance or a mixture
A) soapy water
B) hydrogen gas
C) sodium chloride
Classify each of the following as an element or a compound.
B) potassium carbonate
Classify each of the following as a physical property or a chemical property.
A) Gasoline is a clear pink solution
B) Gasoline burns in air
C) Water boils at 1100C.
D) electric current can split water into hydrogen and oxygen gases
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
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
Describe the chemical tests that can be used to identify the following gases.
a flaming wooden splint causes a “pop”
a glowing wooden splint relights (bursts into flame)
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)
Changes the colour of cobalt chloride test paper from blue to pink
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?
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 )