Topic 2 Chemical Changes Flashcards
4 steps when lighting a Bunsen Burner
- Attach rubber tubing to the gas tap
- Move the collar until the air hole is 1/3 open
- Light a wooden splint and hold it above the chimney
- Turn on gas by moving the gas tap to open
Name and spell the 5 parts of the Bunsen Burner shown in the diagram.
A = Barrel/Chimney
B = Regulating collar
C = Air hole with jet inside
D = Gas tubing
E = Base
Colour of flame when air hole fully open and 2 other observations
Two toned blue,
Roaring
Hard to see
Colour and 2 other observations when the air hole is fully closed
Yellow-Orange flame
Quiet
Easy to see
Colour of flame when the air hole is 1/3 open
Yellow flame tinged with blue
Colour of flame with sodium
Yellow
Colour of flame with potassium
Lilac
Colour of flame with strontium
Crimson red
Colour of flame with calcium
Brick red
Colour of flame with copper
Blue/green
Flame colour with barium
Apple green
Name the 3 states of matter
solid
liquid
gas
What are the missing labels in the the changes of state diagram?
A reversible change is…
A change when something is heated that can be changed back on cooling.
An irreversible change is
A change on heating that cannot be changed back on cooling
Give 3 irreversible changes
magnesium burning or other chemical reaction
wooden splint burning
bread burning or other food cooking
Give 3 reversible changes
Changes of state e.g. Ice melting or water boiling/freezing or steaming condensing
Candle wax melting
Sugar/salt dissolving
Definition of Soluble
When a substance disolves
Defintion of Insoluble
When a substance does not dissolve
Definition of Solute
A solid that dissolves in a liquid
Definition of Solvent
A liquid that dissolves a solid
Definition of Solution
A liquid formed when a solute dissolves in a solvent
Draw and label a diagram showing filtration apparatus
Draw and label a diagram showing evaporation apparatus
When drawing a graph of solubility at different temperatures, what should the label read along the (i) x-axis and (ii) y-axis
x-axis = temperature / oC
y-axis = solubility / g/100g water
What should you remember when drawing a graph?
Use a pencil and a ruler
Label axis and include units
Use dots with circles for the data points
Smooth single curve/line
Draw and label a fire triangle
What is the appearance of paper (i) before and (ii) after burning?
Before - white paper
After - dark grey ash
Describe what happens when magnesium burns
Bright white flame
Silver metal turns into a white ash
