Transcript Does mass change when bonds are formed?

Tuesday, 29 March 2016
Does mass change when bonds
are formed?
L.O: To understand a hypothesis and a
prediction and represent data in a
graph
Spot the mistakes in these graphs
Water loss (ml)
10
8
pH
6
4
2
0
0 2
4
6
8 10 12 14
8
8
6
6
5
4
3
2
1
0
Number of leaves
40
2.5
30
Height (m)
Gas Produced (ml)
time
0
30 23
40 49
50
0 610 1020 11
20
10
0
2
1.5
1
0.5
0 2
4
6
8 10 12 14
Time (m)
0
0 5 10 15 20 25
Age (years)
A HYPOTHESIS is a proposal to explain certain
facts or observations
A PREDICTION is a suggestion stating what will happen in
the future based on an observation, theory or hypothesis
A bathroom light doesn’t work.
Which of these are predictions and which are
hypotheses?
If the light bulb is replaced it will
work
The lightbulb in the bathroom
might not work because the
power to the house is off
If every electrical appliance in the
house doesn’t work there is no
power to the house and the lightbulb
won’t work
Tuesday, 29 March 2016
The lightbulb in the bathroom
might not work because there
could be a short in the circuit
The lightbulb doesn’t work
because the bulb is burnt out
The lightbulb will work after the
fuse is changed
A HYPOTHESIS is a proposal to explain certain
facts or observations
A PREDICTION is a suggestion stating what will happen in
the future based on an observation, theory or hypothesis
Garden plants wont grow
Which of these are predictions and which are
hypotheses?
If a fertiliser is added the plant will
grow
The plant might not grow if it
doesn’t have enough water
If I spray a pesticide on the plant it
will grow
The plant might not grow because
the soil is lacking in nutrients
The plant won’t grow if it has
pests
If I water the plant it will grow
Teachers Hypothesis – If you have a larger mass
of a reactant, then a larger mass of products
must be made as more atoms will be bonding
Each pair in the class will be given a different mass of copper. The
copper reacts with oxygen when heated over a bunsen. You will
then need to weigh the copper oxide to find out how much has
been formed and compare the mass change to others in the class
Can you draw a sketch graph to
show what you think the pattern
will be?
Mass of copper
oxide
What is your
prediction?
Mass of copper
Variables
What shape will the graph be if a group 1
The metal
independent
variable
was used?
is the one that you change or select.
Why couldn’t we use group 1 metals?
The dependent variable
is the one changes as a result,
and that you measure.
The control variables must not change,
so that it is a fair test.