Science 7 Module 1 Solutions powerpoint presentation

2. What common properties do
solutions have?
Are solutions always liquid?
Will all solids dissolve in water?
How fast do solids dissolve in
water
?
Key Questions for Module 1

3. A solution is not always a liquid and it
may either be found in nature or
processed for a specific purpose.
Components of the solution (solute and
solvent) have already been described.

4. Objectives
1. compare the evidence gathered with
the predictions you made
2. identify the solute and the solvent in a
solution
3. describe two ways of identifying a
solution
4. differentiate an unsaturated from a
saturated solution (for Activity 3)

5. 1. Refer to revisions found in Student Module
1, pages 4-6.

6.  Solutions
1. Have one phase only; well mixed;
homogeneous; all parts of the solution
appear the same
2. Solute cannot be separated from solvent by
filtration
3. Clear and transparent, whether colorless or
colored

7.  Activities 4 to 6 deal with factors affecting
solubility.
 Before working on Activity 4, which is a semi-
structured or guided investigation, clarify and
describe the following terms:
 hypothesis
 dependent variable
 independent variable
 control variable
 fair test

8.  Hypothesis
◦ A possible explanation to what will
happen
◦ Possible answer you will try to prove or
disprove
 Dependent variable
◦ What is measured and affected in an
experiment
◦ The change that occurs due to the
independent variable
◦ The “what will happen” in an experiment

9.  Independent variable
◦ What is changed in an experiment directly
caused by the experimenter
◦ The “what you do” in the experiment
 Control variable
◦ Factor or condition that can influence the
dependent variable in an experiment
◦ What is kept the same in an experiment

10. A fair test is making sure that in an
experiment, one factor or condition (the
independent variable) affects another (the
dependent variable) by keeping all other
conditions constant or the same.