Hello Parents,
The grade fives will be having a Science Test on Friday, January 30th. I've sent out a review sheet, but just in case it doesn't reach you I am also posting the information here.
We will be reviewing this information on Thursday.
Science Quiz Study Sheet: Mixtures of Solids and Liquids (Friday, January 30th)
You should study all of the experiments that we have covered in science class so far:
· Sweet & Sour Experiment (mixing lemon juice, sugar and water)
· Mixing Liquids (mixing liquids together)
· Liquid Layers (demonstration done by Mrs. Friesen)
· Designing a Fair Test (dissolving a lifesaver)
· Solution to Recovery 1&2 (mixing liquids and solids)
Definitions to know:
Mixture: a number of pure substances brought together, the molecules or atoms are different
Pure substance: all of the atoms or molecules are the same. Example/ gold, pure water, salt
Solution: a homogeneous (even) mixture in which the molecules are evenly dispersed. Example/ when sugar dissolves in water and you can no longer see it.
Suspension: A heterogeneous (uneven) mixture in which the molecules are unevenly dispersed, very small particles of a solid remain suspended without dissolving. Example/ when we mixed corn starch in water and the cornstarch eventually sank to the bottom.
There are 3 ways (covered in class) of separating solids and liquids:
1. Filter - when a mixture forms a suspension it can be poured into a filtering system. The water will pass through the filter but the insoluble(won’t dissolve) substance will collect on the filter
2. Evaporating - when a mixture forms a suspension or solutions, the solid can be recovered by evaporating the water. The water is lost into the air as it evaporates while the solid remains behind forming a residue
3. Decanting - when a mixture forms a suspension the solid can be recovered by allowing it to settle to the bottom and then pouring off the water and letting the wet residue dry out.
There are 4 ways (covered in class) of separating solids:
1. Sieve - various gauges of sieves can be used to separate different sizes of solid particles
2. Magnets - magnetic substances can be separated from non-magnetic substances
3. Wind - lighter substances that can be moved by a light breeze can be separated from heavier substances that fall straight down
4. Water - floating materials can be separated from materials that sink in water
Scientific Method:
1. Question (what will happen if…?)
2. Hypothesis (make an educated guess of what you think will happen)
3. Materials (what will you need?)
4. Procedure (how will you carry out the experiment?)
5. Observations (what happened?)
6. Inference/ Conclusion (why did it happen that way?)
Questions:
· Why is it important that scientist follow the scientific method?
· How many variables (temperature of the water, liquid) are scientists allowed to change in an experiment?
· Why is it important that scientists share their research and experiments with other scientists?
