Classroom Chemistry. Grade 5 Science Mr. Larson
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1 Classroom Chemistry Grade 5 Science Mr. Larson
2 Student Learner Expectations
3 Safety Rules Do not let chemicals come in contact with your skin Rinse well, if you do get chemicals on yourself. Wipe up spills immediately. Wash your hands with soap Never taste chemicals. Waft, when smelling.
4 Matter Matter is the substance of which physical objects are composed. It can be solid, liquid or gas.
5 Solids Molecules are attached and bunched together in a solid form. Doesn t change shape easily. Another solid cannot pass through easily
6 Liquid Molecules fill the space of the container they are in. They can shape easily. A solid can pass through it.
7 Gas Molecules freely move around. They are not closely bound together. Changes shape easily A solid can pass through it easily.
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9 Changes of State Solid to Liquid- Melting Liquid to Solid- Freezing Liquid to Gas- Evaporation Gas to Liquid- Condensation
10 Mixtures Matter can generally be mixed with other types of matter. A mixture is when particles of one substance mixes with particles of another substance. They are generally pure substances.
11 Where do we see mixtures? Brainstorm as a small group. Examples: recipes, construction-concrete, water, lemonade, salad dressings. BLM #1
12 Separating Mixtures How can you separate substances from a mixture? BLM #2 Methods of Separating: sieves, magnets, air, water, evaporation, distilling, filtering
13 Separating Mixtures In groups, complete BLM #2 See if you can separate the mixture you are given.
14 Methods of Separating Sieves: can be used to separate solids. Magnets: can pick magnetic objects, from non-magnetic.
15 Methods of Separating Air: you can blow away lighter substances, to leave heavier ones. Water: some substances will float or sink based on their buoyancy.
16 Methods of Separating Evaporation: evaporate the liquid and leave the solid. Distilling: the processing of vaporizing into gas and then condensing back into a liquid
17 Methods of Separating Filtration: using a filter and pouring the liquid through to separate the solid. /ages/10_11/rev_irrev_changes.shtml
18 BLM #3 and #4 Mixing Liquids Some liquids mix completely and are unable to be separated. eg: Milk and Tea Some liquids do not dissolve in others and are more buoyant. eg: oil and water Some liquids are heavier, less buoyant and settle on the bottom. eg: syrup
19 Mixing Liquids Some liquids react to each other. Eg: vinegar and milk. Some liquids are able to dissolve solids, while some are not. Lemonade is an example of a liquid mixture.
20 Activity: Layering Liquids Why were the liquids able to be layered and not mixed? Try mixing two different liquids, record your observations.
21 Lifesaver Experiment BLM #6 and 7 Observe how long the lifesaver takes to dissolve The lifesaver dissolved into the water Dissolve is when a solid crumbles into a liquid. Can you make it dissolve faster?
22 Lifesaver Experiment: Inferences Manipulated Variable- Responding Variable- amount of time it will take to dissolve a lifesaver.
23 Solutions A homogeneous mixture in which the solute is uniformly distributed throughout the solvent. Solute- The substance that is being dissolved in a solution. Solvent- the substance that does the dissolving in a solution
24 Suspension A mixture in which very small particles of a solid remain suspended without dissolving. Heterogeneous Mixture- when one substance is unevenly mixed with another.
25 Filtering Separating Solutions Pouring off the liquid Evaporation Solution to Recovery Activity
26 Crystals We can recover a dissolved substance by evaporation. We can create crystals when the liquid evaporates.
27 Surface Tension Water droplets are round and shaped like balloons The film that forms on the surface of the water is called surface tension. Surface tension is due to cohesion. An attraction of the molecules in water.
28 Surface Tension Water is very cohesive. The water molecules act like glue. Penny Challenge Paper Clip Why was the water able to bulge up? Surface tension-cohesion of water molecules.
29 Carbon Dioxide Air is composed of 78% Nitrogen, 21% oxygen and 1% other gases like carbon dioxide, water vapour, helium, etc. We breath oxygen. Carbon Dioxide is the gas we breath out. That is formed from burning fuel. Carbon dioxide is heavier than oxygen Gas in a Bag activity. BLM #12
30 Reversible and Irreversible Changes Reversible changes can go back to their original state. Irreversible changes cannot go back to their original state.
31 Chemical Reaction These are changes where two substances react chemically and they make a new substance. Testing Powders Activity BLM 13 and 15
32 Acids and Bases An acid is substance that has ph less than 7 A base is a substance that has a ph greater than 7. Neutral has a ph of 7 Both acids and bases are potentially harmful and they eat away at other substances.
33 Litmus Paper Litmus paper is used to determine if a liquid is acidic or basic Red Paper- acid stays red, base turns it blue Blue Paper- acid turns it red, base stays blue. Neutral- blue paper stays blue, red paper stays red.
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