1 / 40

SUBSTANCE

SUBSTANCE. SUBSTANCE. MATTER. MIXTURE. SUBSTANCE. COMPOUND. HETEROGENEOUS. ELEMENT. HOMOGENEOUS. Characteristics of matter that can be measured and observed without changing the makeup of the substance. Ability of a substance to undergo or resist a chemical change.

rooney-carpenter
Télécharger la présentation

SUBSTANCE

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SUBSTANCE SUBSTANCE

  2. MATTER MIXTURE SUBSTANCE COMPOUND HETEROGENEOUS ELEMENT HOMOGENEOUS

  3. Characteristics of matter that can be measured and observed without changing the makeup of the substance. Ability of a substance to undergo or resist a chemical change. A change in which the appearance of matter changes but its properties and makeup remain the same. A change that produces one or more kinds of matter that are different from those present before the change. A law that states that mass cannot be created or destroyed.

  4. PHYSICAL AND CHEMICAL CHANGES

  5. Physical and Chemical Changes A.Physical change- the form or appearance of matter changes, but composition stays the same.  1.Shape can change, but substance does not.  2. Dissolving a solid into a liquid is a physical change.  3. Changing states through vaporization, condensation,   sublimation, or deposition does not change the   composition of the matter.

  6. B. Chemical change results in a change in the substance’s composition.  1. Color can change as a chemical reaction occurs.  2. Energy may be gained or release during a chemical   change.  3. Odor can change when a chemical change occurs.  4. A gas forming can indicate a chemical change. 5. A precipitate (a solid from a liquid) can indicate a chemical change.  5. Chemical changes are not easily reversed.

  7. C. Chemical changes alter the composition of the substance, 
physical changes do not alter the composition of substances. 1. Water freezes or evaporates-amount of matter  stays the same (physical change)  2. Wood burns-ashes, smoke, and gases still total   the same amount of matter (chemical change) D. Law of Conservation of Mass- particles of matter are not 
created or destroyed as the result of physical or chemical 
changes.

  8. Physical changes include: Wadding up a piece of paper. Chopping a piece of wood in half with an ax. Tearing a piece of cloth. Cutting a hamburger with a knife. Biting into an apple. Flattening a lump of clay with your fist. Hitting a baseball with a bat. Sitting on a balloon and popping it.

  9. Chemical changes include: Digesting your dinner. Removing grease with soap. Cooking an egg in a hot pan. Milk that has gone sour. Lighting the wood you chopped in half with an ax. Making cookie batter and baking it. Exercising and using sugars and fats stored in your body.

  10. Chemical vs. Physical Changes In a physical change, the substances are 
not altered chemically, but merely changed 
to another phase (i.e. gas, liquid, solid) or 
separated or combined. In a chemical change, the substances are 
altered chemically and display different 
physical and chemical properties after the 
change.

  11. Chemical Changes…. Are changes that cause a NEW material to form. The original material cannot easily be recovered. There is a chemical reaction. SIGNS OF A CHEMICAL REACTION: Unexpected color change Bubbling or fizzing (which means a gas is forming) Light Smoke Temperature change A precipitate may form when two liquids are mixed An odor may occur

  12. Physical Changes….. Do not change the identity of the substance or material. May cause the substance to look different after the change. Examples: Breaking something into pieces Changes of state (melting, boiling, condensing, sublimating) Dissolving one substance in another Heating without burning You can usually get the original material back through easy 
methods such as with separation or distillation.

  13. Read the article on physical and chemical changes, complete the questions. Complete the worksheet on P-C changes. Read, understand, highlight lab 
sheet for tomorrow. STUDY FOR NEXT Tuesday'S TEST! article is also online pgs 73 - 76

  14. when pulled

  15. D C A B Identify 1 - 5 and A-D. Tell what the plateaus mean.

  16. D C A B A. Freezing B. Melting C.Condensation D. Evaporation 1. Solid 2. Solid to liquid 3. Liquid 4. LIquid to Gas 5. Gas

  17. Physical - Chemical Change Lab Students will complete six different 
experiments and make observations for 
each experiment. Read the procedure carefully, and make 
sure you know what to do before you begin 
each experiment. Watch carefully, and 
make careful observations. Data table needs to be filled out completely, 
and questions answered.

  18. 1. This is a demonstration. Pay attention and fill out the table. 2. Place a 50ml beaker on your balance and find its mass. Add 
0.5 g to that mass by moving the slider. Add colored Powder A to your beaker until it balances again. Add 30ml of water and 
stir. 3. Carefully, pass a piece of COPPERover a lit burner until a change is observed. Hold the copper with forceps. You will not need your burner after this experiment, so carefully put the 
flame out and cap it. 4. Put 20 drops of HCl (hydrochloric acid) into a small test tube. 
Add a pinch of zinc metal. Observe changes during and after to 
the zinc. 5. Put copper sulfate solution into a small test tube until it is 
half full. Add a small piece of fine steel wool, and let it sit for 3 
minutes. Check carefully for a temperature change by touching 
the outside of the tube. Tap out the solid onto a paper towel and 
observe it for changes. 6. Put 20 drops of solution A into a small test tube. Add 20 
drops of solution B. Observe changes after 5 minutes. 7. Put 10 drops of solution C into a small test tube. Add 10 
drops of solution D. Observe changes for 1 minute.

  19. What are the signs of a chemical change? Chemical change results in a change in the substance’s composition.  1. Color can change as a chemical reaction occurs.  2. Energy may be gained or release during a chemical   change.  3. Odor can change when a chemical change occurs.  4. A gas or a precipitate can indicate a chemical change.  5. Chemical changes are not easily reversed.

  20. QUESTIONS: List three physical properties of many solids. 
______________ _____________ _____________ 2. Name a physical property of liquids. __________________________ 3. What are some “signals” that a chemical change is 
occurring? 4. What kind of change is happening when ice melts? 
_________________________ 5. When a candle is burning, name both a physical 
change and a chemical change.

  21. EXPERIMENT 2

  22. EXPERIMENT 3

  23. EXPERIMENT 4

  24. EXPERIMENT 5 2

  25. EXPERIMENT 6

  26. EXPERIMENT 7

  27. Physical and Chem Changes Video.docx Matter_and_Its_Properties__Changes_in_Matter.asf

  28. _____1) physical change _____2) boiling point _____3) homogeneous mixture _____4) malleable _____5) adhesion _____6) brittle _____7) viscosity _____8) tensile strength _____9) water _____10)melting point _____11)heterogeneous mixture _____12)density _____13)chemical change _____14) cohesion

  29. _____1) physical change _____2) boiling point _____3) homogeneous mixture _____4) malleable _____5) adhesion _____6) brittle _____7) viscosity _____8) tensile strength _____9) water _____10)melting point _____11)heterogeneous mixture _____12)density _____13)chemical change _____14) cohesion

  30. Attachments Physical and Chem Changes Video.docx Matter_and_Its_Properties__Changes_in_Matter.asf

More Related