chemical reactions 3-1
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DESCRIPTIONWhat happens when you mix two substances together?
- 1. Focus Question: What happens when you combine different chemicals? Fizz QuizInvestigation3-1
2. Chemical Introduction
- What do you know about these substances?
- Citric Acid
- Baking Soda
- Calcium Chloride
- Safety First!
- Dont taste
- Wear goggle
3. What do you remember about Solutions?
- How can you make a solution?
- How do you know if a mixture is a solution?
- What does solubility refer to?
- Do you think these three chemicals will make solutions with water?
- How can you find out?
4. Make Solutions
- Groups 1, 3, 5, 7, and 9 will test Baking Soda
- Groups 2, 4, 6, and 8 will test Calcium Chloride
- Testing Procedure:
- Get one spoon of assigned chemical in cup
- Add 50 ml of water to substance and stir
5. Solution Results
- Baking soda and water make a solution
- Needed to add 25 ml of water
- Not as soluble as citric acid, kosher salt
- Calcium Chloride and water make a solution
- Property of Calcium Chloride
- as it dissolves,energyis released in the form of heat
6. Two-Chemical Solutions
- Know that citric acid, calcium chloride, and baking soda all form solutions when mixed with water.
- Do you think mixtures of these substances will form solutions when they are mixed with water?
- If you mix baking soda and calcium chloride with water, will a solution form?
7. Fizz-Quiz Place Mat
- Place Mat will help organize your investigations.
- Label 3 cups: 1, 2, and 3
- Different pair of substances in each cup
- Cup 1: Calcium Chloride and Baking Soda
- Cup 2: Calcium Chloride and Citric Acid
- Cup 3: Baking Soda and Citric Acid
- Once substances are made, set them on the corresponding circle on Fizz-Quiz place mat
8. Fizz-Quiz Observation Sheet
- Record your observation using both drawings and written descriptions of what the group observes.
- Investigate Cup 1 - draw and write what you observe - use multisensory observations
- Investigate Cup 2 - observe as above
- Investigate Cup 3 - observe as above
- Did the mixture of substances result in solutions when they were mixed with water?
- Set Cup 1 in evaporating tray for later
- Rinse and replace cups and stir sticks in bins.
- Clean up
- What do you think caused the fizzing in cups 1 and 3?
- Fizzing in a liquid is caused by gas escaping and coming to the surface.
- When calcium chloride and baking soda are mixed with water, the gasCarbon Dioxideforms.
- When citric acid and baking soda are mixed,Carbon Dioxideforms.
- Carbon Dioxideis the same gas that make the bubbles in soda water.
- What do you think the white stuff is in Cup 1?
- The white material is a new substance that formed when calcium chloride and baking soda mixed with water.
- The new substance,Calcium Carbonate(chalk), is not soluble in water.
- Settles to the bottom of the cup.
- When a solid substance forms and settles out of a liquid, it is called aPrecipitate .
- Production of gas and formation of precipitate are both Changes.
- When two or more substances are mixed together and a change occurs:
- Change is Evidence that a Chemical Reaction has taken place
- Reaction results in new substances with properties that are different from the properties of the original substances
- Starting substances calledReactants .
- New substances that form calledProducts .
- Did a chemical reaction take place in cup 1?
- How do you know?
- Cup 2?
- How do you know?
- Cup 3?
- How do you know?
- What were thereactantsin cup 1?
- What were theproductsin cup 1?
14. Carbon Dioxide
- Carbon dioxide is matter.
- Made of particles
- What do carbon dioxide gas particles look like?
- Everything in the world is made of atoms.
- Small particles of matter
- 90 different kinds of naturally occurring atoms on Earth
- Circles represent atoms
- C = Carbon
- O = Oxygen
16. Atoms and Molecules
- Carbon is a substance
- Made of Carbon atoms only
- Carbon atom is the basic particle of the substance carbon
- Oxygen is a different substance
- Made of oxygen atoms only
- Oxygen atom is the basic particle of the substance oxygen
- Atoms can combine with one another.
- When two or more atoms combine, they formMolecules .
- Basic particle of carbon dioxide is a molecule made of one carbon atom and two oxygen atoms.
- Homework: Read When Substances Change (pg 28-31) and answer questions
- Vocabulary next:
- Carbon dioxide (CO 2 )
- one of the gases in air.Carbon dioxide can be a product of a chemical reaction.
- Chemical reaction
- takes place when two or more substances are mixed together and a change occurs.
- - the process of becoming something different.
- can take a number of forms and can change from one form to another.
- Heat is one form of energy and can be released during chemical reactions and when substances dissolve.
- used by scientists to support their ideas and conclusions.
- Evidence is based on observation.
- the starting substances in a chemical reaction.
- the new substances that form in a chemical reaction.
- 6CO 2+ 6H 2 O C 6 H 12 O 6+ 6O 2
- Reactants Products
- Precipitate - a solid material that forms as a product of a reaction.
- Atoms - the smallest particles of matter.Everything is made of atoms.
- Molecules - atoms combined together.The basic particles of substances.
- What happens when a solution is made with water and two different solutes?
- Sometimes when two (or more) substances are mixed, a reaction occurs; reactants form new products.
- How do you know when a chemical reaction has occurred?
- Changes, such as heat, gas formation, and precipitate formations, are evidence of a chemical reaction.
- What are the basic particles of matter?
- Atoms are the smallest particles of matter.Atoms can combine to make molecules, which are the basic particles of most substances.
- Your questions?