Show:
Physical vs Chamical
Kinds of Reactions
Using Chemical Porperties
Everyday Lives
Which reaction?
100
What is a physical change? Give an example.
When a substance or object changes but what it is made of does not change. Examples will vary.
100
Explain what a chemical equation is.
A special type of sentence that shows what happens during a chemical reaction.
100
Explain how a chemical is used by a scientist when digging up fossils.
Scientists can use vinegar. The vinegar will dissolve the mineral around the fossil but will not harm the fossil.
100
Name two things in keeping healthy where chemistry is used.
Vitamins Medicine Fertilizers to grow healthy foods
100
What is the reactant and what is the product in the following chemical equation? 4P + 4O₂ --> P₄O₈
Reactant: 4P + 4O₂ Product: P₄O₈
200
What is a chemical change? Give an example.
A change that occurs and the substance or kind of matter changes into a completely different substance.
200
Explain the difference between reactants and products.
Reactants are the substances that are changing in a chemical reaction and the products are the substances being formed in a chemical reaction.
200
Explain how chemicals are used to separate metals from ores.
If you are to heat a metal to high temperatures and add carbon to it then the carbon will attract the oxygen leaving just the metal.
200
What is a polymer?
A large molecule made of many identical smaller units connected together.
200
What is the reactant and what is the product in the following chemical equation? 2HgO -> 2Hg + O₂
Reactant: 2HgO Product: 2Hg + O₂
300
What four things that are evidence of a chemical change?
Answers vary.
300
What is the Law Of Conservation of Mass?
It tells you that during a chemical reaction the total mass of the reactants are equal to the total mass of the products.
300
How can chemical properties be used to separate substances in a mixture or a compound?
Only if a substance can react with another substance.
300
Name two materials that have been created with the help of chemistry and explain how one of them is helpful.
Plastics Nylon Concrete Helpful - Answers vary
300
Which type of reaction is the following chemical reaction? Explain. 2Al₂O₃ -> 2Al + 3O₂
Decomposition Reaction because the compound that is the reactant is broken into smaller parts as the products.
400
Explain what combustion is. Is it a physical or chemical change? Explain.
The process or a substance burning. A chemical change because the substances involved are changed completely into new substances.
400
Draw a picture to show a replacement reaction.
Teacher will draw it on the board.
400
How is litmus paper used to find out if a solution is an acid or a base?
It changes color and you can use the color change to tell what it is.
400
Name and describe one way that chemicals have helped with the improvement of transportation.
Answers vary.
400
Which type of reaction is the following chemical reaction? Explain. BaCl₂ + H₂SO₄ -> BaSO₄ + 2HCl
A replacement reaction because the Ba and the H are switched from the reactant to the product.
500
Baking a cake: Chemical of physical change? Explain how you know.
Chemical, the parts you mix together are changes after you bake them.
500
How are a decomposition and a combination reaction different from one another?
Decomposition is where one or more compounds are broken down into elements. Combination is where elements are combined to create one or more compounds.
500
What color does litmus paper turn when placed in an acid? placed in a base?
acid - red base - blue
500
How was the rubber of the past changed to be improved to create the rubber we use now?
It was heated and sulfur was added to make it more durable.
500
Which type of reaction is the following chemical reaction? Explain. Then tell what the reactant is and the product is. 2Na + Br₂ -> 2NaBr
Combination reaction because there are two elements that combined to create one compound. Reactant: 2Na + Br₂ Product: 2NaBr