Show:
Lesson 1: Chemical Changes
Lesson 2: Kinds of Chemical Reactions
Lesson 3: Chemical Properties
Lesson 4: Chemical Technology
Short Answer
100
What is a chemical change?
What is a change that occurs when one substance or kind of matter changes into another completely different kind of matter with different properties?
100
In a chemical equation,what is the substance used in a reaction?
What is a reactant?
100
Name two ways that you can identify a property?
What is the flame test, density, or using and indicator strip?
100
Who was the British scientist that discovered penicillin?
Who is Alexander Fleming?
100
Fossils can be found in limestone. Explain how scientists can use a chemical reaction to separate a fossil from limestone without damaging the fossil?
What is scientists can use vinegar to eat away the limestone. The vinegar reacts chemically with the limestone and dissolves the limestone away from the fossil. The fossil remains undamaged because the vinegar does not react with the fossil?
200
What type of change occurs when the material keeps its identity?
What is a physical change?
200
In a chemical equation, what is the substance made called?
What is a product?
200
In using an indicator strip, what color might an acid turn to?
What is orange or red?
200
What is a large molecule made of many identical smaller units connected together?
What is a polymer?
200
Explain how treated rubber, which is heated and has sulfur added, has different properties from untreated rubber? Why is treated rubber more desirable?
What is treated rubber does not dry and crack during cold weather or melt during warm weather? Treated rubber is more desirable because it can be used in all climates year-round for things like automobile tires.
300
What type of chemical process occurs when a log is burning in a fireplace?
What is combustion?
300
What is a special type of sentence in chemistry?
What is chemical equation?
300
How you can clean a fossil without damaging it?
What is by cleaning it with vinegar?
300
How can you be safe while using chemical products?
What is read the directions first?
300
What are two materials that are a result of chemical technology?
What is concrete made with cement? Cement is a human-made material. Another material made from chemical technology is plastic or nylon.
400
What is an example of a chemical change?
What is a car rusting, an antacid tablet in water, or a log burning.
400
Finish the statement, Matter is neither _______, nor _______.
What is created and destroyed?
400
Can chemical properties be used to separate elements from solutions?
Yes
400
If the chemical has a X on it, what does that mean?
It means that it is Harmful or Irritating.
400
What are the properties the materials have that make them useful for human lives?
What are vitamin-enriched foods. Chemists can add vitamins that the body needs to be healthy. These foods cure or prevent diseases that are caused by a lack of vitamins.
500
What is the scientific name for rust?
What is iron oxide?
500
What are three types of chemical reactions?
What is decomposition, combination, and replacement?
500
What type of rock can be dissolved with vinegar?
What is limestone?
500
What is applied to rubber to help make it more durable?
What is heat and sulfur?
500
Explain how rust forms?
What is iron is exposed to air and moisture? Oxygen atoms in the air or water react with the iron atoms, forming iron oxide.