Chemical and Physical 1
Chemical and Physical Changes 2
Chemical and Physical 3
Review 1
Review 2
100
How do we describe a physical change?
Same substance; reversible
100
Can you identify evidence of a chemical change?
Gas Forms
Temperature Change
Odor
Color Change
Precipitate Forms
Light Forms
100
Does a physical change produce a new substance?
A physical change does not produce a new substance
100
Remember compounds are defined as the products that result when the atoms of different substances chemically combine to form a new substance. This is a chemical change. With this in mind, define what a mixture is, explain how mixtures represent a physical change, and state how it is different from a compound.
Mixtures are two or more substance put together that can be easily separated.
Ingredients of mixtures keep their same properties but ingredients of compounds change.
Mixtures can be separated but compounds cannot.
100
What are the three ways to increase the solubility or make a solute dissolve faster in a solvent when forming a solution?
Stir, Heat, Break into smaller pieces
200
How do we describe a chemical change?
New substance; irreversible
200
Describe a heterogeneous mixture.
The parts of the mixture are identifiable because they do not blend.
200
Do new substances form when a physical change is happening?
No, the substance stays the same during a physical change.
200
Substances have specific properties (physical and chemical characteristics). What happens to these properties of different substances when they are placed together to form a mixture?
The properties remain the same.
200
To dilute is to make a solution less concentrated. You do this by using less solute or adding more solvent. With this in mind, what are the only two ways to make a solution more concentrated?
Increase the solute or Decrease the solvent
300
Is cutting a piece of paper a physical change or chemical change?
physical change
300
Is a rotten egg a chemical change?
Yes it is a chemical change.
300
Is baking cookies a physical change?
No, It is a chemical change.
300
What is a solution and what happens to the properties of solutes and solvents when they blend together to form a solution?
A solution is a mixture that includes a solute and a solvent.
The properties of the solute and solvent remain the same as they blend together.
300
List 5 methods of separating different types of mixtures and state what type of mixture each method can be used to separate.
Magnetism: Separates metals from other substances
Evaporation: Separates solutions
Filtration: Separates solids from liquids
Sifting: Separates solids from solids based on size
Floatation: Separates substances based on floating or sinking
400
Is a rotting banana physical or chemical?
It is chemical
400
Is a change in odor a sign of physical or chemical change?
Chemical change
400
Does vinegar reacting with baking soda demonstrate a physical or chemical change?
Chemical change.
400
What is a solute?
The substance that dissolves in a solution.
400
Considering the conservation of matter, how do you determine the total mass of a mixture when given the mass of the individual substances that make up the mixture?
The mass of each substances should be added to find the mass of the mixture.
500
Describe a homogeneous mixture.
A Solution because the parts of the mixture blend to look the same.
500
Does the wick burning on a lit candle demonstrate a physical or chemical change?
It is a chemical change
500
Is iron rusting a physical change or chemical change?
chemical change
500
What is a solvent?
The substance that a solute dissolves in to form a solution.
500
Debra had cups of coffee labeled A, B, C, and D with the same amount of coffee in each. She added a different amount of sugar to each cup as represented in the table.
Which cup of coffee is the least concentrated solution after the sugar dissolved?
A