Physical Properties
Chemical Properties
Physical Changes and Chemical Changes
The Kinetic Molecular Theory
Classification of Matter
100
What is the formula for density? Use the formula to calculate the density of a piece of aluminum with a mass of 20 g and volume of 7.4 cm3.
Formula: Density = Mass over volume Answer: 2.7g/cm3
100
What is a chemical property?
A chemical property describes the behaviour of a substance as it changes into a new substance.
100
Define what a physical change is.
A change in form or state, but not in substance.
100
What happens to particles when energy is increased?
The particles vibrate faster.
100
What is matter? According to your definition, what is not matter?
Matter is anything that has mass and volume. Sound, light, heat are not energy. Other answers will be judged.
200
What is a boiling point and what is a melting point?
A boiling point is the temperature at which a substance rapidly changes from a liquid to a gas. The change of state from gas to liquid also occurs at this temperature. A melting point is the temperature at which a substance changes from a solid to a liquid. The change of state from liquid to solid also occurs at this temperature.
200
What is the slow reaction of certain metals with oxygen forming metal oxides called?
Corrosion.
200
Identify which of the following are physical changes and which are chemical changes: a) Cooking bacon b) Folding a paper airplane c) Dissolving salt in water d) Burning cookies e) Bleaching your hair
B and C are physical changes. A, D and E are chemical changes.
200
When energy is removed from a gas, what happens to the movement of particles?
The movement of particles slows down, this will lead to a change of state, from gas to liquid.
200
Name the two subcategories of pure substances and mixtures.
Pure substances can be sorted into elements and compounds. Mixtures can be classified further as heterogeneous mixtures and homogeneous mixtures.
300
The physical properties of matter are those you can ________, _________, or _________.
Observe, measure, or calculate
300
What are three things that you use in daily life that require the chemical property flammability?
Answers may include gasoline (fuel for cars, stoves, etc), candle wicks, and firewood (for fireplaces). Other answers will be judged.
300
What is deposition? Give an example of deposition.
Deposition is the change of state from gas to solid. An example could be when it snows the water particles are skipping the liquid state. Other examples will be judged.
300
Fill in the blanks. All _______ is made up of tiny ______. ________ substances have ________ particles. ________ are in constant motion. The more _____ the particles have, the faster they move. The _________ between particles ______ with an increase in distance.
-All matter is made up of tiny particles -Different substances have different particles -The particles are in constant motion -The more energy the particles have, the faster they move. -The attraction between particles decreases with an increase in distance
300
How is an element different from a compound?
An element is a pure substance that cannot be changed into anything simpler and a compound is a pure substance that consists of two or more elements.
400
What are three examples of things that are malleable?
Answers may include gold jewelry, aluminum foil, playdoh, etc. Other answers will be judged.
400
What is oxidation? Provide an example.
Oxidation occurs when certain metals react with oxygen. An example could be leaving your bike out in the rain and it rusting. Other answers will judged.
400
Name three characteristics of physical and chemical change each.
Physical change: - usually reversible - no new substance forms - properties do not change - energy change may occur, but may not be noticed Chemical change: - usually irreversible - new substance forms - new set of properties - energy change may occur
400
When a substance is heated from a liquid to gas, why is the density different?
The density is changed because the particles are more spread apart resulting in an increase in volume but not mass.
400
Classify the following as either an element, compound, homogeneous mixture or heterogeneous mixture. a) Loonie b) Oxygen c) A pack of 24 crayons d) Perfume e) Water
a) Homogeneous mixture b) Element c) Heterogeneous mixture d) Homogeneous mixture e) Compound
500
List three physical properties of an ice cube made from water.
Possible answers: Colour --> Translucent Melting point --> 0 degrees Celsius or 32 degrees Fahrenheit State --> Solid Other answers given will be judged.
500
How are limestone caves formed?
Limestone caves are formed when weakly acidic groundwater chemically changes limestone into carbon dioxide and soluble substances.
500
While mixing chemicals together, you may see bubbles forming, what does that indicate?
It indicates that a chemical change is happening because a new substance is forming.
500
According to the Kinetic Molecular Theory, why do sugar particles dissolve faster in hot water than room temperature water?
The sugar dissolves quicker since the warmer water particles are moving more quickly, they separate the sugar particles at a higher rate as well.
500
Identify a element, compound, heterogeneous mixture and homogeneous mixture that you use in daily life.
Examples of: -Elements may include oxygen (breathing), silver (jewelry). -Compounds may include H2o (water), (CH3)2CO (nail polish remover) -Heterogeneous mixtures may include salad, chocolate chip cookies -Homogeneous mixtures may include smoothies (well blended), flat soda
M
e
n
u