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Chemical and Physical Properties Chemical and Physical Changes Evidence of a Chemical Reaction Law of Conservation of Mass Potpourri
100
Physical.
Is density a physical or chemical property?
100
In a chemical change, a new substance is formed. A chemical change causes a change in the chemical and physical properties.
How is a chemical change different from a physical one?
100
It is absorbed.
What happens to the energy in an endothermic reaction?
100
Mass cannot be created or destroyed
What is the Law of Conservation of Mass?
100
A physical system that does not interact with other systems.
What is a closed system?
200
Physical, solubility.
Chocolate syrup is dissolved in milk. Is it a physical or chemical property? What is the property called?
200
Chemical.
Fireworks explode giving off heat and light. Is this a physical or chemical change?
200
Change in color, odor, formation of a gas, formation of a new substance, temperature
Name a piece of evidence that would indicate a chemical reaction has occurred.
200
True.
True or false. In a reaction, the number of atoms on the reactant side of the equation will always equal the number of atoms on the product side.
200
True.
True or false. When conducting an experiment, the system should be closed.
300
A physical property is observed with senses and determined without destroying matter. A chemical property indicates how a substance reacts with something else.
What is the difference between a physical and chemical property?
300
False.
True or false. Combining hydrogen and oxygen to make water is a physical change.
300
Elephant dung, zinc and hydrochloric acid, water and calcium chloride
Name a demonstration conducted in class that resulted in an exothermic reaction.
300
The bonds break and the atoms rearrange.
If atoms are not created or destroyed in a reaction, how are products formed?
300
10.
The chemical equation for the combustion of propane is: C3H8 +5O2 -> 3CO2 + 4H2O. How many oxygen atoms are included in the reactant side on the equation?
400
A. Iron corrodes in moist air.
Which of the following is a chemical property of iron?
A. Iron corrodes in moist air
B. Density = 7.874 g/cm3
C. Iron is soft when pure.
D. Iron melts at 1808 K.
400
False.
True or false. During a chemical change, atoms are lost or gained to make the new substance(s).
400
Producing an odor, creating a new substance, change in color
An egg is cracked into a hot frying pan. Is a chemical reaction occurring? If yes, how do you know?
400
62 grams.
A student weighs a flask containing 100 mL of water and finds that it weighs 49 grams. The student then adds 13 grams of baking soda to the flask. How much should the flask weigh now?
400
False.
True or false. Weight and mass are the same thing.
500
flammability, reacts with acid, supports combustion, reacts with water, reacts with air
Name three chemical properties.
500
Chemical.
When hydrogen peroxide is poured on skin, it breaks down into water and oxygen gas. What kind of change does this demonstrate?
500
Draw a diagram explaining an exothermic reaction.
500
16 grams.
In a reaction, 27 grams of reactant AB breaks down into 11 grams of product A and an unknown amount of product B. Using the conservation of mass, how much does product B weigh?
500
The presence of an odor that was not there previously is evidence of a chemical reaction.
What is the difference between odor as a physical property and as evidence of a chemical reaction?






Chemical Interactions

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