Physical.

Is density a physical or chemical property?

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?

It is absorbed.

What happens to the energy in an endothermic reaction?

Mass cannot be created or destroyed

What is the Law of Conservation of Mass?

A physical system that does not interact with other systems.

What is a closed system?

Physical, solubility.

Chocolate syrup is dissolved in milk. Is it a physical or chemical property? What is the property called?

Chemical.

Fireworks explode giving off heat and light. Is this a physical or chemical change?

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.

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.

True.

True or false. When conducting an experiment, the system should be closed.

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?

False.

True or false. Combining hydrogen and oxygen to make water is a physical change.

Elephant dung, zinc and hydrochloric acid, water and calcium chloride

Name a demonstration conducted in class that resulted in an exothermic reaction.

The bonds break and the atoms rearrange.

If atoms are not created or destroyed in a reaction, how are products formed?

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?

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.

False.

True or false. During a chemical change, atoms are lost or gained to make the new substance(s).

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?

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?

False.

True or false. Weight and mass are the same thing.

flammability, reacts with acid, supports combustion, reacts with water, reacts with air

Name three chemical properties.

Chemical.

When hydrogen peroxide is poured on skin, it breaks down into water and oxygen gas. What kind of change does this demonstrate?

Draw a diagram explaining an exothermic reaction.

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?

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?