Physical vs Chemical changes

Which of the following changes is a physical change?

• Evaporation of water

• Melting water

• Burning a piece of paper

• Both choices A and B are examples of physical changes

Which of the following descriptors of a liquid is a chemical property?

• The liquid is red

• The volume of the liquid is 1 liter

• The liquid is flammable

• The density of the liquid is 2 g/L

Which of the following sentences defines the law of conservation of mass?

• Energy can not be created or destroyed, only transformed from one form to another.

• Mass can not be created or destroyed, only transformed from one form to another.

• Charge cannot be created or destroyed, only transformed from one form to another.

• Mass can be created and destroyed

How does the law o conservation of mass apply to chemical changes?

• The law of conservation of mass does not apply to chemical changes.

• The amount of mass in the reactant is less than the amount of mass in the product

• The amount of mass in the reactant is more than the amount of mass in the product

• The amount of mass in the reactant is equal to the amount of mass in the product

How can you differentiate between chemical and physical properties?

• A chemical property requires a formation of a new substances while a physical property does not

• A physical property requires a formation of a new substances while a chemical property requires a new substance

• Both a physical property and a chemical property require a new substances.

• Neither a physical property nor chemical property require the formation of a new product

Which of the following is not a form of energy?

• Potential energy

• chemical energy

• friction

• kinetic energy

When you eat a banana and go or a run, how is energy transferred?

• The chemical energy in the banana is transferred to kinetic energy to run.

• The potential energy in the banana is transferred to kinetic energy to run.

• The kinetic energy in the banana is transferred to chemical energy to run

• The mechanical energy in the banana is transferred to chemical energy to run

Which of the following substances is an element?

• Gold

• Brass

• Steel

• Brick

How are atoms of the same element similar?

• Atoms o the same element have the same number of protons

• atoms of the same element have the same number of neutrons

• Atoms of the same element have the same number of electrons

Which of the following substances is a heterogeneous mixture?

• Pizza with toppings

• Kool-Aid

• Brass

• Sterling silver