Chem Ch 3 pt 1

What are the properties of a gas?

A gas has no fixed volume or shape.

What is the difference between a homogeneous -mixture and a heterogeneous mixture?

A heterogeneous mixture has two or more distinct regions that have different compositions. A homogeneous mixture has only one region and the composition of the mixture does not change.

What are the properties of a liquid?

A liquid has a fixed volume, but will assume the shape of the container it fills. Liquids are not compressible.

What is a mixture?

A mixture is composed of two or more pure substances that have been mixed together in a variable proportion.

What is the difference between a mixture and a compound?

A mixture is formed when two or more pure substances are mixed together, but a new substance is not formed. A compound is formed when two or more elements are bonded together in a fixed ratio to form a new substance.

What is the definition of a physical property? What is the definition of a chemical property?

A property of a substance that can be determined or observed without changing the chemical composition of a compound is called a physical property. A property in which the chemical composition of a substance is altered is called a chemical property.

What is a pure substance?

A pure substance is composed of only one type of atom or one type of molecule.

What are the properties of a solid?

A solid has a fixed volume and a definite shape, and is not compressible.

What is an element? A compound?

Element cannot be broken down into two or more simpler substances. Compound is made up of two or more elements in a fixed ratio and can be broken down into simpler substances.

Which state has never recorded a temperature above 100° F?

Hawaii

Which temperature scale avoids negative temperatures?

Kelvin

Define matter.

Matter is defined as anything that occupies space and has mass.

Elements

Nickle, carbon, gold

The symbol ∆ in the equation used to calculate heat represents ______.

a change in

The statement "matter is neither created nor destroyed in a chemical reaction" is best classified as ______.

a law

A chemical change is ______.

a reactant becoming a product

An amorphous solid is the result of ______.

atoms or molecules that do not have long range, well-ordered, geometric arrangement

Compounds

baking soda (sodium bicarbonate)

Which of the following is a physical property of a substance?

boiling point

In a chemical cold pack, two substances are kept separate by a divider. When the divider is broken, the substances mix and absorb heat from the surroundings. The chemical cold pack feels cold. Is the reaction exothermic or endothermic?

endothermic

Which word best describes reactions that release heat?

exothermic

Which energy unit is most likely to appear on an electricity bill?

kWh

What are the three states of matter?

solid,liquid,gas

Which of the following is an example of a compound?

water