Chemistry Final Review

A pure substance is a matter that consists of matter with a composition that

• is fixed in a definite proportion at all times.

• depends on the temperature

• varies according to the amount of water present

• always contains two or more substances

Compounds are pure substances that by definition consist of

• a single element

• oxygen and hydrogen

• two or more elements in combination

• solids

What is a physical property?

• can be observed or measured without changing the composition of matter

• characteristic of a substance that may be observed when it participates in a chemical reaction

• flammability, toxicity, chemical stability, and heat of combustion

• a chemical reaction

What is a chemical property?

• characteristic of a substance that may be observed when it participates in a chemical reaction

• can be observed or measured without changing the composition of matter

• States of matter include liquid, solid, and gaseous states.

• odor, boiling point, ability to conduct heat, ability to conduct electricity, ability to dissolve in other substances

A mixture that does not have same composition throughout the mixture.

• Heterogenous

• Homogenous

• Elements

• Compounds

Convert 100 degrees C into Kelvin

• 373 K

• 273 K

• 212 K

• 0 K

Convert 450 K to Celsius

• 723 degrees C

• 277 degrees C

• 177 degrees C

• 623 degrees C

Isotopes are atoms of the same element that have the same number of __________ but different number of __________ . Therefore, isotopes of the same element have different masses

• protons, neutrons

• protons, electrons

• neutrons, protons

• electrons, protons

The mass of an atom is located in the ___________ and the volume of an atom is made of the ____________

• electron cloud, nucleus

• electron cloud, energy levels

• nucleus, electron cloud

• nucleus, neutrons

Which subatomic particle has a negative charge in the atom?

• Proton

• Neutron

• Electron

• Quark