Terms for General Chemistry test chap 3 and 4

Key terms to know

Metal

The classification of elements that is most homogeneous and contains the most conductive elements are the …

Nucleus

The … contains 99.999% mass of an atom

Noble gas

Group 18 are the … and are mostly unreactive.

Work

This is force times distance

heat

Thermal energy or … always moves from hotter areas to colder

Volatile

A chemical that is easily gasified is called …

endothermic

A(n) … process is when heat enters a system and it feels cold

calorie

The energy required to raise one gram of water one degree Celsius is called …

Distillation

Separation by boiling

Kinetic energy

The ability to do work via motion

Ion

A(n) … is an atom or molecule that has gaining or lost electrons

Semi-conductors

Metalloids make good … because electricity passes through them but not easily.

gas

A state of matter with both a undefined volume and undefined shape but uncharged

Amorphous

A solid that lacks structure at the molecular level and coal is an example

Compound

A pure substance that is a fixed ratio of two or more elements is called a(n)

Chemical

Combustibility is a … property of a given substance

Physical properties

The abilities of matter to undergo different kinds of physical changes.

Homogeneous

A mixture that does appear as a pure substance is classified as a … Mixture

Atom

A(n) … is the fundamental component of all matter in which cannot be broken down by chemical means.

Atomic Number

… represents the exact number of protons in the nucleus of a type of element

Celsius

Which is larger? Celsius or Fahrenheit?

Chemical change

… Is a transformation of matter in which the chemical properties are different.

Filtration

Separation by size

neutron

The subatomic particle that differs in two isotopes.