Molecules of Life Exam #1

What is a pure substance?

a substance in which there is only one type of particle

What is a mixture?

A combination of two or more substances that are not chemically combined

What is atomic structure?

protons, neutrons, electrons

What is the Octet rule?

Atoms tend to gain, lose or share electrons in order to have a full set of valance electrons.

How do you calculate atomic mass?

protons + neutrons

When reading a periodic table is the period horizontal or vertical?

vertical

When reading a periodic table are groups horizontal or vertical?

horizontal

What is an isotope?

Atoms of the same element that have different numbers of neutrons

What is Nh4?

Ammonium

What is C2H3O2?

Acetate

What is HCO3?

Bicarbonate

What is Co3^2?

Carbonate

What is Po4

Phosphate

What is NO2?

Nitrite

What is OH?

Hydroxide

What is HPO4

Phosphate

What is NO3

Nitrate

What is SO4?

Sulfate

What KCL?

Potassium Chloride

What is NaS?

Sodium Sulfate

What is Fe(OH)3

Iron Oxide Hydroxide

What is N2H4No3

Ammonium Nitrate

What is AgC2H3O2?

Silver acetate

What is giga?

a billion

What is mega?

one hundred thousand

What is kilo?

one thousand

What is deci?

1/10

What is Centi?

1/100

What is Milli?

1/1000

What is Micro?

1/100,000,000

What is Nano?

1/100,000,000,000

What does it mean when a molecule is polar?

charges are unevenly distributed

What does it mean when a molecule is non-polar?

charges are evenly distributed

What is a chemical change?

an irreversible change that changes the substance into something new

What is a physical change?

A change in which the form or appearance changes, but no new substances are formed

What is a valence shell?

outermost shell of an atom

What is an ionic bond?

A chemical bond that's formed when an atom transfers and electron to another Atom

What is a covalent bond?

sharing of electrons

What is a covalent compound?

Two or more different atoms, none of them may be the same element, that share a pair of outer electrons