General Review -- Definitions

Question 1

Molar mass

Answer 1

The mass of ONE mole of a substance

It’s the mass given of each element on the periodic table.

Question 2

Units for molar mass

Answer 2

g/mol

Question 3

Avogadro’s number units

Answer 3

            mol

Therefore one mole is 6.02 x 10^23 molecules.

Question 4

Why measure in moles?

Question 5

The law of definite proportions

Answer 5

the elements in a chemical compound are always present in the same proportion by mass

Question 6

Empirical formula

Answer 6

The lowest whole number ratio of atoms in a substance.

E.g. CH2, C2H4, and C4H8 all contain the same ratio of hydrogen compared to carbon. The simplest

Question 7

Law of conservation of mass

Answer 7

mass/matter is neither created nor destroyed in chemical reactions

Question 8

Kinetic Molecular Theory

Answer 8

1. A gar consist of an extremely large number of very tiny particles that are in constant, random motion. This is referred to as Brownian motion.
2. The gas particles occypy a relatively small volume, negligible to the volume of their container.
3. The gas molecules gave very weak attractive forces for one another because of their very large distances apart.
4. Collisions of gas particles with each other and with the walls of the container are perfectly elastic.
5. The average kinetic energy of the gas molecules is proportional to absolute temperature.

Question 9

Isoelectronic –

Answer 9

Same number of electrons–I think.
SEARCH THIS UP TO MAKE SURE AND ALSO SEARCH UP WHY THIS IS USEFUL.

Question 10

Coulombs Law

Answer 10

• Like charges repel while unlike charges attract (think protons and electrons)
• The larger the charge, the more it will either attract or repel
• The closer in distance unlike charges are to each other, the greater the force of attraction between them, while the farther they are apart, the weaker the force of attraction.
• Also, the closer like charges are, the greater the force of repulsion and vice versa.