Atoms, Molecules & Ions

Question 1

Avogardo Theory

Answer 1

Equal volume of different gases under the same conditions contain the same number of particles

Question 2

Law of multiple Proportions

Answer 2

If two or more elements form a compound then the first & second elements weights will be in a ratio of small whole numbers

Question 3

Molecualr weight

Answer 3

molar mass of a covalent compound

Question 4

Electrostatic Forces

Answer 4

Forces that cause repulsion between similarly charged atoms

Question 5

Atomic Number

Answer 5

Represents the number of protons & electrons per atom (It above the element)

Question 6

James Chadwick

Answer 6

Found a neutron & that its mass is 1.68E^-24

Question 7

Compounds

Answer 7

Pure substances that can be decomposed into or more different pure substances

Question 8

Millihan

Answer 8

Oil Drop experiment where it determined the charge on an electron ( 1.60E¹⁰ C) ( Also found the mass of an electron 9.11E^-28)

Question 9

Atomic Mass

Answer 9

Measured in atomic mass units (amu) & also equal to the number of protons + neutrons

Question 10

Molar mass

Answer 10

Mass in grams of one mole of an atom (g/mol)

Question 11

Formula

Answer 11

Is the shorthanded way of expressing the relative number & types of atoms in a given compound (C₁₂H₂₂O₁₁ there are 12Carbons, 22 Hydrogens, & 11 Oxygens )

Question 12

Law of definite Proportions

Answer 12

Atoms ratio is fixed so the mass of atom sare constant

Question 13

Ionic Compounds

Answer 13

Consists of ions ( Cations or Anions) and transfer electrons

Question 14

J.J Thomson

Answer 14

Invested the cathode ray tube where it proved the existence of the electron ( Also found the charge: Mass ratio of an electron)

Question 15

Formula weight

Answer 15

Molar mass of a ionic compound

Question 16

Rutherford

Answer 16

Gold foil experiment where he found the nucleus of a atom (Also found that the majority of an atom is empty space)

Question 17

What are Daltons 3 modified Postulates

Answer 17

1. Elements are made of atoms, and that the atoms of a given element have the same properties
2. Atoms of different elements have different properties
3. Compounds are formed when two or more elements combined

Question 18

Structural Formula

Answer 18

Formulas that shows what atoms are bonded to (CH₃CH₂OH)

Question 19

Law of conservation of mass

Answer 19

Atoms are neither created nor destroyed

Question 20

Molecular formula

Answer 20

Gives the compostion of the molecule (May be the same as the empirical formula)

Question 21

Periodic Law

Answer 21

The properties of elements are a function of their atomic number

Question 22

Isotopes

Answer 22

Atoms with the same atomic number but different atomic mass

Question 23

Empirical Formula

Answer 23

Simplest formula when it gives the simplest atom ratio(Mole ratio)

Question 24

Dmitri Mendelev

Answer 24

Invented the period table where its catorized in groups & periods

Question 25

Covalent Copounds

Answer 25

Molecules that share electrons