9th Grade Chapter 7 Kms

Question 1

difference between a molecule and compound?

Answer 1

A molecule is 2 or more atoms joined together

A compound is 2 or more elements joined together to make a new substance

Question 2

Explain what a mixture is and the 2 types

Answer 2

A mixture (not pure) is 2 or more compounds mixed together but not chemically combine (salt and sand can be mixed but separated once you add water)

1. Homogeneous- evenly mixed, same physical property throughout
2. Heterogeneous- unevenly mixed

Question 3

How to tell if it’s a mixture, what can you use to seperate?

Answer 3

Color, boiling and melting point, state, luster

Question 4

Solvent?

Answer 4

Does the dissolving

Question 5

Solute?

Answer 5

Gets dissolved

Question 6

Soluble/insoluble are also called

Answer 6

Missable and inmissable

Question 7

Explain collide suspension

Answer 7

It’s when somehing is insoluble but particles are suspended by brownish motion (in between state before dissolving)

Question 8

What’re the 3 types of compounds/bonds

Answer 8

Ionic, covalent, and metallic

Question 9

Explain ionic bond and ions

Answer 9

Electrical attraction between positive and negative atoms (ion) and no sharing of electrons
Fairly weak
When an atom is charged Na to Na+ (losing or gaining an electron causing an atom to have a charge)

Question 10

Give an example of an ionic bond

Answer 10

Salt crystals made of Na+ and Cl-

Question 11

Explain covalent bonds

Answer 11

Electrical attraction between atoms due to the sharing of 2 or more electrons
Strong bond (10 times stronger than ionic)
Not good conductors
H H < between each H and the O is 2 electrons
o being shard

Question 12

Explain metallic bonds

Answer 12

Like covalent bonds but shared electrons can travel anywhere they’d like (electron sea/delocalized)
Good conductors of heat/electricity

Question 13

Explain the difference between polar and nonpolar covalent bonds

Answer 13

Polar- electrical bonds (positive and negative ends)

Non polar- electrical symmetry (no positive/negative ends)

Question 14

Empirical formula,

Answer 14

Simplest ratio of atoms in a molecule

C6H12 to CH2

Question 15

3 intermolecular forces?

Answer 15

Dipole dipole
London
Hydrogen

Question 16

Explain the dipole dipole force

Answer 16

Between 2 polar molecules, relatively strong
H H o
O. H H

Question 17

Explain the London force

Answer 17

Instantaneous dipole
Stop time and both electrons theatre being shared might for a split second be in the middle causing the balance to be off and causing a partial positive side
Very weak

Question 18

Explain the hydrogen bond

Answer 18

Only when hydrogen bonds to oxygen, fluorine, nitrogen
VERY strong
Exposed hydrogen proton (bc there’s only 1) and has atoms attracted to it’s positiveness

Question 19

What’re the effects of the intermolecular forces

Answer 19

Melting point, boiling point, vapor pressure, solubility

Question 20

The simplest expression of any atom is ?

Answer 20

That element