9th Grade Chapter 7 Kms Flashcards Preview

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Flashcards in 9th Grade Chapter 7 Kms Deck (20)
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1

difference between a molecule and compound?

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

2

Explain what a mixture is and the 2 types

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

3

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

Color, boiling and melting point, state, luster

4

Solvent?

Does the dissolving

5

Solute?

Gets dissolved

6

Soluble/insoluble are also called

Missable and inmissable

7

Explain collide suspension

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

8

What're the 3 types of compounds/bonds

Ionic, covalent, and metallic

9

Explain ionic bond and ions

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)

10

Give an example of an ionic bond

Salt crystals made of Na+ and Cl-

11

Explain covalent bonds

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

12

Explain metallic bonds

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

13

Explain the difference between polar and nonpolar covalent bonds

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

14

Empirical formula,

Simplest ratio of atoms in a molecule
C6H12 to CH2

15

3 intermolecular forces?

Dipole dipole
London
Hydrogen

16

Explain the dipole dipole force

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

17

Explain the London force

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

18

Explain the hydrogen bond

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

19

What're the effects of the intermolecular forces

Melting point, boiling point, vapor pressure, solubility

20

The simplest expression of any atom is ?

That element