More for the Final

Question 1

What is the difference between a physical and chemical change?

Answer 1

Physical is when the look of something physically is changed but its foundational composition. Like something freezing
Chemical is when somethings chemical composition is changed. Like something rusting

Question 2

The Higher units Phrase

Answer 2

Terry's 
Giant 
Mother
Killed 
Hector

Question 3

Lower unites phrase

Answer 3

Donna 
Couldn't 
Mush
Micro 
Nancy's 
Pickled 
Fries

Question 4

What are the exceptions to the octet rule?

Answer 4

1) Not enough valence electrons
2) Elements like boron who only have 3 electrons in their outer shell
3) Having a shell expansion

Question 5

what does moles of something mean?

Answer 5

The number of atoms in someting

Question 6

how do you tell if something is polar or non polar?

Answer 6

sd

Question 7

what does electronegativity mean?

Answer 7

the ability of an atom to attract shared electrons

Question 8

how does electronegativity increase?

Answer 8

From left to right because there are more protons

Question 9

How does electronegativity decrease?

Answer 9

moving from top to bottom because the cloud of the electron gets bigger shielding the pull of the protons

Question 10

What does symmetry play in polarity?

Answer 10

Asymmetrical molecules are polar because they have an uneven pull on each other.

Question 11

what does it mean for something to be polar?

Answer 11

Something having opposite ends. A positive and negative end of something. Like a battery or magnet

Question 12

What is a polar bond?

Answer 12

a covalent bond in which the electron pair is not shared equally. This creates partial charges
like a H-F OR C-H

Question 13

What is a non polar bond?

Answer 13

a covalent bond in which the electron pair is shared equally not having a more negative or more positive side
like a H-H OR C-C bond

Question 14

What is a dispersion force?

Answer 14

attraction between temporary dipoles caused by the movement of electrons in an atom or molecule they are very week

Question 15

dipole dipole forces

Answer 15

attractions between two the poles or polar molecules

Question 16

hydrogen bonds

Answer 16

the bonds is attracted only with N O F or Cl are present

Question 17

what is a pure substance?

Answer 17

Pure substances are defined as substances that are made of only one type of atom or molecule, and the purity of a substance is the measure of the extent to which a given substance is pure. The physical properties of a pure substance include well-defined melting and boiling points.

Question 18

How does polarity affect the boiling point of things?

Answer 18

the more polar something is the higher the boiling point because this means it has a stronger bond. Also something with a hydrogen bond has a high boiling point

Question 19

What is a buffer?

Answer 19

A buffer is a solution that can resist pH change upon the addition of an acidic or basic components. It is able to neutralize small amounts of added acid or base, thus maintaining the pH of the solution relatively stable.

Question 20

In a equallibrium reactions if something happens on one side what happens to the other side?

Answer 20

The reaction movies to the opposite side were change is happening to balance things out

Question 21

What is a buffer?

Answer 21

Something that resist changes to pH
A mixture of a weak acid with its conjugate base
OR a mixture of a weak base with its conjugate acidRainwater in a pure environment is slightly acidic
since ____________.

Question 22

Rainwater in a pure environment is slightly acidic

since ____________.

Answer 22

CO2 from the air dissolves in the water. CO2

is an acidic anhydride.