4.1-4.4 Quiz

Question 1

What elements are diatomic in nature?

Answer 1

7 up or BrINClHOF

Bromine
Iodine
Nitrogen
Chlorine
Hydrogen
Oxygen
Fluorine

Question 2

Typical evidence that a chemical change has occurred

Answer 2

• Production of heat or light
• Formation of a gas
• Formation of a precipitate
• Color change

Question 3

Homogeneous Mixture

Answer 3

visibly indistinguishable parts( hard to tell if things are different)

Question 4

Pure Substance

Answer 4

Substance with one constant composition

Question 5

Physical Change

Answer 5

When a substance undergoes a change in properties but not a change in composition. The atoms are not rearranged and they are usually reversible.

Question 6

A student added methanol and dry sand together and noticed that bubbles emerged from the mixture
when stirred until the mixture was completely wet. Do the bubbles produced indicate that a chemical
reaction occurred?

Answer 6

No the air trapped in the sand is producing bubbles.

Question 7

What is important when drawing a representation of aqueous solutions?

Answer 7

• sometimes only show the solute particles
• ions should be dissociated and include charge.
• Solvent (water) particles when included should be oriented with the dipoles in the correct direction
  to maximize attractions and minimize repulsions with
  solvent and solute particles.

Question 8

What are ways that mixtures can be separated?

Answer 8

Filtration, Distillation, Chromatography

Question 9

Chemical Change

Answer 9

When substances are transferred into new substances typically with different compositions.

Question 10

How do you write an overall ionic equation?

Answer 10

Break every single aqueous thing up and keep any solids together

Question 11

Common types of physical change

Answer 11

• Formation or separation of mixtures
• Phase changes

Question 12

Practice determining if something is physical or chemical change

Answer 12

• 4.1 we do
• 4.4 you do #2

Question 13

How do you know if a precipitate has formed when writing the balanced equations?

Answer 13

Either use the solubility chart or if they do not say a precipitate has formed do not assume it has

Question 14

What bonds/forces are broken during a physical change?

Answer 14

Intermolecular forces

Question 15

Element

Answer 15

substance that cannot be decomposed into
simpler substances by chemical or physical means

Question 16

What is special about HF when it comes to equations?

Answer 16

It will stay together like a solid but it is still aqueous

Question 17

Heterogeneous Mixture

Answer 17

visibly distinguishable parts(clearly different)

Question 18

Spectator ions

Answer 18

The ions which do not participate in chemical reactions and present the same on both sides of the reactions. THE PHASE NEEDS TO BE THE SAME AS WELL(AQUEOUS ON BOTH SIDES)

Question 19

How do you write a net ionic equation?

Answer 19

Only include the things that weren’t repeated on both sides(aka the two aqueous things that make the solid and the solid)

Question 20

Compound

Answer 20

a substance with constant composition that can
be broken down into elements by chemical process

Question 21

Practice writing types of chemical equations

Answer 21

• 4.2 questions
• 4.2 video 2

Question 22

What bonds/forces are broken during a chemical change?

Answer 22

Intramolecular forces/ Covalent bonds

Question 23

Practice questions in 4.4 video and 4.4 quiz

Question 24

Practice 4.4 number 3 and 4 in you do

Question 25

If every single thing in your equation is aqueous what are your spectator ions and how do you write a net ionic equation?

Answer 25

All of them would be your spectator ions and you would have no net ionic equation because no reaction would occur

Question 26

What is the “SNAP” acronym?

Answer 26

If you have
S- Sodium
N- Nitrate
A- Ammonium
P- Potassium

if any of those are in a compound then it will be aqueous and not your precipitate