U1 - Module 3: Analyzing Particles

Question 1

What determines a substances identity, properties, and behavior?

Answer 1

The nature of its particles

Question 2

What do we assume to explain the different properties of substances?

Answer 2

Substances are made of particles with different compositions and structures.

Question 3

Chemical Bonds

Answer 3

Strong attractive forces that hold atoms together.

Question 4

What are pros and cons of the ball and stick model?

Answer 4

Pro: Easy to see the bonds

Con: Not correct size

Question 5

Why are the interactions different between particles in different substances?

Answer 5

Different particle composition and structure.

Question 6

Mixtures

Answer 6

Composed of 2+ types of independent particles whose presence vary in proportions in each sample.

Question 7

What are different substances made of?

Answer 7

Free atoms and bonded atoms

Question 8

What is the core assumption of modeling substances?

Answer 8

The composition and structure of the particles that make up a substance is the key differentiating characteristic.

Question 9

What do different types of particles combined lead to?

Answer 9

Different substances

Question 10

How can different components of a mixture be separated?

Answer 10

Filtration and distillation

Question 11

Elementary Substances

Answer 11

The simplest substances in nature composed of identical particles made of free/bonded atoms of the same type.

Question 12

Chemical elements

Answer 12

Elements on the periodic table

Question 13

What elements are easily atomic in nature?

Answer 13

Noble gases

Question 14

Chemical compounds

Answer 14

Substances composed of identical particles made of bonded atoms of 2+ different types.

Question 15

Molecular Compounds

Answer 15

Compounds made of nonmetals.

Question 16

Space Filling

Answer 16

Model of a compound where the particles are all fused together

Question 17

Ball and Stick

Answer 17

Model of a compound that displays the bonds between different atoms.

Question 18

Molecular Formula

Answer 18

The formula of the compound

Ex) CH2O

Question 19

Structural Formula

Answer 19

Lewis Structure

Question 20

Ionic Compounds

Answer 20

Compounds made of metals and non-metals

Question 21

Formula Unit

Answer 21

The proportion of which ions are combined in a chemical formula

Question 22

What can be a major differentiating characteristic when comparing different compounds?

Answer 22

Particle mass (not always)

Question 23

At standard conditions, what is the relationship between atoms and different elements?

Answer 23

All elements have the same number of atoms at standard conditions.

Question 24

How do scientists indirectly measure the masses and sizes of atoms/molecules?

Answer 24

Compare the masses of samples of different substances when they are the same number of particles.

Question 25

Relative Mass

Answer 25

The mass of the element located on the periodic table

Question 26

Avogadros Number

Answer 26

6.022 x 10^23

Question 27

What is avogadros number also known as?

Answer 27

1 mole

Question 28

Molar Mass is also known as...

Answer 28

Relative mass

Question 29

How do you convert from grams of a substance to moles?

Answer 29

Divide by the molar mass of the substance

Question 30

How do you convert from moles to particles?

Answer 30

Multiply by avogadros number

Question 31

How do you convert from particles to moles?

Answer 31

Divide by avogadros number

Question 32

How do you convert from moles to grams?

Answer 32

Multiply by the molar mass of the substance.

Question 33

What is the formula of density?

Answer 33

D = m (g) / V (mL)

Question 34

Atomic Species

Answer 34

One specific element

Question 35

What are the pros and cons of the space filling diagram?

Answer 35

Pros: - Accurate size - Visualizes surface features Cons: - Difficult to see bonds of atoms - Low detail for smaller molecules (hard to interpret)

Question 36

What are the pros and cons of the Ball and Stick diagram?

Answer 36

Pros: - Clear 3D representation - Easy to see bonds - Color coordinated atoms Cons: - Not correct sizing scale - Hard to create for complex molecules; cluttered