Unit Test 1

Question 1

Accuracy

Answer 1

How closely a measured value agrees with the True(Reference) value.

Question 2

Precision

Answer 2

How closely measurements agree with each other - more DPs more precise

Question 3

How to fix Random Errors?

Answer 3

More Trials/Increase Sample Size/More Precise Device

Question 4

How to Average Values with Uncerts.

Answer 4

Avg of Measurements + Avg of Uncerts.

Question 5

Giga/Mega/Kilo/Deci/Centi/Milli/Micro/Nano

Answer 5

9/6/3/-1/-2/-3/-6/-9

Question 6

Discrete Data

Answer 6

Points can be joined - plotted as bar chart

Question 7

Continuous Data

Answer 7

Best fit line can connect data

Question 8

Coefficient R

Answer 8

+1/Perfect Positive Linear
0/No Linear Trend
-1/Perfect Negative Linear

Question 9

Error Propaagation

Answer 9

Slope Uncert.

Question 10

Tangent

Answer 10

Drawn as Large as possible to minimize uncert.

Question 11

Interpolation

Answer 11

Assume Pattern applies between points

Question 12

Extrapolation

Answer 12

Extend Trend Beyond Measurement Range

Question 13

Matter

Answer 13

Mass and Volume

Question 14

Pure Substances

Answer 14

Element or Compound - (Ionic or Molecular)

Question 15

Mixtures

Answer 15

Solutions(Steel and Brass) or Suspensions(Blood) or Mechanical

Question 16

Extensive Property

Answer 16

Depends on Amount - Mass, Volume

Question 17

Intensive Property

Answer 17

Depends of Nature - Density, Melting Point

Question 18

Distillation

Answer 18

For liquid-liquid Solutions - Based on Melting Point
Gas Distilled called Distillate

Question 19

Solvent Extraction

Answer 19

Separating Solid-Solid or Liquid-Liquid mixtures - different solubilities

Question 20

Gravity Seperation

Answer 20

Based on Density - Centrifuge

Question 21

Paper/Column Chromatography

Answer 21

Pen-Ink Colour Separation
1. Stationary Phase
2. Mobile Phase
3. Developing Solvent

Question 22

Rule for Naming Hydrates

Answer 22

Name as Normal - add (prefix) hydrate

Question 23

Rule for Naming Acids

Answer 23

Binary Acids: Hydro___ic Acid
Polyatomic Ions: ate-ic ite-ous

Question 24

Laws for Chemical Reactions

Answer 24

Law of Conservation of Mass/Energy/Electrical Charge/Atoms

Question 25

Neutralization Reaction

Answer 25

Hx + mOH -> H20 + mx

Question 26

Combustion

Answer 26

CxHyOz + O2 -> CO2 + H2O

Question 27

Carbonate Reactions

Answer 27

Hx + mCO3 -> H2O + CO2 + mx

Question 28

Activity Series Gas

Answer 28

F Cl Br I (As Listed)

Question 29

Empirical Formula (Provides Ratio) Procedure

Answer 29

1. % to grams 2. grams to moles 3. divide by smallest

Question 30

Percentage Composition Procedure

Answer 30

Molar Mass/Total Molar Mass

Question 31

Molecular Formula Procedure

Answer 31

Empirical Formula First 1. Obtain Multiplier - Molar Mass of Compound/Empirical Molar Mass

Question 32

How to obtain Density from Molarity?

Answer 32

Density = Molarity times Molar Mass

Question 33

Molarity Procedure

Answer 33

Total Moles/Total Volume (L)

Question 34

Dilution Procedure

Answer 34

m1v2 = m2v2

Question 35

Charles's Law

Answer 35

Volume is proportional to Temperature

Question 36

Gay-Lussac's Law

Answer 36

Pressure is proportional to Temperature

Question 37

Combined Gas Law

Answer 37

P1V1/T1 = P2V2/T2

Question 38

Ideal Gas Law Conditions

Answer 38

Pressure - Pa Volume - m^3 Temperature - Kelvins R - Gas Constant - 8.31 *K = C + 273.15 1 atm = 101.325kPa 1 bar = 100kPa *kPa(dm^3) = Pa(m^3)

Question 39

STP Conditions

Answer 39

Temperature - 273K - 0C Pressure - 100 kPa - 1 bar

Question 40

Ideal Gas Law vs Combined Gas Law?

Answer 40

Combined Gas Law - Changing Conditions Ideal Gas Law - Same Gas, Solving for Unknown

Question 41

Limiting/Excess Procedure

Answer 41

*Get How much excess left - use reagent side stoich Use all given with stoich to convert to specified/chosen product - least product produced is LIMITING

Question 42

Percentage Yield

Answer 42

Actual(Experiment)/Theory

Question 43

Percent Purity

Answer 43

Pure Amount/Total Amount

Question 44

Titration Setup

Answer 44

Base (Titrant) on top (In Burette with high precision - 2 dp) Acid with Indicator on bottom

Question 45

What is a Primary Standard and what to do with it?

Answer 45

Chemicals that are stable, pure, and non-hygroscopic (does not absorb water) 1. Titrate the Titrant 2. Use known Molarity for Actual Titration