Chemistry I:
The Year in Review
On the Day of the Exam, Bring all of the following:
1. A Calculator
2. A Pencil
3. Your Completed Final Exam Review Packet
4. Your Chemistry TextBook!
There are 2 formulas that you need to memorize that are not on your formula sheet:
1. Percent Error
2. Percent Yield
Make sure you know them!
Tips for ‘Math’ Problems
The hardest part is often knowing where to start and what tools to use.
Start by Reading and Identifying what TYPE of Problem it is.
Problem Types:
Is there a chemical reaction happening?
Does the question give you an amount of one substance in the reaction and ask you info about another substance?
If yes, than it is a stoichiometry question. Write a Balanced Equation and use your Stoichiometry Road Map.
Identifying Types of Math Problems:
If there is NOT a chemical reaction happening:
Does the question have mass, moles, atoms/molecules or liters of gas in it?
It is a Mole Conversion Problem
– Use your Mole Wheel!
Identifying Types of Math Problems:
If there is NOT a chemical reaction happening:
Does the question ask you to convert from one unit of a measurement type to a different unit of the same measurement type?
Use Factor-Label to convert!
Ex: How many liters does a 387cm3 liquid occupy?
Identifying Types of Math Problems:
If there is NOT a chemical reaction happening:
…..and it is NOT a mole conversion or a factor label problem…….
It is a Word Problem
Ex – What is the mass of a 35mL object with a density of 3.4 g/mL?
Steps: Make a T Chart, Data Table, and Write Formula
HonorsChemistry
Before beginning this practice,
Get Out Your:
1. Calculator
2. A piece of scratch paper
3. Your Resource Packet: includes
A. Periodic Table
B. Comp/Decomp Cheat Sheet
C. Solubility Table/Activ. Series
D. Electronegativity Sheet
4. Final Exam Formula Sheet (attached
to the back of your final review packet)
The Year in Review
Now on to the practice questions………..
Question 1
A pressure sensor senses a pressure of 2.5atm. What is that pressure if converted into kilopascals?
Hint:
You are converting from one unit of air pressure to another unit of air pressure. This is just a factor-label conversion problem – Use the relationships about Standard Air Pressure on your Formula Sheet!
Answer:
253 kPA
Show Hint
Show Answer
Question 2
What is the interval on the syringe below:
Hint:
The tenths are labeled (.3, .4, .5), but then there are ten divisions between labels. What is a tenth of a tenth?
Answer:
Hundredth of a ml
-- or –
0.01 mL
Show Hint
Show Answer
Question 3
What is the measurement of the arrow below:
Hint:
Read this carefully the scale goes from right to left. You see the 0.3 mark, what line is 0.31?
Answer:
0.307 mL
(.305, .306, .308 are also acceptable)
Show Hint
Show Answer
Atomic Structure
This is called ….?
Parts of the Atom – Know Definitions of:
Atomic Mass
Atomic Number
Mass Number
This is the …
Question 4 – Complete the chart about the atom below:
34
-2
S
Hint:
The number in the top left is the mass number. Knowing the definition of mass # helps you fill out the rest.
Mass NumberAtomic NumberProtonsNeutronsElectrons
34 16 16 18 18
Show Hint
Show Answer
Question 5
How many neutrons are in an atom of:
Chlorine - 35
Answer:
18
(Cl has 17 protons)
Hint:
When naming an isotope like this, the number given after the dash is the mass number !
(Do you know the definition of mass number?)
Show Hint
Show Answer
Question 6
How many electrons does Br-1 have?
How many electrons does Ca+2 have?
Hint:
When you GAIN an electron, you get a negative charge!
Answer:
1. Br-1 has 36 e’s
2. Ca+2 has 18 e’s
Show Hint
Show Answer
Question 7
A
B
Id each picture as:
Element
Compound
Mixture of elements
Mixture of compounds
Mixture of elements and compounds
Hint:
Elements have only one kind of atom. Compounds have at least 2 different kinds of atoms, but only 1 kind of molecule!
Answer:
Pic A is a Compound
Pic B is a Mixture of an Element & Cmpd
Show Hint
Show Answer
Question 8
Answer:
..is in your notes..
Hint:
We did this in Unit 2. Look at your notes on Chemical vs Physical Changes and Look at Chemical / Physical Changes Lab!
What are the 4 signs of a chemical change?
Show Hint
Show Answer
Question 9
Answer:
Single Replacement
Combustion
Classify the following reactions:
Cu(NO3)2 + Zn
CH4 + O2
Hint:
Use your flow chart on the back of your Unit 3 Packet if you are stuck!
Show Hint
Show Answer
Question 10
What is water acting as in the following reaction? (Acid, Base, or Neither)
HCl + H2O Cl-1 + H3O+1
Answer:
Base
Hint:
Is water accepting or donating a proton (H+) in this reaction? Then look up Bronsted definition of Acids & Bases (Unit 3).
Show Hint
Show Answer
Question 11
What happens to an element’s attraction for its valence electrons as you move:
1. From left to right on the periodic table
2. From top to bottom on the periodic table
Hint:
Look at you notes in the beginning half of your Unit 6 Packet! Make sure you know the trends in Reactivity, Size, and Attraction!
Answer:
1. The attraction increases
2. The attraction decreases moving down a column
Show Hint
Show Answer
Question 12
Draw the structural model in the correct shape for AlBr3. Then, write its shape, bond angle, and determine its polarity. Include dipole arrows and partial charges if necessary!
Will this dissolve in water?
Answer:
Trigonal Planar , 120 º, NonPolar
No. It will not dissolve in water.
Hint:
Al is an exception to the octet rule. – It spreads its 3 electrons out to make three bonds.
Solubility Rule = Likes dissolves likes. Water is Polar! – Is AlBr3 Polar or Nonpolar?
Show Hint
Show Answer
Question 13
What is the principle quantum number for Selenium’s valence electrons?
Answer:
4
Hint:
What does Principle Quantum number mean? (Unit 5)
Doing electron configuration for Selenium may help you with this question.,
Show Hint
Show Answer
Chemical Reactions
According the Law of Conservation of Mass, What mass of NaCl would be produced in the following reaction ? (don’t do stoichiometry)
Law of Conservation of Mass
FeCl3 + NaNO3 Fe(NO3)3 + NaCl
Total Mass of Reactants = Total Mass of Products
70 grams
___ grams
50 grams
40 grams
20
Show Hint
Show Answer
Question 14
Decompostion Rxn #4
Magnesium nitrite + oxygen
Mg(NO3)2 Mg(NO2)2 + O2
Classify the following reaction and write the products. Then, balance the equation:
Magnesium nitrate + heat
Hint:
Heat does not count as a substance, so this reaction only has one reactant.
Look at your Cheat Sheet
Show Hint
Show Answer
Question 15
The CRC Handbook of Chemistry and Physics lists the density of water as 0.997g/mL. What is your % error if your 3 trials of an experiment find the density to be:
Tria1 1: 1.011 g/mL
Trial 2: 0.997 g/mL
Trial 3: 0.999 g/mL
Hint:
Even though there are 3 trials, you only have one answer for % Error.
The ‘experimental answer’ is the average of your trials
Answer: 0.5%
Show Hint
Show Answer
Calculate 2.36g + 120.7g
1. 123.06 g
2. 123.0 g
3. 123.1 g
4. 123 g
Show Answer
If a sample contains 34.72g of Cu, how many atoms of copper are present?
1. 1.3 x 1027 atoms
2. 2200 atoms
3. 3.29 x 1023 atoms
4. 2.1 x 1025 atoms
Show Answer
A balloon at STP containing 1.2x1024 molecules of oxygen would have what mass?
1. 64 grams
2. 32 grams
3. 1.7 x 1024 grams
4. 3.8 x 1025 grams
Show Answer
The periodic table lists 26.982g as the atomic mass of aluminum. If you performed a lab and obtained the results below, what is your percentage error?
TrialAtomic Mass(grams)128.38228.29328.35
1. 0.05 %
2. 4.82 %
3. 5.04 %
4. 9.8%
5. 98%
Show Answer
Which represents the highest energy orbital that Arsenic (As) has electrons in?
1. 4s2
2. 5p4
3. 5p3
4. 4p5
5. 4p3
6. 3p4
Show Answer
Write the formula for magnesium hydroxide.
1. MgH2
2. MgOH
3. MgOH2
4. Mg(OH)2
5. Mg2OH
Show Answer
Show the electron dot notation for Sb
Show Answer
If 3.45g of magnesium reacts with excess cupric iodide to produce 8.3g of Cu, what is the percentage yield?
1. 8.0 %
2. 8.3 %
3. 85 %
4. 92%
5. 98 %
6. 110 %
Show Answer
Which products result when sulfuric acid is neutralized with potassium hydroxide.
1. H2O + K2SO4
2. H2OH + KSO4
3. H2O + KSO4
4. H2OH + K2SO4
Show Answer
An unknown liquid substance is found in a beaker that is homogeneous in appearance. A few days later, the beaker appears to be empty, but close inspection reveals some colorless solid at the bottom. What can be said about original liquid?
1. It was an element
2. It was a compound
3. It was a mixture
4. It could have been either a compound or an element
Show Answer
An unknown liquid substance is found in a beaker that is homogeneous in appearance. A few days later, the beaker appears to be empty, but close inspection reveals some colorless solid at the bottom. What type of separation was used here?
1. Chromatography
2. Filtration
3. Distillation
4. Crystallization
5. Electrolysis
Show Answer
Which would you predict to usually act as bases?KOH HClO3 PO4-3H2O NH4+
1. KOH only
2. HClO3 only
3. KOH and PO4-3
4. HClO3 and NH4+
5. KOH and NH4+
6. All normally act as bases
Show Answer
Which of the following represents the product of the alpha decay of Radon-224 ?
Disregard this question if alpha & beta decay equations were skipped in your semester
1. Rn - 220
2. Po - 220
3. Pb - 220
4. Ra - 225
5. Fr – 224
6. At - 224
Show Answer
150 ml of 2.5M solution of zinc chloride can be prepared by adding water to what mass of zinc chloride?
1. 0.017 g
2. 0.38 g
3. 38 g
4. 52 g
5. 63 g
6. 51,000 g
Show Answer
An atom of 14C contains how many neutrons?
1. 6
2. 8
3. 12
4. 14
Show Answer
If a 3.6g sample of Uranium-234 only contains 0.45 grams of Uranium-234 after 15 days, what is its half-life?
Disregard this question if half-life questions were skipped in your semester
1. 3 days
2. 3.8 days
3. 5 days
4. 6 days
5. 15 days
6. 20 days
Show Answer
Show the shorthand electron configuration for Iodine.
Show Answer
Which of the following will not dissolve if placed in water?
1. AgNO3
2. CaCrO4
3. PbCl2
4. K3PO4
Show Answer
Which represents the shorthand electron configuration for Silver?
1. [Kr]5s14d10
2. [Kr]5s25d9
3. [Kr]5s24d9
4. [Xe]5s24d9
5. [Xe]5s14d10
Show Answer
12.0 M HCl can be diluted to prepare 250 ml of 3.0M HCl by using what initial volume of 12.0M?
1. 0.14 mL
2. 12 mL
3. 48 mL
4. 63 mL
5. 1000 mL
Show Answer
Which combination would result in bubbling?
1. AgNO3(aq) + Cu(s)
2. H2SO4(aq) + Au(s)
3. H3PO4(aq) + Na2SO3(aq)
4. K3PO4(aq) + NaClO3(aq)
Show Answer
Which combination would result in nothing happening?
1. AgNO3(aq) + Cu(s)
2. H2SO4(aq) + Au(s)
3. H3PO4(aq) + Na2SO3(aq)
4. K3PO4(aq) + NaClO3(aq)
5. Both #1 & #3 are no reaction
6. Both #2 & #4 are no reaction
Show Answer
Which of the following has the highest ionization energy?
1. Si
2. S
3. As
4. Ga
5. I
Show Answer
The “interference” caused by inner shell electrons is called _____
1. Frequency
2. Magnetic quantum number
3. Ionization energy
4. Electron affinity
5. Shielding
Show Answer
What products result when lithium bicarbonate is heated ?
1. Li + CO2
2. Li + HCO3
3. Li2O + CO2
4. Li2CO3 + H2O + CO2
Show Answer
What is the shape of H2SiO?
1. Linear
2. Bent
3. Trigonal planar
4. Pyramidal
5. Tetrahedral
Show Answer
Which of the following would you expect to dissolve in NCl3?
1. Nonpolar Compounds
2. Polar Compounds
3. Ionic Compounds
4. There is no way to tell without testing
Show Answer
That’s It!
Good Luck on Your Final Exam !