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Heat and Temperature
Matter Chemical and
Physical Changes
Atoms and
Moles
Potpourri
100 99 100 1010 100 55 100 66 100 77
200 88 200 11 200 200 22 200 1919
300 1212 300 33 300 44 300 1313 300
400 1414400 15,16,1715,16,17
400 400 1818400 20,21,22,2320,21,22,23
500 500 500 500 1111 500
100 Heat and Temperature
Convert 6.6oF to oC.Answer
Answer: 100 Heat & Temp
oC = (oF – 32) ÷ 1.8
(6.6-32) ÷ 1.8 = -14.1oC
200 Heat and Temperature
A unit of heat is:
A.calories
B. Joules
C.degrees Celcius
D.Both A and B
E.All of the above Answer
Answer 200 Heat and Temperature
D. Both calories and Joules
300 Heat and Temperature
If a 75.0 mL sample of water cools from 24.8oC to 20.0oC, how much heat was transferred from the water in SI units?
Answer
Answer: 300 Heat and Temperature
Heat = sp ht x mass x ΔT
Heat = 4.184J x 75.0g x (20.0 – 24.8oC) g oC
= -1.5 x 103 Joules
400 Heat and Temperature
A fish brought up from the deep ocean will experience a temperature change of 14oC. What is this temperature change in oF?
Answer
Answer 400 Heat and Temperature
25oF
500 Heat and Temperature
Discuss three facts about the use of the Kelvin scale and the theoretical meaning of absolute zero.
Answer
Answer: 500 Heat and Temperature
• It is mathematically useful because it has no negative numbers.
• The lowest theoretical temperature is 0K or Absolute Zero.
• At Absolute Zero, all molecular motion is believed to cease. Volume approaches zero.
• At 0K conductivity would be perfect (no heat loss)
100 Matter
What is the density of pure water at normal temperatures and pressures? (include units!)
Answer
Answer:100 Matter
density =1.00 g/mL
200 Matter
The ability of a metal to be drawn into wire is:
A.Ductility
B. Luster
C. Conductivity
D. Malleability
E.Tensile Strength
Answer
Answer:200 Matter
A. Ductility
300 Matter
Which pair of particles has approximately the same mass?
A.Protons and electrons
B.Protons and neutrons
C.Electrons and neutrons
Answer
Answer: 300 Matter
B. Protons and neutrons
400 Matter
Give the correct number for:
•The halogen group
•The period of the liquid nonmetal.
•The alkali metals group
Answer
Answer: 400 Matter
• Halogens are group 17.
• The liquid nonmetal is bromine, found in the 4th period.
• Alkali Metals are group 1.
500 MatterDiscuss the types of mixtures that can be separated by the following methods:
•Decanting
•Distillation
•Evaporation
•Filtration
•Centrifugation Answer
Answer: 500 Matter
• Decanting can separate top liquid layer in a suspension
• Distillation and evaporation can separate a liquid solution. The more volatile component evaporates/boils off first.
• Filtration can separate solid particles from liquid in a suspension.
• Centrifuging will separate components of colloids.
100 Chemical and Physical Properties
Which of the following describes Which of the following describes mass but not weight?mass but not weight?
A.Quantity of matter
B.Dependent on gravity
C.Measured with a balance
D.All of the above
E. Both A and C
Answer
Answer: 100 Chemical and Physical Properties
E. Mass is a quantity of matter.
It is measured with a balance.
It is NOT dependent on gravity.
200 Chemical and Physical Properties
Describe the four indications that a chemical reaction has occurred. Define any scientific terms.
Answer
Answer: 200 Chemical and Physical Properties
Four indications of a chemical change are:
1. Color change
2. Formation of a precipitate (an insoluble solid formed from two liquids)
3. Production of a gas (observed as fizzing, bubbling)
4. Production of heat/light
300 Chemical and Physical Properties
Which of the following is a Which of the following is a chemical change?chemical change?
A.Wax melting
B.Iron rusting
C.Eggs frying
D.All of the above.
E.Both B and C. Answer
Answer: 300 Chemical and Physical Properties
• E. Iron rusting and Eggs frying.
• Wax melting is a phase change (physical)
400 Chemical and Physical Properties
For a bar of sodium metal, give:
2 intensive physical properties
1 chemical property
2 extensive properties
Answer
Answer: 400 Chemical and Physical Properties
Answers will vary but here are some examples.
•Intensive physical: silver color, solid at room temp, melts at 98oC, density >1g/mL
•Chemical: reacts with water
•Extensive: 10.00 g, length of 3.50 cm, width of 0.55 cm
500 Chemical and Physical Properties
A chem class determined the density of a metal sample. Results are shown. Evaluate their precision. Find their accuracy. The true value for the density is 4.55 g/mL.
Class results: 4.22 g/mL ± 0.88 g/mL
Answer
Answer: 500 Chemical and Physical Properties
Precision is poor0.88/4.22 = 0.208 x 100 = 21% deviation
Meaning the results have too wide a range.
Accuracy is fair.
% error = 4.22-4.55 x 100 = 7.3%
4.55
100 Atoms and Moles
Which pair of particles are isotopes of the same element?
A. Ru and Rh
B. Ne and Ne
C. Dy and Dy
D. Sg and Rf Answer
45103
1020
1022
44103
66152
66152
106263
104259
Answer: 100 Atoms and Moles
B. Ne and Ne
Because they both have 10 protons = same element, yet they have different masses
1020
1022
200 Atoms and MolesWhich of the following pairs would be present in an element undergoing beta decay?
A. Ru and RhB. Ne and NeC. Dy and DyD. Sg and Rf
Answer
44103
45103
1020
1022
66152
66152
106263
104259
Answer: 200 Atoms and Moles
A. Ru and Rh
Because emission of a beta particle increases the number of protons
but does not change the mass.
44103
45103
300 Atoms and Moles
Given the balanced equation below, how many atoms are represented on the product side? What are the numbers after the symbol called and what do they mean?
2Fe + 3N2 + 9O2 2Fe(NO3)3
Answer
Answer: 300 Atoms and Moles
2Fe(NO3)3
Fe = 2
N = 1x3x2=6
O = 3x3x2=18
Total = 26 atoms
the small numbers are subscripts and indicate the number of only the element they come
directly after.
400 Atoms and Moles
How many atoms would be in 1.00 mole of Neon? What is special about this number?
Answer
Answer: 400 Atoms and Moles
It is Avogadro’s number
6.02 x 1023 atoms equals 1 mole.
500 Atoms and Moles
How many moles are in 8.55 x 1025 molecules of N2?
Answer
Answer: 500 Atoms and Moles
? mole = 8.55 x 1025 molecules X _______1mole__________
6.02 x 1023 molecules
Answer = 142 moles
100 Potpourri
1 cm1 cm33 is equal to: is equal to:
A.1 mL
B.1 mL3
C.1 g
D.1000 L Answer
Answer: 100 Potpourri
A. 1 mL
200 Potpourri
If 168 g of iron reacts with oxygen to form 232 g of rust, what mass of oxygen must have reacted?
Answer
Answer: 200 Potpourri
Law of Conservation of Mass
168 g of Fe + ? g of O2 232 g of Fe3O4
232-168 = 64 g of oxygen
300 Potpourri
Give the names of the 7 diatomic elements.
Answer
Answer: 300 Potpourri
HydrogenHydrogen OxygenOxygen
NitrogenNitrogen ChlorineChlorine
BromineBromine IodineIodine
FluorineFluorine
400 Potpourri
For the element iron:
A.How many protons?
B.How many electrons?
C.What is its atomic mass? (include units)
D.How many neutrons in the most abundant isotope? Answer
Answer: 400 Potpourri
A. 26 protons
B. 26 electrons
C. Atomic mass = 55.85 u
D. Most abundant isotope has a mass number of 56 thus has 30 neutrons.
500 Potpourri
Write the four phase subscripts used in a chemical equation and explain what each means.
Answer
Answer: 500 Potpourri
(g) as in HCl(g) means hydrogen chloride in the gas phase
(l) as in H2O(l) means water in the liquid phase
(s) as in Fe(s) means iron in the solid phase
(aq) as in C12H22O11(aq) means a solution of sugar dissolved in water = aqueous
