Period 3 Final Review Game
Question #1: Calculating H Calculate the value of
H for the Net reaction:
TiO2 (s) + CCl4 (g) + 2 Mg (s) → Ti (s) + CO2 (g) + 2 MgCl2 (g) From the following enthalpy changes TiCl4 (l) + CO2 (g) → TiO2 (s) + CCl4 (g) TiCl4 (l) + 2 Mg (s) → Ti (s) + 2 MgCl2 (s)
H = + 155kJ H = - 478kJ
Answer #1 A.
TiCl4 (l) + CO2 (g) → TiO2 (s) + CCl4 (g)
B.
TiCl4 (l) + 2 Mg (s) → Ti (s) + 2 MgCl2 (s)
Reverse the reactants and products in A to make
H = + 155kJ H = - 478kJ H = - 155kJ
TiO2 (s) + CCl4 (g) → TiCl4 (l) + CO2 (g) Rewrite B TiCl4 (l) + 2 Mg (s) → Ti (s) + 2 MgCl2 (s)
Cancel out identical values on opposite sides of equation and then add. TiO2 (s) + CCl4 (g) + 2 Mg (s) → Ti (s) + CO2 (g) + 2 MgCl2 (g)
5) What is the Chemical name for the compound: NaCl A. Sodium Chlorine B. Sodium Chloride C. Salt D. Sodium Chlorate
5) Name the compound: NaCl Answer. B. Sodium Chloride
Most of the volume of an atom is taken up by the electron cloud. True or False?
False, the nucleus does
Answer #1 Continued Check if your new equation matches with Net reaction. Net: TiO2 (s) + CCl4 (g) + 2 Mg (s) → Ti (s) + CO2 (g) + 2 MgCl2 (g) New: TiO2 (s) + CCl4 (g) + 2 Mg (s) → Ti (s) + CO2 (g) + 2 MgCl2 (g) The only change made was switching
H = + 155kJ to - 155kJ
Add. (- 155kJ) + (- 478kJ) H = - 633kJ
Question #2: Enthalpy Changes How much heat is required to raise the temperature 412 ml of water from 32.0°C to 45.0°C? Use the Equation: Q=mc T Hints: Density of water: 1.00g/ml Specific Heat of Water as a Liquid: 4.184 J/g°C
Q = Heat (J) m = Mass (kg or g) c = Specific Heat (J/g°C) T = Change in Temperature (°C)
Answer #2 Q=mc T Q=(412 g)(45°C - 32°C)(4.184 J/g° C) Q=(412 g)(13°C)(4.184 J/g°C)
Q = Missing value m = 412 ml → 412 g c = 4.184 J/g°C T = 45°C - 32°C
Q=(5356 g°C)(4.184 J/g°C) Q=(22409.504g°CJ/g°C) Q=22409.50J
3SF
Q=22400J
Question #3: Energy Diagram Identify the parts of the diagram. (A - F)
Reactants → Products
D.
B.
F.
C.
E. A.
Answer #3
A. B. C. D. E. F.
Reactants Potential Energy Activation Energy PE of Activated Complex Activation Energy of Reverse PE of Products Heat of Inverse Reaction
Reactants → Products
D.
B.
F.
C. E. A.
Question #4: Calculating Keq N2(g) + 3H2(g)
2NH3(g)
Given: Concentrations at equilibrium N2 = [.921] H2 = [.763] NH3 = [.157]
a.
Write the general expression.
b.
Write the numerical expression.
c.
Keq = _______
d.
How does that relate to 1? ______
e.
What do you mainly have at equilibrium? _______
Answer #4 N2(g) + 3H2(g)
2NH3(g)
Given: Concentrations at equilibrium N2 = [.921] H2 = [.763] NH3 = [.157]
a.
c.
Write the general expression. [NH3]^2 [N2][H2]^3 Write the numerical expression. [.157]^2 [.921][.763]^3 Keq = .0602
d.
How does that relate to 1? Keq < 1
e.
What do you mainly have at
b.
equilibrium? Mainly Reactants
Question #5: Predicting Equilibrium Predict the direction in the shift in the equilibrium position of this reaction when: a. b. c. d. e. f. g.
As4O6 (s) + 6C (s) + heat
As4 (g) + 6CO (g)
Is this reaction exothermic or endothermic? ____________ CO is added: Shift _____ Heat increased: Shift _____ As4 is removed: Shift _____ Pressure is increased: Shift _____ Heat is decreased: Shift _____ CO is removed: Shift _____
Answer #5 a. Is this reaction exothermic or endothermic? Endothermic b. CO is added: Shift left c. Heat increased: Shift right d. As4 is removed: Shift right e. Pressure is increased: Shift left f. Heat is decreased: Shift left g. CO is removed: Shift right
How many particles are there in 1 mole of anything?
6.022 x 10
23
4) Which is the COMPLETE chemical symbol for element with 53 protons, 74 neutrons, and 54 electrons? A. -153I127 B.
127 -1 I 53
C.
53 -1 I 127
4) Which is the COMPLETE chemical symbol for element with 53 protons, 74 neutrons, and 54 electrons? A. -153I127 B.
127 -1 I 53
C.
53 -1 I 127
Answer. B. 12753I-1
The Periodic Table 1. Which element of the following has the biggest atomic radius? A. Hydrogen B. Lithium C. Magnesium D. Barium Answer: D. Barium. Atomic radius increases as you go down a group and decreases as you go across a row
The Periodic Table 2. True or False? Sodium is more electronegative than oxygen Answer: False. Oxygen has more electronegativity than Sodium
What is Avogadro’s number?
6.022 x 10
23
The periodic Table 3. Which row is the farthest to the right of the Periodic Table? Answer: 18/VIIIA or The Noble gases
The Periodic Table 4. Which of the following elements has the smallest and greatest ionization energy? A. Calcium B. Iron Answer: C. Chlorine. C. Chlorine Ionization Energy goes up as you go D. Sodium across a row
The Periodic Table 5. What Block do the Lanthanides and actinides belong to? Answer: The F Block
3) What is the Percent Composition of Carbon in Carbon Dioxide? A. B. C. D.
33% 50% 28% 30%
3) What is the Percent Composition of Carbon in Carbon Dioxide? A. B. C. D.
33% 50% 28% 30%
Answer.
C. 28%
1) How do atoms absorb and emit radiation?
If electrons gain enough energy or lose enough they may jump to different energy orbits.
How many atoms are in 4.00 grams of sulfur?
.125 atoms
2) What is the difference between fusion and fission?
Fission: certain nuclei having a large mass combined with special particles that cause the nuclei to split into two smaller nuclei Fusion: Nuclei of light elements are combined to form heavier nuclei
3) What anode rays and what are three properties?
Anode ray: stream of positively charged particles shoot from the anode of a discharged tube when a current is passed through a gas. Properties: Travel in straight lines, produce mechanical effects, and positively charged as deflect towards negative plate in electric field.
4) Emission of an alpha particle leads to what?
It decreases by two units in the charge of the atom.
5) The velocity of alpha rays is what?
It is 1/10 of the velocity of light. The velocity of light is 671 million mph (6.71 x 108).
How many moles are in 222 grams of copper?
3.49 moles
2) Which Compounds below are ionic? (There can be more than one answer) A. N2 B. CaF2 C. NO2 D. CuSO4 E. CCl4
2) Which Compounds below are ionic? (There can be more than one answer) A. N2 B. CaF2 C. NO2 D. CuSO4 E. CCl4
Answer.
B. CaF2 D. CuSO4 E. CCl4
Fill in the blank and Classify. 1)
235
U → ____ + A. Alpha B. Beta C. Gamma 92
231 90
TH
Fill in the blank and classify. 1) 235 231 92
U→
____ +
A. Alpha B. Beta C. Gamma Answer. 4 2
He; A. Alpha
90
TH
Sodium hydroxide is a strong base. This means that __________?
Answer NaOH dissociates completely to Na+(aq) and OH-(aq) when it dissolves in water
How many valence electrons does Helium have?
How many valence electrons does Helium have? Although it is the noble gas family, Helium only has two valence electrons because of it’s small size
Which family would an Alkali Metal most likely bond with?
Which family would an Alkali Metal most likely bond with? An Alkali metal would most likely bond with a Halogen, family 7, because an Alkali metal wants to get rid of one electron while a Halogen wants to gain 1
Question 5 Convert 450 degrees F into Kelvin.
Question 5 Convert 450 degrees F into Kelvin. Answer: 505.372
What is the molarity if 25.0 grams of H2SO4 are dissolved in 100.0 ml of water?
Answer 2.55 M H2SO4
Which family is the least reactive?
Which family is the least reactive? Noble gases, family 8, are the least reactive. This is because a noble gas already has a full outer shell, and does not want to gain or lose any electrons
How many bonds can Phosphorous form?
How many bonds can Phosphorous form? Phosphorous can form 3 bonds, because it already has 5 valence electrons, meaning it wants to gain 3 more electrons to fill its shell
True or false? Bohr’s model of the atom explained the spectra of the Hydrogen atom
True Borh’s model was based on the following assumptions: -The electron in a Hydrogen atom travels around the nucleus in a circular orbit -The energy of the electron in an orbit is proportional to its distance from the nucleus. The further the electron is from the nucleus, the more energy it has. ●
●
●
●
Only a limited number of orbits with certain energies are allowed. In other words, the orbits are quantized. The only orbits that are allowed are those for which the angular momentum of the electron is an integral multiple of Planck's constant divided by 2p. Light is absorbed when an electron jumps to a higher energy orbit and emitted when an electron falls into a lower energy orbit. The energy of the light emitted or absorbed is exactly equal to the difference between the energies of the orbits.
Question 1 Which of the following is an ionic bond? A. NO B. H2O C. MgCl2 D. F2
Answer 1 C. MgCl2 is the answer because Magnesium Chloride Magnesium and chlorine form an ionic bond. Covalent bonds are formed when two or more atoms share electrons between them. Ionic bonds are when atoms gain or lose electrons to become charged species (ions) that share an electrostatic interaction called an ionic bond. Magnesium forms a positive ion (cation) with a 2+ charge and chlorine forms a negative ion (anion) with a 1- charge. So two chlorine anions form an ionic bond with one magnesium cation for form MgCl2, a neutral chemical compound. Metals and non-metals often form ionic bonds because of the difference in their electronegativity values. Electronegativity is basically a measure of how strongly an element will attract electrons toward it. Chlorine (a non-metal) has an electronegativity value of 3.0 and magnesium (a metal) has an electronegativity value of 1.3. This makes a difference of 3.0 - 1.3 = 1.7. In general, any electronegativity difference of 1.6 or more is considered an ionic bond, and MgCl2 falls into this category
You need a mix of .750L of Acetic acid solution with a final concentration of 1.25M from a 17.5 M acetic acid, how much volume of 17.5M acetic acid must you use?
Answer .054L Acetic Acid
Question 4 A water solution that is 15.0% sucrose by mass has a density of 1.059 g/mL. What mass of sucrose, in grams, is contained in 3.05 L of this solution?
Question 4 A water solution that is 15.0% sucrose by mass has a density of 1.059 g/mL. What mass of sucrose, in grams, is contained in 3.05 L of this solution? Answer: 484 g sucrose
Question 2 What type of bonding does NaCl have? A. Metallic B. Polar Covalent C. Ionic D. Nonpolar Covalent
Answer 2 C. Ionic bonding, the sodium chloride molecule forms by the ionization of sodium and chloride atoms and the attraction of the resulting ions. An atom of sodium has one 3s electron outside a closed shell, and it takes only 5.14 electron volts of energy to remove the electron
Question 3 A nuclear reaction where the nucleus of an atom splits into smaller parts is known as? A. Nuclear fusion B. Binary fusion C. Nuclear fission D. Binary fission
Answer 3 C. Nuclear fission. Nuclear fission either happens naturally or can be caused to happen by bombarding a fissionable isotope with neutrons. Nuclear fission happens when an atom splits into two atoms and releases energy.There are several naturally occurring isotopes which will split spontaneously and release energy, such
Question 4 The number of moles of solute present in 1 kg of a solvent is called its? A.molality B.molarity C.normality D.formality
Answer 4 A. molality. molality is the number of solute divided by the number of solvent. In that case, the moles of solutes are scaled to produce the molality as converted from the input data. The shift is linear in the molality.
Question 5 The most electronegative element among the following is? A.Sodium B.Bromine C.Fluorine D.Oxygen
Answer 5 C. Fluorine The electronegativity values tend to increase as you go to the right and up the periodic table. The reverse statement is that the values tend to decrease going down and to the left.
Question 3 A little aluminum boat has a mass of 14.50 grams and a volume of 450.00 cm3. The boat is placed in a small pool of water and carefully filled with pennies. If each penny has a mass of 2.50 g, how many pennies can be added to the boat before it sinks?
Question 3 A little aluminum boat has a mass of 14.50 grams and a volume of 450.00 cm3. The boat is placed in a small pool of water and carefully filled with pennies. If each penny has a mass of 2.50 g, how many pennies can be added to the boat before it sinks? Answer: 173 pennies
What are the four states of matter in order of distance between particles?
Solid, liquid, gas, plasma
Consider the following equilibrium: H2O + H2O <------> (H3O+) + OHWhen a solution of Sr (OH)2 is added the equilibrium shifts ?
Answer left and (H3O+) decreases
Is ice in water a mixture or a compound?
Ice in water is a homogeneous mixture because they are both the same substance but there are many molecules.
What are all of the metal's characteristics?
a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g., iron, gold, silver, copper, and aluminum, and alloys such as brass and steel).
Question 2 How many sig figs are in the answer to: 2.345 + .00096 + 20000.0 - .013 + 6.987 - .1
Question 2 How many sig figs are in the answer to: 2.345 + .00096 + 20000.0 - .013 + 6.987 - .1 Answer: 6
How do metal chemical bonds relate to its electrical conductivity?
Their bonds allow free passage of electrons (electricity) through the substance.
I mix dihydrogen monoxide and sodium chloride what will be the new substance?
Water and salt do not mix chemically but the salt would become ionized from this process.
The equivalence point in a titration is reached when 20.0 mL of H2SO4 is added to 20.0 mL of 0.420 M KOH. The (H2SO4) in the original solution is ?
Answer 0.210
Question 1 If a star travels at a speed of 3.0 x 108 m/sec how far does the star travel in one week?
Question 1 If a star travels at a speed of 2.0 x 106 m/sec how far does the star travel in one week? Answer: 12.o96 x 1011