Classification of Elements and Periodicity Questions and Answers
Inorganic Chemistry
Classification of Elements and PeriodicityHydrogen peroxide is used as a cleaning agent in the treatment of cuts and abrasions for several reasons. It is an oxidizing agent that can directly kill many microorganisms; it decomposes upon contact with blood, releasing elemental oxygen gas (which inhibits the growth of anaerobic microorganisms); and it foams upon contact with blood, which provides a cleansing action. In the laboratory, small quantities of hydrogen peroxide can be prepared by the reaction of an acid on an alkaline earth metal peroxide, such as barium peroxide.
BaO2 (s) + HCl(aq) → H₂O₂ (aq) + BaCl₂ (aq)
What amount of hydrogen peroxide should result when 1.18 g of barium peroxide is treated with 26.7 ml of hydrochloric acid solution containing 0.0283 g of HCI per mL?
Inorganic Chemistry
Classification of Elements and PeriodicityIf a gas at 0.832 atm pressure in a volume of 0.565 L is compressed to 0.195 L, what is the new pressure according to the ideal gas law?
0.287 atm
2.41 atm
3.48 atm
0.415 atm
Inorganic Chemistry
Classification of Elements and PeriodicityIn a gas thermometer (constant pressure conditions) the gas has a volume of 1.00 L at 85.0 °C. The thermometer is placed in a freezer. The final volume measured is 0.29 L. What is the temperature of the freezer?
100 K
25 K
1.2×10³ K
3.4×10-³ K
Inorganic Chemistry
Classification of Elements and PeriodicityThe modern periodic table has the elements arranged in order of increasing
A. density.
B. atomic size .
C. atomic weight.
D. atomic number.
E. charge.
Inorganic Chemistry
Classification of Elements and PeriodicityWhat would you multiply "moles of strontium" by to get the units "grams of strontium"?
Inorganic Chemistry
Classification of Elements and PeriodicityMany metals occur naturally as sulfide compounds; examples include ZnS and CoS. Air pollution often accompanies the processing of these ores, because toxic sulfur dioxide is released as the ore is converted from the sulfide to the oxide by roasting (smelting). For example, consider the unbalanced equation for the roasting reaction for zinc:
ZnS (s) + O₂(g) → ZnO(s) + SO2(g)
How many kilograms of sulfur dioxide are produced when 240 kg of ZnS is roasted in excess oxygen by this process?
Inorganic Chemistry
Classification of Elements and PeriodicityFor the following reaction, 5.21 grams of magnesium nitride are mixed with excess water. The reaction yields 7.00 grams of magnesium hydroxide.
magnesium nitride (s) + water (I) → magnesium hydroxide (aq) + ammonia (aq)
What is the theoretical yield of magnesium hydroxide?
What is the percent yield of magnesium hydroxide?
Inorganic Chemistry
Classification of Elements and PeriodicityClassify each of the compounds as soluble or not soluble:
magnesium sulfate
aluminum hydroxide
calcium carbonate
Inorganic Chemistry
Classification of Elements and PeriodicityOn the basis of the element's location in the periodic table, indicate what simple ion each of the following elements is most likely to form.
Cl
a. Formula of ion:
Ra
b. Formula of ion:
Ca
c. Formula of ion:
Inorganic Chemistry
Classification of Elements and PeriodicityHow many of the following postulates of Dalton's atomic theory are still scientifically accepted?
I. All atoms of the same element are identical.
II. Compounds are combinations of different atoms.
III. A chemical reaction changes the way atoms are grouped together.
IV. Atoms are indestructible.
1
0
4
3
2
Inorganic Chemistry
Classification of Elements and PeriodicityThe element rubidium forms a ____ with the charge ____
The symbol for this ion is ___
The number of electrons in this ion is and the name is ___
Inorganic Chemistry
Classification of Elements and PeriodicityConsider the following reaction:
CH₂(g) +40₂(g) →CCl₂(g) + 4HCl (g)
What mass of CCl4 will be formed if 1.20 moles of methane react with 1.07 moles of chlorine?
41.1 g
658 g
185 g
165 g
19.0 g
Inorganic Chemistry
Classification of Elements and PeriodicityNaturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23% abundance), X-29 (28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10% abundance). What is the identity of element X?
Al
Sr
Cu
Ni
Si
Inorganic Chemistry
Classification of Elements and Periodicitye. Choose an example of a synthesis reaction that is also an oxidation-reduction reaction, but that does not involve combustion.
2KNO3(s) → 2KNO2 (s) + O2(g)
2Fe(s) + 3Cl2 (g) → 2FeCl3 (s)
2AgNO3 (s) → 2Ag(s) + 2NO2(g) + O₂(g)
CH4 (g) +202 (g) → CO2 (g) + 2H₂O(l)
NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(1)
C(s) + O₂(g) → CO2 (g)
Inorganic Chemistry
Classification of Elements and PeriodicityChoose the characteristic physical properties that distinguish the metallic elements from the nonmetallic elements.
(Select all that apply.)
rigid and fragile
bad conductors of electricity
bad conductors of heat
excellent conductors of electricity
generally shiny (lustrous) when a fresh surface is exposed
excellent conductors of heat
malleable and ductile
generally transparent when polished
Inorganic Chemistry
Classification of Elements and PeriodicityHow many protons and neutrons are contained in the nucleus of the isotopes below? Assuming the atoms are uncharged, how many electrons are present?
22Ti48
protons
neutrons
electrons
56fe26
protons
neutrons
electrons
Inorganic Chemistry
Classification of Elements and Periodicitya. Give the correct definition of a combustion reaction.
A combustion reaction is typically a reaction in which an element or compound reacts with so quickly and with such a large release of energy that a flame results.
b. In addition to the chemical products, what other products do combustion reactions produce?
electrons
atoms
heat energy
protons
c. Write the chemical equation for a combustion reaction of C₂H6.
(Use the lowest possible coefficients. Omit states of matter.)
Inorganic Chemistry
Classification of Elements and PeriodicityA compound containing only sulfur and phosphorus is 50.9% S by mass; the molar mass is 252 g/mol. What are the empirical and molecular formulas of the compound?
Empirical formula:
Molecular formula:
Inorganic Chemistry
Classification of Elements and PeriodicityComplete the balanced equation for the reaction that produces the given salt.
(Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
a. __ + __ -> __ Rb2SO4 (aq) + __H2O (l)
a. __ + __ -> __CsNO3 (aq) + __H2O (l)
a. __ + __ -> __ RbCl (aq) + __H2O (l)
Inorganic Chemistry
Classification of Elements and PeriodicityA compound is found to contain 34.60 % chlorine, 46.85 % oxygen, and 18.55 % fluorine by mass.
The empirical formula for this compound is
The molar mass for this compound is 102.5 g/mol.
The molecular formula for this compound is
Inorganic Chemistry
Classification of Elements and PeriodicityAn element consists of 0.19% of an isotope with mass 135.907 u, 0.25% of an isotope with mass 137.9060 u, 88.45% of an isotope with mass 139.9054 u, and 11.11% of an isotope with mass 141.9092 u. Calculate the average atomic mass, and identify the element.
Inorganic Chemistry
Classification of Elements and PeriodicityWrite the net ionic equation for the following molecular equation.
Ag₂SO4(aq) + (NH4)2CO3(aq) → Ag₂CO3(s) + (NH4)2SO4(aq)
Inorganic Chemistry
Classification of Elements and PeriodicityCalculate (Show all work for credit. Answer should be in significant figures)
a. How many meters in 1.00 mile?
b. How many centimeters are in 2.00 ft?
Inorganic Chemistry
Classification of Elements and PeriodicityWhich BEST explains how syllogisms should be used to prove logic?
Select one:
arrange statements that avoid using emotional logic
arrange arguments that avoid using ethos or pathos
arrange premises so only one true conclusion is possible
arrange fallacies so only one true conclusion is possible
Inorganic Chemistry
Classification of Elements and PeriodicitySelect the net ionic equation for the following reaction:
NaCl(aq) + AgNO3(aq) -> NaNO3(aq) + AgCl(s)
Ag (aq) + Cl(aq) -> AgCl(s)
Ag(s) + Cl(g) -> AgCl(s)
Ag (aq) + NO3(aq) + Nat(aq) + Cl(aq) -> AgCl(s) + Na*(aq) + NO3(aq)
AgNO3(aq) + CH(aq) -> AgCl(s) + NO3(aq)
NaCl(aq) + Ag*(aq) -> AgCl(s)
Inorganic Chemistry
Classification of Elements and PeriodicityThe aspirin substitute, acetaminophen (C8H₂O₂N), is produced by the following three-step synthesis:
i. C6H5O3N(s) + 3H₂(g) + HCl(aq) → CeHs ONCI(s) + 2H₂O(l)
ii. C, H, ONCI(s) + NaOH(aq) → C6H7 ON (s) + H₂O(l) + NaCl(aq)
iii. C&H7 ON (s) + C₂H6O3(1)→ Cg H₂O₂N(s) + HC₂H30₂ (l)
The first two reactions have percent yields of 86% and 94% by mass, respectively. The overall reaction yields 13 moles of acetaminophen product for every 17 moles of C6H5O3N reacted.
a. What is the percent yield by mass for the overall process?
b. What is the percent yield by mass of Step III?
Inorganic Chemistry
Classification of Elements and PeriodicityWhich of the following compounds is a non-electrolyte?
A.acetic acid, CH3CO₂H
B.iron(II) chloride FeCl2
C.potassium iodide, Kl
D.sodium bicarbonate, NaHCO3
E.iodine
Inorganic Chemistry
Classification of Elements and PeriodicityThe term brinkmanship refers to:
a. willingness to interfere with the national bank.
b. willingness to go to the edge, or brink, of war.
c. willingness to make peace with another country.
d. None of the above.
Inorganic Chemistry
Classification of Elements and PeriodicityBromine exists naturally as a mixture of bromine-79 and bromine-81 isotopes. An atom of bromine-79
contains:
34 protons and 35 electrons, only.
79 protons, 79 electrons, and 35 neutrons.
35 protons, 79 neutrons, and 35 electrons.
44 protons, 44 electrons, and 35 neutrons.
35 protons, 44 neutrons, 35 electrons.
Inorganic Chemistry
Classification of Elements and PeriodicityA compound is found to contain 39.99 % carbon, 6.727 % hydrogen, and 53.28 % oxygen by mass What is the empirical formula for this compound?
Inorganic Chemistry
Classification of Elements and PeriodicityWhich of the following compounds is incorrectly named?
CaO is calcium oxide
MgSO3 is magnesium sulfite
Mg(OH)₂ is magnesium dihydroxide
NH4NO3 is ammonium nitrate
K3PO4 is potassium phosphate
Inorganic Chemistry
Classification of Elements and PeriodicityFor the following reaction, 23.5 grams of iron are allowed to react with 5.58 grams of oxygen gas
iron(s) + oxygen(g) → iron(II) oxide(s)
A)What is the maximum mass of iron(II) oxide that can be formed?
B)What is the FORMULA for the limiting reagent?
C)What mass of the excess reagent remains after the reaction is complete?
Inorganic Chemistry
Classification of Elements and PeriodicityThe following reactions:
Pb2+ + 21-→ Pbl2
2Ce4+ +21₂ + 2Ce³+
HAC + NH3 → NH4 + OẠC
are examples of
A)acid-base reactions.
B)precipitation, acid-base, and redox reactions, respectively.
C)redox, acid-base, and precipitation
reactions, respectively.
D)unbalanced reactions.
E)precipitation, redox, and reactions, respectively.
Inorganic Chemistry
Classification of Elements and PeriodicityWhich of the following are transuranium elements?
Choose all that apply.
At
Cf
Bh
Ba
V
Inorganic Chemistry
Classification of Elements and PeriodicityPaper clips are made of iron. If the average paper clip weighs 2 grams, how much does
a mole of iron weigh? How many paper clips would be needed for a mole of iron?
Inorganic Chemistry
Classification of Elements and PeriodicityWhich of the following electron configurations is correct?
Br: [Kr]4s²3d¹⁰4p⁷
Ca: [Ar]4s¹3d¹⁰
Mo: [Kr]5s²4d⁵
Ga: [Kr]4s²3d¹⁰4p¹
Br: [Xe]6s² 4f¹⁴5d¹⁰6p³
Inorganic Chemistry
Classification of Elements and PeriodicityThe moral that the story teaches us is
a) Do not wear new clothing to parties
b) Do not lie to others; you will be found out
c) Do not aspire for more than you have; it will ruin you
d) Do not wear expensive jewelry to parties
Inorganic Chemistry
Classification of Elements and Periodicity1. The element aluminum forms a_______ with the charge________ .
2. The symbol for this ion is _______ and the name is _________ ion.
3. The number of electrons in this ion is _______.
Inorganic Chemistry
Classification of Elements and PeriodicityDr. Raisa and her team of geologists have been studying GPS data that shows that two plates moved apart. Which diagram shows what happened between the two plates as they moved away from each other?
(a) Diagram A: A new plate from underneath filled in the gap that was created by the plates moving apart.
(b) Diagram B: Sand and dirt filled in the gap that was created by the plates moving apart.
(c) Diagram C: Ocean water filled in the gap that was created by the plates moving apart.
(d) Diagram D: Soft, solid rock from underneath the plates rose and hardened, adding solid rock to the edges
both plates.
Inorganic Chemistry
Classification of Elements and PeriodicityWhat is the valence electron configuration for the beryllium atom?
What is the valence electron configuration for the nitrogen atom?
Inorganic Chemistry
Classification of Elements and PeriodicityWhat is the name of the element with a valence electron configuration of 4s²4p³?
What is the name of the element with a valence electron configuration of 3s²3p⁴?
Inorganic Chemistry
Classification of Elements and PeriodicityConsider the following four cases
i. A chemical process in which heat is absorbed.
ii. A change in which q = 30 J, w = 44 J.
iii A process in which a system does work on its surroundings with no change in q.
iv. A process in which work is done on a system and an equal amount of heat is withdrawn.
In how many of these cases does the internal energy of the system decrease?
0
1
2
3
4
Inorganic Chemistry
Classification of Elements and PeriodicityWhat is Heisenberg's uncertainty principle?
Electrons travel in discrete orbitals around the nucleus.
It is impossible to know the exact position and speed of an electron at a given time.
It is impossible to predict the spin of a moving electron.
Electrons are negatively charged and nuclei are positively charged.
Inorganic Chemistry
Classification of Elements and PeriodicityAt a certain temperature, 0.4211 mol of N, and 1.541 mol of H, are placed in a 5.00 L container.
N₂(g) + 3H₂ ⥨ 2NH3(g)
At equilibrium, 0.1401 mol of N, is present. Calculate the equilibrium constant, Kc.
Inorganic Chemistry
Classification of Elements and PeriodicityWhich of the following correctly describes a sigma bond?
a double bond
a triple bond
a bond formed when the nodes of two orbitals overlap
a bond formed when two orbitals overlap end to end
Inorganic Chemistry
Classification of Elements and PeriodicityXeFn+ mH2→ A(Contain Xe) + Other Products
Regarding above reaction, which of the following option is correct :
When n = 6 and m = 2, the hybridisation of Xe in A is sp^3d^2.
When n = 2 and m = 1, then other products has a diatomic colored gas.
When n = 6 and m = 3, then Electron pair structure of A is tetrahedral.
When n = 6 and m = 1, the hybridisation of Xe in A is sp^3d.
Inorganic Chemistry
Classification of Elements and PeriodicityA chemist mixes 22.6 g of ethanol with 7.47 g of acetone and 89.1 g of 1-bromobutane. Calculate the percent by mass of each component of this solution. Round each of your answers to 3 significant digits.
Inorganic Chemistry
Classification of Elements and PeriodicityIt is not considered safe to put a whipped cream container into a fire because the pressure will increase and cause an explosion. If a whipped cream container at 0.0 C is put into a campfire and its temperature is raised to 500. C, what was the initial pressure in the container if the final pressure is 29 atmospheres?
Inorganic Chemistry
Classification of Elements and PeriodicityWhich of the following describes the element F?
(A) belongs to a group consisting entirely of gases
(B) is one of the group of the least reactive elements
(C) forms a basic solution in water
(D) is very reactive as a metal
(E) consists of diatomic molecules in elemental form
(F) reacts vigorously with alkali metals to form salts
Inorganic Chemistry
Classification of Elements and PeriodicityWhich of the following describes the element Ba.
a. forms a basic solution in water
b. consists of diatomic molecules in elemental form
c. is one of the group of the least reactive elements
d. is found in nature only combined with other elements
e. is very reactive as a metal
f. reacts vigorously with alkali metals to form salts