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Exam #2

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QuestionAnswer
What type of bonding does the molecule H2 possess? A. nonpolar covalent B. ionic C. polar covalent A. nonpolar covalent
What type of reaction results in loss of oxygen or addition of hydrogen? A. reduction B. halogenation C. oxidation D. dehydration E. hydration A. reduction
Positive ions are called: A. anions B. cations C. ionic compounds D. electrons B. cations
How many moles of CsBr are contained in 54.0 g of CsBr? A. 213 g B. 3.94 moles C. 0.254 mole D. 0.600 mole E. 54.0 moles (Cs 132.9 + Br 79.90 = 212.80 <- total atomic #), 54.0g x 1 mole/212.80g = 54.0/212.80 = 0.254 mole
Speeds up a chemical reaction by lowering the activation energy? A. reactants B. catalyst C. rate of reaction D. products B. catalyst
Which of the following is the correct name for Au3+? A. iron(III) ion B. silver ion C. gold(III) ion D. gold E. gold ion C. gold(III) ion
The strongest type of intermolecular attractive forces or interactions between polar molecules of NF3 are: A. hydrogen bonds B. ionic bonds C. dispersion forces D. dipole-dipole E. ion-dipole D. dipole-dipole
A reaction that absorbs 65.3 kcal of energy can be classified as.....Ca(OH)2 + 65.3 --> CaO + H2O A. oxidation B. reduction C. endothermic D. exothermic E. equilibrium C. endothermic
A gas occupying a volume of 60.0 mL has a 273K. What is the new volume if the absolute temperature if the gas decreases by a factor of two while the pressure and amount remain constant? A. 2.50 atm B. 137K C. 120 mL D. 30.0 mL E. 0.625 atm D. 30.0 mL
Which of the following represents the oxidation half for the reaction of elements barium and sulfur in the formation of barium sulfide? Ba + S ---> BaS A. Ba ----> Ba2+ + 2e- B. S + 2 e- ---> S2- A. Ba ---> Ba2+ + 2e-
Which is the correct electron arrangement and symbol for a magnesium ion? A. Mn7+ : 2e- 8e- 8e- B. Mg2+: 2e- 8e- C. Mn2+: 2e- 8- 8- D. Mg: 2e- 8e- 2e- E. Mg2+: 2e- 8e- 8e- B. Mg2+: 2e- 8e-
Nitrogen and hydrogen combine according to the following reaction: N2 + 3 H2 ---> <--- 2 NH3 (1st arrow on top of second) What effect does the removal of nitrogen have on the equilibrium? A. Shift right product favored B. Shift left reactant favored B. Shift towards reverse reaction to remove stress (Shifts left, reactants favored)
The correct name for SO2 is: A. Sulfur dioxide B. sulfate ion C. sulfur oxide D. sulfite ion A. Sulfur dioxide
A substance in which state of matter, generally has stronger attractive forces between molecules? A solid B. gas C. liquid A. solid
The volume of a gas will decrease by a factor of two if the number of the gas particles decreases by a factor of two, while temp and pressure are held constant, according to which gas law? Avogadro's Law
Nitrogen and oxygen combine according to the following reaction: N2 + 2 O2 ---> <--- 2NO2 What effect does the addition of oxygen have on the equilibrium? A. Forward to remove stress B. Reverse to remove stress A Shift towards forward reaction to remove stress (Shift right, products favored)
Atoms of an element in a compound lose, gain, or share valence electrons in order to produce a stable, noble gas arrangement of electrons. This statement refers to the: A. electronegativity B. mass conservation C.electron conservation D. octet rule D. Octet rule
According to Boyle's Law, how are the pressure and volume of a gas related if amount and temperature remain constant? A. there is no relationship B. inversely related C. directly related B. inversely related
An inhalation anesthetic is mixed with oxygen. The partial pressure of oxygen is 520 mmHg and the anesthetic is 240 mmHg. What is the total pressure of the mixture? Dalton's Law (T = P1 + P2) - 520 + 240 = 760 mmHg
The pressure of a gas at 27*C was measured to be 2.0 atm. At what temperature would this gas have a pressure of 4.0 atm if the volume and amount remained constant? A. 54*C B. 14*C C. 600K D. 150K C. 600K 27*C + 273 = 300, 2.0/300K = 4.0/600K
Which is the correct electron arrangement for an atom of boron? A. 2e- 2e- 1e- B. 2e- 3e- C. 2e- 2e- D. 2e- 8e- E. 2e- 2. 2e- 3e-
The amount of a gas dissolved in a liquid will decrease as the vapor pressure decreases according to: A. Charles' Law B. Henry's Law C. Gay-Lussac's Law D. Boyle's E. Avogadro's Law F. Dalton's Law B. Henry's Law
Which gas law equation can be used to calculate the new pressure if pressure, volume, temperature all change when only the amount of gas remains constant? A. Ideal Gas Law B. Combined Gas Law C. Boyle's Law D. Gay-Lussac's Law E. Dalton's Law B. Combined Gas Law
How many electrons does the element calcium gain/lose to form a calcium ion? A. gain 1 B. lose 1 C. gain 2 D. lose 2 E. gain 6 D. lose 2
Change in matter when a new substance is formed? A. chemical property B. physical change C. chemical change D. physical property C. chemical change
Element, Ionic Compound or Covalent Compound? P2S5 Covalent compound (metal to metal)
Element, Ionic Compound or Covalent Compound? NCl3 Covalent compound (metal to metal)
Element, Ionic Compound or Covalent Compound? PtF3 Ionic compound (metal to gas)
Element, Ionic Compound or Covalent Compound? ZnS Ionic compound (metal to gas)
Element, Ionic Compound or Covalent Compound? KClO2 Ionic compound (metal to gas)
element, Ionic Compound or Covalent Compound? I2 Element
IUPAC or chemical formula: Ba(ClO2)2 Barium Chlorite
IUPAC or chemical formula: PbCO3 Lead(II)Carbonate
IUPAC or chemical formula: Zn(NO3)2 Zinc Nitrate
IUPAC or chemical formula: Fe(OH)3 Iron(III) Hydroxide
IUPAC or chemical formula: PI3 Phosphorus triiodide
IUPAC or chemical formula: vanadium(V) oxide V2O5
IUPAC or chemical formula: lithium sulfide Li2S
IUPAC or chemical formula: ditellurium decabromide Te2Br10
IUPAC or chemical formula: silver phosphate Ag3PO4
IUPAC or chemical formula: sodium hydrogen carbonate NaHCO3
How many grams of AgNO2 in 2.5 mols of AgNO2? Ag = 107.9 + N = 14.01 + O x 2 = 16.00 total of 159.775 grams x 2.5 mols = 380g
Created by: daydreamer67
 

 



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