Test 3
what is the electron configuration for Ga?
1s22s22p63s23p64s23d104p1
What is the theoretical yield of waffles if you have 5 cups of flour, 9 eggs and 3 tbs of oil? (2 cups flour + 3 eggs + 1 tbs oil --> 4 waffles) a. 10 b. 12 c. 6 d. 4 e. not enough information
a. 10
Consider the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) --> PbI2(s) + 2KNO3(aq) a. PbI2 b. KNO3 c. Pb(NO3)2 d. KI
a. PbI2
Which of the following statements is false? a. the excess reactant is completely consumed in a chemical reaction b. the theoretical yield is the amount of product that can be made based on the amount of limiting reaction c. The actual yield is the amount of product actually produced by a chemical reaction d. the percent yield = (actual yield/theoretical yield) x 100% e. all of the above statements are true
a. the excess reactant is completely consumed in a chemical reaction
Which of the following types of electromagnetic radiation has a higher energy per photon than visible radiation? a. microwave b. ultraviolet c. radio d. infrared
b. ultraviolet
How many core electrons are in a bromine atom? a. 35 b. 18 c. 28 d. 7
c. 28
What type of reaction is the generic equation A + BC --> AC + B? a. synthesis/combination b. decomposition c. single displacement d. double-displacement
c. single displacement
Which statement below does not follow the Bohr Model? a. when energy is absorbed by atoms, the electrons are promoted to higher-energy orbits b. when an atom emits light, electrons fall from a higher orbit into a lower orbit c. the energy emitted from a relaxing electron can have any wavelength d. electrons exist in specific, fixed orbits
c. the energy emitted from a relaxing electron can have any wavelength
Consider the following generic chemical equation: 2A + 5B --> C + 3D If you react 4 units of A with 10 units of B, which statement is true? a. Substance A will be the limiting reactant b. Substance B will be the limiting reactant c. there is just enough of A and B so that everything reacts completely d. substance C cannot be formed from this reaction
c. there is just enough of A and B so that everything reacts completely
A d orbital can hold a maximum of ______ electrons a. 10 b. 5 c. 6 d. 2
d. 2
How many subshells are there in the n = 4 principal shell? a. 1 b. 2 c. 3 d. 4
d. 4
How many moles of aluminum are needed to make 9 moles of molecular hydrogen? Given the reaction: 2 Al + 6 HCI --> 2 AlkCl3 + 3H2 a. 2 moles b. 3 moles c. 4 moles d. 6 moles
d. 6 moles
Which of the atoms represented below is the largest in size? a. N b. As c. Sb d. Bi e. P
d. Bi
Which of the following is true? a. Stoichiometry shows the numerical relationship between chemical quantities in a balanced chemical equation b. Stoichiometry allows prediction of the amounts of products that form in a chemical reaction based on the amounts of reactants c. Stoichiometry allows prediction of how much of the reactants are necessary to form a given amount of product d. all of the above are true e. none of the above are true
d. all of the above are true
Which of the following compounds is insoluble? a. potassium acetate b. lithium carbonate c. magnesium bromide d. aluminum sulfide
d. aluminum sulfide
A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of: a. iron (III) chloride b. potassium chloride c. magnesium chloride d. barium chloride
d. barium chloride
Which form of electromagnetic radiation has the highest frequency? a. visible light b. microwaves c. x-rays d. gamma rays e. infrared radiation
d. gamma rays
What type of a reaction occurs when a hydrochloric acid solution is mixed with a sodium bicarbonate solution? a. precipitation b. acid-base neutralization c. oxidation-reduction d. gas evolution e. no reaction
d. gas evolution
Which color of the visible spectrum has photons with the most energy? a. red b. orange c. green d. violet e. yellow
d. violet
Which of the following equations is not balanced properly? a. 2Cr + 6 HCl --> 2 CrCl3 + 3H2 b. 2NaHCO3 --> Na2CO3 + CO2 + H2O c. Cr2(SO4)3 + 6KOH --> 2Cr(OH)3 + 3 K2SO4 d. 4NH3 + 14O2 --> 4NO2 + 6H2O
D. 4NH3 + 14O2 --> 4NO2 + 6H2O
Which of the following is not evidence that a chemical reaction has occurred? a. color change when chemicals are contacted with each other b. solid formation when chemicals are contacted with each other c. gas formation when chemicals are contacted with each other d. emission of light when chemicals are contacted with each other e. All of the above are evidence of a chemical reaction
e. All of the above are evidence of a chemical reaction
Which of the following atoms is the smallest? a. Li b. Be c. B d. O e. Ne
e. Ne
Which of the following statements about balancing reactions is false? a. if there is no coefficient or subscript, a one is implied. b. when coefficients are added the type of compounds is changed in the chemical reaction c. subscripts are multiplied by the coefficients to determine the number of atoms in a compound d. Coefficients are added to compounds to ensure both sides of the reaction have equal numbers of atoms e. all of the above statements are true
e. all of the above statements are true
Which of the following statements about writing molecular, complete and net ionic equations is false? a. a molecular equation is a chemical equation showing the complete, neutral formulas for every compound in a reaction b. a complete ionic equation is a chemical equation showing all of the species as they are actually present in a solution c. a net ionic equation showing only the species that actually participate in the reaction d. a spectator ion remains unchanged in the reaction and appears on both sides of the equation e. all of the statements are true
e. all of the statements are trure
How are wavelength and amplitude of light related? a. wavelength is one-half of the amplitude b. wavelength is double the amplitude c. wavelength increases as amplitude increases d. wavelength increases as the amplitude decreases e. wavelength is independent of amplitude
e. wavelength is independent of amplitude
