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A metre rule of mass 15g pivoted at 30cm mark is balanced horizontally when a load of 25g was hung at the 18cm markI)sketch the
1. 0 answers
2. 156 views
In the protein, Val-Tyr-His-Pro, which amino acid contains the N-terminal group?1) histidine 2) proline 3) valine 4) tyrosine
1. 0 answers
2. 305 views
Question: Which one of the following molecules can rotate freely around its carbon-carbon bond?a) pentane b) cyclopropane c)
1. 1 answer
2. 472 views
Which name is NOT correct?a) 2, 3-dimethyloctane b) 2, 6, 6-trimethylheptane c) 2, 3, 3-trimethyloctane d) 2, 2-dimethylbutane
1. 1 answer
2. 297 views
Which statement below is false concerning nomenclature rules for alkanes?1) The name of the alkane is written as a single word.
1. 2 answers
2. 698 views
How many grams of Ca(OH)2 are needed to neutralize 5.00 g of 3-methylbutanoic acid?a) 4.20 g b) 2.10 g c) 3.63 g d) 1.81 g
1. 1 answer
2. 553 views
Which one of the following molecules is the most polar?1) acetic acid 2) acetaldehyde 3) ethylene 4) ethane
1. 1 answer
2. 638 views
Which of the following statements about cycloalkanes is true?1) The bonds in cyclopropane and cyclobutane are weaker than other
1. 1 answer
2. 1,032 views
Which of the following molecules does not have a dipole moment?1) CBr2=CBr2 2) NCl3 3) CH3NH2 4) HCl
1. 0 answers
2. 547 views
Which of the following is not true?a) The sp3 hybrid orbitals are degenerate. b) An sp3 hybrid orbital may hold a lone pair of
1. 2 answers
2. 2,830 views
The orbital hybridization on the carbon atom in S CN - isa) sp. b) sp2. c) sp3. d) sp3d2.
1. 1 answer
2. 972 views
Which of the following should have the largest dipole moment?a) F2(g) b) SO2(g) c) RbBr(g) d) CH2I2(g)
1. 1 answer
2. 843 views
What is the hybridization of Chlorine in ClO3-?a) sp b) sp2 c) sp3 d) s
1. 2 answers
2. 1,205 views
Which of the following exhibits ion-dipole forces?1) KBr(s) 2) NaF(aq) 3) Ag(s) 4) Cl2(g)
1. 1 answer
2. 1,162 views
Which of the following compounds exhibits only dispersion and dipole-dipole intermolecular interactions?1) Na 2) HCl 3) BH3 4)
1. 1 answer
2. 995 views
Which of the following compounds exhibits only dispersion and dipole-dipole intermolecular interactions?1) Na 2) HCl 3) BH3 4)
1. 0 answers
2. 552 views
Which of the following molecules does not have a dipole moment?1) CBr2=CBr2 2) NCl3 3) CH3NH2 4) HCl
1. 2 answers
2. 937 views
1) What are the bond angles in the molecular model of SI6?2) What is the bond angle in the following molecular model of H2Te? 3)
1. 2 answers
2. 1,106 views
Which of the following compounds experience the strongest dipole-dipole attractions?a) CF4 b) CCl4 c) CF2Cl2
1. 1 answer
2. 965 views
Identify the intermolecular force, or forces that predominate in Al2O3 (check all that apply)Group of answer choices 1. ionic 2.
1. 1 answer
2. 3,707 views
Which of the following electron dot structures would have a charge of +2 and 1 valence electron?a) Mg2+ b) B2+ c) Al2+ d) Na2+
1. 1 answer
2. 421 views
How many valence electrons does each of the following species contain?BN = HF = OH[1-] = CN[1-] =
1. 2 answers
2. 1,814 views
What kids of intermolecular forces must be overcome as CO2 sublimes? (check all that apply)1. dispersion forces 2. dipole dipole
1. 1 answer
2. 1,522 views
Aluminum and Fluorine form a substance with the formula AlF3. Is the bond between Al and F polar?If so which atom carries the
1. 2 answers
2. 1,437 views
How much energy, in joules, is required to break the bond in ONE chlorine molecule? The bond energy of Cl2 is 242.6kJ/mol?
1. 1 answer
2. 815 views
Based on predicted trends in the periodic table: Order the following in terms of increasing atomic or ionic radius:Cd2+ Sn4+ Ag+
1. 0 answers
2. 247 views
Calculate the lattice energy in kJ/mol for CaCl2 from the following information: Energy needed to vaporize one mole of Ca(s) is
1. 1 answer
2. 993 views
Give the 4 quantum numbers for the highest energy electron in the valence shell of Osmium.
1. 2 answers
2. 880 views
Mycobacterium tuberculosis, the organism that causes tuberculosis can be completely destroyed by irradiation with UV light with
1. 2 answers
2. 337 views
An energetically excited hydrogen atom has its electron in a 5f subshell. The electron drops down to the 3d subshell, releasing
1. 1 answer
2. 1,026 views
The lines in the visible portion of the hydrogen spectrum are called the Balmer series, for which m=2 in the Rydberg equation.
1. 2 answers
2. 742 views
4. Vitamin C, M= 176.12 g/mol, is a compound of composed of carbon, hydrogen, and oxygen. Vitamin C is found in many natural
1. 2 answers
2. 4,582 views
A 125 mL flask contains 75 kPa Cl2 at 22 ˚C.(a) How many moles of Cl2 are in the flask? (b) What mass of Cl2 is in the flask?
1. 1 answer
2. 747 views
Rubidium has two naturally occurring isotopes: 85Rb and 87Rb. The natural abundance of 85Rb is 72.165% and it has an isotopic
1. 2 answers
2. 1,345 views
When iron (Fe) rusts (reacts with O2), the product is iron(III) oxide (Fe2O3).If 25 g Fe is reacted with 25 g O2 in a sealed
1. 3 answers
2. 2,304 views
You are given a solution that contains one of the ions Ag+, Pb2+ or Ba2+. Develop a procedure to determine which ion is present.
1. 1 answer
2. 3,102 views
If 1.22 grams of N2 has a volume of 3.81L and a pressure of 5.49atm, what is its Kelvin Temperature?
1. 2 answers
2. 245 views
A 3-L flask contains nitrogen gas at 21°C and 0.95atm pressure.What is the final pressure in the flask if an additional 4 g of
1. 0 answers
2. 442 views
A 0.429-g sample of gas occupies 125 mL at 60. cm of Hg and 25°C.The molar mass of the gas is ________ g/mol?
1. 0 answers
2. 445 views
Barometric pressure changes are used by meteorologists to forecast short-term changes in the weather and are reported in units
1. 2 answers
2. 386 views
A 3-L flask contains nitrogen gas at 21°C and 0.95atm pressure. What is the final pressure in the flask if an additional 4 g of
1. 0 answers
2. 336 views
If 1.22 g of N2 has a volume of 3.81L and a pressure of 5.49atm, what is its Kelvin Temperature?
1. 0 answers
2. 233 views
A 0.429-g sample of gas occupies 125 mL at 60. cm of Hg and 25°C. The molar mass of the gas is ________ g/mol?
1. 1 answer
2. 1,163 views
A closed container is filled with oxygen. The pressure in the container is 453.97 kPa . What is the pressure in millimeters of
1. 0 answers
2. 370 views
When the following equation is balanced in an acidic solution how many electrons are transferred?MnO4- + H2SO3 --> SO42- + Mn2+
1. 1 answer
2. 2,918 views
If a reaction requires 0.13moles of NaNO3, how many milliliters of 1.73M NaNO3 are needed?
1. 1 answer
2. 554 views
The substance that causes oxidation by accepting electrons is called 1) _____________and the substance that causes reduction by
1. 1 answer
2. 322 views
Which of the following are considered insoluble?PbI2 NaNO3 Na2S Mg(OH)2 NH4OH AgCl
1. 1 answer
2. 511 views
1) Substances that dissociate nearly 100% in solution to produce a conducting solution of ions are called _______________2)
1. 1 answer
2. 741 views
A solution of sodium sulfate was treated with 0.29M Barium Chloride solution until all the sulfate ion had reacted. The reaction
1. 1 answer
2. 419 views
What are the subscripts associate with C, H and O when a 5.048g sample of a compound undergoes combustion to produce 7.406g of
1. 3 answers
2. 430 views
A white powder used in paints, enamels, and ceramics has the following percentage composition Ba = 69.6%, C = 6.09% and O =
1. 1 answer
2. 1,566 views
Consider the reaction 2H2 + O2 --> 2H2OWhat is the mass of water produced when 11.0 grams of O2 reacts with excess H2? Is the
1. 1 answer
2. 936 views
Formula: CaCO3(s) + HCl(aq) --> CO2(g) + CaCl2(aq) + H2OHow many grams of CO2 can be made by reacting 125 g of CaCO3 with 125
1. 3 answers
2. 1,682 views
Question: If we mix together 32.2 g of salicylic acids with 15.6 g of acetic anhydride in this reaction we obtain 27.8grams of
1. 3 answers
2. 501 views
Chlorophyll, the green pigment in leaves, has the formula C55H72MgN4O5. If 4.5g of Mg is available to a plant for chlorophyll
1. 3 answers
2. 1,430 views

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