What is the number of moles in 500 L of He gas at STP? •0.05 mol •0.2 mol •22 mol •90 mol
  • 4d^55s^1
  • •H3PO4
  • 22 mol
  • •20.5%
How many liters of O^2 are needed to react completely with 45.0 L of Hsub2S at STP?2Hsub2S(g) + 3Osub2(g)---> 2SOsub2(g) + 2Hsub2O(g)
  • 67.5 liters
  • 8.0 x 101 moles
  • 3.2 x 10^1
  • 1.54 x 10^-10
What is the correct name for CoCl2?•cobalt(I) chlorate •cobalt(I) chloride •cobalt(II) chlorate •cobalt(II) chloride
  • •O2; 6.0 L CO2
  • cobalt(II) chloride
  • 22 mol
  • indefinite volume
Explain how atoms (ions) are held together in an ionic bond. Give an example of an ionic compound.
  • Ionic bond- opposite charged ions are held together by their attraction to each other.Ionic compounds- Anions and cations are both present. It causes the total charge to be 0. Soduim phosphide Nasub3P
  • 500g Alsub2(SOsub4)sub3 x 1 mol Alsub2(SOsub4)sub3\342g Alsub2(SOsub4)sub3 x 3 molCa(OH)sub2 \ 1 mol Alsub2(SOsub4)sub3 x 74gCa(OH)sub2 \ 1 mol Ca(OH)sub2 = 325g Ca(OH)sub2 450g-325g = 125g
  • indefinite volume
  • a compound can only be separated into its components by chemical means
How is a pair of molecular orbitals formed?•by the splitting of a single atomic orbital *by the reproduction of a single atomic orbital *by the overlap of two atomic orbitals from the same atom •by the overlap of two atomic orbitals from different atoms
  • Charge-to-mass ratio of electrons was the same, regardless of the gas used
  • - structure of a muscle cell
  • by the overlap of two atomic orbitals from different atoms
  • Double- replacement reaction, cations are exchanged among the compounds during the reaction.First write the equation in the most basic formSilver nitrate AgNOsub3Potassium Chloride KClAgNOsub3 + KCl---> AgCl + KNOsub 3The amounts are the same on each side of the equationAgNOsub3 (ag) + KCl (ag) ---> AgCl (a) + KNOsub3 (ag)
Which of the following is a binary molecular compound?•BeHCO3 •PCl5 •AgI •MgS
  • PCl5
  • atoms are always in motion
  • 4d^55s^1
  • all of the above
A 500-g sample of Alsub2(SOsub4)sub3 is reacted with 450 g of Ca(OH)subA total of 596 g of CaSOsub4 is produced. What is the limiting reagent in this reaction, and how many moles of excess reagent are unreacted? Alsub2(SOsub4)sub3 (aq) + 3Ca (OH)sub2 (aq) ---> 2Al (OH)sub3 (s) + 3CaSOsub4 (s)
  • 8.0 x 101 moles
  • They have low melting points.
  • 500g Alsub2(SOsub4)sub3 x 1 mol Alsub2(SOsub4)sub3\342g Alsub2(SOsub4)sub3 x 3 molCa(OH)sub2 \ 1 mol Alsub2(SOsub4)sub3 x 74gCa(OH)sub2 \ 1 mol Ca(OH)sub2 = 325g Ca(OH)sub2 450g-325g = 125g
  • by the overlap of two atomic orbitals from different atoms
Which of the following can be observed only in a microscopic view?-Foam insulation-xray of a know joint-shape of a soybean plant-structure of a muscle cell
  • •copper, Cu+, cuprous ion
  • atoms are always in motion
  • They have low melting points.
  • - structure of a muscle cell
p- orbital
  • complex shape highest energy level
  • dumbbell shape2nd lowest energy level
  • studying chemicals containing carbon
  • complex shapehigher energy level than s and p
Write a balanced net ionic equation for the following reaction.Hsub3POsub4 (aq) + Ca(OH)sub2 (aq) ----> Casub3(POsub4)sub2(aq) + Hsub2O(l)
  • H^+ (aq) + OH^- (aq)--->Hsub2O(l)
  • •copper, Cu+, cuprous ion
  • - structure of a muscle cell
  • They have low melting points.
Complete and balance the following equationCd(Nosub3)sub2+NHsub4Cl---->
  • The highest occupied s and p sub-levels are partially filled.
  • Cd(NOsub3)sub2+NHsub4Cl--->CdClsub2+2NHsub4NOsub3
  • The same as that of a neon atom
  • They have mobile valence electrons.
Which of the following is NOT a characteristic of most ionic compounds?•They are solids. •They have low melting points. •When melted, they conduct an electric current. •They are composed of metallic and nonmetallic elements.
  • The highest occupied s and p sub-levels are partially filled.
  • - structure of a muscle cell
  • They have low melting points.
  • •Two reactants produce two products.
Predict the precipitate that forms when aqueous solutions of silver nitrate and potassium chloride react to form products in a double- replacement reaction. Include a discussion of how to write the complete chemical equation describing the reaction.
  • by the overlap of two atomic orbitals from different atoms
  • 500g Alsub2(SOsub4)sub3 x 1 mol Alsub2(SOsub4)sub3\342g Alsub2(SOsub4)sub3 x 3 molCa(OH)sub2 \ 1 mol Alsub2(SOsub4)sub3 x 74gCa(OH)sub2 \ 1 mol Ca(OH)sub2 = 325g Ca(OH)sub2 450g-325g = 125g
  • Double- replacement reaction, cations are exchanged among the compounds during the reaction.First write the equation in the most basic formSilver nitrate AgNOsub3Potassium Chloride KClAgNOsub3 + KCl---> AgCl + KNOsub 3The amounts are the same on each side of the equationAgNOsub3 (ag) + KCl (ag) ---> AgCl (a) + KNOsub3 (ag)
  • •double-replacement reaction
d- orbital
  • complex shapehigher energy level than s and p
  • a compound can only be separated into its components by chemical means
  • dumbbell shape2nd lowest energy level
  • complex shape highest energy level
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