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100
Carry out the following operations, and express the answers with the appropriate number of significant figures: A) 12.0550 + 9.05
What is A) 21.11
100
. Determine the empirical formulas from these molecular formulas: a. C6H12O6 b. P4O6 c. N2O
What is a. CH2O b. P2O3 c. N2O
100
Balance the following equation: CH4 + Cl2 ---> CCl4 + HCl
What is CH4 + 4Cl2 ---> CCl4 + 4HCl
100
What are the quantum numbers for Tungsten (W
What are 5d8 5,2,0,1/2
100
What is the trend of ENC, Left to right and top to bottom?
What is A: left to right : up top to bottom: down
200
By using estimation techniques, arrange these items in order from shortest to longest: A) 57 cm length of string B) 14 in long shoe C) 1.1 m length of pipe
What is Answers: A) 14in < 57 cm < 1.1 m
200
. Determine the most stable ion for each of these elements: a. Ba b. O c. F
What isAns: a. Ba+2 b. O-2 c. F-1
200
What is the mass/mole of Ca(OH)2
What is 74
200
what is the outer electronic configuration for Gold
What is 5d9
200
What is the exception to atomic size going down left to right in a given period.
What is A: Group 7 and 8
300
Make the following conversions: 233 degrees C to K
What is 506 K
300
. What are the empirical formulas of the compounds formed by: a. Al+3 and O-2 ions b. Mg+2 and NO3-1 ions
What is Ans: a. Al2O3 b. Mg(NO3¬)2
300
How many atoms are contained in 2 moles of water?
What is 6 moles of atoms
300
How many unpaired electrons does Cobalt have
What is 3d7 or 3
300
Which element has the highest electron affinity? A
What is : Flourine
400
Gold can be hammered into extremely thin sheets called gold leaf. If a 200 mg piece of gold (density = 19.32 g/cm3) is hammered into a sheet measuring 2.4 × 1.0 ft, what is the average thickness of the sheet in meters? How might the thickness be expressed without exponential notation, using an appropriate metric prefix?
What is Answers: A) 4.6 × 10-8 m B) 46 nm
400
Symbol Co+3 Protons 34 76 80 Neutrons 46 116 120 Electrons 36 78 Net Charge +2
What is Symbol Co+3 Se-2 Os+2 Hg+2 Protons 27 34 76 80 Neutrons 32 46 116 120 Electrons 24 36 78 Net Charge +3 -2 +2 +2
400
Which contains more atoms, 10g of O2 or 20g of Li3N
What is 20 grams of Li3N
400
What is the relationship between frequency and energy
What is inverse
400
Which of the following has the highest ionization energy? Mg, Na, Fr, He
What is He
500
Convert 55 km per hour to cm per hour
What is 5500000 cm/hour
500
. Predict whether each of the following is molecular or ionic.
What is Ans: a. Molecular b. Molecular c. Ionic
500
. In the reaction N2O5 + H2O ---> 2HNO3, with 10g of N2O5 and 5g H2O, which is the limiting reactant
What is N2O5
500
How many orbitals are present in the 5th level
What is a total of 25
500
What are the factors that affect electron affinity?
What is A: size, Enc, electron configuration