Other Chemistry Answers

1. what are the following is not a difference between compounds and mixtures?
A. Compounds always have definite composition, but mixtures never have definite composition.
B. Compounds can only be separated by chemical process, but mixtures can be separated by physical process.
C. Compounds are always pure substance, but mixtures never are.
D. Compaz are always homogeneous, but mixtures are always heterogeneous.

2. What type of bond results from sharing of four elections?

3. What principle states that the elements tend to react chemically to achieve a noble gas electron configuration, whether by losing, gaining, or sharing electrons?
A. Hunds rule
B. Valance rule
C. Octet rule
D. Uncertainty principle

1. Calculate the molarity of solution prepared by dissolving 80.0 g hydrogen fluoride in water to make 500.0 mL of solution; the more mass of HF is 20.01 g/mol.

2. A chemist needs to repair 2.50 mL of 0.100 M ammonia. How much concentrated (14.8 M) ammonia does he need?

3. Determine the freezing point of a solution containing 50.0 g of sucrose dissolved in 750. g water; round to the nearest 0.01°C. (Kf for water is 1.86°C/m, and a molar mass of sucrose is 342.3 g/mol.)

4. Explain why I cannot soft drink would be expected to fizz much more when opened at the peak of Mt. Everest (P ATM equals 260 TORR) then when open at sea level (P ATM equals 750 TORR)

1. at 20°C, The rate of a particular reaction is 0.001 M/s; what is the rate expected to be at 60°C, assuming all other factors remain the same?

2. Two compartments, labeled A and B, are separated by semipermeable membrane. What happens if the compartment A is filled with honey (a solution of sugar dissolved in water) and apartment B is filled with distilled water?

3. Which statement best explains why the following reaction is not likely to occur in a single step? 2C6H6(1)+15 O2(g)---> 12 CO2(g) + 6 H2O(g)
A. Exothermic reactions typically require several steps.
B. Gases do not usually react directly with liquids or solids.
C. The 17-body collision required is extremely unlikely.
D. The reaction is spontaneous and is not reversible.

The Half life period for catalytic decomposition of AB3 at 50mm is found to be 4 hours and at 100mm it is 2 hours. the order of reaction is ?

A determination calls for 125cm3 of glacial acetic acid .what mass of the acid is equivalent to the required volume
a)20.8g
b)62.5g
c)116.8g
d)132.3

In a reversible reaction Co2+H2--->H2O+Co ,the concentration of Co2 is 0.70 Moles per dm3 and of H2 is 80.38 mole per dm3 and the concentrations of Co and H2O are each 9.46 moles per dm3.What is the value of the equilibrium constant K
A)0.168
B)0.233
C)0.628
D)1.591

what is the solubility, in moles per dm3 of co3^= ions in a saturated solution of silver carbonate Ag2Co2
a)1.15x10^-4
b)1.15x10^-6
c)2.48x10^-4
d)2.48x10^-6

What is the concentration of the H+ ions in a 0.001N KOH solution

a)10^-17
b)10^-11
c)10^-10
d)10^-3

how many cubic centimeters of concentrated nitric acid are needed to obtain a mass of 76g

a)14.2cm3
b)53.5cm3
c)76.0
d)107.9

a solution consisting of 290g of NaCl , was made up to a volume of 2500 cm3 with water. what is the normality of the solution? (use 58.4428 g as the molecular mass of NaCl)

a)0.504N
b)1.160N
c)1.985N
d)2.338N