How many moles are in 22.2 grams of Calcium chloride, CaCl2?
A. 0.2 moles
B. 0.3 moles
C. 0.4 moles
D. 0.5 moles
The mass of 3.2 moles of ammonia (NH3) gas?
A. 53.4 grams
B. 54.4 grams
C. 55.4 grams
D. 56.4 grams
Which of the following aqueous solutions would have the highest boiling point?
A. 0.20 m glucose
B. 0.20 m NaCl
C. 0.15 m CaCl2
D. 0.25 m sucrose
The octane number of zero is assigned to:
A. 2-methyl octane
B. n-heptane
C. iso-octane
D. 3-methyl octane
The heat required to raise the temperature of body by 1 K is called:
A. specific heat
B. thermal capacity
C. water equivalent
D. None of the above
The most commonly used bleaching agent is:
A. alcohol
B. carbon dioxide
C. chlorine
D. sodium chlorine
The main buffer system of the human blood is:
A. H2CO3 – HCO3
B. H2CO3 – CO32-
C. CH3COOH – CH3COO–
D. NH2CONH2 – NH2CONH+
The molecules of which gas have highest speed?
A. H2 at -73oC
B. CH4 at 300 K
C. N2 at 1,027oC
D. O2 at 0oC
The metallurgical process in which a metal is obtained in a fused state is called__________?
A. smelting
B. roasting
C. calcinations
D. froth floatation
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of:
A. p-electrons in Ne(Z = 10)
B. s-electrons in Mg(Z = 12)
C. d-electrons in Fe(Z = 26)
D. p-electrons in CI(Z = 17)
