(D) Use a U-tube of a smaller diameter and maintain the height of
mercury.
(E) Replace the flask with one that has the same volume but has a flat
bottom.- Which of the following can be classified as amphoteric?
(A) Na 3 PO 4
(B) HCl
(C) NaOH
(D) HSO 4 −
(E) C 2 O 4 2−- Standard conditions (STP) are
(A) 0°C and 2 atm
(B) 32°F and 76 torr
(C) 273 K and 760 mm Hg
(D) 4°C and 7.6 cm Hg
(E) 0 K and 760 mm Hg
Laboratory results showed the composition of a compound to be 75% carbon
and 25% hydrogen. What is the empirical formula of the compound?
(A) CH 4
(B) C 2 H 10
(C) C 2 H 5
(B) CH
(E) C 4 H
What is the percentage composition of sulfur in sulfur dioxide, SO 2?
(A) 43%
(B) 50%
(C) 54%
(D) 69%
(E) 74%- How many moles of hydrogen gas can be produced from the following
reaction if 65 grams of zinc and 36.5 grams of HCl are present in the reaction?
Zn(s) + 2HCl(aq) → ZnCl 2 (aq) + H 2 (g)