|
Questions
|
Answer |
Explanations |
31 Which electron configuration represents an
excited state for a potassium atom?
(1) 2-8-7-1 (3) 2-8-8-1
(2) 2-8-7-2 (4) 2-8-8-2 |
2 |
19 electrons and 1 is promoted |
32 A sample of an element is malleable and can
conduct electricity. This element could be
(1) H (3) S
(2) He (4) Sn |
4 |
properties of metals |
33 Which general trend is demonstrated by the
Group 17 elements as they are considered in
order from top to bottom on the Periodic Table?
(1) a decrease in atomic radius
(2) a decrease in electronegativity
(3) an increase in first ionization energy
(4) an increase in nonmetallic behavior |
2 |
Table S |
34 Which element is a liquid at 758 K and standard
pressure?
(1) gold (3) platinum
(2) silver (4) thallium |
4 |
Table S Melting Points |
35 Which equation represents a decomposition
reaction?
(1) CaCO3(s) ==>CaO(s) + CO2(g)
(2) Cu(s) + 2AgNO3(aq) ==>2Ag(s) + Cu(NO3)2(aq)
(3) 2H2(g) + O2(g) ==>2H2O(l)
(4) KOH(aq) + HCl(aq) ==>KCl(aq) + H2O(l) |
1 |
decomp AB==> A + B |
36 A compound has the empirical formula CH2O
and a gram-formula mass of 60. grams per mole.
What is the molecular formula of this compound?
(1) CH2O (3) C3H8O
(2) C2H4O2
(4) C4H8O4 |
2 |
CH2O= 30g/mol
C2H4O2
=60g/mol |
37 Which formula represents strontium phosphate?
(1) SrPO4 (3) Sr2(PO4)3
(2) Sr3PO8 (4) Sr3(PO4)2 |
4 |
Sr2+ PO43-
Sr3(PO4)2 |
 |
4 |
Ionic
Metals no dots + charge
Nonmetals 8 dots - charge |
39 Which statement describes the transfer of heat
energy that occurs when an ice cube is added to
an insulated container with 100 milliliters of
water at 25°C?
(1) Both the ice cube and the water lose heat
energy.
(2) Both the ice cube and the water gain heat
energy.
(3) The ice cube gains heat energy and the
water loses heat energy.
(4) The ice cube loses heat energy and the
water gains heat energy. |
3 |
heat goes from HOT TO COLD |
40 What is the mass of NH4Cl that must dissolve in
200. grams of water at 50.°C to make a saturated
solution?
(1) 26 g (3) 84 g
(2) 42 g (4) 104 g |
4 |
Table G...DOUBLE the results it is
200g of Water |