Chemistry - January 2011

36 If an element, X, can form an oxide that has the formula X2O3, then element X would most likely be located on the Periodic Table in the same group as

(1) Ba    (3) In
(2) Cd    (4) Na

37 What is the total mass of KNO3 that must be dissolved in 50. grams of H2O at 60.C to make a saturated solution?

(1) 32 g     (3) 64 g
(2) 53 g    (4) 106 g

38 Which statement describes the general trends in electronegativity and metallic properties as the elements in Period 2 are considered in order of increasing atomic number?

(1) Both electronegativity and metallic properties decrease.
(2) Both electronegativity and metallic properties increase.
(3) Electronegativity decreases and metallic properties increase.
(4) Electronegativity increases and metallic properties decrease.

40 Given the balanced equation representing a reaction:

This reaction occurs more quickly when powdered iron is used instead of a single piece of iron of the same mass because the powdered iron

(1) acts as a better catalyst than the single piece of iron
(2) absorbs less energy than the single piece of iron
(3) has a greater surface area than the single piece of iron
(4) is more metallic than the single piece of iron

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