Question 1. 1. (TCO 3) Which of the statements about transition metals is false?

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Question 1. 1. (TCO 3) Which of the statements about transition metals is false? (Points : 2)

       Transition metals can gain or lose electrons to form anions or cations.
       Transition metals can gain a variable number of electrons to form two or more different anions.
       All transition metals form at least two different ions.
       All of the above statements are false.
       All of the above statements are true.

Question 2. 2. (TCO 3) Hydrogen combines with oxygen to form water. Which of the statements below best describes the bond that forms between hydrogen and oxygen? (Points : 2)

       It is an ionic bond in which the hydrogen and oxygen atoms are held together by sharing electrons.
       It is an ionic bond in which the hydrogen atom accepts electrons from the oxygen atom.
       It is a covalent bond in which the hydrogen atom donates electrons to the oxygen atom.
       It is a covalent bond in which the hydrogen atom accepts electrons from the oxygen atom.
       It is a covalent bond in which the hydrogen and oxygen atoms are held together by sharing electrons.

Question 3. 3. (TCO 3) Which of the following bonds would you predict to be ionic? (Points : 2)

       C-P
       Rb-Br
       Br-P
       S-F
       C-H

Question 4. 4. (TCO 3) Which is the overall charge of a polyatomic ion? (Points : 2)

       Polyatomic ions do not have an overall charge.
       It is negative.
       It is positive.
       It may be negative or positive.
       Too little information is given to tell.

Question 5. 5. (TCO 3) Trevon has a balloon that contains 0.01 mole of helium. How many particles of helium are in the balloon? (Points : 2)

       6.02
       3.01

Question 1. 1. (TCO 3) Which of the statements about transition metals is false? (Points : 2)

       Transition metals can gain or lose electrons to form anions or cations.
       Transition metals can gain a variable number of electrons to form two or more different anions.
       All transition metals form at least two different ions.
       All of the above statements are false.
       All of the above statements are true.

Explanation / Answer

1) All of the above statements are false

2)    It is a covalent bond in which the hydrogen and oxygen atoms are held together by sharing electrons.

3) Rb-Br

4) It may be negative or positive

5)

number of particles = moles x avagadro number

number of particles = 0.01 x 6.023 x 1023

number of particles = 6.023 x 10^21

6)

when energy is released the reaction is exothermic

7) is the substance present in the smallest concentration

8) 0.9% NaCl

9)

apply M1V1 = M2V2

0.7 x V = 200 x 1.4

V = 400 ml

10)

moles of KCl = mass / molar mass

moles of Kcl = 74.55 / 74.55

moles of Kcl = 1

molarity = moles / volume

molarity = 1/ 0.5

molarity = 2 M

11) the reaction is single replacement

the eqaution is not balanced

2Al + 3H2S04 ----> Al2(S04)3 + 3H2

from the above reaction

1 mole of Al reacted completely gives 0.5 moles of Al2(S04)3

mass of Al2(S04)3 = moles x molar mass = 0.5 x 342

mass of AL2(S04)3 produced = 171 g

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