Chem Unit 2 Review.s25

Quiz
•
Science
•
11th Grade
•
Medium
+5
Standards-aligned
Laura Murphy
Used 1+ times
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40 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following elements is most likely to form a +1 ion?
Sodium
Magnesium
Aluminum
Silicon
Answer explanation
Sodium is in Group 1 of the periodic table and readily loses one electron to form a +1 ion. In contrast, magnesium, aluminum, and silicon typically form +2, +3, and +4 ions, respectively.
Tags
PA.SCI.9-12.PS.1.1
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Predict the relative reactivity of the alkali metals as you move down the group in the periodic table.
Reactivity decreases
Reactivity increases
Reactivity remains the same
Reactivity first increases then decreases
Answer explanation
As you move down the group of alkali metals, the atomic size increases, leading to a weaker attraction between the outer electron and the nucleus. This results in increased reactivity, making the correct choice 'Reactivity increases'.
Tags
PA.SCI.9-12.PS.1.1
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which element is more electronegative, Fluorine or Chlorine, and why?
Chlorine, because it has more protons
Fluorine, because it is smaller in size
Chlorine, because it is larger in size
Fluorine, because it has fewer electrons
Answer explanation
Fluorine is more electronegative than Chlorine because it is smaller in size. A smaller atomic radius allows Fluorine to attract electrons more effectively due to its higher effective nuclear charge compared to Chlorine.
Tags
PA.SCI.9-12.PS.1.1
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many valence electrons does Carbon have?
2
4
6
8
Answer explanation
Carbon has 4 valence electrons, which are located in its outer shell. This allows it to form four covalent bonds with other atoms, making it a key element in organic chemistry.
Tags
PA.SCI.9-12.PS.1.1
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following elements has the highest ionization energy?
Lithium
Beryllium
Boron
Helium
Answer explanation
Helium has the highest ionization energy among the given elements due to its small atomic size and full electron shell, making it more difficult to remove an electron compared to lithium, beryllium, and boron.
Tags
PA.SCI.9-12.PS.1.1
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
H-O-H with two pairs of dots on O
H=O=H with no dots
H-O-H with one pair of dots on O
H-O-H with three pairs of dots on O
Answer explanation
The correct Lewis dot structure for water (H2O) shows two hydrogen atoms bonded to an oxygen atom. Oxygen has six valence electrons, so it forms two bonds with hydrogen and has two lone pairs, represented as H-O-H with two pairs of dots on O.
Tags
PA.SCI.9-12.PS.1.1
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain why noble gases are generally unreactive.
They have a full outer electron shell
They have an empty outer electron shell
They have a half-filled outer electron shell
They have a single electron in their outer shell
Answer explanation
Noble gases are generally unreactive because they have a full outer electron shell. This stable configuration means they do not need to gain, lose, or share electrons, making them less likely to react with other elements.
Tags
PA.SCI.9-12.PS.1.1
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