Final Exam Review Part 2

Sulfur (S) is a yellow, powdery substance. It is a poor conductor and when made into a compound can sometimes smell burned. Which of the following statements correctly describe atoms of sulfur (S)?

• A. Sulfur (S) atoms have 16 protons.

• B. Sulfur (S) atoms have 16 valence electrons.

• C. Sulfur (S) atoms have 17 electrons.

• D. Sulfur (S) atoms have 6 electrons.

In order to perform an experiment, a chemist needs an element that has similar properties of potassium (K) but has a lower atomic mass. Which should the chemist select for the experiment?

• Rubidium (Rb)

• Sodium (Na)

• Magnesium (Mg)

• Calcium (Ca)

Refer to the Periodic Table above. A student is asked to identify an element that is a non-reactive gas and does not conduct electricity. Within which group on the Periodic Table would the element most likely be located?

• Group 2

• Group 14

• Group 16

• Group 18

Element R and Element Q have the same number of valence electrons. These elements both have similar chemical behavior, but Element R has 1 energy level less than Element Q. Which statement best describes the positions of the two elements in the periodic table?

• The two elements are in the same period, with Element R the first element in the period and Element Q the last element.

• The two elements are side by side in the same period, with Element Q to the left of Element R.

• The two elements are in the same group, with Element R just above Element Q.

• The two elements are in the same group, with Element Q at the top of the group and Element R at the bottom.

Elements are arranged on the periodic table based on their physical and chemical properties. Which of the following elements have reactivity that is similar to arsenic (As) and have more protons in their nucleus?

• selenium (Se) and bromine (Br)

• potassium (K) and calcium (Ca)

• nitrogen (N) and phosphorus (P)

• antimony (Sb) and bismuth (Bi)

Which of the following represents a single atom? Select TWO correct answers.

• Mn

• O2

• K2O

• 2K

• I

The chemical formula for sulfuric acid is H2SO4. Which of the following statements accurately describe the atoms involved in the formula for sulfuric acid? Select TWO correct answers.

• There are 4 sulfur (S) atoms involved in the chemical formula.

• There are twice as many hydrogen (H) atoms as there are sulfur (S) atoms.

• There are twice as many sulfur (S) atoms as there are hydrogen (H) atoms.

• There are twice as many oxygen (O) atoms as there are hydrogen (H) atoms.

• There are 6 total atoms involved in the chemical formula.

Which of the following formulas contain the same number of oxygen atoms?

• Formulas I and II

• Formulas II and IV

• Formulas I, II, and III

• Formulas I, II, and IV

According to the Chemical Compounds table above, how many total atoms are in Glucose?

• A. 3

• B. 18

• C. 24

• D. 432

The above diagram is a model of a molecule of methane. What is the formula for methane?

• CH₈

• C₈H₄

• CH₄

• C₈H₈