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8.5 D Quiz #1

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8 questions
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8.5 D Counting atoms and elements in a chemical formula
Question 1
1.

The names and chemical formulas of four substances are shown in the chart.


Which substance listed in the chart is made up of the most atoms?

Question 2
2.

A compound secreted by honeybees to paralyze intruders in their hive is known as 2-heptanone. The formula for this compound is shown.

How many atoms of each element are in one molecule of 2-heptanone?

Question 3
3.

Barium sulfate, BaSO4 , is a white crystalline solid that is insoluble in water. It is used by doctors to diagnose problems with the digestive system. Barium hydroxide, Ba(OH)2 , is also a white crystalline solid and is used in wastewater treatment.

How many more oxygen atoms are represented in the formula for barium sulfate than in the formula for barium hydroxide?

Question 4
4.

Sulfur hexafluoride, SF6, is a very stable, nonflammable gas at room temperature. It is used in many electronic products because it is a good electrical insulator.

Which statement describes the composition of sulfur hexafluoride?

Question 5
5.

The table lists some compounds found in foods and their formulas.


Based on this information, which of these statements is NOT true?

Question 6
6.

Students in a science class made ball-and-stick models of the substances they were studying. The key shows the elements the students used in their models.


Which model represents a compound containing at least one atom of carbon?

Question 7
7.

A student is using colored beads to make a model of aluminum sulfate, Al2(SO4)3. Aluminum atoms are represented by blue beads, sulfur atoms by yellow beads, and oxygen atoms by green beads. Identify how many of EACH bead color you would need to model this compound.

Question 8
8.

Draggable itemarrow_right_altCorresponding Item
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Sulfuric acid
SF6 is an organic compound composed of seven different elements.
A molecule of lactose contains twice as many carbon atoms as a molecule of sorbitol does.
Match up the formulas with the correct
C2H6O
1 atom of oxygen and 6 atoms of hydrogen
Cr2H8N2O7
3 atoms of oxygen
Al2(CO3)3
9 atoms of oxygen
(NH4)2SO4
7 atoms of oxygen and 8 atoms of hydrogen
Al2O3
3 atoms of oxygen and 8 atoms of hydrogen
(NH4)2CO3
1 atom of oxygen and 5 atoms of hydrogen
NH4OH
4 atoms of oxygen and 8 atoms of hydrogen