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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.

Question 2

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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

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Question 5

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Question 6

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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 item		Corresponding Item

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?

Carbonic acid

Nitric acid

Phosphoric acid

Sulfuric acid

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?

4 carbon atoms, 11 hydrogen atoms, and 1 oxygen atom

7 carbon atoms, 14 hydrogen atoms, and 1 oxygen atom

7 carbon atoms, 11 hydrogen atoms, and 8 oxygen atoms

6 carbon atoms, 14 hydrogen atoms, and 3 oxygen atoms

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?

SF6 is a compound containing atoms of sulfur and fluorine.

SF6 is a compound that contains seven identical atoms.

SF6 is an element with sulfur in the atom’s nucleus and fluorine outside the nucleus.

SF6 is an organic compound composed of seven different elements. 

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

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

A molecule of sorbitol contains three more oxygen atoms than a molecule of glutamine does.

A molecule of lactose contains twice as many atoms as a molecule of fructose does.

A molecule of fructose contains four more atoms than a molecule of glutamine does.

A molecule of lactose contains twice as many carbon atoms as a molecule of sorbitol does.

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?

Match up the formulas with the correct 

NH4OH

1 atom of oxygen and 6 atoms of hydrogen

C2H6O 

3 atoms of oxygen 

(NH4)2SO4

9 atoms of oxygen 

(NH4)2CO3

7 atoms of oxygen and 8 atoms of hydrogen 

Al2(CO3)3

3 atoms of oxygen and 8 atoms of hydrogen 

Cr2H8N2O7

1 atom of oxygen and 5 atoms of hydrogen

Al2O3

4 atoms of oxygen and 8 atoms of  hydrogen 