Unit 1 - Test Corrections

• For every 4 atoms of carbon, there are 4 atoms of hydrogen.

• For every 4 atoms of carbon, there is 1 atom of hydrogen.

• For every 1 atom of carbon, there are 4 atoms of hydrogen.

• For every 1 atom of carbon, there is 1 atom of hydrogen.

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Which of the following is an element followed by a compound that contains that element?

• NaCl --> C

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• 3
• 7
• 2
• 4
• 6
• 8

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• There are 24 total atoms involved in the chemical formula for a molecule of serontonin.

• There are 3 different elements that make up the chemical formula for a molecule of serotonin.

• There are 25 total atoms involved in the chemical formula for a molecule of serotonin.

• There are an equal number of hydrogen atoms as there are carbon, nitrogen, and oxygen atoms combined.

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• There are 4 phosphorous atoms represented in the chemical formula.

• There is 1 phosphorous atom represented in the chemical formula.

• There are 2 different elements involved in the chemical formula.

• There are 7 total atoms represented in the chemical formula.

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Students were asked to classify substances as elements or compounds. Which student correctly identified all four substances?

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• There are 5 different elements represented in the chemical formula.

• There are 2 carbon atoms represented in the chemical formula.

• There are 5 total atoms represented in the chemical formula.

• There are 3 hydrogen atoms represented in the chemical formula.

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

• Mn

• 2K

• I

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• The subscript is distributed to all element totals, so the total number of atoms in this molecule equals 9.

• The subscript is distributed to the N and the O making the total number of atoms in this formula equal 6.

• The subscript is only distributed to the O making the total number of atoms in this formula equal to 5.

• Subscripts only affect the formula if they are attached to a parenthesis, so the total number of atoms in this formula is 3.

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• For every 2 atoms of hydrogen, there is 1 atom of oxygen.

• For every 1 atom of hydrogen, there are 2 atoms of oxygen.

• For every 2 atoms of hydrogen, there are 4 atoms of oxygen.

• For every 1 atom of hydrogen, there is 1 atom of oxygen.

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NGSS.MS-PS1-1