Periodic Table/Elements/Compound Review

Water is an example of a(n) 

• element 
• compound 

What is a substance that is made of only one atom?

• element

• solution

• compound

Carbon and oxygen combine chemically to form carbon dioxide. Carbon dioxide is

• an ion

• a nucleus

• a compound

• an atom

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

2 atoms of hydrogen and 1 atom of oxygen combine to form water. What is the chemical formula for water?

• H₂O

• H₂O₂

• HO₂

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NGSS.MS-PS1-1

Subscripts are used to identify the number of atoms in a compound. How many atoms of carbon are in C₆H₈O₆? (Better known as Vitamin C.)

• 8

• 6

• 12

• 20

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NGSS.MS-PS1-1

Hydrogen Peroxide has a chemical formula of H₂O₂. Which atoms make up this compound?

• 2 atoms of hydrogen and 1 atom of oxygen

• 1 atom of hydrogen and 2 atoms of oxygen

• 2 atoms of hydrogen and 2 atoms of oxygen

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NGSS.MS-PS1-1

The smallest particles of an element that still have the element’s properties are

• quarks
• gluons
• protons
• atoms

The mass number of an atom is its number of

• electrons
• protons
• neutrons
• protons + neutrons

Atoms of a given element all have the same number of

• protons
• neutrons
• electrons
• two of the above

In the modern periodic table, atomic number

• increases from top to bottom within each period
• increases from left to right within each group.
• two of the above
• none of the above