NGSS.MS-PS1-1

Why is water classified as a compound?

• Because it is an element, which consists of only one type of atom.
• Because it is a substance, which can easily be separated.
• Because it is a substance composed of two or more kinds of atoms bonded together.
• Because it is an unevenly mixed solution, or a heterogeneous mixture.

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The central region of an atom where its neutrons and protons are is its 

• nucleus 
• electron cloud
• core 
• center 

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Elements are made of 

• many types of atoms 
• the periodic table
• one type of atom 
• molecules 

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Theory or law?

Atomic _____ of matter: All matter is made up of atoms. Explains why matter behaves a certain way.

• Theory

• Law

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What is the total number of oxygen atoms on the reactant side of the equation shown below?

CH3COOH + NaHCO3 → CH3COONa + H2O + CO2

• 2

• 3

• 5

• 7

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What is the atomic number of this element?

• 13

• 9

• 4

• 8

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What element is represented in this atomic model?

• Carbon

• Hydrogen

• Aluminum

• Lithium

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The Sun is our star made mostly of

• helium

• hydrogen and helium

• hydrogen

• helium, hydrogen, and gold

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Carbon

• CA

• C

• Ca

• Cn

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A water molecule is made up of two hydrogen (H) atoms and one oxygen (O) atom. In a chemical equation, what would be the correct way to represent six water molecules?

• 6H2O

• 6HO2

• 2H6O6

• 12H6O

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