Unit 4 Lesson 2 Test: Chemical Equations

Cassidy and Finn were doing a science experiment where they burned a piece of paper. They noticed that the mass of the remaining ash was less than the mass of the original paper. Which statement best explains this phenomenon?

• The ash has less volume than the paper.

• Some of the matter is destroyed during the reaction.

• The mass of the ash cannot be accurately determined.

• Some of the products of the reaction were given off as a gas.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

• A
• B
• C
• D

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When coal is burned, sulfur is released into the air, where it reacts with oxygen to produce sulfur dioxide and sulfur trioxide. Which of these is true of this process?

• The identity of each reactant remains the same.
• Sulfur dioxide and sulfur trioxide are the reactants in this change.
• The products have different chemical properties than those of the reactants.
• The products contain more sulfur atoms and fewer oxygen atoms than the reactants.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Annabelle and Connor are working on a science project about rusting. They need to complete the balanced chemical equation showing the process of rusting. Which number should they use?

• 1

• 2

• 4

• 12

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Zoe and Dominick are working on a science project. They need to write down the combination of chemical symbols and numbers that represents a single unit of water. This combination is known as a_________________________.

• chemical formula

• chemical equation

• product

• reactant

In a science class, Nolan is learning about chemical formulas. His teacher explains that a ______________, a number below and to the right of the symbol, shows how many atoms of that element there are.

• subscript

• superscipt

• exponent

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NGSS.MS-PS1-1

Lulu and Ella are studying a mineral sample of hematite, which has the chemical formula Fe₂O₃. Identify the correct number of atoms present.

• 3 Iron Atoms and 2 Oxygen Atoms

• 2 Iron Atoms and 3 Oxygen Atoms

• 3 Iron Atoms and 3 Oxygen Atoms

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NGSS.MS-PS1-1

Nolan and Zoe are studying minerals in their science class. They come across a sample of halite. How many atoms are present in the mineral halite?

• 1 sodium atom and 1 chlorine atom

• 0 sodium atom and 0 chlorine atom

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NGSS.MS-PS1-1

Annabelle and Jacob are studying minerals in their science class. They come across a mineral called pyrite, which has the chemical formula FeS₂. Select the correct amount of atoms in the mineral below.

• 0 iron atoms and 1 sulfur atom

• 0 iron atoms and 2 sulfur atom

• 1 iron atom and 2 sulfur atom

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NGSS.MS-PS1-1

Dominick and Jacob are studying minerals in their geology class. They come across a mineral with the formula Ca3Al2(SiO4)3. How many OXYGEN Atoms are present in this mineral?

• 4

• 7

• 12

• 14

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NGSS.MS-PS1-1