Pretest Module 8

What is the left part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Reactants

• Yields

• Products

• Chemical equation

• idk

What is the number before a chemical formula called?

Example: 2H₂ + O₂ ---> 2H₂O

• Coefficient

• Atom

• Subscript

• Equation

• idk

In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products?

• (s)

• (g)

• (l)

• (w)

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How many Hydrogen are in 4H₂O?

• 6

• 4

• 2

• 8

• idk

How many atoms of carbon (C) are in C₆H₁₂O₆?

• 3

• 6

• 12

• 24

• idk

How many O's are in Al₂(SO₄)₃

• 4

• 12

• 7

• 24

• idk

What is the Law of Conservation of Mass?

• It states that matter cannot be created or destroyed.

• It states that energy cannot be created or destroyed.

• It states that matter can be created or destroyed.

• It states that sound can be created or destroyed.

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• There are 2 hydrogens on the reactant side and 3 hydrogens on the product side
• There are 2 hydrogens on the reactant side and 1 oxygen on the product side
• There is K on the reactant side and KOH on the product side
• There are 2 hydrogens on the reactant side and only 1 hydrogen on the product side
• idk

• Carbon

• Hydrogen

• Oxygen

• idk

• replace Na on the reactant side with Na

• delete the 2 in front of the NaCl

• replace Cl with Cl

• add a 2 in front of the Na on the reactant side

• idk