Unit 5 Mini Practice Test

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5B Balancing

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NGSS.HS-PS1-7

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5B Balancing

(5F) Given the balanced equation:

CaCO₃(s) + 2HCl(aq) CaCl₂(aq) + H₂O(l) + CO₂(g)

What is the total number of moles of CO₂ formed when 20. moles of HCl is completely consumed?

• 5.0 mol

• 10.0 mol

• 20.0 mol

• 26.5 mol

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5F Mol-Mol

(5F) Given the reaction:

PbCl₂(aq) + Na₂CrO₄(aq) → PbCrO₄(s) + 2NaCl(aq)

What is the total number of moles of NaCl formed when 2.2 moles of Na₂CrO₄ react completely?

• 1.1 mole

• 2.2 moles

• 3.3 moles

• 4.4 moles

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5F Mol-Mol

(5F) Given the balanced equation:

2C₄H₁₀(g) + 13O₂(g) → 8CO₂(g) + 10H₂O(g)

What is the total number of moles of O₂(g) that must react completely with 5.00 moles of C₄H₁₀(g)?

• 13 moles

• 26 moles

• 32.5 moles

• 39 moles

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5F Mol-Mol

(5G) What is the empirical formula of this compound?

• CH₃O

• C₂H₅O

• C₄H₁₀O₂

• C₈H₂₀O₄

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5G Empirical Formulas

(5G) Which pair of compounds has the same empirical formula?

• C₂H₂ and C₆H₆

• C₂H₆ and C₃H₈

• CH₃OH and C₂H₅OH

• CH₃CHO and CH₃COOH

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5G Empirical Formulas

(5G) What is the molecular formula of a compound that has a molecular mass of 42 g/mol and an empirical formula of CH₂?

• CH₂

• C₂H₄

• C₃H₆

• C₄H₁₂

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5G Empirical Formulas

(5A) Which equation represents a single replacement reaction?

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5A Types of Rxn