General Chemistry Review

Magnesium reacts with a certain element to form a compound with the general formula MgX. What would the most likely formula be for the compound formed between Lithium and element X?

• Li₂X

• LiX₂

• Li₃X

• Li₂X₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Aluminum reacts with a certain nonmetallic element to form a compound with the general formula AlX. Element X is a diatomic gas at room temperature. Element X must be ______.

• Sulfur

• Fluorine

• Bromine

• Nitrogen

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Element M reacts with fluorine to form an ionic compound with the formula MF₃. The M-ion has 18 electrons. Element M is __________.

• Ar

• P

• Al

• Ca

• Sc

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which formula/name pair is incorrect?

• FeSO₄ iron(II) sulfate

• Fe₂(SO₃)₃ iron(III) sulfite

• FeS iron(II) sulfide

• FeSO₃ iron(II) sulfite

• Fe₂(SO₃)₃ iron(III) sulfide

Which is true about an endothermic chemical reaction?

• More energy is required to break bonds than is released when bonds are formed

• Less energy is required to break bonds than is released when bonds are formed

• More energy is released in breaking bonds than is required when bonds are formed

• Less energy is released in breaking bonds than is required when bonds are formed

Tags

NGSS.HS-PS1-4

This diagram shows one propane molecule and five oxygen molecules. Which of the following diagrams could represent the molecules formed when propane and oxygen molecules react?

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Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Which equation represents a single replacement reaction that can occur?

• F₂ + 2NaCl → 2NaF + Cl₂

• Cu + 2NaCl → CuCl₂ + 2Na

• Cl + 2NaF → 2NaCl + F₂

• Zn + 2NaF → ZnF₂ + 2Na

A student in the lab plans to use baking soda (NaHCO₃) and calcium chloride (CaCl₂) to try and "launch" a rocket. The balanced chemical equation for this reaction is: 2NaHCO₃ + CaCl₂ → CaCO₃ + CO₂ + 2NaCl + H₂O The student knows there is a 2:1 ratio between baking soda and calcium chloride. Do you agree with the student's reasoning that 1.0g of NaHCO₃ should be reacted with 0.5g of CaCl₂?

• Yes, because 1.0g:0.5g represents a 2:1 ratio.

• Yes, because the coefficients used in the ratio represent the number of grams of each reactant used in the chemical reaction.

• No, because the coefficients used in the ratio represent the number of moles of each reactant used in the chemical reaction.

• No, because there is not enough information given in the balanced chemical equation to determine the masses of NaHCO₃ and CaCl₂.

The student knows there is a 2:1 ratio between baking soda (NaHCO₃) and calcium carbonate (CaCO₃). Which of the following explanations best expresses the meaning of the ratio?

• If 2 grams of baking soda are used, then 1 gram of calcium carbonate will be produced.

• If 2 moles of baking soda are used, then 1 mole of calcium carbonate will be produced.

• If 2 grams of baking soda are used, then 1 gram of calcium carbonate must also be used.

• If 2 moles of baking soda are used, then 1 mole of calcium carbonate must also be used.

Tags

NGSS.HS-PS1-7

How should the student set up the dimensional analysis for calculating the mass of CaCl2 needed to react with 1.0g of baking soda?

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