24-25 Chemistry Unit 3: Review

What charge do Group 13 elements tend to acquire when they form ions?

• 3-

• 5-

• 5+

• 3+

To achieve a noble gas configuration, oxygen requires 2 electrons, and hydrogen needs to receive how many electron(s)?

• 3

• 2

• 0

• 1

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Based on the periodic table shown, elements form columns B and E will combine in which ratio to form an ionic compound?

• 3 B : 2 E

• No likely combination

• 2 B : 3 E

• 3 B : 1 E

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

The illustration below shows an example of which type of reaction?

• Fuel + O2 → CO2 + H2O

• Combustion

• A + BC → B + AC

• Synthesis

• A + B → AB

• Double Displacement

• AB → A + B

• Single Displacement

• AB + CD → AD + CB

• Decomposition

Which of these formulas is written in correctly? Choose two (2).

• (NH₄)₂PO₄

•  CaO₂

• Al₂(CO₃)₃

• Al₂O₃

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NGSS.HS-PS1-1

Name the ionic compound represented by each formula: Na₂SO₄ and NH₄NO₃.

What is the formula for calcium iodine?

• CaI

• Ca₂I₂

• CaI₂

• Ca₂I

Which combination of bonds is present in a oxygen molecule ?

• 1 sigma bond only

• 1 sigma bond and 1 pi bond

• 2 pi bonds

• 1 sigma bond and 2 pi bonds

The bond dissociation energy of chlorine is 243 kJ/mol, of sulfur is 430 kJ/mol, and of phosphorus is 938 kJ/mol. Which molecule has the strongest covalent bond as well as the shortest bond length?

• Chlorine

• Sulfur

• Phosphorus

• Nitrogen

The electronegativity of H is 2.20 and of Cl is 3.55. What type of bond does a HCl molecule have?

• polar ionic

• polar covalent

• covalent

• Ionic

Tags

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