Chem Unit 3 Review

In ionic bonds electrons are (a)  

In covalent bonds electrons are ​ (b)   ​

• completely given/taken.
• shared between atoms.

Answer explanation

Vocab from quizlet

Tags

HS-PS1-A-4

HS-PS1-A-3

​ (a)   compounds electrons are shared evenly.

(b)   compounds electrons favor one atom more than another.

• Non-Polar
• Polar
• Ionic
• Covalent
• Metallic

Answer explanation

Vocab from quizlet

Tags

HS-PS1-A-3

Organize the following bonds as ionic or covalent.

Groups:

(a) Covalent

,

(b) Ionic

• K–Cl

• P-H

• Ti–O

• O–Mg

• H-C

• N–N

Answer explanation

Vocab from quizlet

Covalent compounds are between nonmetals and nonmetals.

Ionic compounds are between metals and nonmetals.

Tags

HS-PS1-A-3

Organize the following bonds as polar or non-polar.

Groups:

(a) Polar

,

(b) Non-Polar

• S–H

• C–O

• Cl–Br

• C–H

• H–H

• H–F

Answer explanation

Look at differences in electronegativities. The closer on the periodic table they are the more nonpolar they are, the further away the more polar.

C-H bonds are nonpolar.

Tags

HS-PS1-A-3

Match the following elements with the correct number of valence electrons.

• 3

• P

• 1

• Sr

• 4

• C

• 2

• H

• 5

• Al

Answer explanation

Find the group/column they belong in and look at the top number. Skip groups 3-12, the d block gets weird.

Tags

HS-PS1-A-2

Match the following elements with the correct number of valence electrons.

• 6

• Ar

• 4

• O

• 5

• N

• 7

• Si

• 8

• I

Answer explanation

Find the group/column they belong in and look at the top number. Skip groups 3-12, the d block gets weird.

Tags

HS-PS1-A-2

Organize the following ions into cations and anions.

Groups:

(a) Cations (+)

,

(b) Anions (-)

• Fluoride

• Aluminum

• Lithium

• Magnesium

• Calcium

• Potassium

• Chloride

• Sulfide

• Nitride

• Bromide

Answer explanation

Metals lose electrons and gain a positive charge.

Nonmetals gain electrons and gain a negative charge.

Tags

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HS-PS1-A-2

Organize the following ions based on their charge

Groups:

(a) +1

,

(b) Multiple +

,

(c) -1

,

(d) Multiple –

• Iodide

• Aluminum

• Bromide

• Copper II

• Calcium

• Sodium

• Phosphide

• Oxide

• Chloride

• Silver I

• Potassium

Answer explanation

Group I metals and Transition metals with I have +1

Group II metals and Transition metals with II have +2

Halogens (group 17) and some poly ions have -1 charge

Group 15, 16, and some polyatomic have multiple negative charges.

Tags

HS-PS1-A-3

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Select all correct combinations of monoatomic ionic formulas.

• LiF

• K2Br

• Al3F

• CaO2

Answer explanation

Li is +1 and F is -1. This is is a 1:1 charge ration and symbols are written

Tags

HS-PS1-A-4

Select all correct combinations of monoatomic ionic formulas.

• Na2Br

• MgCl

• Al2O3

• SrS

Answer explanation

Aluminum is a +3 charge and Oxygen is a -2. Least common multiple is 6 so we will need 2 Al at a +6 over all to cancel out 3 Os with a -6 over all charge.

Tags

HS-PS1-A-4