U3: Post Test: Bonding

During a chemistry class, Mr. Powers asked Noah which of the following substances is made up of a coordinate covalent bond. Which one should Noah choose?

• sodium chloride (NaCl)

• ammonia (NH₃)

• chlorine (Cl₂)

• aluminium bromide (AlBr₃)

• carbon monoxide (CO)

During a science class, Mr. Powers asks Noah why metals are used in making cooking pots and electrical wires. Why are metals good conductors of heat and electricity?

• anions rotate around the stationary electrons

• cations rotate around the stationary electrons

• free moving atoms in metals carry both heat and electric current

• free moving electrons in metals carry both heat and electric current

• free moving protons in metals carry both heat and electric current

During chemistry class, Mr. Powers asked Noah to identify the correct Lewis structure for ammonia (NH₃). Note: Hydrogen and nitrogen have one and five valence electrons respectively. Which of the following is the correct Lewis structure?

• figure A

• figure B

• figure C

• figure D

• figure E

Mr. Powers is helping Noah understand the structure of a formaldehyde molecule. The placement of the double bond goes between which two atoms in this formaldehyde molecule? Note: Hydrogen, carbon, and oxygen have one, four, and six valence electrons respectively.

• between the carbon and a hydrogen atom

• between the carbon and the oxygen atom

• between the two hydrogen atoms

• between the oxygen and a hydrogen atom

• between the oxygen and both hydrogen atoms

During a chemistry experiment, Mr. Powers asked Noah to identify the chemical name of the compound Cu2CO3. What is the correct answer?

• Copper (I) Carbonate

• Copper (II) Carbonate

• Copper (III) Carbonate (II)

• Copper (III) Carbonate

• Copper Carbonate

Mr. Powers is teaching his class about chemical compounds. He asks Noah, "What is the formula for the compound iron (III) sulfate?"

• FeSO4

• Fe3(SO4)2

• Fe2(SO4)3

• Fe2(SO2)4

• Fe3(SO4)5

Mr. Powers is teaching Noah about chemical compounds in class. He asks Noah, "What is the formula for the compound dinitrogen pentoxide?"

• N4O5

• N3O4

• N4O6

• N5O2

• N2O5

Mr. Powers is teaching Noah and another student about different types of chemical compounds. He asks, "Which of the following is a binary ionic compound?"

• MgCl2

• C6H12O6

• CO2

• CH4

In Mr. Powers' chemistry class, Noah is drawing the Lewis structure for a chlorine atom. How many valence electrons should Noah show in his drawing?

• four

• five

• six

• seven

• eight

During a chemistry class, Mr. Powers asks Noah and Mr. Humphries to draw an acceptable Lewis structure for a diatomic nitrogen molecule. Which structure should they choose?

• :N≡N:

• N≡N.

• N≡N

• N=N

• N=N: