Final Review

Which of the following is a homogeneous mixture ?

• Iron

• oil and water

• water

• salt water

How many electrons does the sodium ion (Na⁺ ) have?

• 11

• 12

• 10

• 23

Which inter-molecular forces are found in carbon monoxide, CO? 

• London dispersion

• dipole-dipole

• H-bonding

Answer explanation

LDfs because it has electrons

and dipole-dipole because CO is polar.

What is the name of SF₅?

• hexasulfur fluoride

• sulfur(V) fluoride

• sulfur hexafluoride

• sulfur pentafluoride

Which compound listed below is nonpolar?

draw the Lewis structures

• NaCl

• CS₂

• NH₃

• None of these

How many calories are required to heat 41.1 g of copper from 23.0°C to 28.6°C?

• 5.06

• 21

• 230

• 965

Answer explanation

When temperature increases, use q=mcT and c = 0.092cal/gC from the formula sheet

Which of the following atoms has the smallest radius?

• Be

• Li

• N

• F

Answer explanation

As you move across a period the atoms get smaller.

What is the name of N₂O₅?

• nitrogen(V) oxide

• nitrogen oxide

• nitrogen pentoxide

• dinitrogen pentoxide

Answer explanation

Follow the naming rules for nonmetals

How many mg in 6 .173 kg?

• 6.173 x 10^-6 mg

• 6.173 x 10 ^-3 mg

• 6.173 x 10⁶ mg

• 6.173  x 10 ³ mg

What is the mass percent of copper in CuCl₂?

• 66.7 %

• 52.7 %

• 47.3 %

• 26.4 %

Answer explanation

mass Cu/ mass CuCl₂ x 100