Exam 2 Review

Scientific Notation

100

Which of the following have 3 sig figs? select all that apply

A.0.0234

B. 1.0234

C. 79300

D. 501

A. 0.0234

C. 79300

D. 501

200

In multiplication or division, the final answer is written so that it has the same number of significant figures (SFs) as the measurement with the ___ significant figures.

Fewest

300

Solve with correct # significant figures: 

24.66 cm x 0.35 cm

= 8.631 (calculator display)

Significant Figures: 8.6 cm²

400

In addition or subtraction, the final answer is written so that it has the same number of decimal places as the measurement with the ___ ___ ___.

Fewest decimal places

500

Add the following measured numbers:

2.012+61.09+3.0

66.1

Metric & SI prefixes

100

Identify the larger unit & what is the relationship in each of the following:

A. second or millisecond

A. second

1 s= 10³ ms

200

Convert 25 ms to s

1 s=1000 ms

0.025 s

300

If a person weighs 164 lb, what is their body mass in kilograms?

74.5 kg

400

Convert 4.00 lb to g

1 kg= 2.20 lb

1.82x10³ g

500

A doctor’s order prescribed a dosage of 0.150 mg of a drug. If a tablet contains 75 μg of the drug, how many tablets are required to provide the prescribed medication?

1 g= 10³ mg

1 g= 10⁶ μg

0.150x (1g/10³ mg)x(10⁶ μg/1g)x(1 tablet/75 μg)=

2.0 tablets

Ions

100

Metals ___ electrons & Nonmetals ___ electrons

Lose, Gain

200

Valence electrons of a metal atom are transferred
to the atom of a nonmetal

Ionic Bonds or Covalent Bonds

Ionic

300

Given the atomic symbol, determine the number of protons, neutrons, and electrons in the following ion:

⁵⁵Co³⁺

Protons: 27
Neutrons: 28
Electrons: 24

400

What is the ionic formula of the compound formed between calcium and bromine?

A. Ca₂Br₂
B. Ca₂Br
C. CaBr
D. Ca₇Br₂
E. CaBr₂

E. CaBr₂

500

Write the formula for the ionic compound: iron(III) oxide.

Fe₂O₃

More from Chp. 6

100

The ___ of an atom is its ability to attract the shared electrons in a bond

Electronegativity (EN)

200

What are the ∆EN ranges for nonpolar covalent, polar covalent, ionic

Nonpolar: 0-0.4

Polar: 0.5-1.8

Ionic: greater than 1.8

300

Which of the following bonds are polar covalent? Choose all that apply

P-Cl
Na-O
Br-Br
I-O

P-Cl

I-O

400

The separation of charges in a polar bond
is called a ___.

Dipole

500

What are the 3 exceptions to the Octet Rule

•Hydrogen requires just 2 electrons to
form a noble gas arrangement.
• Boron (B) requires just 6 electrons
and therefore only makes three
bonds.
• Beryllium (Be) requires just 4
electrons and therefore only makes
two bonds.

Misc.

100

___ compares the mass of an object to its volume

Density

200

Valence electrons of nonmetal atoms are
shared to attain a noble gas configuration -> molecular compound

Ionic Bonds or Covalent Bonds

Covalent Bonds

300

T/F: The polar bonds in the molecule do not cancel each other

True

400

Write the formula and the symbol of an ion with 16 protons and 18 electrons.

A. S²⁺
B. Ar
C. Ar²⁺
D. S^2-

D. S^2-

500

What are the three characteristics/properties(?) of Ionic Bonds 

• Occurs between metal and nonmetal ions
• Results from electron transfer
• Electronegativity of 1.9 or more