Matter

All the following are characteristic properties of phosphorus. Which one is a chemical
property?

• Both red phosphorus and white phosphorus exist in solid forms.
• When exposed to air, white phosphorus will
  burn spontaneously, but red phosphorus
  will not.
• The red form melts at about 600°C and the
  white form melts at 44°C.
• The white form will dissolve in liquid carbon
  disulfide, but will not dissolve in water.

The measurement 0.0374 g, rounded off to two significant figures, would be

• 0.037 g
• 0.038 g
• 0.04 g
• 0.040 g

Which of the following are extensive
properties?
I. Color
II. Conductivity
III. Density
IV. Mass
V. Volume

• I, II, III
• III, IV, V
• IV, V
• I, III

Water freezes at 0°C at sea level. How would you classify this property?

• intensive property and physical property
• intensive property and chemical property
• extensive property and chemical property
• extensive property and physical property

Which of the following is heterogeneous mixture?

• A
• B
• C
• D

Which of the following is NOT a way to separate a mixture?

• Filtration
• Distillation
• Chromatography
• Chemical Bonding

Samples of the air we breathe that were taken from different parts of the world have all been
found to contain about 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and
0.07% other gases. Based on this analysis, which is the correct classification for air?

• element
• mixture
• compound
• atom

Identify the line segment on the curve where the average kinetic energy of the particles of NaCl
is increasing.

• D - E
• C - B
• B - C
• A - B

According to the law of conservation of mass, how much zinc was present in the zinc carbonate?

• 40 g
• 88 g
• 104 g
• 256 g

A mixture of iron and sulfur can be separated by attracting the iron particles with a magnet. If the iron
and sulfur mixture is heated strongly, iron (II) sulfide (FeS) forms, which is no longer magnetic and
cannot be separated by physical methods. What is iron (II) sulfide (FeS)?

• element
• compound
• homogeneous mixture
• heterogeneous mixture