Chemistry H Midterm

Intro to Chem

100

2,700,000 in scientific notation.

2.7 x 10^6

200

The statement "The total mass of materials is not affected by a chemical change in those materials" is called a(n)...

observation / measurement / theory / natural law / experiment

Natural law

300

In a laboratory exercise to determine the volume of a mole of a gas at STP, a student determines the volume to be 2.25 liters greater than the accepted value. The percent error in the student's value is...

10.0%

400

Convert 35 mi/hr into ft/sec

51 ft/sec

500

Convert 0.0494ft^3 to L. (1 L = 1 dm^3)

1.40 L

Matter

100

A homogeneous mixture has how many phases of matter?

One

200

Which compound when stirred in water will not pass through filter paper?

NaCl, NH4S, Mg(OH)2, LiCl

Mg(OH)2

300

In 200g of H2O, how many grams of NaNO3 will precipitate out of the solution if the temperature decreases from 40 to 10 degrees Celsius?

approximately 50g NaNO3

400

Increasing the temperature of a gas (increases/decreases) the rate of dissolving.

In gases, increasing the pressure (increases/decreases) the rate of dissolving.

decreases, increases

500

Solubility and molecular polarity are two physical properties of a mixture required to use which separation technique?

Chromatography

Energy

100

List the liquids in order of weakest to strongest intermolecular forces: ethanol, water, ethanoic acid, propanone

propanone, ethanol, water, ethanoic acid

200

The melting point curve of water's triple point diagram has a (positive/negative) slope?

negative

300

Order aqueous, solid, liquid, and gas in order of increasing entropy.

solid - liquid - aqueous - gas

400

What effect does an increase in temperature have on viscosity?

Decrease in viscosity

500

How much heat is released when 8.50 grams of water at 150 degrees Celsius is cooled to ice at -22.0 degrees Celsius? Express your answer in kilojoules.

28.2 kilojoules

States of Matter

100

Amorphous solids are (isotropic/anisotropic) in nature

isotropic

200

True or false: Boiling is a surface phenomenon.

False, evaporation is a surface phenomenon.

300

There are ? types of crystal systems. There are ? types of unit cell.

7, 3

400

Which of the following is not a network solid? C, SiC, SiO₂, HCl

HCl

500

Solids with this property will become liquids after absorbing water from the atmosphere.

Deliquescence

Atomic Structure and Bonding

100

What is the abbreviated electron configuration of calcium?

[Ar] 4s²

200

As you move across a period, Zeff increases while shielding (increases/decreases/remains constant).

Constant

300

True or False: The Pauli Exclusion Principle states that there will be a maximum of 2 electrons per orbital and that the electrons will have opposite spins.

True

400

Find the molar mass of and name the following chemical compound: (NH₄)₃PO₄

Ammonium phosphate 149 g/mol

500

Calculate the average atomic mass of silicon considering the following information: Silicon-28=92.23%=27.97693amu / Silicon-29=4.68%=28.97649amu / Silicon-30=3.09%=29.97377amu

28.1amu