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Tenth Grade (Grade 10) Molecules and Compounds Questions

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Grade 10 Molecules and Compounds
What is the formula for Sulfuric Acid?
  1. HSO4
  2. H4(SO4)3
  3. H2SO3
  4. H2SO4
Grade 10 Molecules and Compounds
Which of the following is a polar molecule?
  1. CH4
  2. Xe
  3. H2O
  4. CO2
Grade 10 Molecules and Compounds
As a scuba diving air tank is filled with air, the air is compressed in the tank to as much as 3000 psi of pressure. When filling the tank, it is observed that the tank becomes warmer. Which argument BEST explains why this occurs?
  1. When air is put into the tank, it expands rapidly, thereby raising the temperature.
  2. When air is compressed, it turns solid. A short time later, the air evaporates back into a gas which releases heat.
  3. Air molecules are free to move and as more air is added to the tank, the molecules move and collide faster which raises the temperature.
  4. When air is compressed, the molecules line up into a crystalline structure. As the molecules line up, they release energy in the form of heat.
Grade 10 Molecules and Compounds
Which of the following is a compound?
  1. NaCl
  2. H2
  3. H2 + O → H2O
  4. None of the above
Grade 10 Molecules and Compounds
Which formula represents a nonpolar molecule?
  1. HBr
  2. H2S
  3. CBr4
  4. PCl3
Grade 10 Molecules and Compounds
Ms. Curtis drops her water bottle (again). She asks you to clean it up for her because she is feeling lazy. You take a paper towel and place it onto the water. Instantly the water spreads across the entire paper towel, even though you didn't wipe it! Which of the following statements most accurately describes this scenario?
  1. The paper towel is polar, and thus absorbs the water via adhesion.
  2. The paper towel is nonpolar, and thus absorbs the water via adhesion.
  3. The paper towel is polar, and thus absorbs the water via cohesion.
  4. The paper towel is nonpolar, and thus absorbs the water via cohesion.
Grade 10 Molecules and Compounds
The oxidation number of oxygen in the compound CaO is
  1. +3.
  2. 0.
  3. -1.
  4. -2.
Grade 10 Molecules and Compounds
What is the formula for Copper(II) Nitrate?
  1. Cu2(NO3)
  2. Cu(NO3)2
  3. Cu3N2
  4. CuN
Grade 10 Molecules and Compounds
What is the formula for Tin (IV) Oxide?
  1. SnO2
  2. SnO3
  3. Sn2O4
  4. SnO4
Grade 10 Molecules and Compounds
What compound makes up about 70 percent of Earth's surface?
  1. Water
  2. Carbon Dioxide
  3. Chloride gas
  4. NaCl
Grade 10 Molecules and Compounds
When zinc and oxygen chemically unite, they form
  1. a gas.
  2. an ion.
  3. a mixture.
  4. a compound.
Grade 10 Molecules and Compounds
Measurement of molar volumes of various gases show that the molar volume                                              .
  1. tends to decrease with increasing molar mass.
  2. tends to increase with increasing molar mass.
  3. is totally independent of molar mass.
  4. is proportional to the molar mass.
Grade 10 Molecules and Compounds
Which of the following describes the charge distribution and molecular polarity of NH3?
  1. even distribution and polar
  2. uneven distribution and nonpolar
  3. uneven distribution and polar
  4. even distribution and nonpolar
Grade 10 Molecules and Compounds
What is the formula for Platinum (II) Nitride?
  1. Pt2N3
  2. (PtN)6
  3. Pt3N2
  4. Pt5N2
Grade 10 Molecules and Compounds
The oxidation number of sulfur in H2SO4 is
  1. -2.
  2. 0.
  3. +6.
  4. +3.
Grade 10 Molecules and Compounds
Which phrase correctly describes the distribution of charge and the molecular polarity of ethane?
  1. symmetrical and polar
  2. asymmetrical and polar
  3. asymmetrical and nonpolar
  4. symmetrical and nonpolar
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