Describing Matter

Which of the following is a mixture containing a compound and an element?

• A

• B

• C

• B and C

Which of the following is a pure substance?

• D

• E

• F

• D and E

• D and F

Which of the following is a mixture of elements?

• G

• H

• I

• H and I

Match the following on what physical property you would use to separate the mixture.

• Boiling Point

• Iron and Sulfur

• Density

• Salt water

• Size of particle

• Rocks and Sand

• Magnetism

• Oil and Water

• Solubility

• Sand and Salt

Avogadro's Hypothesis states that...

• All elements will bond in small whole number ratios

• Homogeneous Mixtures will be the same throughout

• Gasses at equal temperature, pressure and volume will have equal particles

• Every compound will contain the same percent composition regardless of sample

What is the proper formula for both chlorine and Hydrogen?

• Cl and H

• Cl₂ and H₂

• Cl and H₂

• Cl₂ and H

What is the formula for both compounds if the masses of Arsenic and Oxygen are proportional to compound B?

• A: As₂O

  B: AsO

• A: AsO₂

  B: AsO

• A: As₃O

  B: As₂O

• A: As₂O

  B: AsO₂

A chemical analysis is performed on a 200.0 g sample of the compound methyl butanoate, a compound which smells like apples. Analysis shows this sample contains 117.6 g of carbon, 19.6 g of hydrogen, and 62.8 g of oxygen.  Determine the percent composition by mass of each element in the sample of methyl butanoate.

• 17 % C

  10.2 % H

  31.8 % O

• 48.2 % C

  10.9 % H

  40.9 % O

• 58.8 % C

  10.8 % H

  30.4 % O

• 58.8 % C

  9.8 % H

  31.4 % O

A chemical analysis is performed on a 200.0 g sample of the compound methyl butanoate, a compound which smells like apples. Analysis shows this sample contains 117.6 g of carbon, 19.6 g of hydrogen, and 62.8 g of oxygen.  A 50.0 g sample of the same compound shows that sample contains 29.4 g of carbon, 4.90 g of hydrogen and 15.7 g of oxygen.  Determine if these two samples are the same compound.

• They are the exact same compound.

• They are different compounds.

• The Law of Multiple Proportions states that they must be the same.

Two compounds made of Lead and Chlorine are as such:  Compound I is broken apart and is composed of 58.4 g Lead and 40.0 grams of Chlorine.  Compound II is composed of 146.0 g Lead and 50.0 g of Chlorine.  Based on the hypothesis that Lead is 5.85 times larger than Chlorine determine the formula of both compounds.

• Compound I: Pb₁Cl₂

  Compound II: Pb₁Cl₁

• Compound I: Pb₁Cl₃

  Compound II: Pb₁Cl₂

• Compound I: Pb₁Cl₄

  Compound II: Pb₁Cl₂

• Compound I: Pb₃Cl₁

  Compound II: Pb₂Cl₁