- Slides: 30
Worksheet: Elements, Compounds, and Mixtures
1. Which of the bottles pictured above contain matter? • All the bottles contain matter.
2. Which of the bottles contain a single pure substance? • Bottles (a) and (b).
3. Explain your answer to question #2. • Pure substances include elements and compounds.
4. How many elements are present in each molecule of water? • Two.
5. What is the ratio of hydrogen atoms to oxygen atoms in a water molecule? • Two hydrogens for each oxygen.
6. As you know, ice is frozen water. What would you expect the ratio of hydrogen atoms to oxygen atoms to be in a molecule of ice? • Two hydrogens for each oxygen. 7. Explain your answer to question #6 • Ice and water are the same substance (H 2 O)
8. Bottles (c) and (d) both contain mixtures. How are these mixtures similar? • They are both mixtures of hydrogen and oxygen.
9. Bottles (c) and (d) both contain mixtures. How are these mixtures different ? • The amounts of hydrogen and oxygen vary.
10. How can we prove that saltwater is a mixture? • By separating it into salt and water through physical means. Or • By having samples of saltwater that vary in the ratio of salt and water.
11 a. Rice Pudding
a. Rice Pudding Heterogeneous mixture
b. Copper Element
c. Propane C 3 H 8 compound
d. Air Homogeneous Mixture (Solution)
e. Magnesium Chloride
e. Magnesium Chloride Mg. Cl 2 compound
f. Mercury Element
g. Maple Syrup
g. Maple Syrup Homogeneous Mixture (Solution)
h. Baking Soda
h. Baking Soda Na. HCO 3 compound
i. Chex Party Mix
i. Chex Party Mix Heterogeneous mixture
j. White Gold
j. White Gold An alloy of gold and a white metal such as nickel or palladium Homogeneous Mixture (Solution)