Shown below are diagrams representing elements or molecules in different states of matter.
1.
Select a container that shows a single element in the gas phase. List all that apply.
2.
Select a container that shows molecules in the gas phase. List all that apply.
3.
Select a container that shows a homogeneous mixture in the solid phase. List all that apply.
4.
Select a container that shows a heterogeneous mixture in the liquid phase. List all that apply.
5.
Select a container that shows a heterogeneous mixture in the solid phase. List all that apply.
6.
Which of the following pairs of diagrams represents a chemical reaction? Circle all that apply. a) 𝑬 → 𝑭 b) 𝑸 → 𝑰 c) 𝑭 → 𝑮 d) 𝑬 → 𝑯 e) 𝑩 → 𝑹
7.
Select a container that shows a homogeneous mixture in the solid and gas phases. List all that apply.
8. Fill in the flow chart from the word bank:
(compound, element, heterogeneous, homogeneous,
matter, pure substance, mixture).
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9.
Which separation technique(s) would be used to separate a mixture of water (b.p. 100°C), cyclohexane (b.p. 97°C), and sand particles? Explain.
10.
Which statements are consistent with Dalton’s atomic theory as it was originally stated? Why? a.
Sulfur and oxygen atoms have the same mass. b.
All cobalt atoms are identical. c.
Potassium and chlorine atoms combine in a 1:1 ratio to form potassium chloride d.
Lead atoms can be converted into gold. e.
An oxygen atom combines with 1.5 hydrogen atoms to form a water molecule.
11.
Describe an alpha particle.
12.
Why did Rutherford assume that the atomic nucleus was positively charged?
13.
Why does the “beam” in Thomson’s experiment bend when a magnet is placed near it?
14.
How does Rutherford’s model of the atom explain why some of the alpha particles directed at the gold foil were deflected straight back toward the source?
15.
List three observations and three conclusions of Rutherford’s Gold Foil Experiment.
16.
What is the electrical charge of an electron as determined by Robert Millikan?
17.
A hydrogen filled balloon was ignited and 1.50 g of hydrogen reacted with 12.0 g of oxygen. How many grams of water vapor formed? What law is this?
18.
Two samples of carbon tetrachloride were decomposed into their elements. One sample produced 38.9 g of carbon and 448 g of chlorine, and the other sample produced 14.8 g of carbon and 134 g of chlorine. Are these results consistent with the law of definite proportions? Explain.
19.
Which of the following are elements and which are compounds? Use E for element and C for compound. a.
sulfur dioxide b.
aluminum c.
sodium hydrogen carbonate
__________
__________
__________ d.
carbon tetrachloride e.
iodine f.
chromium
__________
__________
__________
8. From the symbols and formulas given, classify the following substances as elements or compounds: a.
Ni c. NO
2 e. P
4 b.
CaSO
4 d. KI f. Au
2