Name: _____________________________________ HOMEWORK Week of October 28, 2013
Answer the following questions using the Periodic Table of the Elements
1. How many protons does tungsten have?
2. What is the atomic mass of cadmium?
3. What is the atomic symbol of terbium?
4. How many neutrons does lead have?
5. What element’s symbol is Am?
6. What element has 51 protons?
7. What element has an atomic mass of 74.92u?
8. What element has a symbol of Au?
9. How many neutrons does antimony have?
10. What is the atomic number of rubidium?
11. What element has 93 protons?
12. How many neutrons does bohrium have?
13. How many protons does radon have?
Period: ________________
Correct the grammar and spelling errors in the following passage about Joseph Priestly (England, 1733-1804).
Hint: There are 10 errors in this passage (phlogiston and dephlogisticated are NOT misspelled).
Do you like the way soda fizzes and bubbles? If so, then you can thank Joseph Priestly. In 1767, Priestly moved next door to a brewery, a factory
where beer is made. The process of making beer produces carbon dioxide gas. Priestly was curious about the properties of carbon dioxide, so he
worked out an arrangement with the brewery owners that gave him a regular supply of the gas. Through many different experiments, he
demonstrated that animals produce carbon dioxide and plants absorb it. This movement of gas between plants and animals gave scientists tgeur
first glimpse of the vast process now called the carbon cycle.
Also important was Priestly’s discovery in 1774 of a gas that, in pure form, made fires burn hot and bright and caused mice to become frisky and
active. His experiments showed that plants made the gas and animals needed it to survive – just the opposite of carbon dioxide. Priestly called
the pure gas “dephlogisticated air,” after a common idea that substances contained a substance called “phlogiston” that made fire possible. By
burning materials in a closed container of the pure gas, Priestly drew to conclusions. First, he thought that fire burned strongly in the gas
because the phlogiston in burning materials rushed out to fill the lack of phlogiston in the gas. Second, he thought that fire in a closed container
stopped burning because the gas eventually filled up wuth phlogiston, leaving nowhere for the phlogiston left in the materials too go.
Priestly’s ideas about “dephlogisticated” gas were wrong. Their is no substance called phlogiston that makes fire possible. Instead, fire is the
result of a chemical reaction called combustion, which explosively combines matter with oxygen and releases ebergy as heat and light. A fire in a
closed container stops burning not because the air becomes packed with phlogiston but because the reaction uses up all the oxygen in the
container. So, what Priestly called “dephlogisticated air” was actually pure oxygen. Despite his mistakes, however, scientists still credit Priestly
with discovering oxygen and correctly describing it’s importance to plnats and animals.
So, what is Joseph priestly’s connection to soda? In 1768, Priestly discovered that mixing water with carbon dioxide gas, sugar and herbal
flavorings produced a delicious, refreshing drink. He sold the idea to his friend Jacob Schweppe, who built a business making the drink. That was
the start of the soda industry. Alsmost 250 years later, you can still find Schweppes Tonic Water and Ginger Ale in many grocery stores.