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Elements and compounds Worksheet
Visit CK12.org for Free Online Practice
1. Atoms are circular in structure with well defined boundaries.
a. TRUE
b. FALSE
2. What is an element?
a. An element is the simplest form of a chemical.
b. An element is a pure substance.
c. An element is an atom.
3. An ion is an electrically charged atom. A hydrogen ion is just a proton. Why?
a. It has gained a proton.
b. It has lost its neutron.
c. It has lost its electron.
d. It has gained an electron.
4. Fill in the blank(s):
A chemical ____________________ is a process that changes some chemical substance into another.
5. Fill in the blank(s):
The number of ____________________ in an atom’s nucleus determine the type of atom.
6. If an electrically neutral atom has 57 protons, how many electrons does it have?
Answer:
2
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You work in a research organization that is looking for markers of various diseases that can be used as a diagnostic for the disease. It has been reported in the past that high levels of Cu are found in the sweat of people with cystic fibrosis. One of the research projects is focused on looking for high levels of Cu in samples that can be obtained non-invasively such as saliva, sweat, hair, nails, etc.
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Many common materials that we ingest, though quite safe in reasonable quantities, become toxic when taken in very large doses. A measure of toxicity is the LD50 value (Lethal Dose, 50%). It is the quantity of material, expressed in mg of material per kg of subject-body-weight that, if administered to a population of subjects, would cause 50% of the population to die. The LD50 value for FD&C Red Dye No. 40 is >10,000 mg/kg in rats. Assume that the LD50 value for humans is the same as for rats.
Calculate the number of mg of Allura Red present in an 9 fluid ounce glass of the beverage you used in this lab and use this calculation to determine the number of such glasses of Allura Red sports drink required to reach the LD50 of 10,000 mg of Allura Red/kg body weight. Assume that the concentration of Allura Red in the beverage is 0.000038 M and the person has a body weight of 175 lbs.
The molar mass of Allura Red is 496.42 grams/mol
1 fl oz = 29.5735 mL
2.205 lbs = 1 kg
You may assume…
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Many common materials that we ingest, though quite safe in reasonable quantities, become toxic when taken in very large doses. A measure of toxicity is the LD50 value (Lethal Dose, 50%). It is the quantity of material, expressed in mg of material per kg of subject-body-weight that, if administered to a population of subjects, would cause 50% of the population to die. The LD50 value for FD&C Red Dye No. 40 is >10,000 mg/kg in rats. Assume that the LD50 value for humans is the same as for rats.
Calculate the number of mg of Allura Red present in an 9 fluid ounce glass of the beverage you used in this lab and use this calculation to determine the number of such glasses of Allura Red sports drink required to reach the LD50 of 10,000 mg of Allura Red/kg body weight. Assume that the concentration of Allura Red in the beverage is 0.000038 M and the person has a body weight of 175 lbs.
The molar mass of Allura Red is 496.42 grams/mol
1 fl oz = 29.5735 mL
2.205 lbs = 1 kg
You may assume…
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CHEMISTRY BENCHMARK TEST 01
CHEMISTRY I 12-7 (AARON JAMES, ID. 12390724)
Plutonium-239 (Pu-239) is a dangerous substance in many ways. Produced in nuclear reactors, it is very poisonous, highly radioactive, and it can
be used to make nuclear bombs. The half-life of Pu-239 is about 24,000 years. How much Pu-239 would remain in a sample with an initial mass of
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Organic Chemistry - Hydrocarbons and Halogenated Hyrdocarbons
Direction: Name the following organic compounds
H.
CH, н
C H
H-
H.
H H
H.
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H HH H
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H.
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3.
H.
CH,H H
HHHH
H C Cc-c-C-C -C-H
H H HHHHH
SOTO
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Air pollution and its causes
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