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Chemistry
Tamara
Be sure to use proper significant figures for all remaining problems. how many grams of nacl are present in 350 ml of 0.020 m nacl solution? (remember that 1 mole nacl = 58.44 g/mole.)
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Chemistry
Kelsey
If two elements are from the
same period, which element is most
likely to have the largest atomic
radius, the element from Group 13
or the element from Group 17?
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Chemistry
Cooper Atkinson
Base your answer to the question on the information below and on your knowledge of chemistry. At 1023 K and 1 atm, a 3.00-gram sample of SnO2 (s) (gram formula mass = 151 g/mol) reacts with hydrogen gas to produce tin and water, as shown in the balanced equation below. SnO2 (s) + 2H2 (g) → Sn (L) + 2H2O (g) Show a numerical setup for calculating the number of moles of SnO2 (s) in the 3.00-gram sample.
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Chemistry
Jairo Herrera
Explain why the quantum number set (2, 2, - 1, - ½) is not possible for an electron in an atom.
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Chemistry
Makai Guerrero
Which term names the group of organisms able to interbreed and produce fertile offspring?
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Chemistry
Nikolai Ritter
Though alchemy was not a part of seven liberal arts curriculum in per-modern Europe education, alchemical experiments caused important developments in metallurgy, porcelain production, textile industry, etc. Explain the major achievements in alchemy and chemical experiment
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Chemistry
Sutton
In the lab you find four bags; each contains 5.00 g of a different gas at STP. The gases are O2, CH4, CO2, and He. Which bag has the largest volume?
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Chemistry
Andres Weber
The carbon dioxide exhaled by astronauts can be removed from a spacecraft by reacting it with lithium hydroxide (LiOH). The reaction is as follows: CO2 (g) + 2LiOH (s) Li2CO3 (s) + H2O (l). An average person exhales about 20 moles of CO2 per day. How many moles of LiOH would be required to maintain two astronauts in a spacecraft for three days?
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Chemistry
Romeo Whitaker
The bcc unit cell of a substitutional alloy has atoms of element A at the corners of the unit cell and an atom of element B at the center of the unit cell. Write the formulas in terms of A and B. List element A first for both answers. 1. What is the formula of the alloy? 2. What would the formula of the alloy be if the positions of the two elements were reversed in the unit cell?
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Chemistry
Isiah York
A rock that contains enough of a p a r t i c u l a substance to make it worth mining is called a
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Chemistry
Baldwin
If you add 10mL of hot water to 10mL of cold water and the change in tempature 8°C calculate how much energy is gained by the cold water
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Chemistry
Krueger
Gasoline (which can be considered to be octane, C8H18) burns in oxygen to produce carbon dioxide and water. What volume (L) of oxygen at STP is necessary to react with 1.0 gal of gasoline? (The density of gasoline is 0.81 g/mL. 1 gal = 3.78 L)
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Chemistry
Zachery Benton
20cm³ of sulphuric acid reacts completely with excess zinc to form 0.1 mole of hydrogen gas. Calculate the molarity of the acid used.
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Chemistry
Guest
Which scientist developed the quantum mechanical model of the atom?
a. Albert Einstein
c. Niels Bohr
b. Erwin Schrodinger
d. Ernest Rutherford
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Chemistry
Allie Crawford
Which planet has Charon as its moon?
A. Mercury
B. Pluto
C. Mars
D. Saturn
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