1,708 Answered Questions for the topic biochemistry

09/28/20

Determine the mass of water that will be obtained from combustion of 200.g of propane.
Consider the combustion of propane (44.1 g/mol) in the presence of excess oxygen.Determine the mass of water that will be obtained from combustion of 200.g of propane.C3H8 + 5O2 = 4H2O + 3CO2
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Biochemistry Biology Microbiology

09/28/20

Antibiotic sensitivity table
Hi!Is the table in Bio Libres page on Kirby Bauer for all types of bacteria when it is not specified like Ampicillin (Staph)?Link will be posted in comment below.Thanks!
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Biochemistry Biology Microbiology

09/25/20

Kirby Bauer Test
Hi!What are some error sources for the Kirby Bauer test for antibiotic sensitivity?Thanks!
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Biochemistry Biology Microbiology

09/25/20

Antibiotic Resistance Reference
Hi!Can someone please give me a link to a table where I can find reference value for when the inhibition zone length is counted as resistant or susceptible for E.coli and Tetracycline 10 mikrograms?
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Biochemistry Biology Microbiology

09/24/20

E. coli antibiotic
Hi!I wonder if Streptomycin is effective for E.coli infections?Some sources say yes, others say that it enhances its growth.Which one is true?Thanks!
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Biochemistry Biology Microbiology

09/24/20

Inhibition zone
Hi!I did a Kirby-Bauer lab seeing antibiotic resistance in E.coli. I have measured the inhibition zones, but I am not sure how to confirm if it is large enough to be considered not resistant or... more
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Biochemistry

09/22/20

At a pH of 7.2, which compound A or B would have better affinity for the active site?

Fully detailed Question:You notice that in the active site of the esterase there is a Phe. At a pH of 7.2, which compound A or B would have better affinity for the active site? Explain your answer... more
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09/21/20

When 1 g of a salt is dissolved in 50.0 g of water, the temperature increases by 2.5ºC. Which of the following changes will cause the temperature to increase by about 5ºC?
When 1 g of a salt is dissolved in 50.0 g of water, the temperature increases by 2.5ºC. Which of the following changes will cause the temperature to increase by about 5ºC?a. Doubling the amount of... more
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09/21/20

need help with a homework problem, very advanced
Guanine is an essential component of DNA. It contains the elements carbon, hydrogen,nitrogen and oxygen. When 615 mg of guanine is burned, 895 mg of carbon dioxide and 183 mgof water are formed. In... more
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09/21/20

why do you assume 100 g of a substance when given percentages?
when given a problem and the elements of a compound are given in percentages, i don't understand why you can just assume that it's 100g of the compound. why couldn't it be 200g or 700g of the... more
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09/20/20

When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC.
When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC.What is the enthalpy of solution of ammonium nitrate? Given, specific heat of solution... more
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09/20/20

Given the following salts and the corresponding enthalpy, predict whether the temperature will decrease or increase when the salt dissolves in water.
Given the following salts and the corresponding enthalpy, predict whether the temperature will decrease or increase when the salt dissolves in water.Ammonium Chloride (ΔHsol = +14.7 kJ/mol)
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09/20/20

Calculate the amount of salt in a commercial cold-pack containing ammonium nitrate (ΔHsol = + 25.7 kJ/mol) if the final temperature of the cold-pack is 0ºC.
Calculate the amount of salt in a commercial cold-pack containing ammonium nitrate (ΔHsol = + 25.7 kJ/mol) if the final temperature of the cold-pack is 0ºC. Assume that the initial temperature of... more
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09/20/20

When 1 g of a salt is dissolved in 50.0 g of water, the temperature increases by 2.5ºC. Which of the following changes will cause the temperature to increase by about 5ºC?
When 1 g of a salt is dissolved in 50.0 g of water, the temperature increases by 2.5ºC. Which of the following changes will cause the temperature to increase by about 5ºC?a. Doubling the amount of... more
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09/20/20

When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC.

When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC. What is the enthalpy of solution of ammonium nitrate? Given, specific heat of solution... more
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09/20/20

What is the amount of ammonia (17.03 g/mol) that can be obtained by complete reaction of 35 g of nitrogen gas (28.01 g/mol) with excess hydrogen gas
What is the amount of ammonia (17.03 g/mol) that can be obtained by complete reaction of 35 g of nitrogen gas (28.01 g/mol) with excess hydrogen gasaccording to the balanced equation:N2 + 3H2 = 2NH3
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09/20/20

What is the concentration expressed in ppm of a solution containing 0.036 g of sodium chloride (58.44g/mol) in 0.500 Liters of solution ? Assume the density of the solution to be 1.00g/mL.
What is the concentration expressed in ppm of a solution containing 0.036 g of sodium chloride (58.44g/mol) in 0.500 Liters of solution ? Assume the density of the solution to be 1.00g/mL.
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09/20/20

What volume of a 0.500 M solution of sucrose (342.3 g/mol) contains 22.4 g of sucrose?
What volume of a 0.500 M solution of sucrose (342.3 g/mol) contains 22.4 g of sucrose?
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09/20/20

What is the molarity (M)of a sodium chloride solution prepared by dissolving 20.0 g of sodium chloride (58.44g/mol) in water to give 45 mL of solution?
What is the molarity (M)of a sodium chloride solution prepared by dissolving 20.0 g of sodium chloride (58.44g/mol) in water to give 45 mL of solution?
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Biochemistry Math Science Calculus

09/18/20

Write the prefix and unit that is represented by each of the following sets of symbols
1.Write the prefix and unit that is represented by each of the following sets of symbols -mm-pL-dL-µs-km-m-ng2.Write the symbols that represent each combination of prefix and... more
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Biochemistry Math Science Chemistry

09/18/20

Write which prefix is associated with the following place values:
Write which prefix is associated with the following place values:-The hundreds place-The millions place-The tenths place-The hundredths place-The billionths place-The billions place-The thousandths... more
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09/18/20

Write the symbols that represent each prefix.
Write the symbols that represent each prefix.-Deca-Pico-Hecto-Milli-Kilo-Mega-Micro-Centi
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09/17/20

Calculate the mass of ammonia NH3 that contains a million 1.0 x 10^6 hydrogen atoms.
Calculate the mass of ammonia NH3 that contains a million 1.0 x 10^6 hydrogen atoms.Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits.
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09/17/20

Calculate the mass of glucose C6H12O6 that contains a trillion 1.000 x 10^12 carbon atoms.
Calculate the mass of glucose C6H12O6 that contains a trillion 1.000 x 10^12 carbon atoms.Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.
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09/17/20

Calculate the number of hydrogen atoms in a 100.0 g sample of tetraborane (B4H10)
Calculate the number of hydrogen atoms in a 100.0 g sample of tetraborane (B4H10).Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.
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