1,698 Answered Questions for the topic biochemistry

10/06/20

Calculate the energy required to heat 701.0mg of silver from −0.8°C to 8.9°C.

Calculate the energy required to heat 701.0mg of silver from −0.8°C to 8.9°C. Assume the specific heat capacity of silver under these conditions is ·0.235J·g−1K−1.Be sure your answer has the... more
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10/06/20

What can the chemist report for the specific heat capacity of the substance?
Hello, I'm so confused on this question, can I please have a detailed explanation?A chemist carefully measures the amount of heat needed to raise the temperature of a 261.0mg sample of a pure... more
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10/06/20

What can the chemist report for the specific heat capacity of the substance?

A chemist carefully measures the amount of heat needed to raise the temperature of a 261.0mg sample of a pure substance from 2.8°C to 19.5°C. The experiment shows that 0.606J of heat are needed.... more
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10/06/20

What can the chemist report for the specific heat capacity of the substance?
A chemist carefully measures the amount of heat needed to raise the temperature of a 754.0g sample of a pure substance from 2.1°C to 20.2°C. The experiment shows that 9.69kJ of heat are... more
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10/06/20

What can the chemist report for the specific heat capacity of the substance?
A chemist carefully measures the amount of heat needed to raise the temperature of a 442.0mgsample of a pure substance from 52.4°C to 66.4°C. The experiment shows that 25.9J of heat are needed.What... more
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10/05/20

URGENT!!! What can the chemist report for the specific heat capacity of the substance?

A chemist carefully measures the amount of heat needed to raise the temperature of a 697.0g sample of a pure substance from 59.9°C to 67.2°C. The experiment shows that 21.kJ of heat are needed.... more
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10/01/20

Urgent: Calculate the minimum mass of hydrobromic acid that could be left over by the chemical reaction.

Aqueous hydrobromic acid HBr will react with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O.Suppose 45. g of hydrobromic acid is mixed with 16.6 g of sodium... more
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09/30/20

Calculate the largest amount of H2O that could be produced.
Hydrogen (H2) gas and oxygen (O2) gas react to form water H2O vapor. Suppose you have 1.0 mol of H2 and 5.0 mol of O2 in a reactor.Calculate the largest amount of H2O that could be produced.Round... more
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09/29/20

What is the density of the iron nugget?
An iron nugget weighing 8.14 g was placed in a graduated cylinder and 25.1 cm3 of water was added to the cylinder. The total volume after adding the water was 26.2 cm3.What is the density of the... more
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09/29/20

Which is more stable, cis or trans?
Which is more stable out of these stereoisomers?(a) cis-1,2-dimethylcyclopentane(b) trans-1,2-dimethylcyclopentane
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09/29/20

Hydrogen (H2) gas and oxygen (O2) gas react to form water (H2O) vapor. 
Hydrogen (H2) gas and oxygen (O2) gas react to form water (H2O) vapor. Suppose you have 5.0 mol of (H2) and 11.0 mol of (O2) in a reactor.Suppose as much as possible of the H2 reacts. How much will... more
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09/28/20

(CHEMISTRY) Wedge/Dash Structures help!
I'm not sure of the wedge and dash structures for fromaldehyde, sulfite ion, and boron trichloride. I can't seem to find any information about it :(Thank you for your help!
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09/28/20

Calculate the largest amount of CO2 that could be produced.

Methane (CH4) gas and oxygen (O2) gas react to form carbon dioxide (CO2) gas and water (H2O) vapor. Suppose you have 9.0 mol of (CH4) and 3.0 mol of (O2) in a reactor.Calculate the largest amount... more
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09/28/20

What mass of oxygen gas is produced by the reaction of 4.09g of carbon dioxide?

Green plants use light from the Sun to drive photosynthesis. Photosynthesis is a chemical reaction in which water H2O and carbon dioxide CO2 chemically react to form the simple sugar... more
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09/28/20

What mass of octane is consumed by the reaction of 4.0 of oxygen gas?
A major component of gasoline is octane C8H18 When octane is burned in air, it chemically reacts with oxygen gas O2 to produce carbon dioxide CO2 and water H2O.What mass of octane is consumed by... more
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09/28/20

How many mL of 1.00 M sulfuric acid are required to neutralize 25.0 mL of 4.00 M NaOH?

How many mL of 1.00 M sulfuric acid are required to neutralize 25.0 mL of 4.00 M NaOH?(start by writing the balanced equation for this acid-base reaction)
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09/28/20

What is the percent yield of sodium sulfate (142.04 g/mol) from this reaction?
Consider the reaction of 32.18 g of sulfuric acid (98.08 g/mol) with excess sodium hydroxide to produce 37.91 g of sodium sulfate. What is the percent yield of sodium sulfate (142.04 g/mol) from... more
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09/28/20

Consider the reaction:
Consider the reaction i. Which is the limiting reactant if we start with 114 g of Al (26.98 g/mol) and 186 g of (70.9 g/mol)?ii. How much  (133.34 g/mol) can be made at most from these amounts of... more
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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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