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3 years ago

Please Help ASAP

Chemistry

2 answers:

madreJ [45]3 years ago

6 0

Answer: c. The specific heat of seawater

Explanation: Specific heat is defined as the amount of heat required to raise the temperature of unit mass of the substance by a given amount.

Concentration of ions is measured by noting the conductivity of the solution.As higher is the conductivity, higher is the concentration of ions.

Concentration of dissolved oxygen is measured by using iodometric titrations in which iodine is involved.

pH is measured by knowing the concentration of hydrogen ions.

german3 years ago

3 0

C - as you are measuring the specific heat capacity.

This measures the temp required to heat 1g of a substance by 1 degrees C

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3 years ago

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3 years ago

Of the following pairs of atoms, which is the more electronegative? Cl or I

Sonbull [250]

Answer:

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8 0

2 years ago

Determine the amino acid sequence of a polypeptide from the following data:

svlad2 [7]

Solution :

1. It is given that when Edman's reagent is used, it releases PTH-Glycin. The degradation of Edmans is used for the amino acids to sequencing of the peptide/protein and is also removes N terminal amino acid and thus gives us the PTH amino acid product.

Therefore, the first amino acid is Glycine.

2. The Carboxypeptidase A releases the C terminal amino acid, and therefore the last amino acid is Phe.

3. The Cyanogen Bromide helps to chop after the Med residue, therefore the sequence is 1 - 2 - 3 or 2 - 1 - 3.

4. The trysin chops after the basic amino acid - Arg and the Lys unless followed by Proline and so the sequence of the peptide is 1 - 2 - 3 4.

7 0

3 years ago

When a 7.40-mg sample of a compound containing carbon is burned completely, 18.6 mg of carbon dioxide is produced. What is the m

Sonja [21]

Answer:

68.6 % of the compound is carbon

Explanation:

Step 1: Data given

Mass of 7.40 mg = 0.0074 grams

Mass of carbon dioxide = 18.6 mg = 0.0186 grams

Molar mass CO2 = 44.01 g/mol

Step 2: Calculate moles CO2

Moles CO2 = mass CO2 / molar mass CO2

Moles CO2 = 0.0186 grams / 44.01 g/mol

Moles CO2 = 4.23*10^-4 moles

Step 3: Calculate moles C

For 1 mol CO2 we have 1 mol C

For 4.23*10^-4 moles CO2 we have 4.23*10^-4 moles C

Step 4: Calculate mass C

Mass C = 4.23*10^-4 moles * 12.01 g/mol

Mass C = 0.00508 grams

Step 5: calculate the mass percentage of carbon

% C= (0.00508 grams / 0.0074 grams ) * 100 %

% C = 68.6 %

68.6 % of the compound is carbon

7 0

4 years ago

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