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-Dominant- [34]
4 years ago
14

Coefficients in a chemical formula provide

Chemistry
1 answer:
iris [78.8K]4 years ago
4 0

Answer:

The relative number of products and reactants

Explanation:

  • The numerical coefficients in chemical equations show the ratio of the molecules of each substance involved in a chemical reaction that is both reactants and products.
  • The coefficients in a balanced chemical equation indicate the relative number of moles of reactants and products.
  • Additionally, coefficients are important to prove the law of conservation of mass.
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Which of the following substances has been determined to pose the most significant potential threat to human health in terms of
qwelly [4]

Answer:

Polycyclic aromatic hydrocarbons (from petroleum)

Explanation:

Polycyclic aromatic hydrocarbons (PAH) is a group of compounds which contain more than one aromatic ring. Typically examples include; naphthalene, anthracene, phenanthrene etc.

PAH are present in petroleum products. Almost everyone is regularly exposed to vehicles or other equipments that uses petroleum products as fuel. PAH is usually released from the combustion engine of these equipments and may be inhaled by humans. Thus there is a very high risk of PAH exposure compared to other items listed in the question.

PAHs are known to cause different kinds of cancer and other types of health issues in the body. The most disturbing toxicity of PAH is its carcinogenicity which makes it a very serious potential health risk for humans exposed to it on regular basis.

6 0
3 years ago
Coffe is a solution of organic substance in water
MAXImum [283]

Answer:

Verdadero!
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8 0
2 years ago
. The pI is called ________________. The rule of calculating pI of an amino acid is that first, write the dissociation equation
umka21 [38]

Answer:

The isoelectric point is that the <u>pH </u>at which the compound is in an electronically neutral form.

For diss equations<u>, p</u>lease find them in the enclosed file.

The pIs of 2 amino acids:

  • Glutamate: pI = 3,2
  • Histidine: pI = 7,6

Explanation:

Formula for the pI calculation: pI = (pKa1 + pKa2)/2

Given 3 pKa :

  • Acid glutamic with an acid sidechain:

Use the lower 2  pKas (corresponding with 2 -COOH groups)

pKa1 = 2,19; pKa2 = 4,25; so pI = 3,2

  • Histidine with 2 amino groups:

Use the higher 2 pKas ( -COOH group and -NH= group)

pKa1 = 6; pKa2 = 9,17; so pI = 7,6

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4 years ago
GUYSS JUST ONE QUESTION PLEASE HELPPP!!!!!!
Karolina [17]

Explanation:

done

..................

3 0
3 years ago
Three balloons filled with three different gaseous compounds each have a volume of 22.4 l at stp. would these balloons have the
PIT_PIT [208]
They contain the same number of molecules; however, the masses can differ depending on the molar masses of the substances.
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3 years ago
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