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3 days ago

What do you think life on earth would be like if chemistry had not been put to practical use?

Chemistry

1 answer:

KiRa [976]3 days ago

5 0

Answer:

If practical applications for chemistry hadn't been explored, our understanding of what it means to be human, and the biological aspects that make us who we are, would remain unclear. Moreover, we wouldn't have achieved significant advancements in areas such as vaccines and other critical fields.

Explanation:

Additional Information

Stoichiometry in Chemistry focuses on the quantitative aspects of chemical reactions, which includes calculations related to volume, mass, and the count of ions, molecules, and elements.

Key concepts in stoichiometry include:

1. Relative atomic mass
2. Relative molecular mass

This refers to the relative atomic mass of a molecule.

3. Mole

A mole represents the number of particles in a substance equivalent to the number of atoms in 12 grams of carbon-12.

1 mole = 6.02 × 10²³ particles.

The quantity of moles can also be derived by dividing mass (in grams) by either the relative mass of an element or the relative mass of a molecule.

$\large{\boxed{\bold{mol\:=\:\frac{grams}{ relative\:mass} }}}$

Luminol (C₈H₇N₃O₂) is utilized for detecting blood traces at crime scenes, due to its reaction with iron found in blood.

To prepare a luminol stock solution, 19.0 g of luminol is mixed into a total volume of 75.0 mL of water.

Thus, the molarity is calculated as:

1. Moles of Luminol

- the relative molecular mass of Luminol:

= 8.C + 7.H + 3.N + 2.16

= 8.12 + 7.1 + 3.14 + 2.16

= 177 grams/mol.

Thus, we have:

moles = grams / relative molecular mass.

$mole=\frac{19}{177}$

moles = 0.1073.

2. Molarity (M)

M = moles / volume

$M\:=\:{\frac{ 0.1703 }{75.10^{-3} L}$

M = 1.431.

b. The concentration of luminol in the spray bottle is 6.00 × 10⁻² M. Therefore, in a 2 L solution, the number of moles is:

moles = M × volume

moles = 6 × 10⁻² × 2

moles = 0.12.

c. The molarity of the stock solution (Part A) is 1.431 M.

The diluted solution (Part B) contains 0.12 moles of luminol.

To find the volume of the stock solution (Part A) that has the same moles as the diluted solution (Part B):

volume = moles / M

$volume\:=\:\frac{0.12}{1.431}$

volume = 0.08386 L = 83.86 mL.

Further Learning

moles of water you can generate

the amount of each atom in the chemical's formula

the proportion of hydrogen to oxygen atoms in 2 L of water

Keywords: mole, volume, molarity, Luminol, relative molecular mass

6 0

7 days ago

Read 2 more answers

If the density of carbon tetrachloride is 1.59 g/ml, what is the volume in l, of 4.21 kg of carbon tetrachloride

Tems11 [854]

Density is defined as the mass-to-volume ratio. The formula for density can be expressed as:

$density = \frac{mass}{volume}$ -(1)

The density for carbon tetrachloride is provided as $1.59 g/ml$ (given).

The mass of carbon tetrachloride is $4.21 kg$ (as given).

Since, $1 kg = 1000 g$

Thus, $4.21 kg = 4210 g$

Utilizing the values in formula (1):

$1.59 g/mL = \frac{4210 g}{volume}$

$volume = \frac{4210 g}{1.59 g/mL}$

$volume = 2647.799 mL$

Since, $1 mL = 0.001 L$

Hence, $2647.799 mL = 2.65 L$

The resulting volume of carbon tetrachloride is $2.65 L$ .

6 0

11 days ago

No amino acid molecule by itself can speed up or catalyze reactions between other molecules; however, when amino acids are joine

Anarel [852]

Answer:

This indicates that the enzyme is a type of protein.

Explanation:

It is important to remember that proteins are composed of vast numbers of amino acids. Because these amino acids are tiny units, they cannot function as a catalyst on their own.

However, when they form a polymer, the protein enzyme will possess varying shapes, sizes, and both physical and chemical attributes differing from a single monomer.

Additionally, for proteins to function actively, a specific number of amino acids must combine to create a distinct shape suited to interact with another molecule, thus accelerating the chemical reaction and functioning as an enzyme.

8 0

4 days ago

Read 2 more answers

Given the connection between Aw and K (Aw=2k) could you use the ideal gas law and derive the Boltzmann constant. Water freezes a

lions [1003]

Answer:

Explanation:

The relationship between the new temperature scale and the absolute temperature scale is defined as follows

Aw = 2 K

for K = 273.15 (the freezing point of water on the absolute scale)

Aw = 2 x 273.15 = 546.3 K

Each division of the new scale is equivalent to half that of each division on the absolute scale