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inysia [295]
4 years ago
12

The model shown in the diagram describes how the tongue works. When a red block is placed into a the correctly shaped hole, the

nearest bulb lights up. A lit bulb represents a signal being sent to the brain.******According to the model, how does the tongue function?
A) The tongue alerts the brain when food is absent.
B) The tongue changes the shapes of food molecules.
C) The tongue contains special cells for different types of food molecules.
D) The tongue receives information from the brain to determine how food tastes.

Which level of organization is the HIGHEST?
1 point
A) tissue
B) an organ
C) an organism
D) an organ system

Which represents the correct order of cell organization after cellular differentiation (simple to complex)?
1 point
A) organ system→organ→tissue→cell
B) cell→organ→organ system→tissue
C) tissue→cell→organ→organ system
D) cell→tissue→organ→organ system

Cells undergo differentiation during embyonic development. An individual skin cell develops differently from a muscle cell because
1 point
A) the cells have different DNA.
B) the cells have different genes.
C) the cells express different genes.
D) the cells have different chromosomes.
Chemistry
1 answer:
rosijanka [135]4 years ago
6 0

Answer:

d and d

Explanation:

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Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3). The balanced equation isC7H6
prisoha [69]

<u>Answer:</u>

<u>For a:</u> The mass of acetic anhydride needed is 73.91 grams.

<u>For b:</u> The theoretical yield of aspirin is 130.43 grams.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}   .....(1)

  • <u>For a:</u>

Given mass of salicylic acid = 1.00\times 10^2g=100g

Molar mass of salicylic acid = 138.121 g/mol

Putting values in equation 1, we get:

\text{Moles of salicylic acid}=\frac{100g}{138.121g/mol}=0.724mol

For the given chemical reaction:

C_7H_6O_3+C_4H_6O_3\rightarrow C_9H_8O_4+CH_3COOH

By stoichiometry of the reaction:

1 mole of salicylic acid reacts with 1 mole of acetic anhydride.

So, 0.724 moles of salicylic acid will react with = \frac{1}{1}\times 0.724=0.724mol of acetic anhydride.

Now, to calculate the mass of acetic anhydride, we use equation 1:

Moles of acetic anhydride = 0.724 moles

Molar mass of acetic anhydride = 102.09 g/mol

Putting values in equation 1, we get:

0.724mol=\frac{\text{Mass of acetic anhydride}}{102.09g/mol}\\\\\text{Mass of acetic anhydride}=73.91g

Hence, the mass of acetic anhydride needed is 73.91 grams.

  • <u>For b:</u>

By stoichiometry of the reaction:

1 mole of salicylic acid is producing 1 mole of aspirin.

So, 0.724 moles of salicylic acid will produce = \frac{1}{1}\times 0.724=0.724mol of aspirin.

Now, to calculate the mass of aspirin, we use equation 1:

Moles of aspirin = 0.724 moles

Molar mass of aspirin = 180.158 g/mol

Putting values in equation 1, we get:

0.724mol=\frac{\text{Mass of aspirin}}{180.158g/mol}\\\\\text{Mass of aspirin}=130.43g

Hence, the theoretical yield of aspirin is 130.43 grams.

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