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2 years ago

A chemist is studying how a new type of paper absorbs ink. Which is a macroscopic view of the chemist’s subject?

Chemistry

2 answers:

nadezda [96]2 years ago

8 0

B. one sheet of the new type of paper

dalvyx [7]2 years ago

8 0

Answer: B. one sheet of the new type of paper.

Explanation: Macroscopic views are the those observable which are presented on the larger scale rather than being on the smaller scale.

Now, it is given that the chemist us studying a new type pf paper that absorbs ink.

Thus option A explains the microscopic view about the individual fibers that make up the paper. Those small fibers which are responsible for the making of the paper.

Option C also explains the microscopic view as it is asking for the chemical composition of the fibers of the paper.

Thus option B is the only macroscopic view which explains the whole one sheet of the new type of water which includes the knowledge of the individual fibers as well as the chemical composition of the fibers as well.

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Describe the differences between bonding in an ionic compound and bonding in a covalent molecule.

Fudgin [204]

a covalent bond and an ionic bond. An ionic bond if formed from the transfer of electrons from the outer shell of atoms. ... An example of this is NaCl, where the sodium atom becomes Na+ due to the loss of electrons, and the chlorine atom becomes the negatively charged chloride (Cl-).

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2 years ago

A student is asked to standardize a solution of barium hydroxide. He weighs out 0.978 g potassium hydrogen phthalate (KHC8H4O4,

Sav [38]

Answer:

(A) 0.129 M

(B) 0.237 M

Explanation:

(A) The reaction between potassium hydrogen phthalate and barium hydroxide is:

2HA + Ba(OH)₂ → BaA₂ + 2H₂O

Where A⁻ is the respective anion of the monoprotic acid (KC₈H₄O₄⁻).

We convert mass of phthalate to moles, using its molar mass:

0.978 g ÷ 156 g/mol = 9.27x10⁻³ mol = 9.27 mmol

Now we convert mmol of HA to mmol of Ba(OH)₂:

9.27 mmol HA * $\frac{1mmolBa(OH)_{2}}{2mmolHA}$ = 6.64 mmol Ba(OH)₂

Finally we calculate the molarity of the Ba(OH)₂ solution:

6.64 mmol / 35.8 mL = 0.129 M

(B) The reaction between Ba(OH)₂ and HCl is:

2HCl + Ba(OH)₂ → BaCl₂ + 2H₂O

So the moles of HCl that reacted are:

17.1 mL * 0.129 M * $\frac{2mmolHCl}{1mmolBa(OH)_2}$ = 4.41 mmol HCl

And the molarity of the HCl solution is:

4.41 mmol / 18.6 mL = 0.237 M

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2 years ago

What are the types of connective tissue? Describe each type, and give an example of each.

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Answer:

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Explanation:

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3 years ago

What is the relationship between developed land, population and resource use?

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Explanation:

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2 years ago

The equilibrium constant for the reaction

Hitman42 [59]

The question is incomplete, here is the complete question:

The equilibrium constant for the reaction

N₂O₄(g)⇌2NO₂ at 2°C is Kc = 2.0

If each yellow sphere represents 1 mol of N₂O₄(g) and each gray sphere 1 mol of NO₂ which of the following 1.0 L containers represents the equilibrium mixture at 2°C?

The image is attached below.

Answer: The system which represents the equilibrium having value of $K_c=2.0$ is system (b)

Explanation:

Equilibrium constant in terms of concentration is defined as the ratio of concentration of products to the concentration of reactants each raised to the power their stoichiometric ratios. It is expressed as $K_c$