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PilotLPTM [1.2K]
3 years ago
6

What data should be plotted to show that experimental concentration data fits a first-order reaction? g?

Chemistry
1 answer:
podryga [215]3 years ago
7 0
I do not know i am doing this for the points
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Determine whether each statement is an example of a physical change or a chemical change. Newspaper yellows in the sun. Physical
miss Akunina [59]

Answer:

the newspaper one is a chemical change because the chemicals in the paper have reacted with something and turned a different color. the wax one is a physical change because it is a change in the phase of matter, which is always a physical change (still the same substance chemically)

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2 years ago
How are bones important to the lymphatic system?
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Our bone marrow continuously makes new red and white blood cells. The lymphatic system consists of the bone marrow, the spleen, the thymus (in young people), and lymph nodes.
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3 years ago
Which of the following acids should be used to prepare a buffer with a pH of 4.5?A. HOC6H4OCOOH, Ka = 1.0 x 10^-3B. C6H4(COOH)2,
ioda

Answer:

C. CH3COOH, Ka = 1.8 E-5

Explanation:

analyzing the pKa of the given acids:

∴ pKa = - Log Ka

A. pKa = - Log (1.0 E-3 ) = 3

B. pKa = - Log (2.9 E-4) = 3.54

C. pKa = - Log (1.8 E-5) = 4.745

D. pKa = - Log (4.0 E-6) = 5.397

E. pKa = - Log (2.3 E-9) = 8.638

We choose the (C) acid since its pKa close to the expected pH.

⇒ For a buffer solution formed from an acid and its respective salt, we have the equation Henderson-Hausselbach (H-H):

  • pH = pKa + Log ([CH3COO-]/[CH3COOH])

∴ pH = 4.5

∴ pKa = 4.745

⇒ 4.5 = 4.745 + Log ([CH3COO-]/[CH3COOH])

⇒ - 0.245 = Log ([CH3COO-]/[CH3COOH])

⇒ 0.5692 = [CH3COO-]/[CH3COOH]

∴ Ka = 1.8 E-5 = ([H3O+].[CH3COO-])/[CH3COOH]

⇒ 1.8 E-5 = [H3O+](0.5692)

⇒ [H3O+] = 3.1623 E-5 M

⇒ pH = - Log ( 3.1623 E-5 ) = 4.5

6 0
2 years ago
Which of the following expands to fill the container it is in, but can be compressed to a smaller volume when pressure is applie
Andrew [12]
Oxygen gas expands in a container and when pressure is applied it liquifies and occupies a smaller volume

hope that helps  <span />
3 0
3 years ago
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In the news recently, an individual poured an unknown liquid substance over a female victim and fled on
8_murik_8 [283]

Answer:

either an acid or a base

Explanation:

Especially, concentrated acids and bases tend to do enormous amounts of chemical burns. People usually think its only acids but the strongest of bases can easily melt our skin.

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