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Solnce55 [7]
2 years ago
13

Doctors have fought infections with penicillin for over 50 years. Recently, penicillin has not worked as well as before. Which o

f the following explanations can account for this observation? A. Some bacteria are resistant to the drug. The continued use of the drug has killed all of these bacteria. B. Penicillin use has made all bacteria resistant to it. C. Some bacteria are resistant to penicillin. The continued use of the drug has killed all but these bacteria. D. Bacteria eat penicillin, so it is not effective anymore.
Chemistry
1 answer:
Lilit [14]2 years ago
5 0

C. "A" mentions that the drug killed all of the bacteria that are resistant to the drug, and that doesn't make any sense. "B" claims that all bacteria are resistant to the drug. This is not true. "D" mentions that bacteria eat the drug, which doesn't happen.

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This drawing shows the internal anatomy of a sponge.
Evgen [1.6K]

Answer:

there is no drawing

Explanation:

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6 0
2 years ago
Write the cell notation for the voltaic cell that incorporates each of the following redox reactions:(a) Al(s) + Cr³⁺(aq) → Al³⁺
Sladkaya [172]

The cell notation for the given voltaic cell is as follows

Al(s) | Al³⁺(aq) || Cr³⁺ (aq) | Cr(s)

<h3>What is a voltaic cell?</h3>

The device in which electrons are transferred through an external source is known as a voltaic cell.

The electron flow of a Voltaic cell allows redox reactions to produce energy in the form of electricity.

It converts the energy of spontaneous redox reaction into electrical energy

An anode, a cathode, and a salt bridge are all parts of a voltaic cell's setup. The salt bridge serves to neutralize the system.

To write the cell notation, identify the oxidation and reduction reactions.

At the anode, oxidation takes place

Al(s) \longrightarrow Al^{3+} (aq) + 3e^-

At the cathode, reduction takes place

Cr^{3+} (aq) + 3e^- \longrightarrow Cr(s)

While writing cell notation, the anode is written on the left, and the cathode is written on the right

A single vertical line differentiates between the phases and a double vertical line represents the salt bridge.

Now, write the cell notation of the given Voltaic cell

Al(s) | Al³⁺(aq) || Cr³⁺ (aq) | Cr(s)

Learn more about Voltaic cells:

brainly.com/question/14312871

#SPJ4

7 0
2 years ago
Which of the following statements is true regarding both theories and laws?
Mariana [72]

Answer:

D. Supported by observations

Explanation:

Because theories change over time, they both need to be proven, they do not go off of consensus, but they do need to be supported by observations.

HOPE IT HELPS❣️

6 0
2 years ago
Which of the following would dissolve in water, and why?
Oduvanchick [21]

Answer:

It should be acetic acid.

Explanation:

When you have ionic bonds, the ionic bonds will always be water soluble; the polarity doesn't matter for this case.

4 0
3 years ago
What does expunge mean?
trasher [3.6K]

It means is where something is removed or erased completely or something unwanted or unpleasant.


Hope this helps and the right meaning of expunge.

3 0
3 years ago
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