Which of the following statements is most accurate?

Chemistry

1 answer:

Troyanec [42]3 years ago

4 0

Answer:

Explanation:

This is because exothermic reactions occurs when bnds are formed, and involves the release of energy.

Endothermic reaction occur when bonds are broken,and involves absorption of energy.

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If an element is lustrous, brittle, and a semi-conductor, how would you classify it?

just olya [345]

Metalloid

Explanation:

If an element is lustrous, brittle and a semi-conductor, it is best classified as a metalloid.

Metalloids shares attributes of metals and non-metals.

They are often described as semi-metals as they do not share the full properties that makes a metal a metal.
Metalloids are lustrous but not malleable like metals.
They do not conduct electricity but they do so on certain conditions.
Examples are silicon, germanium, boron, arsenic e.t.c
They are usually found in the middle of the periodic table.
They are not readily alloyed with metals.

Learn more:

Metalloid brainly.com/question/3023499

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7 0

3 years ago

Try It: Evidence of Population Change

erma4kov [3.2K]

The answer to this would be false.

4 0

3 years ago

Explain why the replacement of the glutamic acid by valine changes the way that molecules of b-globin interact with each other.

aleksandr82 [10.1K]

For the answer to the question above, Hydrophobic regions and hydrophilic regions in the molecules of the b-globin. The replacement causes these hemoglobin molecules to be stickies which gives the cell its sickle shape.
I hope this helps. Have a nice day!

3 0

3 years ago

When hydrogen peroxide (H2O2) is added to potassium iodide (KI) solution, the hydrogen peroxide decomposes into water (H2O) and

riadik2000 [5.3K]

Answer:

D. Catalyst

Explanation:

Because a Catalyst is a substance that causes or accelerates a chemical reaction without itself being affected.

5 0

2 years ago

What type of bond is this combination likely to form

kari74 [83]

Answer:

A combination is certainly possible, but you should not take formal charges so literally

Normally, when a covalent bond is found, the two atoms both bring in one electron. As you identify correctly, in the case of nitric acid that would not be possible completely. If you draw the different possible resonance structures, the most likely structure has a single bond between the nitrogen and an oxygen where the oxygen has 3 lone pairs and both electrons in the bond are donated by the nitrogen. This makes the nitrogen "positive" and that oxygen "negative", but in fact the electrons move more freely in the molecule and charges are more distributed. You will not be able to find "the negatively charged" oxygen atom.

Explanation:

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3 years ago