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MariettaO [177]
3 years ago
5

Which is a pure substance??

Chemistry
2 answers:
sveta [45]3 years ago
4 0
The answer is A. Table salt is a pure substance.
Lostsunrise [7]3 years ago
4 0
I think it’s a the correct answer
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Which statement best describes visible light?
tekilochka [14]

Answer:

The Visible Spectrum Visible light is the light that we can see, and thus is the only light detectable by the human eye. White light is visible light, and it contains all the colors of the rainbow, from red to violet. The range of visible wavelengths is 400 to 700 nanometers.

Explanation:

6 0
2 years ago
H20 (s) -&gt; h20 (g)<br> endothermic or exothermic
noname [10]

Answer:

Endothermic.

Explanation:

Hello there!

In this case, it is necessary to keep in mind that exothermic processes are characterized by the release of energy and the endothermic processes by the absorption of heat. In such a way, every process from solid to liquid or gas is endothermic as they require energy to separate the molecules and therefore turn out in the phase change. On the other hand, every process from gas to liquid or solid is exothermic as heat is released to rejoin the molecules and produce the phase change.

Therefore, since solid water molecules tend to be well-arranged, it is necessary to add heat to the system to produce the phase change until gas; in such a way, this process is endothermic as energy must be absorbed by the ice.

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3 0
3 years ago
Which of the following chemical formulas shows a covalent bond (a) CO2 (b) MgO (c) NaCL (d) HBr
AlexFokin [52]
The correct answer is A. CO2
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3 years ago
What is the term called ¨I nutted
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You nutted in her left eye
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3 years ago
What unit is used for atomic mass
kicyunya [14]

Answer:

universal mass unit

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The universal mass unit, abbreviated u (sometimes amu for atomic mass unit), is defined as one-twelfth of the mass of the 12C atom which has been defined to be exactly 12 u. The absolute mass of a 12C atom is obtained by dividing the value 12 by the Avogadro number (NA = 6.022 137 × 1023).

7 0
2 years ago
Read 2 more answers
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