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Sergio [31]
3 years ago
13

PLS HELP ASAP ON BOTH

Chemistry
2 answers:
NNADVOKAT [17]3 years ago
7 0
19. Mesosphere I think

20. True not sure though
lesya692 [45]3 years ago
3 0

Answer:

mesosphere

I hope this helps a little bit.

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Convert 678.92 cm into meters​
Anastaziya [24]

Answer:6.7892 meters

Explanation:

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A student dissolves equal amounts of salt in equal amounts of warm water, room-temperature water, and ice water. Which result is
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doesnt salt desolve ice? so wouldn't the salt dissolve in the ice water?

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Silicon has 2 isotopes, Silicon-28 with an abundance of 90% and Silicon-30 with an abundance of 10%. Find the AAM for Silicon.
JulsSmile [24]

Answer:

RAM

RAM = (mass \: of \:  ^{28} Si \:  \times \%abundance) + (mass \: of \:  ^{30} Si \:  \times \%abundance) \\ RAM = (28 \times 90\%) + (30 \times 10\%) \\ RAM = 25.2 + 3 \\ RAM = 28.2

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3 years ago
Which compound contains both covalent and ionic bonds? <br> a. NCl3 b. NaF c. HCN d. NH4OH
Marina86 [1]
<h2>NH_4OH contains both covalent and ionic bonds.</h2>

Explanation:

A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.

An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal.

a. NCl_3 contain covalent bonds as they are made up of non metals only.

b. NaF contain ionic bonds as they are made up of sodium metal and fluorine non metal.

c. HCN contain covalent bonds as they are made up of non metals only.

d. NH_4OH contain  ionic bonds between NH_4 and OH and covalent between N and H in NH_4^+

Learn more about ionic and covalent bonds

brainly.com/question/13212100

brainly.com/question/2877158

8 0
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Radiation from structures that have a very high temperature is collected by
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I would radiation a robotics arm but for a heated surphace is Shiny surfaces are poor absorbers and emitters (but they are good reflectors of infrared radiation).

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