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Anastasy [175]
1 year ago
5

PLEASE HELP!!!

Chemistry
2 answers:
umka21 [38]1 year ago
7 0

Answer:

the answer is A

Explanation:

physical changes does not change the property of matter.

Serhud [2]1 year ago
5 0

Answer: A

Explanation:

A physical property is a characteristic of a substance that can be observed or measured without changing the identity  of the substance.

According to this statement the option A that is, melting point is a physical property of matter because when a substance melts, it changes from a solid to a liquid but it still the same substance explains a specific character of a physical property

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Which of the following is the correct formula for Ca2+ reacting with NO2??
mariarad [96]

Answer:

B. Ca(NO2)2

Explanation:

Ions (charged atoms) combine with one another to form stable ionic compounds. In this case, calicium ion (Ca2+) is said to react with NO2, which has a charge of -1 i.e. +1-1(2) = 1-2 = -1.

This means that calcium has a charge of +2 while nitrite ion has charge of -1, hence, when they combine, they exchange their charges, which become their subscript as follows:

Ca2+ + NO2- → Ca(NO2)2

Ca(NO2)2 is a stable ionic compound called calcium nitrite. Notice that it takes two atoms of NO2- to react with one atom of Ca2+.

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3 years ago
Is anyone else's brainly not working or is mine the only one that is tweaking?
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Mine tweaking as well
5 0
3 years ago
(03.04 MC)<br> What is the formula for sodium nitrite?<br> O NaN<br> O NaN<br> O NaNO2<br> O NaNO3
charle [14.2K]

Answer:

NaNO2 is the formula for sodium nitrite

Explanation:

Check the selected ions chart to find out more in depth.

7 0
3 years ago
Read 2 more answers
Two common methods to generate an aldehyde is by oxidation of an alcohol and through ozonolysis.
kotykmax [81]

Answer:

<u>a</u><u>.</u><u> </u><u>True</u><u>.</u>

Explanation:

Only primary and secondary alcohols can oxidise to give an aldehyde. But a weak oxidizing agent must be used to prevent formation of a carboxylic acid or ketone.

weak oxidizing agents: Chromyl chloride, silver/oxygen/500°C

take an example of <u>e</u><u>t</u><u>h</u><u>a</u><u>n</u><u>o</u><u>l</u><u>:</u>

<u>{ \bf{CH _{3} CH_{2}OH \:  \:  \frac{Ag/O_{2} }{500 \degree C}  >  \:  \:CH _{3} CHO}}</u>

<u>{ \sf{CH _{3} CHO \:  \: is \: ethanal}}</u>

<u>B</u><u>y</u><u> </u><u>o</u><u>z</u><u>o</u><u>n</u><u>o</u><u>l</u><u>y</u><u>s</u><u>i</u><u>s</u><u>:</u>

Here, reactants are Ozone gas, Carbon tetrachloride at a temperature (<20°C), ethanoic acid, zinc and water.

take an example of propanol:

if it undergoes ozonolysis, it gives ethanal and methanal.

5 0
2 years ago
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Which formula represents an acid?
Veseljchak [2.6K]
Are there answer choices or is this a write in answer?
7 0
3 years ago
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