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4 years ago

1. Which one of the following best describe sublimation?

Chemistry

2 answers:

deff fn [24]4 years ago

5 0

D. Sublimation is a solid turning directly into a gas

Dvinal [7]4 years ago

3 0

Answer:

i think it is D.

Explanation:

The answer is D because it’s where a solid turns to a gas without going through a liquid phase if that makes sense

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What is NOOH in amino acid?

mihalych1998 [28]

<span>-NH2 or, in its ionized form, -NH3+. Amino groups are the functional groups that bestow the "amino" in amino acid. They also readily ionize, gaining a proton (hydrogen ion), and thus serve as weak bases.</span>

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3 years ago

I need help with three questions plz help me out. If i don't past i won't progress onto the next grade.

8_murik_8 [283]

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3 years ago

A sample of an unknown compound has a percent composition of 52.14% carbon, 13.13% hydrogen, and 34.73% oxygen. Which compounds

Artemon [7]

<h3>Answer:</h3>

The two possible compounds are;

1) Dimethyl Ether H₃C--O--CH₃

2) Ethanol H₃C--CH₂--OH

<h3>Solution:</h3>

Step 1: Calculate Moles of each Element;

Moles of C = %C ÷ At.Mass of C

Moles of C = 52.14 ÷ 12.01

Moles of C = 4.341 mol

Moles of H = %H ÷ At.Mass of H

Moles of H = 13.13 ÷ 1.01

Moles of H = 13.00 mol

Moles of O = %O ÷ At.Mass of O

Moles of O = 34.73 ÷ 16.0

Moles of O = 2.170 mol

Step 2: Find out mole ratio and simplify it;

C H O

4.341 13.00 2.170

4.341/2.170 13.00/2.170 2.170/2.170

2 5.99 1

2 6 1

Hence, Empirical Formula = C₂H₆O

<h3>Result:</h3>

As the molecular mass of compound is not given therefore, we can assume and guess the empirical formula to be the molecular formula. Hence, possible compounds are,

1) Dimethyl Ether H₃C--O--CH₃

2) Ethanol H₃C--CH₂--OH

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3 years ago

Which property of physical changes explains why matter is conserved in a physical change? The arrangements of particles do not c

Galina-37 [17]

Mass is the amount of matter in an object, and weight is the downward pull on an object due to gravity. Which property of physical changes explains why matter is conserved in a physical change? The bonds between atoms do not break; it is only the arrangement that changes.

hope I helped! :)

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3 years ago

Calculate the final temperature of the system: A 50.0 gram sample of water initially at 100 °C and a 100 gram sample initially a

katrin2010 [14]

Answer:

The final temperature of the system is 42.46°C.

Explanation:

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

$q_1=-q_2$