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lapo4ka [179]
3 years ago
9

Answer pls will give brainliest

Chemistry
1 answer:
olchik [2.2K]3 years ago
3 0

Answer:

I am going to say B

Explanation:

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What is the percentage of hydrogen in c2h4
jarptica [38.1K]

Ethylene- C2H4 = 85.7% Carbon and 14.3% Hydrogen


Find the atomic masses for each element and multiply it by the number of atoms in the compound, then add.


C- 12.0 * 2= 24.0


H- 1.00 * 4= 4.00


-----------------------


28.0


Take the masses for each element and divide it by the total mass. Then change the answer to get the percent.


C 24.0 / 28.0= .857 = 85.7%


H 4.00 / 28.0= .143 = 14.3%


<h3>Ethylene is 85.7% Carbon and 14.3% Hydrogen </h3>
8 0
3 years ago
What is the KE of 750 kg car moving at 25 m/s?
Ymorist [56]

Answer: 234,375 J=234.375 kJ

Explanation:

K= m*V²/2

K=750kg*625m²/s²/2=234375 J

8 0
3 years ago
Checking if my answer is correct: I got LARQY, but I'm pretty sure it's wrong. Can somebody please help?
babunello [35]

Answer:

you are right

Explanation:

and i do not need to explain it because you did

8 0
3 years ago
Which of the following statements holds true for a chemical change?
ad-work [718]

Answer : The correct option is C.

Explanation :

Chemical change : It is defined as a change in which a new compounds are formed by the chemical reaction. Changes occurs in their chemical composition and properties.

The molecular structure of a substance changes in a chemical reaction is a chemical change.

  • Change in molecular structure means that there is a breaking and formation of bonds in a molecule.

The example of chemical change in terms of change in molecular structure is the reaction of hydrogen with oxygen.

The reaction of hydrogen with oxygen is,

H_2(g)+O_2(g)\rightarrow 2H_2O(l)

In this reaction, the H-H bond is break and O-H bond is form.


6 0
3 years ago
Read 2 more answers
Alkaline earth metals are very reactive because of how many valence electrons ?
Alborosie
Their is 2 valence electrons
8 0
3 years ago
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