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victus00 [196]
3 years ago
10

Which element must be present in an organic compound?(1) hydrogen (3) carbon(2) oxygen (4) nitrogen

Chemistry
2 answers:
White raven [17]3 years ago
7 0
CARBON is the element that must be present in an organic compound. 
dmitriy555 [2]3 years ago
7 0

the answer is 3) carbon

main component of organic compounds are the element carbon

C forms covalent compounds with other C atoms and form long chains resulting in forming compounds that are very useful to us in our day to day life

human body is made of 4 types of organic molecules.

C covalently bonds with other atoms such as H, O and N etc. forming a large array of useful compounds

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Sladkaya [172]
Sonia observed that the two balloons repelled each other. This is because both balloons acquired the same charge when she rubbed them with the piece of wool, and like charges repel each other.
6 0
3 years ago
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Which is a diatomic molecule?<br><br> A)Ar<br><br> B)CO<br><br> C)CO2<br><br> D)NaCl
LUCKY_DIMON [66]

Answer:

C. Co2

Explanation:

Oxygen is a diatomic molecule because 2 atoms are conisistebof a normal molecule.

5 0
3 years ago
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I’m struggling with dimensional analysis in chemistry! Will someone please help me with .74 Kcal/min to cal/sec ? Explain and gi
valina [46]

Answer:

            12.33 cal/sec

Explanation:

As we know,

                          1 Kcal  =  1000 cal

So,

                     0.74 Kcal  =  X cal

Solving for X,

                      X =  (0.74 Kcal × 1000 cal) ÷ 1 Kcal

                      X =  740 cal

Also we know that,

                      1 Minute  =  60 Seconds

Therefore, in order to derive cal/sec unit replace 0.74 Kcal by 740 cal and 1 min by 60 sec in given unit as,

                                       = 740 cal / 60 sec

                                       = 12.33 cal/sec

3 0
3 years ago
4. Write the electronic configuration of first 20 elements in the periodic table.
DIA [1.3K]

Answer:

Name Atomic Number Electron Configuration Period 1 Hydrogen 1 1s1 Helium 2 1s2 Period 2 Lithium 3 1s2 2s1 Beryllium 4 1s2 2s2 Boron 5 1s2 2s22p1 Carbon 6 1s2 2s22p2 Nitrogen 7 1s2 2s22p3 Oxygen 8 1s2 2s22p4 Fluorine 9 1s2 2s22p5 Neon 10 1s2 2s22p6 Period 3 Sodium 11 1s2 2s22p63s1 Magnesium 12 1s2 2s22p63s2 Aluminum 13 

7 0
3 years ago
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Yanka [14]

Answer:

ice. ......

Explanation:

because it cold

6 0
3 years ago
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