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Anna007 [38]
3 years ago
10

Please help with this

Chemistry
2 answers:
Whitepunk [10]3 years ago
3 0

Type, Fossil Fuels, green house gasses

Varvara68 [4.7K]3 years ago
3 0
The answers are in order: coal , heat , stone , wood , soil , and water! hope this helped. sorry if i’m wrong.
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Hydrocarbons are compounds that contain
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2) carbon and hydrogen only.
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4 years ago
What is the wavelength of a 229 Hz sound wave moving at a speed of 345 m/s?
ANTONII [103]

Answer:

wave length=speed/frequency

=345/229

8 0
3 years ago
. What is meant by periodic in Periodic Table?
Strike441 [17]

Answer:

B

Explanation:

Periodic refers to properties that repeat at certain intervals. Click to see full answer. In respect to this, what does periodic mean in the term periodic table? In the context of chemistry and the periodic table, periodicity refers to trends or recurring variations in element properties with increasing atomic number.

3 0
3 years ago
A 69.1-g sample of h2o contains how many molecules of water?
8_murik_8 [283]
  The  number  of  molecules   of   water   is calculated  as  follows

find the  moles of   water=  moles=mass/molar  mass

moles  =   69.1g/18 g/mol   =  3.84  moles
by  use of  Avogadro  law constant 
that  is  1  mole =   6.02  x10^23   molecules  what   about  3.84   moles  of  water

  the  molecules  of  water  =  (3.84   x   6.02  x10^23) = 2.312  x10^24  molecules
5 0
3 years ago
Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 4.90 moles of magnesium perchlorate, Mg(ClO4)2.]\
Leviafan [203]

Answer:

 4.90  moles of  Mg(ClO_4)_2   will produce  (9.8) moles of  Cl^{-} ,

                                                    (4.90) moles of Mg^{2+} and

                                                    (39.2) moles of  O^{2-}

Explanation:

From the question we are told that

  The number of moles of  is  n =  4.90  \ mols

The formation reaction of Mg(ClO_4)_2  is

             Mg^{2+} + 2 Cl^{-} + 8O^{2+} \to Mg(ClO_4)_2  

From the reaction we see that

   1 mole of  Mg(ClO_4)_2  is formed by 2 moles of Cl^{-} 1 mole of  Mg^{2+} and 4  O^{2-}

 This implies that

   4.90  moles of  Mg(ClO_4)_2   will produce  (2 * 4.90) moles of  Cl^{-} ,

                                                    (1 * 4.90) moles of Mg^{2+} and

                                                    (8 * 4.90) moles of  O^{2-}

So

  4.90  moles of  Mg(ClO_4)_2   will produce  (9.8) moles of  Cl^{-} ,

                                                    (4.90) moles of Mg^{2+} and

                                                    (39.2) moles of  O^{2-}

                           

4 0
3 years ago
Read 2 more answers
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