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Masteriza [31]
3 years ago
11

What does molecule mean?

Chemistry
2 answers:
Bond [772]3 years ago
6 0

A pure substance, only one type of atom

sergiy2304 [10]3 years ago
4 0

Answer:

(a) a pure substance, only one type of atom

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Natural gas is primarily composed of ________. natural gas is primarily composed of ________. methane sulfur dioxide nitrogen ox
umka21 [38]
Natural  gas  is primarily composed of   methane (CH4)

 N
atural  gas  is a naturally  occurring  hydrocarbon  mixture  which  is  primarily  composed of Methane(CH4),  but it  also  contains ethane,propane and  heavier hydrocarbon. In addition  it  contain small amount  of nitrogen, carbon dioxide,hydrogen sulfide and traces amount of water.

7 0
3 years ago
HELP ITS IN TBE PICTURE
Art [367]
Physical change. you are physically altering it, not chemically
3 0
3 years ago
Read 2 more answers
2) Show the calculation of Kc for the following reaction if an initial reaction mixture of 0.800 mole of CO and 2.40 mole of H2
nadezda [96]

Answer:

Kc = 3.90

Explanation:

CO reacts with H_2 to form CH_4 and H_2O. balanced reaction is:

CO(g) + 3H_2 (g) \leftrightharpoons CH_4(g)  +  H_2O(g)

No. of moles of CO = 0.800 mol

No. of moles of H_2 = 2.40 mol

Volume = 8.00 L

Concentration = \frac{Moles}{Volume\ in\ L}

Concentration of CO = \frac{0.800}{8.00} = 0.100\ mol/L

Concentration of H_2 = \frac{2.40}{8.00} = 0.300\ mol/L

                 CO(g) + 3H_2 (g) \leftrightharpoons CH_4(g)  +  H_2O(g)

Initial            0.100      0.300             0   0

equi.            0.100 -x    0.300 - 3x     x    x

It is given that,

at equilibrium H_2O (x) = 0.309/8.00 = 0.0386 M

So, at equilibrium CO = 0.100 - 0.0386 = 0.0614 M

At equilibrium H_2 = 0.300 - 0.0386 × 3 = 0.184 M

At equilibrium CH_4 = 0.0386 M

Kc=\frac{[H_2O][CH_4]}{[CO][H_2]^3}

Kc=\frac{0.0386 \times 0.0386}{(0.184)^3 \times 0.0614} =3.90

8 0
4 years ago
A one or two letter symbol indicating a particular element two words no spaces
Andreyy89

Answer:

The Symbols of elements is given by :

IUPAC : International Union Of Pure and Applied Chemistry .

Its is the Universally recognuised organisation which works on Chemical nomenclature and terminology.

Explanation:

According to IUPAC the elements are named according to mythological concept of country ,mineral , place , property and scientist.

Ex:Copper name comes from the old english word Cyprus.

Rules of Naming elements :

1. The first Alphabet of the element is always Capital.Example:-  

Sodium : Na  not ''na'

2. The second alphabet is always small .Example

Sodium : Na  not ''nA' or NA

3.For most of the elements ,The symbol of the element comes from the <u>first two words.</u>

Example : Hydrogen : H

Helium : He

Copper : Cu

Rules for naming elements having mass> 100

1. The names are derived directly from the atomic number .

Ex : 0 = nil    1= un    2=bi   3=tri

2. The name always ends with ''ium''

For example :

102 = Unnilbium

5 0
4 years ago
EMPIRICAL FORMULASSSS
azamat

Answer:

34.73% of oxygen

aluminum =ALCL3

8 0
3 years ago
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