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4 years ago

39 Which formula represents a molecule with the most polar bond?(1) CO (3) HI (2) NO (4) HCl

Chemistry

2 answers:

igor_vitrenko [27]4 years ago

4 0

Which formula represents a molecule with the most polar bond? (1) CO (3) HI (2) NO (4) HCl

The formula that represents a molecule with the most polar bond is the HCl, hydrochloric acid. The answer is number 4.

Mrrafil [7]4 years ago

4 0

Answer: (1) CO

Explanation: A molecule is said to be polar when it has atoms with different electronegativities. The more is the difference in electronegativity, the more polar is the bond.

Electronegativity of carbon and oxygen are 2.5 and 3.5 respectively. Thus difference is (3.5-2.5)=1.0.

Electronegativity of hydrogen and Iodine are 2.1 and 2.7 respectively. Thus difference is (2.7-2.1)=0.6.

Electronegativity of nitrogen and oxygen are 3.0 and 3.5 respectively. Thus difference is (3.5-3.0)=0.5.

Electronegativity of hydrogen and chlorine are 2.1 and 3.0 respectively. Thus difference is (3.0-2.1)=0.9.

Thus as the highest difference of electronegativity is among carbon and oxygen, CO is the most polar.

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4 years ago

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The equation 2NaNO3 CaCl2=2NaCl Ca(NO3)2 is balanced. How many atoms of oxygen are there on each side of the equations?

morpeh [17]

Answer: There are 6 atoms on reactant side and 6 atoms on product side.

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3 years ago

A gaseous hydrocarbon contains 80% carbon and 20% hydrogen, 1dm3 of the compound at s.t.p weighs 1.35g find the molecular formul

Cloud [144]

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C₂H₆

Explanation:

To obtain molecular formula of the gas, you need to find first its molecular mass.

To find molecular mass you need to obtain moles of gasbecause molecular mass is the ratio between mass of the gas and the volume it occupies.

As at STP, 1 mole of a gas occupies 22.4dm³, 1dm³ of gas are:

1dm³ × (1mol / 22.4dm³) = 004464moles.

Its molecular mass is:

1.35g / 004464moles =

30.24g/mol

Now, if the gas is 80%C and 20%H, its <em>empirical formula (Simplest ratio of atoms in a molecule) </em>is:

80% Carbon × (1mol / 12.01g) = 6.66moles C

20% Hydrogen × (1mol / 1.01g) = 19.8moles H

Ratio of H:C is:

19.8 mol H / 6.66mol C = 3

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3 years ago

In which situation will the friction between the object and surface on which it is moving be increased. A the object is pushed o

aliina [53]

Answer:

C the object is pushed with greater force against the surface

Explanation:

The force of friction between an object and a surface is the resistive force exerted by the surface on the object, due to the roughness of the two surfaces, and that tends to resist the motion of sliding of the object over the surface.

The force of friction exerted on an object over a surface is given by

$F_f=\mu N$

where

$\mu$ is the coefficient of friction, whose value depends on the roughness of the surface

N is the normal reaction exerted by the sutrface on the object

Let's now analyze each statement; here we want the force of friction to be increases:

A the object is pushed over a long distance. --> FALSE, this is independent on the force of friction.

b the weight of the moving object is decreased. --> FALSE: if the weight decreases, the normal reaction decreases, so the force of friction decreases as well.

C the object is pushed with greater force against the surface. --> TRUE: in this case, the normal reaction increases, so the force of friction increases.

D the surface on which the object is moving is made smoother --> FALSE: in this case, the coefficient of friction decreases, so the force of friction decreases.

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3 years ago