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3 years ago

Which statement below is true?

Chemistry

1 answer:

kykrilka [37]3 years ago

7 0

Answer:

a) At a given temperature, C₂H₆ has a higher vapor pressure than C₄H₁₀.

Explanation:

Which statement below is true?

a) At a given temperature, C₂H₆ has a higher vapor pressure than C₄H₁₀. TRUE. C₂H₆ has a lower molar mass than C₄H₁₀ and a higher vapor pressure at most temperatures.

b) The strongest intermolecular attractive forces present in liquid CCl₄ are dipole-dipole forces. FALSE. CCl₄ is nonpolar, so the strongest intermolecular forces are dispersion forces.

c) HCl has a higher boiling point than LiCl. FALSE. LiCl (ionic compound) has a higher boiling point than HCl (covalent compound).

d) H₂O has a greater polarizability than H₂Se. FALSE. Se has a larger atomic radius than O which is why H₂Se has a greater polarizability than H₂O.

e) In general, the stronger the intermolecular attractive forces, the lower the ∆Hºvap. FALSE. In general, the stronger the intermolecular attractive forces, the higher the ∆Hºvap.

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Match the following associations. Exothermic or endothermic

Alekssandra [29.7K]

Answer:

1) ∆H is positive $\Rightarrow$ Endothermic

2) $E_p>E_r$ $\Rightarrow$ Endothermic

3) Energy is absorbed $\Rightarrow$ Endothermic

4) $E_r>E_p$ $\Rightarrow$ Exothermic

5) ∆H is negtive $\Rightarrow$ Exothermic

Explanation:

∆H is called as enthalpy change

It is also called as Heat of reaction

Energy is required for the bond to break a bond.

Energy is released when a bond is formed.

$H_2+Cl_2>2HCl$

that is

$H-H+Cl-Cl>2H-Cl$

We see in this equation, bonds between hydrogen and chlorine molecules gets broken and on the right side bond is formed in HCl.

If energy of products greater than energy of reactants then the reaction enthalpy change is endothermic .

If energy of products lesser than energy of reactants then the reaction enthalpy change is exothermic .

For example

$\Delta H=E_p-E_r$

$=30KJ-20KJ$

$=+10KJ$

(positive hence endothermic)

$\Delta H=E_p-E_r$

$=10KJ-40KJ$

$=-30KJ$

(negative hence exothermic)

8 0

3 years ago

What new information can you add to your definition of chemical change?

ivolga24 [154]

Something that can not be undone. Like baking bread..cant be undone.

5 0

3 years ago

What volume in mt, of 0.5a M1HCI solution is needed to neutralize 77 ml of 1.54 M NaOH solution?

Rainbow [258]

Answer:

237.2 mL.

Explanation:

We have the rule: at neutralization, the no. of millimoles of acid is equal to the no. of millimoles of the base.

(XMV) acid = (XMV) base.

where, X is the no. of (H) or (OH) reproducible in acid or base, respectively.

M is the molarity of the acid or base.

V is the volume of the acid or base.

(XMV) HCl = (XMV) NaOH.

For HCl; X = 1, M = 0.5 M, V = ??? mL.

For NaOH, X = 1, M = 1.54 M, V = 77.0 mL.

∴ V of HCl = (XMV) NaOH / (XV) HCl = (1)(1.54 M)(77.0 mL) / (1)(0.5 M) = 237.2 mL.

8 0

3 years ago

Clouds are formed by the ________ water

tatuchka [14]

Clouds are made of water. When water evaporates it turns into clouds. So, I think the answer is EVAPORATED water.

4 0

3 years ago

Please help quickly as possible thank you :)

WARRIOR [948]

Answer:

moving object transfers some to the stationary object causing it to move a it. remember that momentum is always conserved though - it is the same at the start before the event and after it.

Explanation:

4 0

3 years ago