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3 years ago

I need to know all the answers for this homework!!!!

Chemistry

1 answer:

maw [93]3 years ago

5 0

1. 100 C

2. Point B to C is the ices heat capacity

3. During the points D to E the bonds of the water molecules build up enough kinetic energy to break their intermolecular bonds (not intra), which can lead to gas.

4. Between points D and E the energy is being released the energy required is equivalent along the line.

5. Between point E and D the water is converting to water (condensation)

6. Energy is being released 2260 j/g

7. Yes, but only under extreme volumetric pressures

8. D and E or B and C

9. Freezing (the water is also becoming less dense)

10. Melting or if water already, absorbtion of energy

11. released.

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Reaction Rates

inn [45]

Answer:

PART A 1st order in A and 0th order in B

Part B The reaction rate increases

Explanation:

PART A

The rate law of the arbitrary chemical reaction is given by

$-r_A=k\times\left[A\right]^\alpha\times\left[B\right]^\beta\bigm$

Replacing for the data

Expression 1 $0.00639=k\times{0.12}^\alpha\times{0.22}^\beta$

Expression 2 $0.01280=k\times{0.24}^\alpha\times{0.22}^\beta$

Expression 3 $0.00639=k\times{0.12}^\alpha\times{0.11}^\beta$

Making the quotient between the fist two expressions

$\frac{0.00639}{0.01280}=\left(\frac{0.12}{0.24}\right)^\alpha$

Then the expression for $\alpha$

$\alpha=\frac{ln\frac{0.00639}{0.01280}}{ln\frac{0.12}{0.24}}=1\bigm$

Doing the same between the expressions 1 and 3

$\frac{0.00639}{0.00639}=\left(\frac{0.22}{0.11}\right)^\beta$

Then

$\beta=\frac{ln\frac{0.00639}{0.00639}}{ln\frac{0.22}{0.11}}=0\bigm$

This means that the reaction is 1st order respect to A and 0th order respect to B .

PART B

By the molecular kinetics theory, if an increment in the temperature occurs, the molecules will have greater kinetic energy and, consequently, will move faster. Thus, the possibility of colliding with another molecule increases. These collisions are necessary for the reaction. Therefore, an increase in temperature necessarily produces an increase in the reaction rate.

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3 years ago

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uysha [10]

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It gives the number of protons in the nucleus of each atom of that element.

Explanation:

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Which ionic compound would you expect to have the highest melting point? a. Al-N b. Fe-O C. W-C

Elza [17]

Answer:

b. Fe-O

Explanation:

A way to predict melting points for ionic compounds is with electronegativity.

Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

The most electronegativity difference (E.D.), the highest melting point, thus:

E.D. Al-N = 3,0 - 1,6 = 1,4

E.D. Fe-O = 3,5 - 1,8 = 1,7

E.D. W-C = 2,5 - 1,7 = 0,8

The most electronegativity difference is from Fe-O, thus, this ionic compound will have the highest melting point.

I hope it helps!

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4 years ago