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SpyIntel [72]
2 years ago
9

Which statement best describes one way that plate tectonics causes change

Chemistry
1 answer:
Romashka-Z-Leto [24]2 years ago
7 0

Answer: Plate tectonics was Wegener's theory that Earth's continents rest on sections of Earth's crust that drift together and apart over time; continental drift is a hypothesis describing how plate tectonics might happen.

 

Explanation: Tectonic plate movement is a long-term environmental change.

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Which of the following is NOT a physical property?
Assoli18 [71]

Answer: I think it's D

7 0
3 years ago
1. The gases SO2, O2 and SO3 are allowed to reach equilibrium at a constant temperature. The equilibrium constant for the reacti
irina [24]

Answer:

a)

K_2=1.3x10^{2}atm^{-1/2}

b)

PCl_5\rightarrow PCl_3+Cl_2

[PCl_5]=0.0375M

Explanation:

Hello!

a) In this case, since we can see that the second reaction is equal to the half of the first reaction, we can relate the equilibrium constants as shown below:

K_2=K_1^{1/2}

Thus, by plugging in the the equilibrium constant of the first reaction we obtain:

K_2=(1.6x10^4atm^{-1})^{1/2}\\\\K_2=1.3x10^{2}atm^{-1/2}

b) In this case, for the described reaction we can write:

PCl_5\rightarrow PCl_3+Cl_2

Thus, the corresponding equilibrium expression is:

K=\frac{[PCl_3][Cl_2]}{[PCl_5]}

In such a way, since we know the equilibrium constant and the concentrations of PCl3 and Cl2 at equilibrium, we can compute the concentration of PCl5 at equilibrium as follows:

[PCl_5]=\frac{[PCl_3][Cl_2]}{K}\\

[PCl_5]=\frac{\frac{0.20mol}{4L} *\frac{0.12mol}{4L} }{0.04}

[PCl_5]=0.0375M

Best regards!

7 0
2 years ago
What is the pH of 10.0 mL solution of 0.75 M acetate after adding 5.0 mL of 0.10 M HCl (assume a Ka of acetic acid of 1.78x10-5)
ValentinkaMS [17]

Answer:

5.90

Explanation:

Initial moles of CH3COO- = 10.0/1000 x 0.75 = 0.0075 mol

Moles of HCl added = 5.0/1000 x 0.10 = 0.0005 mol

CH3COO- + HCl => CH3COOH + Cl-

Moles of CH3COO- left = 0.0075 - 0.0005 = 0.007 mol

Moles of CH3COOH formed = moles of HCl added = 0.0005 mol

pH = pKa + log([CH3COO-]/[CH3COOH])

= -log Ka + log(moles of CH3COO-/moles of CH3COOH)

= -log(1.78 x 10^(-5)) + log(0.007/0.0005)

= 5.90

4 0
3 years ago
Read 2 more answers
Why when we put salt on ice it melt​
Pavel [41]
Salt lowers the freezing point, and thus the melting point of the ice
7 0
3 years ago
Rank the following bonds in order of decreasing bond length, based on periodic trends, starting with the longest bond at the top
sattari [20]

Answer:

H-BI,H-Se,H-S,H-I,H-Br

Explanation:

One thing that must be kept in mind is that atomic size increases down the group and decreases across the period. The bond lengths of species are influenced by the relative sizes of atoms or ions present in the bond.

The bonds in the answer have been arranged on basis of their decreasing atomic size because the greater the atomic size of the atoms, the greater the bond length and vice versa.

5 0
3 years ago
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