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2 years ago

Assignment

Chemistry

1 answer:

Jobisdone [24]2 years ago

6 0

Answer:

$\boxed {\boxed {\sf Ionic \ bond}}$

Explanation:

First, let's look at the Periodic Table.

We see that aluminum is a metal, while oxygen is a non-metal.

Now, let's recall three types of bonds

Ionic: typically forms between a metal and a non-metal
Covalent: usually forms between non-metals
Metallic: tends to form with metals

Since we have a metal (Al) and a non-metal (O), aluminum oxide must have an ionic bond.

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Solnce55 [7]

The freezing point depression of water is 1.86°C/m.kg
K2S dissociates: 
K2S ↔ 2K+ + S 2- 
1mol K2S will produce 3 mol of ions. 
Therefore in the freezing point equation: i = 3 
Depression of freezing point = Kf * i* m 
Depression of freezing point = 1.86*3*0.195 
Depression of freezing point = 1.088°C 
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Two moles of ideal He gas are contained at a pressure of 1 atm and a temperature of 300 K. 34166 J of heat are transferred to th

iragen [17]

Explanation:

The given data is as follows.

n = 2 mol, P = 1 atm, T = 300 K

Q = +34166 J, W= -1216 J (work done against surrounding)

$C_{v}$ = $\frac{3R}{2}$

Relation between internal energy, work and heat is as follows.

Change in internal energy ( $\Delta U$ ) = Q + W

= [34166 + (-1216)] J

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Also, $\Delta U = n \times C_{v} \times \Delta T$

= $3R \times (T_{2} - T_{1})$

32950 J = $3 \times 8.314 J/mol K \times (T_{2} - 300 K)$

$\frac{32950}{24.942} = T_{2} - 300 K$

1321.06 K + 300 K = $T_{2}$

$T_{2}$ = 1621.06 K

Thus, we can conclude that the final temperature of the gas is 1621.06 K.

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3 years ago

Why is the iron block the hardest to lift?

vekshin1

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Explanation:

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In the formula for the compound XCl4, the X could represent (1) C (3) Mg (2) Η (4) Zn

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Correct Answer: option 1 i.e. C

Reason:
The the compound of interest i.e. XCl4, since there are 4 Cl atoms bonded to X. This signifies that the valency of X is 4.

There atomic number of C is 6. It's electronic configuration is giving by 1s2 2s2 2p2. Thus, there are 4 electrons in valence shell of C. This signifies that valency of C is 4. Hence the compound present in present case is CCl4.

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4 years ago

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