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3 years ago

Which molecule has a tetrahedral arrangement of electron pairs but is not a tetrahedral molecule?

Chemistry

2 answers:

Rashid [163]3 years ago

8 0

Answer:

Water

Explanation:

Electron geometry (arrangement) is tetrahdral but its molecular geometry is bent.

Oxygen has 6 electrons in the outermost shell but it only uses 2 electrons for forming bonds with 2 Hydrogen atoms. The oxygen atom - center atom is surrounded by four electron pairs (2 pairs with 2 Hydrogen atoms, 2 lone pairs) so that its shape is tetrahedral. In contrast, it's supposed to be linear shaped but in fact it has bent molecular geometry due to lone pairs repel other electron pairs more strongly than bonded electrons.

MariettaO [177]3 years ago

5 0

Water

This is due to the fact that the oxygen atom in water also contains two lone pairs of electrons.

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Given a gas with an initial volume of 3.0 L and a temperature of 290 K, what is the final volume if the

statuscvo [17]

Answer:

2.8l

Explanation:

just make v2 de subject

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2 years ago

When steam condenses into water, __________. When steam condenses into water, __________. heat is given off by the water no heat

lys-0071 [83]

Answer: heat is given off by the water

Explanation:

Condensation can be defined as the process by which water vapors or steam in the atmosphere are converted into liquid water. It is the part of water cycle. The water form water bodies and terrestrial surfaces gets evaporated in the form of water vapors. These vapors rise in the upper atmospheric layers and aggregate to form the clouds when these vapors become heavy they fall down in the form of rain. Heat is given off in this process by the water vapors or steam to be converted in liquid.

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3 years ago

Curium – 245 is an alpha emitter. Write the equation for the nuclear reaction and identify the product nucleus.

BabaBlast [244]

Answer:

Please find the complete solution in the attached file.

Explanation:

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3 years ago

A sample of helium gas has a pressure of 1.20 atm at 22°c. at what celsius temperature will the helium reach a pressure of 2.00

sukhopar [10]

Gay-Lussac's law gives the relationship between pressure and temperature of a gas.
it states that for a fixed amount of gas of constant volume pressure is directly proportional to temperature.
P/T = k
where P - pressure, T - temperature and k - constant
$\frac{P1}{T1} = \frac{P2}{T2}$
where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation.
temperature should be in the kelvin scale,
T1 = 22 °C + 273 = 295 K
substituting the values in the equation
$\frac{1.20atm}{295 K} = \frac{2.00 atm}{T}$
T = 492 K
new temperature - 492 - 273 = 219 °C

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3 years ago

A stock solution of ammonia in water is 28 wt% NH3. The Formal Weight (FW) of NH3 is 17.03 g/mol). The solution density at room

weqwewe [10]

Answer:

[NH₃] = 14.7 mol/L

Explanation:

28 wt% is a type of concentration that indicates that 28 g of ammonia is contained in 100 g of solution.

Let's determine the amount of ammonia:

28 g . 1 mol / 17.03g = 1.64 moles of NH₃

You need to consider that, when you have density's data it is always referred to solution:

Mass of solution is 100 g, let's find out the volume

0.90 g/mL = 100 g /V

V = 100 g / 0.90mL/g → 111.1 mL

We convert the volume to L → 111.1 mL . 1 L/1000mL = 0.1111 L

mol/L = 1.64 mol/0.1111L → 14.7 M

mol/L = M → molarity a sort of concentration that indicates the moles of solute in 1L of solution

4 0

2 years ago