All categories

3 years ago

Please help me with this question!

Chemistry

1 answer:

Dvinal [7]3 years ago

8 0

I believe that it is (a.) just because it talks about solid to liquid.

You might be interested in

Interstate 285 around Atlanta is 63.98 mi and is about 80. ft across both directions of traffic. If there are 2.5 inches of snow

Burka [1]

12 in = 1 ft. I hope u find this helpful

7 0

3 years ago

You have a 5-liter container with 2.00 x 1023 molecules of ammonia gas (NH3) at STP. How many molecules of argon gas (Ar) are in

svet-max [94.6K]

Answer:

C. 2.00 x 1023 molecules

Explanation:

Given , the pressure , volume and temperature are same in both cases.

From the ideal gas equation,

P V = n R T

where n= no. of moles = given weight ÷ atomic weight

And 6.023 x 10^23 molecules of ammonia(NH3), weigh 17g ( 14 + 3(1 ))

So we have

P V = ((2.00 x 10^23)/(6.023 x 10^23)) x R T

Similarly, say n molecules of argon gas (Ar) are in an identical container.

So the gas equation would be

P V = ( n / 6.023 x 10^23 ) x R T

Because, atomic weight of Argon is beared by 6.023 x 10^23 molecules.

dividing these two equations, we get

n = 2.00 x 10^23 molecules

8 0

3 years ago

According to de Broglie, which of these objects does not have a wavelength?

polet [3.4K]

Answer: Option D is correct.

Explanation: Equation given by de Broglie is:

$\lambda =\frac{h}{mv}$

where, $\lambda$ = wavelength of the particle

h = Planck's constant

m = mass of the particle

v = velocity of the particle

In option A, football will have some mass and is moving with a velocity of 25 m/s, hence it will have some wavelength.

In Option B, unladen swallow also have some mass and is moving with a velocity of 38 km/hr, hence it will also have some wavelength.

In Option C, a person has some mass and is running with a velocity of 7 m/hr, hence it will also have some wavelength.

As, the momentum of these particles are large, therefore the wavelength will be of small magnitude and hence, is not observable.

From the above, it is clearly visible that all the options are having some wavelength, so option D is correct.

7 0

3 years ago

In laboratory experiment, a NOVDEC Student was

Ede4ka [16]

Answer:

i. Molar mass of glucose = 180 g/mol

ii. Amount of glucose = 0.5 mole

Explanation:

The volume of the glucose solution to be prepared = 500 $cm^3$

Molarity of the glucose solution to be prepared = 1 M

i. Molar mass of glucose ( $C_1_2H_6O_6$ ) = (6 × 12) + (12 × 1) + (6 × 16) = 180 g/mol

ii. mole = molarity x volume. Hence;

amount (in moles) of the glucose solution to be prepared

= 1 x 500/1000 = 0.5 mole

3 0

3 years ago

Which solid will be more soluble in water, the one with the larger lattice energy or the one with the smaller lattice energy? as

grandymaker [24]

Lattice energy is the amount of energy expelled when the solid is disintegrated into ions. For example, the solid is Sodium Chloride. In ionic form, that would consist of sodium and chlorine ions.The solid with a smaller lattice energy would be easily disrupted, hence, when a solvent is incorporated, the solid becomes solvated ions.

7 0

4 years ago