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laila [671]
3 years ago
10

After completing an experiment to determine gravimetrically the percentage of water in a hydrate, a student reported a value of

38 percent. The correct value for the percentage of water in the hydrate is 51 percent. Which of the following is the most likely explanation for this difference.A. Strong initial heating caused some of the hydrate sample to spatter out of the crucibleB. The dehydrated sample absorbed moisture after heatingC. The amount of the hydrate sample used was too smallD. The crucible was not heated to constant mass before useE. Excess heating caused the dehydration sample to decompose
Chemistry
1 answer:
zzz [600]3 years ago
4 0

Answer:

A. Strong initial heating caused some of the hydrate sample to spatter out of the crucible.

Explanation:

Hi

The percentage of water in the sample is lower than expected.

A. Strong initial heating caused some of the hydrate sample to spatter out of the crucible:

If part of the sample is splashed from the crucible the mass of water detected will be less.

B. The dehydrated sample absorbed moisture after heating:

If the sample absorbs water after heating the percentage of water would be higher than expected.

C. The amount of the hydrate sample used was too small:

Depending on the sample size, different procedures can be chosen for analysis.

D. The crucible was not heated to constant mass before use:

In many occasions the crucible is heated next to the sample and not in previous form.

E. Excess heating caused the dehydration sample to decompose:

If the sample decomposes during heating, the analysis should be discarded.

success with your homework

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a satellite with a mass of 100kg fires it’s engines to increase velocity, thereby increasing the size of its orbit around the ea
butalik [34]

The approximate change in gravitational force from Earth as a result of the change in radius of the satellite's orbit is -95.07N

<h3>What is the universal law of gravitation?</h3>

The universal law of gravitation states that the particle of matter in the universe attracts another particle with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

It is written thus;

F = G M_1M_2÷ r^2

Where

F = Gravitational force

G = Gravitational constant

M_1 and M_2 are the masses of the object

r = radius

How to calculate the gravitational force

Formula:

F = G M_1M_2÷ r^2

Given M_1 = 100kg

M_2 = 5.97 x10^{24} kg

r = 7.5 x 10^6 m

G =  6.67 x 10^{-11} N-m²/kg²

For the first orbit, substitute the values

F = 6.67 x 10^{-11}× 150 ×  5.97 x 10^{24} ÷ (7.5 x10^6)^2

F = 5.95 × 10^{16} ÷ 56.25 × 10^{12}=  105.77 N

For the second orbit of radius 7.7 x 10^6 m

F =  6.67 x 10^{-11} × 100 ×  5.97 x 10^{24} ÷ (7.7 x 10^6)2

F = 5.95 × 10^{16}÷ 59.25 × 10^{12} = 200. 84 N

The approximate change = 105. 77 - 200. 84 = -95.07N

Hence, the approximate change in gravitational force from Earth as a result of the change in radius of the satellite's orbit is -95.07N

Learn more about gravitational force here:

brainly.com/question/19050897

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4 0
2 years ago
Heat is added to a 200.-gram sample of H2O(s) to melt the sample at 0°C. Then the resulting H2O ( ) is heated to a final tempera
nikklg [1K]
The heat is added to 200g ice at 0ºC to make the ice become water. there is no increase in temperature. the heat added is equal to the number of moles of ice melted x molar heat of fusion of ice, 6.01kJ/mole. 

<span>200g / 18g/mole = 11.11moles ice </span>
<span>11.11moles x 6.01kJ/mole = 66.78 kJ heat just to melt the ice to water </span>
<span>if you are just looking for the heat to melt the sample of ice, this is where you stop. </span>

<span>if you need to determine the heat to melt the ice AND raise the temperature, this is what you require </span>
<span>the second phase is raising the temperature of the water to 65ºC. this is equal to the mass of the water x specific heat of water x change in temperature </span>
<span>200g x 4.187J/g-ºC x 65ºC = 54431J or 54.431kJ energy to raise the water from 0ºC to 65ºC </span>

<span>the total heat required to melt the ice and then raise the temperature to 65ºC: </span>
<span>66.78kJ + 54.431kJ = 121.21kJ heat</span>
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Explanation:

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I think it’s C.1/2 because the child could get five fingers like his mother or six fingers like his dad
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