All categories

3 years ago

Why did Becquerel expose uranium crystals to sunlight in his initial experiment?

2 answers:

8 0

Below are the choices that can be found elsewhere:

<span>He wanted to show that warmed crystals radiate heat.
He wanted to show that the crystals emit X-rays.
He wanted to show that the crystals emit light after absorbing light.
He wanted to show that the crystals would become radioactive when they were exposed to sunlight.
</span>
The answer is "<span>He wanted to show that the crystals emit X-rays."</span>

erastovalidia [21]3 years ago

6 0

Answer:

The correct answer is that he wanted to show that the crystals emit X-rays.

Explanation:

At the time of the investigation of the newly discovered X-rays, Henri Becquerel studied salts of uranium that got influenced by light. He found that the salt of uranium continuously discharged penetrating radiation that is shown on a photographic plate. Afterward, Becquerel showed that the radiation discharged by the uranium salts exhibited some features of X-rays.

Thus, in his initial experiment, Becquerel exposed uranium crystals to sunlight in order to demonstrate that the crystals discharged X-rays that would illustrate the patterns witnessed on the photographic plates encountered with uranium salts.

You might be interested in

You have 16.0 g of some compound and you perform an experiment to remove all of the oxygen, 11.2 g of iron is left. What is the

Makovka662 [10]

The empirical formula of this compound is $Fe_2O_3$

<h3>Empirical formula </h3>

To calculate the empirical formula of a compound, the value of moles of each element is needed.

As we have the information of the mass value, we will use the molar mass expression, which corresponds to:

$MM_O = 16g/mol\\MM_Fe = 55.8g/mol$

$MM = \frac{m}{mol}$

$16 = \frac{4.8}{x}$

$x = 0.3mol$

$55.8=\frac{11.2}{x}\\x = 0.2$

As the value of the empirical formula must be an integer, simply multiply the two values by a common factor:

$O = 0.3 \times 10 = 3\\Fe = 0.2 \times 10 = 2$

$Fe_2O_3$

So, the empirical formula of this compound is $Fe_2O_3$ .

Learn more about empirical formula: brainly.com/question/1247523

3 0

2 years ago

The enthalpy of combustion of octane is -5470 kJ/mol. Octane (formulae C8H18) was used to heat some water in a copper can. The a

Virty [35]

Answer: 0.0009 moles of octane were used up.

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

Given mass of octane = 0.1 g

Molar mass of octane = 11.23 g/mol

Putting in the values we get:

$\text{Moles of octane}=\frac{0.1g}{114.23g/mol}=0.0009moles$

Thus 0.0009 moles of octane were used up.

7 0

4 years ago

* will mark you brainliest + 15 points **

devlian [24]

Answer: D. To decrease the total moles of gas in the system

Explanation:

Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.

This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

when the pressure is increased, , the volume will decrease according to Boyle's Law. Now, according to the Le-Chatelier's principle, the equilibrium will shift in the direction where decrease in pressure is taking place.

As the pressure is directly proportional to the number of moles of gas molecules. So, the equilibrium will shift in a direction where the total moles of gas are decreasing.

Thus the correct answer is to decrease the total moles of gas in the system.

3 0

3 years ago

Read 2 more answers

Which tool should Darla and Rob use to measure the force that pulls a car down the map

svetoff [14.1K]

Answer:

C. A Spring Scale

Explanation:

Using process of elimination, we can quickly decide that a stopwatch and a ruler will not be useful in measuring the force. This leaves us with either the spring scale or a balance scale. A balance scale is used to compare two weights, so this is eliminated. That leaves us with a spring scale. This is because we can attached the spring scale to the car and when we let it go, we can record the force. I hope this helps!

5 0

2 years ago

Meera added blue copper sulphate crystals to some water in a beaker.

professor190 [17]

Answer:

The solid crystals disappeared

Explanation:

When a soluble solid solute is added to water, the solid solute disappears after a little while. The disappearance of this solute indicates that the solute has been dissolved in water.

In this case, blue copper sulphate crystals are added to water, the blue crystals disappear leaving only a blue solution. The disappearance of these blue copper sulphate crystals indicates that the substance has dissolved in water.

7 0

4 years ago