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LekaFEV [45]
3 years ago
8

In Becquerel’s initial experiment, in which he exposed uranium salt crystals to sunlight, the photographic paper became exposed

even though it was shaded from the sun by a dark cloth. At first, how did Becquerel explain this result?
Chemistry
1 answer:
marshall27 [118]3 years ago
3 0
<span>In Becquerel’s initial experiment, in which he exposed uranium salt crystals to sunlight, the photographic paper became exposed even though it was shaded from the sun by a dark cloth. The explanation that he gave was that the crystals were emitting light without any external light source to stimulate or excite them. He called this phenomenon as "radioactivity'". Further, more and more experiments were done to analyse actually what happened between the crystals and the light</span>
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Suppose you titrate 80.0 mL of 2.00 M NaOH with 20.0 mL of 4.00 M HCl. What is the final concentration of OH− ions.
Likurg_2 [28]
Total volume = 80 mL + 20 mL = 100 mL = 0.10 L. 

NaOH + HCl ----> NaCl + H2O. 

0.08 L * 2.00 mol NaOH/L = 0.16 moles NaOH. 

0.02 L * 4.00 mol HCl/L = 0.08 moles HCl. 

0.16 - 0.08 = 0.08. There are 0.08 moles NaOH XS. 

0.08 moles NaOH produces 0.08 moles OH-. 

Concentration OH- = 0.08 moles / 0.10 L = 0.8 M.
4 0
3 years ago
Read 2 more answers
What is the speed of a wave with a frequency of 2 Hz and a wavelength of 87m (subject is science) pls answer fast
beks73 [17]

Answer:

43.5

Explanation:

Hope that helps

4 0
3 years ago
How many formula units make up 12.8 g of magnesium chloride (MgCl2)? Express the number of formula units numerically.
Cloud [144]
<h3>Answer:</h3>

8.09 × 10²² formula units

<h3>Explanation:</h3>

Mass of MgCl₂ is 12.8 g

Required to calculate the formula units

1 mole of a compound contains the Avogadro's number formula units

That is;

1 mole = 6.022 × 10²³ formula units

<h3>Step 1: Calculate the moles of MgCl₂ in 12.8 g </h3>

The molar mass of MgCl₂ is 95.211 g/mol

Number of moles = Mass ÷ molar mass

Moles of MgCl₂ = 12.8 g ÷ 95.211 g/mol

                          = 0.1344 mole

<h3>Step 2: Calculate the formula units of MgCl₂</h3>

1 mole =  6.022 × 10²³ formula units

Therefore;

Number of formula units = Moles × 6.022 × 10²³ formula units

                                    = 0.1344 mole × 6.022 × 10²³ formula units

                                     = 8.09 × 10²² formula units

Therefore, there are 8.09 × 10²² formula units in 12.8 g of MgCl₂

6 0
3 years ago
Which of the following statements is TRUE about the loose rocks on the surface
Ivan

Answer:B

Explanation:

3 0
3 years ago
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Why might an idea or hypothesis be discarded? A. If another scientist doesn't like it. B. If evidence also supports another hypo
vladimir1956 [14]

Answer:

C. If it is tested and the evidence does not support it.

Explanation:

A hypothesis is more less a scientific guess. Before such a guess or prediction is made, empirical observations and deductions are first made. It is from the result of the observations that a hypothesis statement is made.

For a hypothesis to become widely adopted and accepted, it must be testable within the limits of the experiment as described by the proposer. When subjected to test and it agrees, the status of a hypothesis can be upgraded.

If the hypothesis is tested and evidence contrasts the result being sort for, a hypothesis will be discarded.

7 0
3 years ago
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