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pantera1 [17]
3 years ago
15

Select the two elements isolated by the Curies.

Chemistry
2 answers:
ss7ja [257]3 years ago
7 0

The right options are; radium and polonium

The two elements isolated by the Curies are; radium and polonium.

Marie and Pierre Curie discovered the existence of the elements radium and polonium when they conducted pioneering research on radioactivity. They successfully removed radioactive radium salts from the mineral pitchblende in their laboratory. Marie Curie also discovered that the potential to emit radiation does not rely on the structural arrangement of the atoms in a molecule.

Mkey [24]3 years ago
5 0
Radium and polonium is the answer to this question. I hope I helped out!
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A) Identical

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3 years ago
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Compare the root mean square speeds of O2 and UF6 at 65 degree Celsius
gayaneshka [121]
<h3>Answer:</h3>

The root mean square speeds of O₂ and UF₆ is 513m/s and 155 m/s respectively.

<h3>Solution and Explanation:</h3>
  • To find how fast molecules or particles of gases move at a particular temperature, the root  mean square speed is calculated.
  • Root mean square speed of a gas is calculated by using the formula;

       Root mean square=\sqrt{ \frac{3RT}{M}

       Where R is the molar gas constant, T is the temperature and M is the molar mass of gas in Kg.

<h3>Step 1: Root mean square speed from O₂</h3>

Molar mass of Oxygen is 32.0 g/mol or 0.032 kg/mol

Temperature = 65 degrees Celsius or 338 K

Molar gas constant = 8.3145 J/k.mol

Root mean square speed = \sqrt\frac{(3)(8.3145)(338K)}{0.032}

                                        = 513.289 m/s

<h3>Step 2: Root mean square speed of UF₆   </h3>

The molar mass of UF₆ is 352 g/mol or 0.352 kg/mol        

Root mean square speed = \sqrt\frac{(3)(8.3145)(338K)}{0.352}

                                                 = 154.762m/s

Therefore; the root mean square speeds of O₂ and UF₆ is 513m/s and 155 m/s respectively.

7 0
3 years ago
Part b select the ester that is formed when propanoic acid reacts with isopropyl alcohol in the presence of heat and an acid cat
Otrada [13]
<span>The ester that is formed by combining propanioc acid with isopropyl alcohol, using heat and an acid catalyst is isopropyl propanoate.</span>
7 0
4 years ago
How are water-based solutions formed?
drek231 [11]

Answer:

D. Solutions are formed when the water’s polar molecules separate the polar molecules of an ionic or molecular compound.

Explanation:

Solutions are homogeneous mixtures formed by interaction between solutes and solvents.

Water based solutions have water as the solvents and mostly ionic and molecular compounds as their solutes.

Water is a polar solvent that is capable of dissolving many compounds by hydrating them. The molecules of water surrounds the solute and forces them  to separate.

6 0
3 years ago
1. What temperature is equivalent to 32°F?
Vlad1618 [11]

Answer:

0 Celsius

Explanation:

its 0 degrees C

4 0
3 years ago
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