CHEMISTRY HIGH SCHOOL

How many atoms are in 3.75 moles of Phosphorus? A) 136 atoms
B) 35 atoms
C) 6.23x10^-24 atoms
D) 2.26x10^24 atoms

Answers

Answer 1
Answer: there are 6.022145E+23 atom per one mole.

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Hich element is likely to be the most brittle?a. selenium
b. cobalt
c. platinum
d. zinc

Answers

Answer:

a. Selenium

Explanation:

Hello,

Selenium is a crystalline non-metallic element that has variable properties depending on how it is prepared, but they are all hard solids. Zinc is less brittle than selenium since it has stronger metallic properties. On the other hand, cobalt and platinum are strong metals that are far away to be brittle.

Best regards.
The most brittle one is selenium!

if burning wood causes the energy of the surroundings to increase by 12,000J what is the change in energy of the wood

Answers

Due to the law of conservation of energy we know that the energy that heated the surrounding had to have come from the reaction which means that the wood (with oxygen since this is combustion) lost 12000J. The change in energy for the wood is negative. I hope this helps. Let me know if anything is unclear.

In the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide and water, which of the following is a reactant?a. sucrose
c. water
b. carbon dioxide
d. heat

Answers

A reaction in which the reactants splits to produce two or more products is called a decomposition reaction.

It can be represented as:

XY ------> X + Y

The correct answer is:

Option A. Sucrose

This can be explained as:

  • The reaction for the decomposition of sucrose is given as:

C₁₂H₂₂O₁₁ (Sucrose)  + 12 O₂ -----> 12 CO₂ (Carbon dioxide)  +  11 H₂O (water)

  • The reactant of a reaction is written generally on the left side of the reaction.

  • The reactant is a substance that reacts and undergoes chemical changes to form products.

Therefore, sucrose is the reactant.

To learn more about decomposition reaction, reactants and products follow the link:

brainly.com/question/2348108
in the chemical reaction in which sucrose is heated and decomposes to form carbon dioxide  and water a. sucrose is a reactant

Describe the difference between chronic and acute exposure.

Answers

"Radiation exposure might be short-term or long-lasting. First, think of a medical x-ray exposure where the time of exposure is short—the machine is on and off within a very short period of time. Or think about radioactive materials that naturally occur in our soils; they present us with small amounts of radiation exposure that occur over our lifetime. Depending on the source, time of an exposure can vary—in some cases, the time will be very short, seconds or less, and in other cases it will be occurring continuously over our lifetime. Keep in mind that being exposed to radiation in a short period of time or over a long period of time is no indication of the total radiation dose and, thus, the possible health effects that may occur."

Answer: chronic is long term and severe while acute lasts for a short amount of time.

What is presipitation?

Answers

Precipitation is the prcross by which rain, sleet, snow, etc, is released from the clouds.

A radioactive nuclide is used to detect eye tumors. An atom of this radionuclide contains 15 protons, 15 electrons, and 17 neutrons. Which is symbol of this radionuclide?

Answers

The answer is phosphorus-32.

We know that the atom contains 15 protons, 15 electrons, and 17 neutrons.
To conclude of which element this radionuclide is, we need to know an atomic number of the element. The atomic number of the element is the number of proton in the nucleus of the atom. If the number of protons is 15, then the atomic number is 15. The element with atomic number 15 is phosphorus (according to the periodic table).
To conclude which phosphorus isotope this radionuclide is we need to know the mass number of the element. The mass number of the element is the sum of the number of protons and number of neutrons in the nucleus of the atom. If the number of protons is 15 and the number of neutrons is 17, then the mass number is 17 + 15 = 32.
Thus, this radionuclide is phosphorus-32.
Knowing that the number of protons of an element is equivalent to its atomic number, it can be determined from the periodic table of elements that this radionuclide is phosphorus. Since the number of its neutrons is 17, it can also be determined that its atomic mass is n + p = 15 + 17 = 32. This means the isotope is phosphorus-32.
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