CHEMISTRY HIGH SCHOOL

The atomic weight of an unknown element, in atomic units (amu), is approximately 20% less than that of calcium, the atomic weight of calcium is 40 amu. Which of the following best approximates the atomic weight, in amu, of the unknown element? (a) 8 (b) 20 (c) 32 (d) 48

Answers

Answer 1
Answer:

a) 8

40*20%

=40*20/100

=800/100

=8
Answer 2
Answer:

Final answer:

The atomic weight of the unknown element, which is approximately 20% less than calcium (40 amu), is estimated to be 32 amu.

Explanation:

The atomic weight of an unknown element is said to be approximately 20% less than that of calcium, which has an atomic weight of 40 atomic mass units (amu). To calculate the approximate atomic weight of the unknown element, take 20% of 40 (which is 8) and subtract it from 40. The result is 32 amu (40 - 8 = 32), so the correct answer is (c) 32.

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17. What standard reduction electrode has a half-cell potential of 0.00 V? Oxygen hydrogen
lithium
Fluorine

Answers

I believe Hydrogen is the standard reduction electrode that has a half-cell potential of 0.00 V. In electrochemical cell, an electric potential is created between two dissimilar metals. This potential is a measure of the energy per unit charge which is available from reduction or oxidation reactions to drive the reaction. 

OSHA standards appear in the ___________ and are then broken down into ____________.

Answers

OSHA standards appear in the Code of Federal Regulations (CFR) and was then broken down into two parts. It contains standards to ensure a comfortable and high quality research tools like the databases. These standards are to be strictly monitored to ensure  the safety of workers. 

The answer is

OSHA standards appear in the Code of Federal Regulations (CFR) and was then broken down into two parts.

The explanation:

OSHA standards are rules that describe the methods that employers must use to protect their employees from hazards. There are OSHA standards for Construction work, Maritime operations, and General Industry, which is the set that applies to most worksites. These standards limit the amount of hazardous chemicals workers can be exposed to, require the use of certain safe practices and equipment, and require employers to monitor hazards and keep records of workplace injuries and illnesses

It contains standards to ensure a comfortable and high quality research tools like the databases. These standards are to be strictly monitored to ensure  the safety of workers.

What is the difference between an orbit and an electron orbital

Answers

A planet's orbit around a star is an example of an orbit, which is the route taken by an object as it travels around another object under the effect of gravity. On the other hand, an electron orbital relates to the three-dimensional area surrounding an atom's nucleus where there is the greatest chance of encountering an electron.

What is Planet orbit?

The route a planet takes as it circles around a star or another astronomical object in space is known as its orbit. It is influenced by the planet's motion and the gravitational attraction of the object it circles. A planet's orbit might be elliptical, which means it is not a complete circle but rather has an elongated shape instead.

Astronomers use the study of planet orbits and their properties to better understand how celestial bodies move through space. An electron orbital is a probability distribution that shows where an electron is most likely to be found within an atom, whereas an orbit is a definite track that a celestial object travels as a result of gravity.

Therefore, a planet's orbit around a star is an example of an orbit, which is the route taken by an object as it travels around another object under the effect of gravity. On the other hand, an electron orbital relates to the three-dimensional area surrounding an atom's nucleus where there is the greatest chance of encountering an electron.

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orbital is a region of space around the nucleus where the probability of finding an electron is maximum and represents three dimensional motion of electron around nucleus. Also orbitals have different shapes where as orbit is circular in shape. an orbit is a trajectory with well defined position and momentum at all points and time.  Classical orbit is pretty easy to visualize, the Earth orbits the sun. An orbital is quantum mechanical.  Electrons posses wave properties and an orbital is the standing wave of a bound electron. 

One phosphorus, three chlorine, one oxygen

Answers

Phosphoryl chloride :

POCl3

hope this helps!.

Calculate the energy in joules and calories required to heat 25.0 g of water from 12.5C to 25.7C

Answers

the heat (Q) required to raise the temp of a substance is:Q=m∗Cp∗ΔT where m is the mass of the object (25.0g in this case), Cp is the specific heat capacity of the substance (for water Cp = 1.00cal/gC, or 4.18J/gC,
and Dt is the change in temp.
You'll have to solve this twice, once with the Cp in calories, and once with the Cp in joules.
1380.72 Joules

Which compound is soluble in water?(1) PbS (3) Na2S(2) BaS (4) Fe2S3

Answers

The compound Na2S or Sodium sulfide is soluble inwater. This compound is a water-soluble salt that give strong alkalinesolutions. When exposed to air or humidity this compound gives-off hydrogen sulfidethat smells almost the same as rotten eggs.

This chemical is commonly used in the pulp andpaper industry. Sodium sulfide compounds are usually used in chemicalphotography, textile bleaching, making dyes, and even detergents.

The other 3 compounds are non-soluble in water. Theircompositions are mostly metal in nature and require other process to transformthem into different compound forms. 

Answer;

(3) Na2S

Explanation;

  • All sodium salts are soluble in water. Therefore, sodium sulfide will be soluble in water.  
  • All sodium, potassium, and ammonium salts are soluble in water. The chlorides, bromides, and iodides of all metals except lead, silver, and mercury are also soluble in water.
  • The sulfides of all metals except barium, calcium, magnesium, sodium, potassium, and ammonium are insoluble in water.
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