CHEMISTRY HIGH SCHOOL

Phosphorus is most abundant in the

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Answer 1
Answer: Phosphorus is about 0.099% in the Earth's crust. Among the elements in Group 15 in the periodic table,  it is the most abundant. Also, it is the most dispersed element in nature. However, it does not occur as a free element. It occurs as a compound.

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During photosynthesis, sunlight shining on a plant is absorbed. Through several chemical reactions, the plant produces sugar, a high-energy compound, from simpler substances. What energy transformation occurs during this process? A...thermal energy to chemical energy B....electromagnetic energy to chemical energy C....kinetic energy to potential energy D...potential energy to chemical energy
Which of the following is not a valid conversion factor? 1/100 centimeter 1mL/1cm^3 1kilometer/1000 meters 1meter/10 milimeters
How many molecules are in 2.6 grams H4C
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Solve and show work. Li2S + 2 HNO3 --> 2 LiNO3 + H2S (a) Calculate the mass of lithium sulfide that will react with 250 mL of 0.65 M nitric acid (b) How many mL of 9.6 M HNO3 are needed to make 250 mL of 0.65 M HNO3 solution? (c) How many grams of nitric acid are needed to make 750 mL of 9.6 M HNO3.

A cell created by cloning is genetically A identical to its parent. B identical to its stem cell. C unique because it is a mixture of DNA. D half like its father and half like its mother.

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Answer: Identical to its parent.

Explanation:

The cloning can be defined as the process by which genetically identical individuals of an organism is produced either artificially or naturally.

The cloning in case of biotechnology refers to the creating the clones of organisms or copies of cells or DNA of the parent cell that is being used in the process.

The parent cell is cloned and numerous copies is made just like that of the asexual reproduction in the nature.

Example: Dolly the sheep.

A cell created by cloning is genetically identical to its parent. The correct answer is option A.

DNA (deoxyribonucleic acid) is a molecule that carries genetic information and instructions for the development and function of all living organisms.

When a cell is cloned, it is essentially a copy of the original cell. This means that the genetic material in the cloned cell is identical to the genetic material in the original cell.

  • The DNA in the cloned cell is exactly the same as the DNA in the parent cell, and there is no mixing or recombination of DNA from different sources.

In conclusion, the correct answer is A) identical to its parent. A cell created by cloning is genetically identical to its parent.

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Which of the following compounds contains both ionic and covalent bonds?Select one:
a. NH3
b. NaNO3
c. CH3OH
d. AlCl3

Answers

Answer:

d. AlCl3

Explanation:

In AlCl₃ each Al³⁺ cation is surrounded by three Cl⁻ anion. Al³⁺ has a small ionic radius giving it a high charge density whereas Cl⁻ has a large ionic radius, low charge, and easily polarizable. Al³⁺ pulls one electron from each of the three Cl⁻ ion thus giving the Al-Cl bond a covalent character.  
NaNO3 because Na is a cation allowing it to bond with anions which are NO3. NO3 is a covalent compound because nitrogen and oxygen are sharing electrons when they bond; thus making a covalent bond

Classify wine and beef stew as homogeneous or heterogeneous.

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Wine is a homogenous mixture while beef stew is a heterogeneous mixture as it has components which are clearly visible.

What are  the heterogeneous mixtures?

Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.

As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.

Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.

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Wine is a homogeneous mixture. Homogeneous means same throughout. Most things with water are homogeneous. You only see the wine in this mixture.
Beef Stew is heterogeneous mixture. You can see the beef AND stew, it is different throughout. Not the same. Most heterogeneous mixtures are chunky or lumpy.

Which bond is most polar? A) N -H
B) C -H
C) O -H
D) H -H
Can anyone explain this one?

Answers

 A) N is more polar because of it electron negativity charge ex. N electron negativity charge is 3.0 and H is 2.1 
 B) C is more polar...electron negativity for C is 2.5 AND H is 2.1 
 C)O is more polar dues to it electron negativity charge being greater that hydrogen 
 D)H and H are both non polar because they cancel each other out due to the face the both share the electron negativity evenly 
 C .. ectronegativity values for each of the atoms but if you didn't know these you can just look at your periodic table and see where they are in relation to each other

After the food has been chewed and lubricated, it is pushed by the tongue into the___________.larynx
pharynx
stomach

Answers

The answer is pharynx

Pharynx is cone-shaped passageway leading from the oral and nasal cavities in the head to the esophagus and larynx. The pharynx chamber serves both respiratory and digestive functions

After the food has been chewed and lubricated, it is pushed by the tongue into the Pharynx

What is the answer to this question?

Answers

I think it's 4 but I am not even 50% sure... But I think that is the answer..
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