When solid magnesium burns, it reacts with oxygen in the air to form a powder called magnesium oxide.

10 answers
Question:

When solid magnesium burns, it reacts with oxygen in the air to form a powder called magnesium oxide. a chemist performed this reaction in a lab and found that the mass of the magnesium oxide was greater than the mass of the magnesium. what is the reason behind this increase in mass?
a. the increase in the mass of the magnesium oxide was due to oxygen atoms in the air.
b. the increase in the mass of the magnesium oxide happened because oxygen is heavier than magnesium.
c. the increase in the mass of the magnesium oxide happened because magnesium is heavier than oxygen.
d. the increase in the mass of the magnesium oxide was due to magnesium atoms in the air.

Answers

A. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.

Explanation:

Burning occurs in the presence of oxygen. A chemical combination occurs between Mg and O in that the atom of magnesium attracts one another.

          Mg + O₂ → MgO

Starting with the magnesium, on reacting with oxygen a new compound forms. This is why there is mass increase in the MgO compared to the starting material.

A. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical equation for burning of magnesium in air is:

[tex]Mg(s)+O_2(g)\rightarrow 2MgO(s)[/tex]

When magnesium combines with oxygen, the mass of magnesium oxide formed will be same as the sum of masses of magnesium and oxygen.

Thus the increase in the mass of the magnesium oxide was due to oxygen atoms in the air.

Explanation:

Atomic size is defined as the distance between the nucleus and valence shell of an atom. Valence shell is the outermost shell of an atom.

When we move across a period in a periodic table then there will occur a decrease in atomic size of the atoms. But when we move across a group in a periodic table then there will occur an increase in atomic size of the atom.

Hydrogen is a period 1 element, oxygen is a period 2 element, chlorine is a period 3 element and bromine is a period 4 element.

Therefore, given elements are arranged in order of increasing atomic size as follows.

                             H < O < Cl < Br  

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Explanation:

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Ribosomes and golgi bodies will be most numerous in the cells of salivary glands.

Explanation:

Ribosomes are the cell organelles that are associated with the production of proteins by the process of translation from mRNAs. Golgi bodies are the organelles that are associated with the secretion of the secretory vesicles outside the cells.

Salivary amylase is an enzyme and all the enzymes are proteins. They are needed to be translated by ribosomes from the mRNAs. And as they are produced, they are needed to be secreted outside the cell. So golgi bodies and ribosomes are found most numerously inside the salivary gland cells.

The president needed to experiment with the impact of atomic weapons on a military target.

Explanation:

A land invasion would have created more casualties.

American officials believed the Japanese would fight up to the point of annihilation.  

Many Americans thought that the Japanese would fight until the point of complete annihilation.

One option can be a full military campaign based on sending soldiers to take Japanese territory. One advantage is that the number of killed civilians would be drastically lower while another would be that nuclear weaponry would not be used and would not destroy the environment. Disadvantage would be the high amount of soldier casualties and another can be possibly a very lengthy war effort.

Another option could be a complete blockade of Japan. Since it's an island, it would be possible to blockade it from all sides and wait for Japanese people to surrender since they wouldn't be able to sustain for long without importing things. One advantage would be preventing the death of Japanese civilians and preventing deaths of US troops. Disadvantages would be that might actually endure hardships and still wouldn't surrender, and another could be that they might fight like guerrillas and attack ships and American troops

Another option can be an allied assault in which the US could attack together with Soviets and split Japan like Germany. Advantage would be reduced amount of killed Japanese civilians and reduced amount of killed American troops. The disadvantage could be that a split Japan would be problematic like split Germany was because of Communism, and another could be that it would enable soviets to spread their influence even more throughout Asia

Fourth option could be having a demonstration of the power of nuclear weaponry somewhere safe. The United States could show what they are capable of in order to scare Japan into surrender. One advantage is that Japanese civilians would not be harmed and another can be that they would still show the world how strong the United States bombs are. One disadvantage could be that Japanese people might still not surrender since there were many who wanted to stay in the war even after the two nukes, and another disadvantage could be that Japan might began preparing for nuclear warfare since they would now know what awaits them

The best possible option could be as a recommendation the naval blockade. If a naval blockade was combined with bombardment of strategic military areas then Japan would inevitably surrender even though it would take a few months at least. It would cost a lot but it would save the lives of many people who didn't have to suffer because of their government.

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