Which type of reaction occurs in the following? 2HgO(s) 2Hg(l) + O2(g)A.a decomposition reaction in which a metal is reduced
B.an acid-base neutralization reaction to produce oxygen gas
C.a displacement reaction involving two metals
D.a combustion reaction involving burning a metal in oxygen

Answers

Answer 1
Answer:

In this reaction, reactant HgO decomposed into more than one products and reaction is called decomposition. Hg in HgO has oxidation number of +2 whereas oxidation number of Hg in product side is zero( zero because Hg is in its elemental form) so Hg is reduced. Hence option A is correct.

what is decomposition ?

Decomposition can be defined as the  “to break down” of complex substance or organic matter into a simpler inorganic matter.

It is one of the essential processes of the ecosystem, decomposition is a metabolic process which take up raw materials in the form of complex compounds, processing it and then converting it into simpler compounds.

some of the Bacteria, fungi and a few other microorganisms are involve in the process of decomposition as feed on dead organisms to survive.

in this process decaying and dead animals and plants serve as the raw materials undergo breakdown process and produces nutrients, carbon dioxide, and water;  Microbes  which involve in this process collectively known as saprophytes.

For more details regarding decomposition, visit

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Answer 2
Answer: In this reaction, reactant HgO decomposes into more than one products hence reaction is called decomposition.Hg in HgO has oxidation number of +2 whereas oxidation number of Hg in product side is zero( zero because Hg is in its elemental form) so Hg is reduced. Hence A is correct option. 

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What is the formula for carbon tetrachloride?a. CCl
b. CCl2
c. CCl3
d. CCl4

Answers

The formula for carbon tetrachloride is CCl4. The answer is letetr D. The rest of the choices do not answer the question above.

A reaction starts with 20.0 grams of lithium hydroxide (LiOH) and produces 31.0 grams of lithium chloride (LiCl), what is the percent yield of lithium chloride (LiCl)? *LiOH + KCl - LiCl + KOH

A) 64.5%
B) 88.6%
C) 81.5%
D) 92.8%

Answers

Answer:

B) 88.6%

Explanation:

Percent yield equals actual yield divided by theoretical yield

actual yield is 31.0g

theoretical yield is 35g

percent yield was 88.57 which rounds up to 88.6%

How much of a 5.0 g sample of strontium-90 will remain after 87 years?

Answers

Since radioacitive decay fallows first order kinetics you can use the equation lnA(t)=-kt+lnA₀.  
A₀=the initial amount of sample
A(t)=the amount of sample after t years
t=time
k=rate constant

First you need to solve for the rate constant (k) to get the equation
-((lnA(t)-lnA(0))/t=k which can simplify into k=-ln(A(t)/A₀)/t which can then be simplified further to ln(A₀/A(t))/t=k.   I think the half life of strontium-90 is 28.8 years which means that when t=28.8 years, A(t) is going to equal 1/2 of A₀ and you can make the equation k=ln2/28.8 to get k=0.02408.

Now you need to solve for A(t) in the equation ln(A(t))=-kt+lnA₀ to get A(t)=e^(-kt+lnA₀) which simplifies to A(t)=A₀e^-kt.  When you plug t=87, A₀=5g, and k=0.02408 into that equation you should get 0.616g.

Therefore after 87 years you will have 0.616g of strontium-90 if you started with a 5g sample.

I hope this helps.  Let me know in the comments if anything is unclear.

Which scientist provided a foundation for John Dalton’s work on the atomic structure?

Answers

The scientist that provided a foundation for John Dalton’s work on the atomic structure is Sir Joseph John Thompson or J.J. Thompson. It was theorized after the discovery that electrons are present in the atom. In this model, the atom is composed mainly of electrons. It was describe as plum pudding because the electrons are dispersed within the atom. 

How do the bonds within AND between a water molecule affect the properties of water?

Answers

Water is a polar molecule, meaning the covalent bonds in it share electrons unequally. They spend more time around the oxygen, making it positive and the hydrogens negative. This helps water stick to surfaces, a property called adhesion. The hydrogens of one molecule are also attracted to the oxygens of another. This is called cohesion, and it helps water form droplets

What types of elements- metals,nonmetals, or metalloids require
the most energy to remove an
electron?
Why do these elements have a higher ionization energy?

Answers

Answer:

Noble gases

Explanation:

The noble gases are non-metals that requires the highest amount of energy to remove an electron from their shells.

The reason for this difficult is that their electronic configuration confers a stable configuration them.

  • The ionization energy is the energy required to remove the most loosely held electrons in an atom.
  • Due to the special stability of noble gases, it is very difficult to remove electrons from an atom of noble gases.