CHEMISTRY MIDDLE SCHOOL

Which factor causes gas and dust to pull together during the first stage of star formation?

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Answer 1
Answer:

Answer:

B. Gravity on E2020                
Answer 2
Answer: Gravity pulls gas and dust together. A protostar forms as mass increases.

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Trejo reacts 5.0 moles of hydrochloric acid (HCI) with 1.5 moles of barium hydroxide (Ba(OH)2). Which reagent is the limiting reagent and which is in excess?

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the balanced equation for the above reaction is as follows
Ba(OH)₂ + 2HCl ----> BaCl₂ + 2H₂O
stoichiometry of Ba(OH)₂ to HCl is 1:2
number of Ba(OH)₂ moles - 1.5 mol
number of HCl moles - 5.0 mol
limiting reactant is fully consumed during the reaction and amount of product formed depends on amount of limiting reactant present 
excess reactant only a fraction of the amount present is used up in the reaction 
if Ba(OH)₂ is the limiting reactant 
if 1 mol of Ba(OH)₂ reacts with 2 mol of HCl 
then 1.5 mol of Ba(OH)₂  reacts with 2 x 1.5 = 3.0 mol of HCl
but 5.0 mol of HCl is present and only 3.0 mol is required 
therefore excess reagent is HCl and limiting reactant is Ba(OH)₂ 

what is the chemical formula for concentrated plutonium exploding and igniting hydrogen and how could it be stabilized? i'm not doing this IRL, so don't worry!

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Basically, an atomic bomb relying on pure fission like a plutonium bomb works by chain reactions. However, something must initiate the chain of reactions : that's where Hydrogen comes in:

the fission reaction of Uranium is U+n\rightarrow Sr+Xe+2n where n is a neutron. Hydrogen is basically a neutron and an electron; it's thus quite easy to start the reaction with hydrogen.

There is no known way to significantly reduce radioactive decay as far as I know (I might be wrong), or to turn radioactive plutonium into non-radioactive plutonium without tearing the molecules apart.

Can anyone please help answer this chemistry question?

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The chemical formula of benzene is C6H6, so it has six carbon (C) atoms and six hydrogen (H) atoms. Its chemical structure can be described as a hexagon ring with alternating double bonds, as shown in this illustration. The chemical structure of benzene shows that for each carbon atom, there is one hydrogen atom.
Please give me more details so I can help you

The melting point of table salt is 801 degrees celsius. is this a physical or chemical property?

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It is a Physical property because like water it changes into a ice cube but it can be melted into water or be turned back into an ice cube.

Okay,Please help guys.Is a plastic cup a heterogeneous OR homogeneous?Please help.Im doing it now...

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it should be homogeneous because it would be made of the same type of plastic. there may be small variations but they will be minute.

Some one please help me on this.

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The mould and cast fossil is Option B.

The carbon film fossil is Option C.

The Amber fossil is Option A.

The ice fossil is Option D.

Explanation:

Mould and cast fossils are formed when an organism or any organic object gets buried inside sediment and gets decomposed off, leaving an empty space between the sediments which are occupied by different minerals like carbon, calcium, silica etc. Thus, this mineral takes the shape of that decomposed object and stays for years.

The carbon film fossils are those fossils which take long time to form and are difficult to recover as well. They are formed when some organic substance gets very deep into Earth's surface and gets burned by the interior lava into only a thin layer of carbon.

The amber fossils are very common which are formed when the living organisms get stuck in plant resins and dies, which are enclosed into the plant's resin and are recovered thousands of years after.

The ice fossils aren't actually fossil because in very cold regions, the dead bodies often don't decompose but remain as it is for years. Thus the soft tissues are also recoverable after many years.

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