These are called ocean or underwater trenches <span />
Explanation:
A chemical reaction is one in which a chemical change occurs.
During a chemical change;
- The process is irreversible
- New kinds of matter produced
- There is a change in mass
Based on these premise;
Baking cake batter is a chemical reaction because you cannot reverse the process
Shredding a paper is not a chemical reaction because no new kind of matter is produced.
Twisting of a metal wire is not a chemical reaction
Yellowing of newspaper in sunlight is a chemical change. The process cannot be reversed
Answer:
25.11 g.
Explanation:
- It is clear from the balanced equation:
<em>Ag₂O + 2HCl → 2AgCl + H₂O.</em>
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that 1.0 mole of Ag₂O reacts with 2.0 moles of HCl to produce 2.0 mole of AgCl and 1.0 moles of H₂O.
- 7.8 g of HCl reacts with excess Ag₂O. To calculate the no. of grams of Ag₂O that reacted, we should calculate the no. of moles of HCl:
<em>no. of moles of HCl = mass/atomic mass</em> = (7.9 g)/(36.46 g/mol) = <em>0.2167 mol.</em>
- From the balanced equation; every 1.0 mol of Ag₂O reacts with 2 moles of HCl.
∴ 0.2167 mol of HCl will react with (0.2617 mol / 2 = 0.1083 mol) of Ag₂O.
<em>∴ The mass of reacted Ag₂O = no. of moles x molar mas</em>s = (0.1083 mol)(231.735 g/mol) = <em>25.11 g.</em>
33.33 grams of CH4 would be formed from 25 g C.
C + 2H2 → CH4
from given reaction we can say that ,
2 moles of hydrogen is required for 1 mole of carbon and these will react to form 1 mole of methane.
atomic mass of Carbon = 12 gm
Molecular mass of H2 = 2(H)
= 2(1)
=2gm
moles = molecular mass / given mass
for C,
if 12 gm = 1 mole
then 25 gm = ? mole
=2.083 moles
1 mole of C will produce 1 moles of CH4
so, 2.083 moles of C also will produce 2.083 moles moles of CH4
molecular weight of methane= C+4(H)
= 12+4(1)
= 16 gm
amount of methane produced= moles × molecular mass
=2.083× 16
= 33.33 gm
Learn more about moles here...
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