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valkas [14]
3 years ago
10

Classify each of the following as a physical or a chemical change. Give

Chemistry
1 answer:
hjlf3 years ago
5 0

Answer:

a is a physical changes

b is physical changes

c is a Chemical change

d is a physical changes

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6 0
3 years ago
Help me with these questions.
Aloiza [94]
1) C
2) B
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3 years ago
If you weighed out 0.38 g of calcium and reacted it with an excess of hcl, how many moles of h2(g) would you expect to produce?
Hitman42 [59]
Answer is: 0,0095 mol of hydrogen gas will be produced in reaction.
Chemical reaction: Ca + 2HCl → CaCl₂ + H₂.
m(Ca) = 0,38 g.
n(H₂) = ?
n(Ca) = m(Ca) ÷ M(Ca).
n(Ca) = 0,38 g ÷ 40 g/mol
n(Ca) = 0,0095 mol.
from reaction: n(Ca) : n(H₂) = 1 : 1.
n(H₂) = n(Ca) = 0,0095 mol.
n - amount of substance.
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