Recapitulare masa molară Flashcards by Ice 21

Q

Mg + H2SO4 = ?

A

MgSO4 + H2 (se degajă)

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Q

Cum se notează masa molară?

A

M.

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Q

Cum se notează masa atomică?

A

A.

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Q

A(H) = ?

A

1

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Q

A(O) = ?

A

16

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Q

A(N) = ?

A

14

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Q

A(Mg) = ?

A

24

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Q

A(S) = ?

A

32

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Q

Calculează M(H2O).

A

M(H2O) = 2A(H) + A(O) = … = 18.

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Q

Calculează M(H2SO4).

A

M(H2SO4) = 2A(H) + A(S) + 4A(O) = … = 98

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Q

Calculează M(Ca(OH)2).

A

M(Ca(OH)2) = A(Ca) + 2A(O) + 2A(H) = … = 74

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Q

Cum se notează gruparea fosfat?

A

PO4.

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Q

Fosfat de calciu

A

Ca3(PO4)2.

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Q

Ce valență are gruparea fosfat (PO4)?

A

III.

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Q

Cum se notează numărul de moli?

A

niu = nr de moli

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Q

Cum se notează masa molară?

A

μ (miu).

Q

N(A) = numărul lui Avogrado = ?

A

6.022 * 10^23 molecule

Q

Cu cât este egal numărul de moli (niu)?

A

niu = m(g) / μ = N(molecule) / N(A)

Q

Cât cântărește un mol din orice substanță?

A

Cât masa molară a substanței și conține N(A) de molecule.

Q

NH3

A

Amoniac

Q

Amoniac

A

NH3