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Kamila [148]
3 years ago
11

Question 1 please my exam is tmr

Chemistry
2 answers:
evablogger [386]3 years ago
6 0

Answer:

When a solid is heated, then it's intermolecular force of attraction decreases as the molecules try to move randomly and expands the solid.

Anuta_ua [19.1K]3 years ago
3 0
When a solid is heated, its atoms vibrate faster about their fixed points. The relative increase in the size of solids when heated is therefore small. Liquids expand for the same reason, but because the bonds between separate molecules are usually less tight they expand more than solids.
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13. How many moles of sodium hydroxide are needed to neutralize 50grams of sulfuric acid?
Phoenix [80]

Answer:

1.02mole

Explanation:

The reaction equation is given as:

     2NaOH  +  H₂SO₄ →  Na₂SO₄  + 2H₂O

Given:

Mass of H₂SO₄  = 50g

Unknown:

Number of moles of NaOH = ?

Solution:

To solve this problem, we first find the number of moles of the acid given;

  Number of moles  = \frac{mass}{molar mass}

Molar mass of H₂SO₄ = 2(1) + 32 + 4(16)  = 98g/mol

Now;

   Number of moles = \frac{50}{98}   = 0.51mole

From the balanced reaction equation:

       1 mole of H₂SO₄ will be neutralized by 2 mole of NaOH

     0.51 mole of H₂SO₄ will be neutralized by 2 x 0.51  = 1.02mole of NaOH

6 0
3 years ago
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