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3 years ago

At what temperature will a solid melt?

Chemistry

1 answer:

jolli1 [7]3 years ago

8 0

Answer:

A solid will melt at the temperature at which the kinetic energy breaks the inter-molecular attractions.

Explanation:

The melting point is the state at which "a substance changes its temperature from a solid to liquid". At the melting point temperature, there is an equilibrium between the both the solid and the liquid phase. When the solid particle is heated by increasing the temperature the particle in the solid vibrate quickly and it absorbs kinetic energy.

It leads to the breaking of the organisation of particle in between the solid and that leads to the melting of solid. Thus, at the melting point, the kinetic energy breaks the inter-molecular attractions.

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How many H2O molecules are in 183.2 grams of H20 gas?

jek_recluse [69]

Answer: There are $61.24 \times 10^{23}$ molecules present in 183.2 grams of $H_{2}O$ gas.

Explanation:

Given: Mass = 183.2 g

Number of moles is the mass of substance divided by its molar mass.

As molar mass of water is 18 g/mol. Therefore, moles of $H_{2}O$ are calculated as follows.

$Moles = \frac{mass}{molar mass}\\= \frac{183.2 g}{18 g/mol}\\= 10.17 mol$

According to the mole concept, there are $6.022 \times 10^{22}$ molecules present in one mole of a substance.

Hence, molecules present in 10.17 moles are calculated as follows.

$10.17 mol \times 6.022 \times 10^{23}\\= 61.24 \times 10^{23}$

Thus, we can conclude that there are $61.24 \times 10^{23}$ molecules present in 183.2 grams of $H_{2}O$ gas.

6 0

3 years ago

How are pure crystalline substances characterized?

hoa [83]

A pure crystalline substance is a substance with an almost perfect regular and periodic pattern in a solid state. This makes this type of substance a hard one compared to an amorphous substance which is soft because of the irregular pattern within.

4 0

3 years ago

Based on the chemical formula and state of matter, which of these substances will conduct electricity?

Sergeu [11.5K]

Answer:

CuSO4(aq)

Explanation:

The aqueous form of copper sulfate will conduct electricity.

The Solid form will not be a good conductor.

C₅H₁₂ will not conduct electricity

CO₂ will not conduct electricity

Copper sulfate is an ionic compound
In aqueous solutions or molten forms, ionic compounds can conduct an electric current using free mobile ions as carriers.
This way, they are electrolytes.
In solid state, the ions are arranged into a crystal lattice and will not conduct a current of electricity.

6 0

3 years ago

when 5.60g of an iron oxide is heated with carbon, 3.92g of iron is produced. calculate the empirical formula of the iron oxide

svetlana [45]

Answer: Fe2O3

Explanation:

5.60 g Iron Oxide

- 3.92 g Iron

===========

= 1.68 g Oxygen

Convert Fe and O to moles:

3.92 g Iron/55.85 = 0.0702 moles Fe

1.68 g Oxygen/16 = 0.105 moles O

The ratio of O to Fe is 1.50. There are 3/2 O for each Fe. Multiply by 2 to get whole numbers: 2Fe for every 3O: Fe2O3

5 0

2 years ago

TRUE or FALSE Nonpolar molecules only have nonpolar bonds.

Kitty [74]

Answer:

its false

Explanation:

srry if its wrong ;-;

4 0

2 years ago