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ella [17]
3 years ago
14

A very hard substance is composed of atoms that make a network of strong covalent bonds, with no discrete molecules. It is a poo

r conductor of electricity
Chemistry
1 answer:
Tju [1.3M]3 years ago
8 0

Answer:

See explanation

Explanation:

The covalent network solid is composed of a network of strong covalent bonds rather than discreet molecules.

Covalent network solids are composed of atoms covalently bonded together into a three-dimensional network or layers of two-dimensional networks. Due to the strength of the covalent bonds, covalent network solids have high melting points(Khan Academy).

Examples of covalent network solids are Boron nitride, Silicon dioxide, diamond, graphite etc.

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Which statement about metamorphic and sedimentary rocks is true?
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<span>The answer is C. Earth movements can origin rocks to be intensely suppressed or clutched. As an outcome, the rocks are heated and put below unlimited pressure. They do not dissolve, but the minerals they cover are altered chemically, making metamorphic rocks.</span>
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How are ionic bonds formed? by the disintegration of one or more electrons by the sharing of one or more electrons between two a
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an ideal gas is at a pressure 1.00 x 10^5 N/m^2 and occupies a volume 11.00 m^3. If the gass is compressed to a volume of 1.00 m
bogdanovich [222]

Answer:

P_2=1.1x10^6Pa

Explanation:

Hello.

In this case, we can solve this problem by applying the Boyle's law which allows us to understand the pressure-volume behavior as a directly proportional relationship:

P_1V_1=P_2V_2

In such away, knowing the both the initial pressure and volume and the final volume, we can compute the final pressure as shown below:

P_2=\frac{P_1V_1}{V_2}

Consider that the given initial pressure is also equal to Pa:

P_2=\frac{1.00x10^5Pa*11.00m^3}{1.00m^3}\\ \\P_2=1.1x10^6Pa

Which stands for a pressure increase when volume decreases.

Regards.

4 0
3 years ago
Calculate the DH°rxn for the decomposition of calcium carbonate to calcium oxide and carbon dioxide. DH°f [CaCO3(s)] = –1206.9 k
Lena [83]

Answer:

ΔHrxn = 178.3 kJ/mol

Explanation:

Using Hess's law, you can obtain ΔHrxn from ΔHf of products and reactants, thus:

<em>Hess's law: </em>

ΔHrxn = <em>∑nΔHf products - ∑nΔHf reactants</em>

<em>Where n are moles of reaction</em>

<em> </em>

Thus, from the reaction:

CaCO₃(s) → CaO(s) + CO₂(g)

ΔHrxn = <em>ΔHf </em>CaO(s)<em> + ΔHf </em>CO₂(g)<em> - ΔHf </em>CaCO₃(s)

ΔHrxn = -635.1kJ/mol + (-393.5kJ/mol) - (-1206.9kJ/mol)

<em>ΔHrxn = 178.3 kJ/mol</em>

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Ice was heated at a constant rate. Eventually all ice changes to gas.
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Answer:

the change of occurs between200and750 is less than 100°C ans will be same and the answer is to calculate

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