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3 years ago

Copper is which type of solid? molecular solid ionic solid covalent atomic solid metallic atomic solid

Chemistry

1 answer:

elena55 [62]3 years ago

5 0

It's metallic atomic solid as it is a kind of metal .

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How are viscosity and flow rate similar

Stels [109]

Answer: Flow rate is inversely proportional to viscosity.

Explanation: The relation is called Poiseuille's law, which describes the smooth flow of a fluid along a tube.

7 0

3 years ago

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An icecube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone

klasskru [66]

Yes because it’s evaporated

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2 years ago

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The mean for a set of measurements is 4.17 and the standard deviation is 0.14. To show 95% confidence limits, we can write the r

Black_prince [1.1K]

Answer:

The 95% confidence level is

$4.17 \pm 0.2744$

Explanation:

If we can apply the central limit theorem, we can approximate this distribution to a normal distribution.

The confidence level (for n=1) is defined as

$X\pm \frac{z*\sigma}{\sqrt{n}}=X\pm z*\sigma$

For a 95% confidence interval, according to the normal distribution, z=1.96.

Then we have:

$X\pm z*\sigma=4.17 \pm 1.96*0.14=4.17 \pm 0.2744$

6 0

3 years ago

The standard enthalpy of combustion of naphthalene is –5157 kj mol-1. calculate its standard enthalpy of formation. (use data in

Artemon [7]

The combustion of naphthalene is given as:

C10H8 (s) + 12 O2 (g) --> 10CO2 (g) + 4 H2O (l)

Enthalpy of combustion ΔH = -5157 kJ/mol

Now, the enthalpy change of a reaction is given

ΔH = ∑nΔHf (products) - ∑nΔHf (reactants)

where n = number of moles

ΔHf = enthalpy of formation

Therefore,

ΔH = [10*ΔHf(CO2) + 4*ΔHf(H2O)] - [1*ΔHf(C10H8) + 12*O2]

-5157 = [10*(-393.5) + 4*(285.83)] - [ΔHf(C10H8) + 12*(0)]

ΔHf(C10H8) = 78.68 kJ/mol

4 0

4 years ago

what is the mole fraction of neon in a mixture that contains 0.628 g of helium, 11.491 g of neon, and 7.613 g of argon?

VMariaS [17]

Answer:

0.2

Explanation:

Given parameters:

Mass of helium = 0.628g

Mass of neon = 11.491g

Mass of argon = 7.613g

Unknown:

Mole fraction of neon = ?

Solution:

The mole fraction of an element is the number of moles of that element to the total number of moles in the gas mixture.

We need to calculate the number of moles of each element first;

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

Molar mass of Helium = 4g/mol

Molar mass of Neon = 20g/mol

Molar mass of Argon = 40g/mol

Number of moles of He = $\frac{0.628}{4}$ = 0.16moles

Number of moles of Ne = $\frac{11.491}{20}$ = 0.58moles

Number of moles of Ar = $\frac{7.613}{40}$ = 0.19moles

Total number of moles = 0.16moles + 0.58moles + 0.19moles = 0.93moles

Mole fraction Neon = $\frac{0.19}{0.93}$ = 0.2

4 0

3 years ago