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2 years ago

What phrase Best defines energy

Chemistry

2 answers:

belka [17]2 years ago

5 0

Answer:

the ability to do work.

Explanation:

juin [17]2 years ago

4 0

Energy is the required strength and capacity for physical and mental functions. This not only applies for doing work, but it also applies to the simplest actions such as getting out of bed (that’s an example of physical strength) and strategizing about something (that’s mental strength).

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How many electrons are in the 4p orbital does Br possesses?

Klio2033 [76]

Answer:

5 electron

It contains 6 electrons in 2p orbital, 6 electrons in 3p orbital and 5 electron in 4p orbital.

5 0

4 years ago

Calculate ∆U (the change in internal energy) for a system on which 850.00

Illusion [34]

Answer:

The heat gain by the system,

−

250

The work done on the system ,

−

500

The First Law of Thermodynamics state that

−

750

Explanation:

6 0

3 years ago

Which property below will be the best one to use to most accurately identify a pure substance because it is unique to each pure

Lisa [10]

<h3><em>Answer: Physical properties of a substance are characteristics that can be observed without altering the identity of the substance. Color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.</em></h3><h3><em>A pure substance has a definite and constant composition — like salt or sugar. A pure substance can be either an element or a compound, but the composition of a pure substance doesn't vary.</em></h3>

6 0

3 years ago

The thallium (present as Tl2SO4) in a 9.486-g pesticide sample was precipitated as thallium(I) iodide. Calculate the mass percen

tino4ka555 [31]

Answer: The mass percentage of $Tl_2SO_4$ is 5.86%

Explanation:

To calculate the mass percentage of $Tl_2SO_4$ in the sample it is necessary to know the mass of the solute ( $Tl_2SO_4$ in this case), and the mass of the solution (pesticide sample, whose mass is explicit in the letter of the problem).

To calculate the mass of the solute, we must take the mass of the $TlI$ precipitate. We can establish a relation between the mass of $TlI$ and $Tl_2SO_4$ using the stoichiometry of the compounds:

$moles\ of\ TlI = \frac{0.1824 g}{331.27\frac{g}{mol} } = 5.51*10^{-4}\ mol.$

Since for every mole of Tl in $TlI$ there are two moles of Tl in $Tl_2SO_4$ , we have:

$moles\ of\ Tl_2SO_4 = 2 * moles\ of\ TlI = 1,102*10^{-3}\ mol$

Using the molar mass of $Tl_2SO_4$ we have:

$mass\ of\ Tl_2SO_4 = 1,102*10^{-3}\ mol * 504.83\ \frac{g}{mol}= 0.56\ g$

Finally, we can use the mass percentage formula:

$mass\ percentage = (\frac{solute\ mass}{solution\ mass} )*100 = (\frac{mass\ of\ Tl_2SO_4}{pesticide\ sample\ mass})*100 = (\frac{0.56g}{9.486g})*100 = 5.86\%$

6 0

3 years ago

A student placed 0.0243 g of magnesium in 50 mL of 0.200 molar HCl solution, producing H2 gas according to the following reactio

V125BC [204]

Answer:

Volume of hydrogen gas = 0.1539dm3

Explanation:

Equation of the reaction

Mg(s) + 2HCl --> MgCl2(aq) + H2(g)

Molar concentration of HCl = 0.2mol/dm3

Mass of magnesium = 0.0243g

Volume of HCl = 0.05dm3

No of moles of HCl = Volume * molar concentration

= 0.05 * 0.5

= 0.01mol

No of moles of Magnesium = mass/molecular weight

Molecular weight of Magnesium = 24g/mol

No of moles of magnesium = 0.0243/24

= 0.001013mol

Using stoichiometry,

Since 1 mole of Magnesium metal reacted with 2 moles of HCl acid

HCl is the limiting reagent.

Therefore, 1 mole of hydrogen gas is given off.

0.005 mole of hydrogen is given off.

Using ideal gas law, PV = nRT

Volume = (0.005 * 0.0821 * 300)/0.8

= 0.1539dm3

8 0

4 years ago

What phrase Best defines energy ￼

What phrase Best defines energy