3 years ago

In this part of the periodic table, what type of elements are in the group that includes elements cu, ag, and au?

Chemistry

1 answer:

tresset_1 [31]3 years ago

3 0

Transition metals are from group 3 to group 12.

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Ice has a lower density than the density of water.

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Assuming that all the energy given off in the reaction goes to heating up only the air in the house, determine the mass of metha

nirvana33 [79]

Answer:

0.92 kg

Explanation:

The volume occupied by the air is:

$35.0m\times 35.0m \times 3.2m \times \frac{10^{3}L }{1m^{3} } =3.9 \times 10^{6} L$

The moles of air are:

$3.9 \times 10^{6} L \times \frac{1.00mol}{22.4L} =1.7 \times 10^{5}mol$

The heat required to heat the air by 10.0 °C (or 10.0 K) is:

$1.7 \times 10^{5}mol \times \frac{30J}{K.mol} \times 10.0 K = 5.1 \times 10^{7}J$

Methane's heat of combustion is 55.5 MJ/kg. The mass of methane required to heat the air is:

$5.1 \times 10^{7}J \times \frac{1kgCH_{4}}{55.5 \times 10^{6} J } =0.92kgCH_{4}$

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3 years ago

How would you prepare 3.5 L of a 0.9M solution of KCl?

PolarNik [594]

$V=3,5L\\
Cm=0,9M\\
M_{KCl}=74\frac{g}{mol}\\\\
C_{m}=\frac{n}{V}\\\\
n=\frac{m}{M}\\\\
C_{m}=\frac{m}{MV} \ \ \ \Rightarrow \ \ \ m=C_{m}MV\\\\
m=0,9\grac{mol}{L}*74\frac{g}{mol}*3,5L=233,1g$

B. Add 233 g of KCl to a 3.5 L container; then add enough water to dissolve the KCl and fill the container to the 3.5 L mark.

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3 years ago

What property is primarily responsible for determining the type of electromagnetic energy and peak wavelength emitted by a star

svetoff [14.1K]

The answer i think it is... is Temperature
Hope this helped!

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A homogeneous mixture is made by dissolving some salt in a beaker of water. The mixture is referred to as a

CaHeK987 [17]

In that case, the salt would be the solvent and the water the solute.
So, it would be solution!

Have a nice day! :D

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3 years ago

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