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3 years ago

Describe Solubility, Viscosity, luster, malleability & ductility

Chemistry

2 answers:

r-ruslan [8.4K]3 years ago

3 0

Answer:

a gentle sheen or soft glow, especially that of a partly reflective surface.

"the luster of the Milky Way

a thin coating containing unoxidized metal which gives an iridescent glaze to ceramics.

expeople1 [14]3 years ago

3 0

Answer:

Solubility is the property of a solid, liquid or gaseous chemical substance called solute to dissolve in a solid, liquid or gaseous solvent.

Viscosity is the state of being thick, sticky, and semifluid in consistency, due to internal friction.

Luster is a gentle sheen or soft glow, especially that of a partly reflective surface.

Malleability is a physical property of metals that defines their ability to be hammered, pressed, or rolled into thin sheets without breaking. In other words, it is the property of a metal to deform under compression and take on a new shape.

and lastly Ductility is when a solid material stretches under tensile strain. If ductile, a material may be stretched into a wire. Malleability, a similar property, is a material's ability to deform under pressure (compressive stress). If malleable, a material may be flattened by hammering or rolling.

Explanation: i hope this helps!

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An excess of oxygen reacts with 451.4 g of lead, forming 374.7 g of lead(II) oxide. Calculate the percent yield of the reaction.

Stels [109]

Answer: The percent yield of the reaction is 77.0 %

Explanation:

$2Pb+O_2\rightarrow 2PbO$

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

$\text{Number of moles of lead}=\frac{451.4g}{207.2g/mol}=2.18moles$

$\text{Number of moles of lead oxide}=\frac{374.7g}{223.2g/mol}=1.68moles$

According to stoichiometry:

2 moles of $Pb$ produces = 2 moles of $PbO_2$

2.18 moles of $Pb$ is produced by= $\frac{2}{2}\times 2.18=2.18moles$ of $PbO_2$

Mass of $PbO_2$ = $moles\times {\text {Molar mass}}=2.18\times 223.2g/mol=486.6$

percent yield = $\frac{374.7g}{486.6g}\times 100=77.0\%$

3 0

3 years ago

The molecules in a sample of oxygen gas are in constant motion. What does an increase in temperature indicate about the movement

Basile [38]

Answer:

An increase in temperature indicates that the molecules of gas speed up.

Explanation:

The molecular kinetic theory states that the average kinetic energy of gas particles (molecules) is proportional to the absolute (Kelvin) temperature of the gas, and all gases at the same temperature have the same average kinetic energy.

Therefore, as the temperature increases so the kinetic energy increases.

It is also known that the kinetic energy is proportional to the squared speed of the particles, therefore the higher the kinetic energy the average speed of the molecules:

higher temperature → higher kinetic energy → higher average speed

4 0

3 years ago

Read 2 more answers

Question 28 (2 points)

Afina-wow [57]

Answer:

Il of the above are part of the Kinetic Molecular Theory

Explanation:

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3 years ago

the difference between these two measurements: 60 m and 60.00 m How many sig figs does each contain? Clearly explain which digit

tensa zangetsu [6.8K]

This problem is providing two measurements, 60 m and 60.00 m and asks for the difference in the significant digits, accuracy, uncertainty, whether they are the same or not and how they differ.

<h3>Significant figures:</h3>

In chemistry, the use of significant figures is crucial, because they define the most appropriate way to report a measurement. Thus, we can say that the more decimals a measurement has, the more accurate and the less uncertain it is. Also, if no decimal places are present, tracking zeros are not significant.

In such a way, one can conclude that 60 m has just one significant figure (0 does not count) whereas 60.00 m has four (there is a decimal making all zeros significant), 60.00 m is more accurate as more decimal places are reported. On the other hand 60 m is the more uncertain as less decimals contribute to its accuracy.

In addition, we say they can be the same measurement, as long as they represent the same idea, sixty meters, the thing is 60.00 m is more accurate yet they refer to the same measurement.

Learn more about significant figures: brainly.com/question/11904364

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3 years ago

What are examples of methodological errors in a chemistry lab?

rewona [7]

Answer:

i) Use of wrong Indicator in acid base titration.

ii) Addition of chemicals with improper sequence.

iii) Wrong technique used during chemical reaction.

7 0

4 years ago