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3 years ago

What is the heaviest noble gas? A.Helium B.Radon C.Fluorine D.Astatine

Chemistry

1 answer:

Ira Lisetskai [31]3 years ago

5 0

Answer:

Radon is the heaviest Noble Gas

Explanation:

This statement is very easy to be solved. As we know that Noble Gases are group of Elements which have complete valence shell and are stable elements and don't react easily and hence, are found in mono-atomic form in nature. These elements can be found on the extreme right of the periodic table in group 8 or group 18. Following are the Noble elements,

(i) Helium

(ii) Neon

(iii) Argon

(iv) Xenon

(v) Radon

Now,

In statement we are provided with only two noble gases i.e. Helium and Radon. Therefore, it is easy among them to finalize the heaviest one as Radon having atomic mass of 222.02 g/mol and atomic radii of 0.22 nm is much denser/heavier than Helium having atomic mass of 4.0 g/mol and atomic radii of 0.122 nm.

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Why is the sky orange and red at sunrise and sunset?

Allushta [10]

Answer:

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Explanation:

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3 years ago

A 5.00-mL sample of blood was treated with trichloroacetic acid to precipitate proteins. After centrifugation, the resulting sol

Anarel [89]

Explanation:

According to the Beer-lambert' s law,

Absrobance = absrobptitvity × lenght × concentration

So, if we will plot a graph between absrobance and concentration then we will obtain a straight line

Hence, formula to calculate slope of the graph is as follows.

The slope of graph = $\frac{\text{difference in absrobance at two points}}{\text{difference in concentrations at those points}}$

The given data is as follows.

$A_{1}$ = 0.412 (first point)

$A_{2}$ = 0.642 (second point)

$C_{1}$ = 0.240 ppm (first point)

$C_{2}$ = 0.475 ppm (second point)

Hence, putting these values into the above formula we will calculate the value of slope as follows.

Slope = $\frac{\text{difference in absrobance at two points}}{\text{difference in concentrations at those points}}$

= $\frac{0.642 - 0.412}{0.475 - 0.240}$

= $\frac{0.23}{0.235}$

= 0.978

It is known that for the graph, line equation can be written as follows.

y = mx + c ........... (1)

where, C = intercept

m = slope

Hence, calculate the value of intercept as follows.

0.412 = $0.24 \times 0.978$ + c

c = 0.178

As it is given that the absorbance values 0.454 (the y-axis value). Therefore, putting this value into equation (1) we get the following.

y = mx + c

0.454 = $x \times 0.978$ + 0.178

0.276 = 0.978x

x = 0.282 ppm

Thus, we can conclude that the concentration of Pb in the given sample is 0.282 ppm.

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3 years ago

Suppose the data formed a line with a steeper slope. For the same change in temperature, how would the change in volume compare?

bogdanovich [222]

Substances can change state, usually when they are heated or cooled. For example, liquid water turns into steam when it is heated enough, and it turns into ice when it is cooled enough. ... The closeness, arrangement and motion of the particles in a substance change when it changes state.

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2 years ago

A 42.0g sample of compound containing only C and H was analyzed. The results showed that the sample contained 36.0g of C and 6.0

user100 [1]

Answer:

What is the empirical formula of the compound?

Explanation:

When the relative masses of elements in a hydrocarbon are given, it is possible to use this information to obtain the empirical formula by dividing the given masses of each element by the relative atomic masses of the element. The lowest ratio is now used to divide through to obtain the empirical formula of the compound.

The empirical formula only shows that ratio of atoms of each element present in the compound. From the information provided, the empirical formula of the compound is CH2. Hence the answer.

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3 years ago

Can someone help me write chemical equations of what went wrong in the Chernobyl nucleur accident? Eg. graphite in the rods spee

zimovet [89]

Answer:

It might be e=FCA

Explanation:

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3 years ago