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3 years ago

Which of the following elements is most nonmetallic - most wanting of electrons?

Chemistry

1 answer:

Ierofanga [76]3 years ago

3 0

Answer:

B. Fluorine

Explanation:

Nonmetallic character increases from bottom to top in a Group and from left to right in a period (see image).

Thus, the most nonmetallic elements are at the upper right corner of the Periodic Table.

We ignore the noble gases, because they are quite unreactive.

So, the element that most “wants” an electron is fluorine.

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If 12.5 grams of the original sample of cesium-137 remained after 90.6 years, what was the mass of the original sample?

myrzilka [38]

Answer:

Mass of original sample = 100 g

Explanation:

Half life of cesium-137 = 30.17 years

$t_{1/2}=\frac {ln\ 2}{k}$

Where, k is rate constant

So,

$k=\frac{\ln2}{t_{1/2}}$

$k=\frac{\ln2}{30.17}\ year^{-1}$

The rate constant, k = 0.02297 year⁻¹

Time = 90.6 years

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

Initial concentration $[A_0]$ = ?

Final concentration $[A_t]$ = 12.5 grams

Applying in the above equation, we get that:-

$12.5\ g=[A_0]e^{-0.02297\times 90.6}$

$[A_0]=\frac{12.5}{e^{-0.02297\times 90.6}}\ g=100\ g$

Mass of original sample = 100 g

8 0

3 years ago

Someone please help me!!

sesenic [268]

Answer:

the 3rd one (0.01 cm the one selected already)

Explanation:

copper wire isn't excessively big, and it wraps around the pencil because its malleable. I think that the most accurate would be 0.01 cm

4 0

3 years ago

A box sitting on a floor. Maria and Sam push on the box in opposite direction. Maria pushes to the right using 95 N of Force and

Gemiola [76]

It would move to the right with 15 N of force :)

5 0

3 years ago

Read 2 more answers

A wildfire can destroy thousands of acres of forest. Explain two positive effects and two negative effects that a wildfire can h

Lynna [10]

Explanation:

Wildfires destroy forests that are great carbon sinks. This means that large amount of carbon dioxide are released back into the atmosphere. Carbon dioxide is a greenhouse gas and this will contribute to global warming.

An advantage is that the wildfire will spur secondary ecological succession. This kind of succession improves the biodiversity of the forest. Biodiversity improves the productivity of the ecosystem.

Learn More:

For more on secondary ecological succession check out;

brainly.com/question/2456852

brainly.com/question/13866761

#LearnWithBrainly

5 0

3 years ago

How many grams of h2 are needed to react with 48 grams of o2, given the reaction: 2 h2 (g) + o2 (g) --> 2 h2o (l)?

photoshop1234 [79]

1.Calculate the number of mole of O2: 48/32=1.5 mol
2.Calculate the number of mole of H2 by mole ratio: 1.5 x 1/2=0.75 mol
3.Calculate the answer:
0.75 x 2=1.5g

5 0

3 years ago