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2 years ago

Which statements concerning potassium and bromine are true?

Chemistry

1 answer:

Naily [24]2 years ago

3 0

Answer:

the correct answers is c

Explanation:

The electronegativity of bromine is 2.96 and that of potassium is less than 1, and its first ionization energy is 1139.9 kj / mol, while that of potassium is approximately 400.

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Consider two concentric spheres whose radii differ by t = 1 nm, the "thickness" of the interface. At what radius (in nm) of sphe

Gala2k [10]

Answer:

Radius of the interior sphere = 3.847 nm

Explanation:

The volume of the shell (Vs) is equal to the difference of the volume of the outer sphere (Vo) and the volume of the inner sphere (Vi). Then:

$V_s=V_o-V_i=V_i\\V_o=2*V_i\\$

If we express the radius of the outer sphere (ro) in function of the radius of the inner sphere (ri), we have (e being the shell thickness):

$r_o=r_i+e$

The first equation becomes

$\frac{4 \pi}{3}*r_o^{3} = 2 * \frac{4 \pi}{3}*r_i^{3} \\\\\frac{4 \pi}{3}*(r_i+e)^{3} = 2 * \frac{4 \pi}{3}*r_i^{3} \\\\(r_i+e)^{3} = 2 *r_i^{3} \\\\(r_i^{3}+3r_i^{2}e+3r_ie^{2}+e^{3})=2r_i^{3}\\\\-r_i^{3}+3r_i^{2}e+3r_ie^{2}+e^{3}=0\\\\-r_i^{3}+3r_i^{2}+3r_i+1=0$

To find ri that satisfies this equation we have to find the roots of the polynomial.

Numerically, it could be calculated that ri=3.847 nm satisfies the equation.

So if the radius of the interior sphere is 3.847 nm, the volume of the interior sphere is equal to the volume of the shell of 1nm.

8 0

2 years ago

In which medium does sound travel the slowest?

ZanzabumX [31]

Sound actually travels slower in air.This is because sound is kinetic energy and has to pass from molecule to molecule.In gas the molecules are farther apart taking more time for it to pass,in water the molecules are closer so it takes less time for the sound to get from one molecule to another and with cast iron (since it's very dense) the molecules are very close allowing sound to travel quickly with ease.

5 0

3 years ago

Read 2 more answers

Which of the following is not equal to 0.536 kilometers? 53.6 hectometers (hm) 536 meters (m) 536,000 millimeters (mm) 53,600 ce

garri49 [273]

I believe it would be 53.6 hectometers, but I'm not 100% sure

8 0

2 years ago

Read 2 more answers

Calculate the number of moles 3.16 g of KMnO4 32.33 g of K2CrO4 100 g of KHCO3

kvasek [131]

The number of moles:
3.16g of $KMnO_{4}$
1 mole of $KMnO_{4}$ - 158g.
x moles of $KMnO_{4}$ - 3.16g.
$x=\frac{1\ mole*3.16g}{158g}=\frac{3.16}{158}=0.02\ mole$

The number of moles:
32.33g of $K_{2}CrO_{4}$
1 mole of $K_{2}CrO_{4}$ - 194g.
x moles of $K_{2}CrO_{4}$ - 32.33g.
$x=\frac{1\ mole*32.33g}{194g}=\frac{32.33}{194}=0.17\ mole$

The number of moles:
100g of $KHCO_{3}$
1 mole of $KHCO_{3}$ - 100.1g.
x moles of $KHCO_{3}$ - 100g.
$x=\frac{1\ mole*100g}{100.1g}=\frac{100}{100.1}=0.999\ mole$

Greetings,
n00nst00p :)

3 0

2 years ago

Compare the state of plasma to the other states of matter

dmitriy555 [2]

Plasma is the most least form on Earth and we hardly use it but it is the most common in the universe because it is mostly loacted in space

4 0

3 years ago