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3 years ago

Answer will get Brainlest!

Chemistry

2 answers:

sleet_krkn [62]3 years ago

7 0

Answer:

The answer is A

Explanation:

It doesn't have any vitamins in it, and all the elements in this answer choice are natural.

Mashutka [201]3 years ago

6 0

Answer:

Explanation:

Is it A?

I am rly not that sure

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A: -3.45 B: 17.45 C: 10.55 D: 3.55

Minchanka [31]

Answer:

i think its b

Explanation:

6 0

4 years ago

Use de Broglie's hypothesis to determine the speed of the electron in a hydrogen atom when in the n = 5 orbit, whose radius is 1

andriy [413]

Answer:

Velocity = 4.41×10⁵ m/s

Explanation:

The force of attraction between the nucleus and the electron is equal to the centrifugal force acting on the outermost electron due to circular rotation. It can be mathematically written as:

$\frac {K\times q^2}{r^2}=\frac {m\times v^2}{r}$

Where,

K is the Coulomb's constant having value 9×10⁹ N. m²/C²

q is the charge on the electron or the proton which is 1.6×10⁻¹⁹ C

r is the radius of the atom

m is the mass of the electron having value 9.1×10⁻³¹ Kg

v is the velocity of the electron.

The equation can be written to calculate the velocity as:

$v=\sqrt {\frac {K\times q^2}{m\times r}}$

Given that:

r = 1.3×10⁻⁹ m

So,

$v=\sqrt {\frac {9\times 10^9\times (1.6\times 10^{-19})^2}{9.1\times 10^{-31}\times 1.3\times 10^{-9}}}$

Velocity = 4.41×10⁵ m/s

4 0

3 years ago

Which correctly lists the following in order of increasing entropy? i. 1 mol of HCl (g) at 50 ° C ii. 1 mol of NaCl (s) at 25 °

MaRussiya [10]

Answer:

ii. < iv. < i. < iii.

Explanation:

Hello,

At first, the entropy is lower in solid-phase systems since their particles are molecularly closer. Next, by knowing that the higher the temperature, the higher the entropy, the gaseous HCl at 25 ºC occupies the second place. After that, it is clear 2 moles of HCl have more entropy than just 1 since the larger the amount of mater the higher the entropy.

Best regards.

7 0

3 years ago

This nonmetal is in the same group as lead. What is the element

Andreyy89

Lead (/lɛd/) is a chemical element in the carbon group with symbol Pb (from Latin: plumbum) and atomic number 82.

~ I don't know if this will help, but I hope it does. ~

5 0

4 years ago

how many molecule of carbon dioxide are needed to react with excess iron oxide to produce 11.6 g of iron

lesya692 [45]

Answer:

0.16 moles of Carbon

Explanation:

The balanced reaction equation:

$2Fe_{2}O_{3}$ + $3C$ → $4Fe$ + $3CO_{2}$ ↑