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3 years ago

If an object has a velocity of 8 m/s and

Chemistry

1 answer:

Y_Kistochka [10]3 years ago

5 0

Answer:

Explanation:

The Kinetic Energy (K.E) of an object can be calculated as:

We are given:

K.E = 480 K

Velocity of the object = v = 8 m/s

Using the values, we get:

Thus, the mass of the object will be 15 kg.

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Fill in the coefficients that was will balance the following reaction SnSO4 + KBr SnBr2 K2SO4

Juliette [100K]

The coefficients are 1 : 2 : 1 : 1

<u>Explanation:</u>

To be a balanced equation, the chemical equation should have has equal number of atoms on both reactant and product side.

Given chemical equation:

$a_{0} {SnSO}_{4}+a_{1} K B r \rightarrow a_{2} {SnBr}_{2}+a_{3} K_{2} S O_{4}$

Now, calculate the number of atoms present in reactant side:

Sn - 1

$S O_{4}$ - 1

K - 1

Br - 1

Then, calculate the number of atoms present in product side:

Sn - 1

$S O_{4}$ - 1

K - 2

Br - 2

Therefore, in order to balance this given chemical equation multiply KBr by 2 on reactant side. So, the balanced chemical equation is as follows.

$\Sn S O_{4}+2 K B r \rightarrow S n B r_{2}+K_{2} S O_{4}$

Hence,

$a_{0} - 1\\a_{1} - 2\\a_{2} - 1\\a_{3} - 1$

8 0

3 years ago

Need help on this please help

lana66690 [7]

Answer:

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3 years ago

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How does the mass number of an element differ from its average atomic mass?

Aleonysh [2.5K]

The mass number is the total number of protons and neutrons in a nucleus of an element. The average atomic mass is the sum of the masses of an element's isotopes, each multiplied by their abundance.

4 0

4 years ago

Had beryllium and calcium already been discovered

Lina20 [59]

Answer:

Yes

Beryllium is a chemical element with the symbol Be and atomic number 4. It is a steel-gray, strong, lightweight and brittle alkaline earth metal. ... Notable gemstones high in beryllium include beryl (aquamarine, emerald) and chrysoberyl.

Calcium is a mineral that is necessary for life. In addition to building bones and keeping them healthy, calcium enables our blood to clot, our muscles to contract, and our heart to beat. About 99% of the calcium in our bodies is in our bones and teeth.

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3 years ago

Light of frequency 1.40*10^15 Hz strikes a surface, causing photoelectrons to leave with a KE of 1.05 eV. What is the work funct

katrin [286]

Work function gives the work required for an electron to be emitted from a surface. The work function emitted with photoelectrons of kinetic energy 1.05 eV is 4.74eV.

<h3>What is the photoelectric effect?</h3>

The photoelectric effect is the emission of an electron by the projected beam of light with energy greater than the work function.

The photoelectric effect is given as,

E = φ + KE

Given,

Kinetic energy of photoelectrons = 1.682 10⁻¹⁹ J (as, 1eV = 1.602 x 10⁻¹⁹ J)

Frequency = 1.40x10¹⁵ s⁻¹

Work function (φ) =?

The work function with respect to frequency is given as,

(6.623 x 10⁻³⁴Js)(1.40x10¹⁵ s⁻¹) = φ + 1.682 x 10⁻¹⁹ J

φ = (9.272 x 10⁻¹⁹) - (1.682 x 10⁻¹⁹)

φ = 7.590 x 10⁻¹⁹ J

Work function in eV is converted as, 1eV = 1.602 x 10⁻¹⁹ J

= 4.74 eV

Therefore, the work function is 4.74eV.

Learn more about work function here:

brainly.com/question/3734730

#SPJ1

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2 years ago