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wolverine [178]
2 years ago
11

Any help? :) please

Chemistry
1 answer:
NikAS [45]2 years ago
6 0
1.Kinetic
2.Kinetic
3.Nuclear
4.Energy
5.Potential
6.Eletrical
7.Potential
8.Work
9.Mechanical
10.Thermal
11.Work
12.Radiant

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Calculate the energy and frequency of red light having a wavelength of 6.55 x 10⁻7m.
stiv31 [10]

Answer:

E = 3.035× 10-¹⁹J = 1.9eV

f = 4.58 × 10¹⁴Hz

Explanation:

wavelength = 6.55 × 10-⁷m

c = 3 × 10⁸m/s

f = ?

E = ?

a) f = c/wavelength

f = 3 × 10⁸/6.55 × 10-⁷

f = 4.58 × 10¹⁴Hz

b) E = hc/wavelength

E = 6.626×10-³⁴ × 3 × 10⁸/ 6.55 × 10-⁷

E = 3.035 × 10-¹⁹J

1ev = 1.6 × 10-¹⁹J

Therefore E = 3.035/1.6 = 1.9eV

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Answer:

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Mendeleev's periodic table

Dmitri Mendeleev

Like many scientists working at the end of the 19th-century the Russian chemist Dmitri Mendeleev (1834-1907) was looking for ways to organise the known elements. Mendeleev published his first periodic table of the elements in 1869.

Features of Mendeleev's tables

Mendeleev arranged the elements in order of increasing relative atomic mass. When he did this he noted that the chemical properties of the elements and their compounds showed a periodic trend. He then arranged the elements by putting those with similar properties below each other into groups. To make his classification work Mendeleev made a few changes to his order:

he left gaps for yet to be discovered elements
he switched the order of a few elements to keep the groups consistent
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If a plane travels at a speed of 600 km/h, how long<br> would it take to travel a distance of 300 km
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divide the length and time and it would be half of that, so 300 km would take 30 mins.

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