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Basile [38]
3 years ago
7

List at least two chemical reactions that resulted in a white precipitate. For these reactions list the possible chemical name o

f the precipitate. What do these reactions (and the others with white precipitates) have in common?
Chemistry
1 answer:
Alina [70]3 years ago
8 0
Barium chloride + sodium sulphate --> barium sulphate + sodium chloride
BaCl2 + Na2SO4 ---> BaSO4 + 2 NaCl
The barium sulphate appears as a white precipitate

Silver nitrate +  Sodium chloride ---> Silver Chloride + sodium nitrate
AgNO3 + NaCl ----> AgCl + NaNO3
The silver chloride appears as a white precipitate.

These  are sometimes called double decomposition reactions.
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What is the wavelength of an electromagnetic wave that has a frequency of
STALIN [3.7K]

The wavelength of an electromagnetic wave that has a frequency of 1.82 x 10¹⁸ Hz in a vacuum is 1.65 × 10^{-10}m.

<h3>How to calculate wavelength?</h3>

The wavelength of a wave can be calculated by dividing the speed of the wave by its frequency.

According to this question, a wave has a frequency of 1.82 x 10¹⁸ Hz in a vacuum and speed of light in a vacuum is 3.00 × 10⁸ m/s.

λ = \frac{v}{f}

Wavelength (λ) = 3 × 10⁸ ÷ 1.82 × 10¹⁸

Wavelength (λ) = 1.65 × 10^{-10} m

Therefore, the wavelength of an electromagnetic wave that has a frequency of 1.82 x 10¹⁸ Hz in a vacuum is 1.65 × 10^{-10}m.

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7 0
3 years ago
How many protons, neutrons and electrons are in the neutral atom ? *
Talja [164]

Answer:

=5 protons, 6 neutrons,5 electrons

All atoms of boron always contain 5 protons, as that defines its atomic number 5, Boron atomic number 5 has five electrons in its ground state.

Commonly Boron will lose 3 electrons leaving 2 electrons in its most common ionic form,all atoms of boron always contain 5 protons, as that defines its atomic number 5

The mass number for boron-11 is 11 (it's given to you), and recall that the number of protons plus the number of neutrons equals the mass number.

A 11B atom thus contains 11(mass number)−5(protons)=6 neutrons

The atomic number gives the number of protons,protons which have a positive charge are balanced by an equal number of electrons in a neutral atom.

Boron number 5 has five protons and therefore as a neutral atom also has five electrons.

Boron has an electron configuration of 1s22s22p1

The most stable electron configuration for Boron is 1s2 + 3 charge,by losing three electrons Boron can achieve the stable electron structure of Helium

Explanation:

4 0
3 years ago
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