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3 years ago

[H+] for a solution is

Chemistry

1 answer:

ra1l [238]3 years ago

4 0

Answer:

Basic

Explanation:

pH = -log[H⁺] = - log(1.87 x 10⁻¹¹) = 10.73 (basic solution)

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How many unit cells share an atom that is located at the center of a cube edge of a unit cell?

andre [41]

Answer:

zero

Explanation:

In a unit cell, an atom that is located at the center of a cube edge is not involved in sharing unit cells because a central atom of a unit cell belongs to the entire cell and only to that unit cell of the lattice.

Hence, the center atom of a unit cell do not share any unit cell and the correct answer is "Zero".

6 0

3 years ago

A line in the hydrogen spectrum occurs at 434 nm. what is the frequency of this radiation in sec -1

Taya2010 [7]

The lines occurring in an emission spectrum are all electromagnetic waves, which means that their speed in a vacuum is
3 x 10⁸ m/s

We can use the equation,
v = fλ
which relates the velocity of a wave to the frequency and wavelength. Substituting values,

3 x 10⁸ = f * 434 x 10⁻⁹
f = 6.91 x 10¹⁴ Hz

The frequency of the wave will be 6.91 x 10¹⁴ oscillations per second.

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3 years ago

How many protons and neutrons are in 119_Sn? O a. 50 n and 119 p O b. 50 p and 169 1 O c. 50 p and 69 O d. 50 n and 169 p O e. N

Anastaziya [24]

Answer: The given isotope of tin has 50 protons and 69 neutrons.

Explanation:

Atomic number is defined as the number of protons or number of electrons that are present in neutral atom. It is represented as Z.

Atomic number = Number of protons = Number of electrons

Mass number is defined as the sum of number of protons and number of neutrons. It is represented as A.

Mass number = Number of protons + Number of neutrons

We are given:

An isotope having representation $_{50}^{119}\textrm{Sn}$

Mass number of Sn = 19

Atomic number = 50

Number of neutrons = Mass number - Atomic number = 119 - 50 = 69

Hence, the given isotope of tin has 50 protons and 69 neutrons.

3 0

3 years ago

Give an example of two elements that would form a covalent bond

Tamiku [17]

Hydrogen carbon and oxygen commonly form covalent bonds.

HOPE THIS HELPS!

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3 years ago

IM ON A TIME LIMIT ANSWER FAST ILL GIVE 20 POINTS AND A BRAINEST ANSWERHow will a short-term environmental change most likely af

gtnhenbr [62]

Answer:

first and 4th

Explanation:

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3 years ago