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3 years ago

When an electron in an atom spontaneously jumps from a higher energy state to a lower energy state, the atom?

1 answer:

6 0

If an atom suffers from a collision, that causes an electron to jump from a lower to higher state, it is called collisional excitation

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Why is sodium metal (very soft and can cut easily) stored under oil?

ioda

Sodium is a very reactive metal. It is kept in kerosene to prevent it from coming in contact with oxygen and moisture. If this happens, it will react with the moisture present in air and form sodium hydroxide.

7 0

3 years ago

A certain second-order reaction (B→products) has a rate constant of 1.30×10−3 M−1⋅s−1 at 27 ∘C and an initial half-life of 224 s

soldier1979 [14.2K]

Answer:

$\large\boxed{\large\boxed{0.291M}}$

Explanation:

By definition one half-life is the time to reduce the initial concentration to half.

For a second order reaction the rate law equations are:

$\dfrac{d[B]}{dt}=-k[B]^2$

$\dfrac{1}{[B]}=\dfrac{1}{[B]_0}+kt$

The half-life equation is:

$t_{1/2}=\dfrac{1}{k[A]_0}$

Thus, substitute the rate constant $1.30\times 10^{-3}M^{-1}\cdot s^{-1}$ and the half-life time 224s to find [A]₀:

$224s=\dfrac{1}{1.30\times10^{-3}M^{-1}\cdot s^{-1}[A]_0}$

$[A]_o=0.291M$

7 0

4 years ago

Someone please help

sattari [20]

Answer:

A - 8

B - 8

C - O

D - 26

E - 30

F - Fe

Explanation:

Use these things:

1. A = Z + N,

where A - mass number,

Z - atomic number,

N - number of neutrons

2. atomic number = number of protons

3 0

4 years ago

Complete the sentences to explain why the lattice energy of potassium bromide is more exothermic than the lattice energy of rubi

Natali5045456 [20]

The lattice energy is the amount of energy released when the ions that make up a crystal lattice are brought together. Now, this energy is dependent on the charge concentration of these ions. Both potassium and rubidium form ions with a +1 charge, while bromine and iodine form ions with -1 charge. However, because potassium and bromine are smaller than rubidium and iodine respectively, the charge is more concentrated. Therefore, more energy is released when potassium and bromine are brought together.

5 0

3 years ago

Read 2 more answers

How many different consitutional isomers are there for a compound having the molecular formula C3H6O

Dmitry_Shevchenko [17]

Answer:

that make 11 isomers....

7 0

2 years ago