Answer:
A, C and D
Explanation:
Lewis acid are compounds that accept a pair of non-bonding electron while Lewis base are compound that donate non-bonding electron pairs. Lewis acid in the options are NaHCO₃ because it has both acidic and basic properties ( ampholyte), (CH3CH2)2HC+ is deficient of electron and BBr3 because boron has an incomplete octet configuration and deficient of two electron
Number of atoms = moles of magnesium x 6.02x10^23
= 5x6.02x10^23
= 3.01x10^24 atoms.
Hope this helps!
Answer:
Ground state
Explanation:
Ground state is the lowest energy level of particle. In this state toms are stable.
When transition occur from lower energy level to higher energy level require a gain of energy. Electron could not jump into higher energy level without gaining thew energy.
When electron jump into lower energy level from high energy level it loses the energy.
The process is called excitation and de-excitation.
Excitation:
When the energy is provided to the atom the electrons by absorbing the energy jump to the higher energy levels. This process is called excitation. The amount of energy absorbed by the electron is exactly equal to the energy difference of orbits.
De-excitation:
When the excited electron fall back to the lower energy levels the energy is released in the form of radiations. this energy is exactly equal to the energy difference between the orbits. The characteristics bright colors are due to the these emitted radiations. These emitted radiations can be seen if they are fall in the visible region of spectrum.
Answer:
Double replacement
Precipitation reaction
Explanation:
You have the reaction:
REACTANTS PRODUCTS
BaCl₂ (aq) + Na₂SO₄ (aq) ⇒ 2NaCl (aq) + BaSO₄(s)
The general form of a double replacement reaction is the following:
AB + CD ⇒ CD + AB
The reactants basically, exchanged partners. In the case of your problem, Barium(Ba) and Sodium(Na) switched places. So this makes it a double-replacement reaction.
Now how do I know it is a precipitation reaction. A precipitation reaction occurs when two solutions combine and salt is formed. Salt is solid, so how do I know that's what occured? Look at your equation again:
BaCl₂ (aq) + Na₂SO₄ (aq) ⇒ 2NaCl (aq) + BaSO₄(s)
aq means aqueous (liquid)
s means solid
If you look at the product formed in the reaction, from two solutions, it formed a solid. So this is your clue as to why it is a precipitation reaction.
Answer:
The answer is 2.258 x 10^24 molecules are presented in 7.5 grams of H2.
Explanation:
I am going to use the chart that I attached to answer this question.
To convert grams to molecules we need to divide by the molar mass and multiply by 6.02 x 10^23, which is the value of a mole.
In this case the molar mass is 2 because the molar mass of H is 1 and we need to multiply by 2 to get the molar mass of 2 hydrogens.
Molar Mass = 1 x 2 = 2
Then, we need to divide the grams that we have by 2 to covert grams into moles. Finally, to convert moles into molecules we need to multiply the moles by 6.02 x 10^23.
7.5 grams / 2 = 3.75 moles
(3.75 moles)(6.02 x 10^23) = 2.258 x 10^24 molecules
Molecules are equal to atoms, so 2.258 x 10^24 molecules = 2.258 x 10^24 atoms
