Answer:
Lithium oxide, Li₂O.
Explanation:
Hello!
In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:
Which means that the metallic oxide has the following formula: M₂O. Next, we can set up the following proportional factors according to the chemical reaction:
Thus, we perform the operations in order to obtain:
So we solve for x as shown below:
Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.
Best regards!
Answer:
O
2 has a mass of 1.78g
Explanation:
We are at STP and that means we have to use the ideal gas law equation!
P represents pressure (could have units of atm, depending on the units of the universal gas constant)
V represents volume (must have units of liters)
n represents the number of moles
R is the universal gas constant (has units of
L
×
a
t
m
m
o
l
×
K
)
T represents the temperature, which must be in Kelvins.
Next, list your known and unknown variables. Our only unknown is the number of moles of
O
2
(
g
)
. Our known variables are P,V,R, and T.
At STP, the temperature is 273K and the pressure is 1 atm. The proportionality constant, R, is equal to 0.0821
L
×
a
t
m
m
o
l
×
K
Now we have to rearrange the equation to solve for n
n
=
P
V
R
T
n
=
1
atm
×
1.25
L
0.0821
Lxxatm
m
o
l
×
K
×
273
K
n
=
0.05577
m
o
l
To get the mass of
O
2
, we just have to use the molar mass of oxygen as a conversion factor:
0.0577
mol
O
2
×
32.00
g
1
mol
= 1.78g
O
2
Blank #1: Polyatomic
Blank #2: 2 (see explanation)
Blank #3: 1 (see explanation)
<h3>Explanation</h3>
Both the ammonium ion 
and the sulfate ion 
contain more than one atom in each ion. The two species are thus <em>polyatomic</em>. The chloride ion 
, for example, is <em>monoatomic</em>.
Superscripts above formulae of the ions indicate their charge. Each ammonium ion carries a positive one (+1) charge. Each sulfate ion carries a charge of negative two (-2).
Ammonium sulfate is an ionic compound. A sample of this compound contain myriads of ammonium ions and sulfate ions. The ions are packed in three-dimensional lattices. Thus unlike water, ammonium sulfate does not exist as molecules in nature.
Assuming that the second and third blanks refers to a formula unit, rather than a molecule, of ammonium sulfate. The empirical formula of ammonium sulfate gives the minimum whole-number ratio between the two ions in a sample.
Charges shall balance between the two ions. Ammonium ions are of charge +1. Sulfate ions are of charge -2. The sample shall thus contain two ammonium ions for every one sulfate ion.
The empirical formula of ammonium sulfate is therefore 
.
There are thus two ammonium ions and one sulfate ion in each formula unit of ammonium sulfate.
Answer:
The height of the waves vary. The wave height is much larger for the air boat than for the mosquito.
Explanation:
Plato question
Answer:
The transition from lower energy level to higher energy level require a gain of energy.
Explanation:
When transition occur from lower energy level to higher energy level require a gain of energy. Electron could not jump unto higher energy level without gaining thew energy.
When electron jump into lower energy level from high energy level it loses the energy.
For example electron when jumped from 2nd to 3rd shell it gain energy and when in return back to 2nd shell from 3rd shell it loses 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.
