Answer:
So... for the element of SODIUM, you already know that the atomic number tells you the number of electrons. That means there are 11 electrons in a sodium atom. Looking at the picture, you can see there are two electrons in shell one, eight in shell two, and only one in shell three.
Explanation:
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<span>1. A gas occupies 4.31 litres at a pressure of 0.755atm. Determine the volume if the pressure is increased to 1.25 atm.
method: </span>Boyles Law<span>: P1/V1 = P2/V2
</span>P1/V1 = P2/V2 implies V2= P2 V1/ P1
V2=1.25x4.31 / 17=7.13L
<span>
2. 600 mL of a gas is at a pressure of 8.00atm. What is the Volume of the gas at 2 atm?
</span>method: Boyles Law: P1/V1 = P2/V2
P1/V1 = P2/V2 implies V2= P2 V1/ P1,
V1=2.6mL=0.026L
V2= P2 V1/ P1= 0.00065 L
<span>3. How hot will a 2.3 L balloon have to get to expand to a volume of 400 L? Assume that the initial temperature of the balloon is 25 degrees Celsius.
</span><span>Method: Charles Law: V1/T1 =V2/T2 Degrees Celcius + 273 = Kelvin
</span>
25 degrees Celsius=25+273=298K=T1
V1=2.3L, V2=400L
V1/T1 =V2/T2 implies T2=V2T1/V1=(400x298) /2.3=51826 K
<span>4. A gas takes up a volume of 17 litres, has a pressure of 2.3atm, and a temperature of 299K. If I raise the temperature to 350K and lower the pressure to 1.5atm, what is the new volume of the gas?
</span>
<span>Combined gas Law: (P1)(V1) = (P2)(V2)
(T1) (T2)</span>
V1=17L
P1=2.3 atm
T1= 299K
P2=1.5 atm
T2=350 K
V2=?
(P1)(V1) / T1= (P2)(V2)/ T2
so V2= (P1)(V1) T2 / P2 T1
V2=17x2.3x350 /1.5 x 299= 30.51L
The balanced half reactions are
4 Fe2+ ====> 4 Fe3+ + 4 e-
<span>MnO42- + 8 H+ + 4 e- ===> Mn2+ + 4 H2O
The net ionic equation is
4 Fe2+ + </span>MnO42- + 8 H+ ===> 4 Fe3+ + Mn2+ + 4 H2O<span />
The charge of a nucleus is neutral, meaning it’s zero
the positive charges of an atom equal the negative charges so the atom has a neutral charge
Answer : The correct symbol and charge for each of the ions must be 
and 
.
Explanation :
- Covalent compound : It is defined as the compound which is formed by the sharing of electrons between the atoms forming a compound.
The covalent compound are usually formed when two non-metals react.
- Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.
Ionic compound are usually formed when a metal reacts with a non-metal.
As we know that the sodium chloride is an ionic compound in which sodium is an alkali metal and has one valence electron and chlorine is a non-metal and has 7 valence electrons.
When sodium atom donates an electron to a chlorine atom then it forms an ionic compound that is sodium chloride (NaCl) and the resulting positive ion and negative ion form a stable ionic compound.
Hence, the correct symbol and charge for each of the ions must be and .
