CHEMISTRY MIDDLE SCHOOL

Which requires more energy to move an electron? from n = 3 to n = 4
from n = 2 to n = 3
from n = 1 to n = 2

Answers

Answer 1
Answer:

Answer:

From n=1 to n=2

Explanation:

Electrons in n=1 are strongly attracted to the nucleus and therefore will require great force to overcome the electrostatic force of attraction to displace them from the energy level to another.

The electrostatic force reduces as you progress to the outer energy levels.
Answer 2
Answer:

Answer:

C. from n = 1 to n = 2

Explanation:

A.

\Delta E=E_(final)-E_(initial)

\Delta E=-1312[(1)/((n_f^2 ))-\frac {1}{(n_i^2 )}]KJ mol^(-1)

\Delta E=-1312[(1)/((4^2 ))-\frac {1}{(3^2 )}]KJ mol^(-1)

\Delta E=-1312[(1)/((16 ))-\frac {1}{(9)}]KJ mol^(-1)

\Delta E=-1312[0.0625-0.111]KJ mol^(-1)

\Delta E=64 KJ mol^(-1)

B.

\Delta E=E_(final)-E_(initial)

\Delta E=-1312[(1)/((n_f^2 ))-\frac {1}{(n_i^2 )}]KJ mol^(-1)

\Delta E=-1312[(1)/((3^2 ))-\frac {1}{(2^2 )}]KJ mol^(-1)

\Delta E=-1312[(1)/((9 ))-\frac {1}{(4)}]KJ mol^(-1)

\Delta E=-1312[0.111-0.25]KJ mol^(-1)

\Delta E=182 KJ mol^(-1)

C.

\Delta E=E_(final)-E_(initial)

\Delta E=-1312[(1)/((n_f^2 ))-\frac {1}{(n_i^2 )}]KJ mol^(-1)

\Delta E=-1312[(1)/((2^2 ))-\frac {1}{(1^2 )}]KJ mol^(-1)

\Delta E=-1312[(1)/((4))-\frac {1}{(1)}]KJ mol^(-1)

\Delta E=-1312[0.25-1]KJ mol^(-1)

\Delta E=984 KJ mol^(-1)

Related Questions

Write hypothesis about a valcano
How can you increase and decrease the viscosity of a liquid?
According to the food web. which of the following would be considered secondary consumers? PlantsGrasshoppersWolvesMushrooms​
the element silver has two naturally occurring isotopes 109Ag and 107Ag with a mass of 106.905u. silver consists of 51.82% 107Ag and has an average atomic mass of 107.868u. calculate the mass of 109 Ag
Cells get energy from food to sustain the life of the organism.Which statement supports this part of the cell theory?A. Cells are the basic units of life.B. All cells come from pre-existing cells.C. All organisms are made up of 1 or more cel

How many liters of CO2 form at STP if 5.0 g ofCaCO3 are treated with excess hydrochloric acid?

Answers

Answer: STP

CaCO3 = 5 g

Convert gram to mol

100 g of CaCO3   = 1 mol

5 g of  CaCO3 (n)  = 5 g *(1 mol/100 g) = 0.05 mol

Gas law  

PV =nRT

V = nRT/P  

V = (0.05 mol * (0.08206 L atm /K mol) *273 K)/1 atm

V = 1.124 L

Explanation:

Final answer:

When 5.0 g of CaCO3 are treated with excess hydrochloric acid, it forms 1.118 L of CO2 gas at STP.

Explanation:

When 5.0 g of CaCO3 is treated with excess hydrochloric acid, it undergoes a chemical reaction and forms CO2 gas. To find the number of liters of CO2 formed at STP (standard temperature and pressure), we need to use the ideal gas law. The molar mass of CaCO3 is 100.09 g/mol, and 1 mol of CaCO3 produces 1 mol of CO2 gas. The volume of 1 mol of any gas at STP is 22.4 L. Therefore, we can calculate the number of moles of CaCO3, then convert it to moles of CO2 and finally to the volume of CO2 gas in liters.

Using the given information, we have:
Mass of CaCO3 = 5.0 g
Molar mass of CaCO3 = 100.09 g/mol
Moles of CaCO3 = Mass of CaCO3 / Molar mass of CaCO3
Moles of CO2 = Moles of CaCO3
Volume of CO2 at STP = Moles of CO2 * 22.4 L/mol

Plugging in the values, we get:
Moles of CaCO3 = 5.0 g / 100.09 g/mol = 0.04997 mol
Moles of CO2 = 0.04997 mol
Volume of CO2 at STP = 0.04997 mol * 22.4 L/mol = 1.118 L

Learn more about Volume of CO2 gas formed here:

brainly.com/question/35356488

#SPJ2

A roller coaster track is 3,000 meters long. It takes 100 seconds totravel once around the roller coaster. What is the average speedof the roller coaster? Is the velocity constant throughout the trip?Explain. Ty for helping

Answers

The rollercoaster went 200 miles.
the spped is: 
v=d/t
or, v=3000m/100s
or, v= 30m/s

the velocity is not constant as the roller coaster keeps changing direction, it is not constant

Molecular formula of ammonia

Answers

The answer is NH3
Hope this helps!

24 POINTS!!!!!!!!!!!!!!!!!!Sarah, who has a mass of 55 kg, is riding in a car at 20 m/s. She sees a cat crossing the street and slams on the brakes! Her seatbelt stops her from flying forward, bringing her to rest in 0.5 seconds. How much force did the seatbelt put on Sarah?

Answers

F = (mass)(acceleration) = ma

m = 55 kg

Vi = 20 m/s

t = 0.5 s

Vf = 0 m/s (since she was put to rest)

a=(Vf-Vi)/t

a=(0-20)/5

a = 40 m/s^2 (decelerating)

F = ma = (55 kg)(40 m/s^2)

F = 2200 N

Hope this answer will be a good help for you.
 change of momentum =mv-mu=m(v-u)=55(0-20)=-1100
rate of change of momentum=-1100/0.5=-2200  this is equal to force applied.
so force=-2200 kg/m^2
negative sign shows force acts in opposite direction to motion.

How is Earth like a magnet

Answers

Earth's magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create magnetic fields. From afar, the Earth looks like a big magnet with a north and south pole like any other magnet.
Earth's magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create magnetic fields. From afar, the Earth looks like a big magnet with a north and south pole like any other magnet.

Convert 30.0 cm to meters

Answers

Answer:

your answer would be 0.3 meters

To get the meter you have to divide the length 30 value by 100

which will give you 0.3.

Hope this helped! Have an amazing rest of your day :)
Other Questions
Are diamonds shiny or dull?Also can you give me an example of dull?
The planet we call Earth has how many main layers
11. The density of liquid chloroform is 1.48 g/mL. What is its density in units of lb/in?(2.54 cm = 1 in., 2.205 lb = 1 kg)
Explain how density affect boiling point