Use the problem below to answer the question:

What is the maximum number of electrons that can be contained in the first, second, third, and fourth energy levels, respectivel

Marysya12 [62]

Answer:First energy level = 2electrons

Second energy level = 8 electrons

Third energy level = 18 electrons

Fourth energy level = 32 electrons

Explanation: Each energy level can contain up to $2n^2$ electrons. Where n indicates number of level

For first energy level where n=1

Number of electrons = $2(1)^2 = 2$

For second energy level where n =2 Number of electrons = $2(2)^2 =8$

For Third energy level where n=3

Number of electrons=

$2(3)^2 = 18$

For fourth energy level where n=4

Number of electrons =

$2(4)^2 = 32$

5 0

4 years ago

On a cool, rainy day, the barometric pressure is 746 mmHg. Calculate the barometric pressure in centimeters of water (cmH2O) (d

docker41 [41]

Answer:

100.71 cm H2O

Explanation:

In a fluid column barometer, the height of the fluid column is proportional to the pressure. The pressure is by definition:

$P=\frac{F}{A}$ , where F is a force and A is the area.

In a column barometer the force is given by the weight of the fluid:

$F=m*g$ , and the mass may be expressed as $m=p*V$ , where $p$ is the density and V is the volume.

Replacing this in the pressure definition:

$P=\frac{pVg}{A}$

In a constant cross section area column, the volume may be calculated as:

$V=A*h$ where A is the area and h the height. Replacing this in the previous equation:

$P=\frac{pAhg}{A}=pgh$

Different columns may be over the same pressure, so:

$P_{w}=P_{Hg}\\ p_{w}h_{w}g=p_{Hg}h_{Hg}g\\$

Dividing each part for gravity constant:

$p_{w}h_{w}=p_{Hg}h_{Hg}$

And isolating hw:

$h_{w}=\frac{p_{Hg}h_{Hg}}{p_{w} } \\h_{w}=\frac{13.5*746}{1.00}=10071$ mm

It is equal to 1007,1 cm.

7 0

3 years ago

Module 2 dba for chemistry questions? flvs

NeX [460]

Can you translate to english?

4 0

4 years ago

Which of the following aqueous solutions should demonstrate the most non-ideal behavior? A. 0.1 M NaI B. 0.2 M CuSO4 C. 0.5 M KB

Maslowich

Answer:

D. 2.0 M CuCl2

Explanation:

The ionic strength of a solution shows the concentration of its ions in that given solution of the compound. Dissolved ionic compounds always dissociate into ions. The total amount of ions in solution will definitely affect the properties of the solution. The concept of ionic strength was first introduced by Lewis and Randall in 1921 while describing the activity coefficients of strong electrolytes.

The ionic strength of CuCl2 is 6M as shown:

ionic strength = 0.5*[(+2)^2*2M + (1-)^2*4M] = 6 M

The higher the ionic strength of a solution, the greater its non ideal behavior.

CuCl2 shows the greatest ionic strength hence the greatest non ideal behavior.

6 0

3 years ago

Which of the reactions are exothermic?

Nutka1998 [239]

Answer:

Reaction A, B, E and F are exothermic reactions.

Explanation:

Exothermic reactions are defined as the reactions in which energy of reactants is more than the energy of the products. In these reactions, energy is released by the system.

The total enthalpy of the reaction $(\Delta H)$ comes out to be negative.

Endothermic reactions are defined as the reactions in which energy of products is more than the energy of the reactants. In these reactions, energy is absorbed by the system.

The total enthalpy of the reaction $(\Delta H)$ comes out to be positive.

So, from the given option reaction which are exothermic are with negative value $(\Delta H)$ that enthalpy of reaction and those are:

1) $2Mg(s) + O_2( g )\rightarrow 2MgO (s)$ ,ΔH = -1203 kJ/mol

2) $NH_3 (g) + HCl (g)\rightarrow NH_4Cl (s)$ ,ΔH =-176 kJ/mol

3) $C(graphite) + O_2 (g)\rightarrow CO_2 (g)$ ,ΔH = -393.5 kJ/mol

4) $CH_4 (g) + 2O2 (g)\rightarrow CO_2 (g) + 2H_2O (l)$ ,ΔH =-891 kJ/mol

6 0

4 years ago