Which is not the name of a family on the periodic tablea) Halogens
b) Noble Gases
c) Alkali Earth Metals
d) Actinides

Answers

Answer 1

Answer:

Answer:

I think it's D

Explanation:

Answer 2

Answer: Actinides is the correct answer
your noble gases are in the 8th column
Your Halogens are your 7th column
and you alkali earth metals are the 2nd column

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A chemist titrates 160.0mL of a 0.3403M aniline C6H5NH2 solution with 0.0501M HNO3 solution at 25°C . Calculate the pH at equivalence. The pKb of aniline is 4.87 . Round your answer to 2 decimal places. Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of HNO3 solution added.

Answers

Answer : The pH of the solution is, 5.24

Explanation :

First we have to calculate the volume of $HNO_3$

Formula used :

$M_1V_1=M_2V_2$

where,

$M_1\text{ and }V_1$ are the initial molarity and volume of $C_6H_5NH_2$ .

$M_2\text{ and }V_2$ are the final molarity and volume of $HNO_3$ .

We are given:

$M_1=0.3403M\nV_1=160.0mL\nM_2=0.0501M\nV_2=?$

Putting values in above equation, we get:

$0.3403M* 160.0mL=0.0501M* V_2\n\nV_2=1086.79mL$

Now we have to calculate the total volume of solution.

Total volume of solution = Volume of $C_6H_5NH_2$ + Volume of $HNO_3$

Total volume of solution = 160.0 mL + 1086.79 mL

Total volume of solution = 1246.79 mL

Now we have to calculate the Concentration of salt.

$\text{Concentration of salt}=(0.3403M)/(1246.79mL)* 160.0mL=0.0437M$

Now we have to calculate the pH of the solution.

At equivalence point,

$pOH=(1)/(2)[pK_w+pK_b+\log C]$

$pOH=(1)/(2)[14+4.87+\log (0.0437)]$

$pOH=8.76$

$pH+pOH=14\n\npH=14-pOH\n\npH=14-8.76\n\npH=5.24$

Thus, the pH of the solution is, 5.24

The specific heat capacity of liquid water is 4.18 J/g-K. How many joules of heat are needed to raise the temperature of 5.00 g of water from 25.1°C to 65.3°C?

Answers

Answer:

840.18

Explanation:

Use the equation: Q = mcΔT

m = mass (5 g)

c = specific heat (4.18)

ΔT = change in temperature (65.3-25.1 = 40.2)

$5*4.18*40.2$ = 840.12

Write the balanced equation for the equilibrium reaction for the dissociation ofsilver chloride in water, and write the K expression for this reaction. Then create an ICE chart. Since we know the equilibrium concentration of the silver ion, we can solve for Ksp.Does it agree with the literature value

Answers

Answer:

See explanation

Explanation:

Hello there!

In this case, since the the concentrations are not given, and not even the Ksp, we can solve this problem by setting up the chemical equation, the equilibrium constant expression and the ICE table only:

$AgCl(s)\rightleftharpoons Ag^+(aq)+Cl^-(aq)$

Next, the equilibrium expression according to the produced aqueous species as the solid silver chloride is not involved in there:

$Ksp=[Ag^+][Cl^-]$

And therefore, the ICE table, in which x stands for the molar solubility of the silver chloride:

$\ \ \ \ \ \ \ \ \ \ \ \ \ \ AgCl(s)\rightleftharpoons Ag^+(aq)+Cl^-(aq)$

I - 0 0

C - +x +x

E - x x

Which leads to the following modified equilibrium expression:

$Ksp=x^2$

Unfortunately, values were not given, and they cannot be arbitrarily assigned or assumed.

Regards!

Juan noticed that a door that sticks on hot days does not stick when it cools off at night. This is because the metal contracts as it cools. The reason for this is that, as the metal cools, the atoms:become smaller and take up less space .

slow down and move closer together.

merge together to form fewer atoms.

speed up and move further apart.

Answers

The atoms in the metal slow down and move closer together. So the answer is B.

The resolution calculated for the tlc separation of a two-component mixture is determined to be equal to 2.0. does the represent good separation or not? explain

Answers

Answer: No, it does not represent a good separation.

Explanation: Resolution is the measure of extent of separation between two components and the base-line separation. It is calculated using the formula

$R_s=2* ((Rt_1-Rt_2))/((W_1+W_2))$

Where, $R_s$ = resolution

$(Rt_1-Rt_2)$ = Difference between the retention times of two components.

$W_1+W_2$ = Spot widths of two components.

The perfect resolution is considered as 100.

Here, we are given that the two components in a mixture both have a resolution at 2.0 that means both the peaks are overlapping each other and thus the components cannot be determined accurately.

Thus, this does not represent a good separation as as the two components are spotted closely.

Final answer:

A resolution of 2.0 in TLC separation indicates good separation, as values of 1.0 or higher are generally acceptable. It demonstrates that the mixture's components have been well resolved on the chromatogram, and each component can be distinctly identified.

Explanation:

A resolution of 2.0 in TLC separation indicates good separation of a two-component mixture. In chromatography, resolution measures how well two components in a mixture are separated based on their differences in migration rates on the chromatogram. A resolution value of 1.0 or above is generally acceptable, with higher values indicating better separation. In your case, a resolution of 2.0 suggests that the two components have been well resolved, with each peak being distinctly separated from the other, allowing for easier identification and quantification.

Additionally, the effectiveness of separation can often be improved by repeating the separation process. This iterative approach is based on the Le Chatelier's principle, which involves upsetting the phase distribution equilibrium to achieve a higher purity product. Such methods are also touched upon when discussing column chromatography and repetitive extraction protocols in automated systems.

Learn more about TLC Separation Resolution here:

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Calculate the entropy change for the gas. (2b)Calculate the entropy change when 14 g of nitrogen expand from a volume of 10 L to a volume of 30 L at the same temperature. Assuming ideal behaviour for the nitrogen gas