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anastassius [24]

3 years ago

8

The electromagnetic waves with the shortest wavelengths and the highest frequencies are called: a. ultrasonic waves. c. x-rays.

b. microwaves. d. gamma rays. Please select the best answer from the choices provided A B C D

1 answer:

nika2105 [10]3 years ago

6 0

The answer would be D) gamma rays

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What happens at the anode in an electrolytic cell?

Llana [10]

Answer:

D. Oxidation

Explanation:

In an <em>electrolytic cell</em>, oxidation (the loss of electrons) takes place at the anode. At the cathode reduction takes place.

A mnemonic technique that could be used is that the process that starts with a vowel (Oxidation) takes place at the place that also starts with a vowel (Anode).

7 0

3 years ago

Calculate the pH of a buffer solution created by reacting 100 mL of 0.1 M NH3 with 90 mL of 0.1 M HNO3. (Remember, you can find

algol13

This question is asking for the pH of a buffer solution between ammonia and nitric acid, with given volumes and concentrations. At the end, the result turns out to be 10.488.

<h3>Buffers</h3>

In chemistry, buffers are known as substances attempting to hold a relatively constant pH by mixing and acid and a base (weak and strong). In such a way, for the substances given, the first step will be to calculate the consumed moles as they are mixed:

$n_{NH_3}=0.1L*0.1mol/L=0.01mol\\\\n_{HNO_3}=0.09L*0.1mol/L=0.009mol$

Now, since ammonia is in a greater proportion, one can calculate how much of it is left after being consumed by the nitric acid:

$n_{NH_3}^{left}=0.01mol-0.009mol=0.001mol$

And its new concentration:

$[NH_3]=\frac{0.001mol}{0.1L+0.09L} =0.00526M$

Next, with ammonia's ionization:

$NH_3+H_2O\rightleftharpoons NH_4^++OH^-$

We set up the equilibrium expression based on ammonia's Kb:

$Kb=\frac{[NH_4^+][OH^-]}{[NH_3]}$

Which can be solved by introducing x and using ammonia's Kb:

$1.8x10^{-5}=\frac{x^2}{0.00526M}\\ \\$

Then, we solve for x which is also equal to the concentration of ammonium and hydroxide ions in the solution:

$x=\sqrt{0.00526*1.8x10^{-5}}=0.000308M$

Ultimately, we calculate the pOH and then turn it into pH with:

$pOH=-log(0.00308)=3.512\\\\pH=14-3.512=10.488$

Learn more about buffers: brainly.com/question/24188850

6 0

2 years ago

If a 40 g sample of NaCl is composed of 39.34% Sodium, how many grams of<br> that sample are Sodium?

alina1380 [7]

Answer:

15.7g

Explanation:

mass percent=mass of element/mass of compound *100

39.34=unknown(x)/40g×100

39.34=5x/2

multiplying both sides by 2,we get

5x=78.68

devide by 5 on both sides

x=15.74g Na

4 0

3 years ago

43. Which of the following statements concerning the action of G proteins on adenylate cyclase is true? I. G proteins always ser

ExtremeBDS [4]

Answer:

Some G proteins activate adenylate cyclase, while others inhibit it.

Explanation:

G proteins helps in the signal transduction process that transfer message in the body. GPCRs (G-protein-coupled receptors) are located on the surface membrane of the cell.

The G protein can activates the protein or might deactivate the proteins that helps in the adenylate cyclase. The particular phosphorylation and dephosphorylation process at different sites by the G proteins can result in activation and inactivation of adenylate cyclase.

Thus, the correct answer is option (C).

8 0

4 years ago

If 150 G of war started burning 300 G of where as was left behind how many grams of CO2 gas is released

denis23 [38]

Answer:

geruow0irghvn3p0unhie0ghik

Explanation:

5 0

3 years ago