Please help me. I am doing a test and, I don’t know this one.

Answer:

A

Explanation:

Electrolysis has to do with the decomposition of a solution by the passage of direct current through it. Current enters and leaves the electrolyte via electrodes.

The positive electrode is called the anode while the negative electrode is called the cathode. Positive ions move towards the cathode while negative ions move towards the anode.

Cu^2+ moves towards the cathode and accepts two electrons to be deposited on the cathode as metallic copper. Also, Cl^- ions move towards the anode and gives up electrons to become oxidized to chlorine gas.

Hence in the electrolysis of CuCl2, copper is obtained at the cathode while chlorine gas is obtained at the anode. Hence 1 and 3 are correct statements.

Sodium Carbonate, Sodium Bicarbonate or Sodium Hydroxide.

Answer:

Radical is a charged ion

the types are cation and anion.

cation is positively charged and anions are negatively charged

Explanation:

Answer:

The correct answer is - C. 0.500 mg.

Explanation:

In this case, the half-life of the iodine-131 is 8 days and the initial amount is given 4 mg. According to this after every 8 days, half of the initial value of the iodine-131 remains only.

8 days or 1st half-life = A(i)* 1/2

16 days or two half-life = A(i)* 1/4

24 days or three half-life = A(i)* 1/8

and the remaining amount A would be

= A(i)*1/2^n

= 4 * 1/2^3

= 4 *1/8

= 0.500 mg

Answer:

23.5 grams of AlBr3 will be produced by 27.20 grams of NaBr

Explanation:

The balanced equation here is

6NaBr + 1AlO3 = 3Na2O + 2AlBr3

6 moles of NaBr are required to produce 2 moles of AlBr3

Mass of one mole of NaBr = 102.894 g/mol

Mass of one mole of AlBr3 = 266.69 g/mol

Mass of 6 moles of NaBr = 6*102.894 g/mol

Mass of two moles of AlBr3 = 2*266.69 g/mol

6*102.894 g  NaBr produces 2*266.69 g of AlBr3

23.5 grams of AlBr3 will be produced by (6*102.894)/(2*266.69 )*23.5 = 27.20 grams of NaBr

Answer:

omg my friends name is Noah

Explanation:

Answer:

The answer is A

Explanation:

A had higher frequency and higher the frequency of an object the higher its pitch still be

Answer:

CH4

Explanation:

because it CH4 have lesa mass than that of O2

Answer:

Your answer would be D, Hope this helps.

Answer:

between 5 and 5.5

Explanation:

Answer:

between 5.0 and 5.5

Explanation:

between 5.0 and 5.5

Answer:

(I). Evaporation

(ii). Sublimation

Answer:

HCl

H3PO4

Explanation:

The formula of hydrochloric acid is HCl. It contains one hydrogen and one chlorine atom. And thus all other options with O is wrong and option C is correct.

What is hydrochloric acid?

Hydrochloric acid is a strong acid having the formula HCl. Thus one mole of hydrochloric acid contains one hydrogen atom and one chlorine atom. No other elements such as oxygen is present in it.

The electronegativity of chlorine is very higher compared to hydrogen  and they attracts by hydrogen bond. Each atom shares one electron with the other atom and thus it can also said as they are covalently bonded.

Hydrochloric acid is used in many industrial uses and it is present even in our stomach to aid digestion. Since it is very strong acid it may cause sever damages to skin if and its vapor causes respiratory issues when comes in contact.

Therefore, the correct formula of hydrochloric acid is HCl, option C is correct.

To find more about HCl, refer the link below:

https://brainly.com/question/24177034

#SPJ5

Answer:

first is c and second is a

Answer:

2LiNO3 + CaBr2 → Ca(NO3)2 + 2LiBr (balanced equation)

Answer:

2LiNO3 + CaBr2 → Ca(NO3)2 + 2LiBr

Explanation:

Answer:

Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles. The difference in mass between the reactants and products is manifested as either the release or the absorption of energy. 

Explanation: Read this and you might be able to figure it out for yourself ☺️☺️☺️

Answer:

nnnnaaaoooo. seeeeiiii!!!!!!b k ibhhgj

Answer:

Yes, it can.

Explanation:

The percentage yield is decreased if the reactants do not completely form the products. To make a given mass of product, a process with a low percentage yield requires more of the reactants than a process with high percentage yield.

Answer:

Red dwarfs

Explanation:

Hope it helps!

Answer:

The pH of the pure water is not always neutral but actually sometimes it can be slightly acidic but not of the same extent or value as HCl obviously. However ,it is enough to result to a color change in the presence of phenolphthalein.

Explanation:

I will try to be brief and spare the boring details .Basically ,this is caused by the reaction of water and CO2 that is naturally present in the atmosphere to produce a weak acid known as carbonic acid.

~Hope this helps:)

Answer:

a bacterium with a rigid spiral structure,found in stagnant water and something causing disease

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In a displacement reaction, more reactive element displaces less reactive element from its compound and from the above reaction we observed that, Chlorine displaces bromine from its compound (KBr) to form Potassium chloride (KCl), therefore Chlorine is more reactive non - metal.

The equation for above reaction is :

[tex] \large\boxed {\mathrm{2KBr + Cl_2 \rightarrow 2KCl + Br_2}}[/tex]

_____________________________

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Answer:

chung long

Explanation:

cause 3 plus 2 =9

Answer: The new volume of the air in the syringe is 7.3 mL.

Explanation:

Given: [tex]V_{1}[/tex] = 2.0 mL,     [tex]P_{1}[/tex] = 1.02 atm,          [tex]T_{1} = 22^{o}C[/tex]

[tex]V_{2}[/tex] = ?,               [tex]P_{2}[/tex] = 1.27 atm,               [tex]T_{2} = 100^{o}C[/tex]

Formula used to calculate the new volume in syringe is as follows.

[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex]

Substitute the values into above formula as follows.

[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}\\\frac{1.02 atm \times 2.0 mL}{22^{o}C} = \frac{1.27 atm \times V_{1}}{100^{o}C}\\V_{1} = 7.3 mL[/tex]

Thus, we can conclude that the new volume of the air in the syringe is 7.3 mL.

Answer:

Nitrogen and Argon

Explanation:

These gases are part of a class of "noble" gases because they don't react with anything.