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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:

58,5

Explanation:

Answer:

omg my friends name is Noah

Explanation:

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:

(I). Evaporation

(ii). Sublimation

Answer:

The pH of the solution increases

Explanation:

One of the properties of metals is that they react with water to yield hydrogen gas and the hydroxide of the metal.

Calcium is a metal in group two of the periodic table and also undergoes such reaction.

The equation of the reaction is;

Ca(s) + 2H2O(l) -----> Ca(OH)2(aq) + H2(g)

Since Ca(OH)2 is alkaline, the pH of the solution increases.

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:

electric charges.

Explanation:

Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction.

An electron can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.

An electric current is produced when electric charges (electrons) move continuously and it's measured in Amperes through the use of an ammeter.

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

[tex] V = IR[/tex]

Where;

V represents voltage measured in voltage.

I represents current measured in amperes.

R represents resistance measured in ohms.

Answer:

Titration 1=33.9ml

Titration 2=33.45ml

Titration 3=33.35ml

Explanation:

Volume of NaOH used =Final reading - Initial reading

Titration 1:

Final reading =35.5ml

Initial reading=0.6ml

Volume of NaOH used =34.5ml -0.6ml=33.9ml

Titration 2:

Final reading =34.3ml

Initial reading=0.85ml

Volume of NaOH used =34.3ml -0.85ml=33.45ml

Titration 3:

Final reading =33.8ml

Initial reading=0.45ml

Volume of NaOH used =33.8ml 0.45ml=33.35ml

Hope it helps:)

Answer:

Red dwarfs

Explanation:

Hope it helps!

Sodium Carbonate, Sodium Bicarbonate or Sodium Hydroxide.

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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:

The answer is A

Explanation:

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

Answer:

48.00

Explanation:

3 oxygen (15.99 x 3)= 48

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:

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.

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Answer:

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

Answer:

2LiNO3 + CaBr2 → Ca(NO3)2 + 2LiBr

Explanation:

Answer:

im pretty sure its d

Explanation:

The volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide is 10.8ml , option B is the correct answer.

What is Molarity ?

Molarity is defined as the amount of solute (in moles)in per litre of solution.

It is also known as molar concentration of a solution , It is expressed in mol/l .

[tex]\rm M=\dfrac{n}{V}[/tex]

where n is the number of moles

and V is the volume in litres.

We can rearrange this equation to get the number of moles:

n= M * V

The molarity of calcium bromide is 0.064 M and the volume given is 35 ml,

the moles will be n = 0.064 * 35 = 2.24 moles

2AgNO₃(aq) + CaBr₂(aq) → 2AgBr(s) + Ca(NO₃)₂(aq)

From the reaction we can see that for every 1 mole of Calcium Bromide 2 moles of Silver Nitrate is needed , so for 2.24 moles 4.48 moles will be needed.

The molarity is given as 0.415 M and the number of moles is 4.48 so the volume required can be calculated from the above formula

[tex]\rm V=\rm\dfrac{n}{M} \\\\V=\rm\dfrac{4.48}{0.415} \\\\V= 10.8 ml\\[/tex]

Hence the volume (in mL) of 0.415M silver nitrate will be required to precipitate as silver bromide is 10.8ml , option B is the correct answer.

To know more about Molarity

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Answer:

Water particles are close together and move slowly past each other

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.

Explanation:

Hope it's helpful for Yuh bro!!

Answer:

Friendship is, in many respects, a "comfortable" love relationship. Friendships involve as little or as much intimacy as the partners are inclined to express at any given time. Friends are not normally obligated to exchange benefits, but do so in ways that are often so natural as to be unwitting. The ties that bind them are by unfettered mutual consent. In spite of its being so comfortable, in fact because of it, friendship contributes in unique ways .

Answer:

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

Answer:

CH4

Explanation:

because it CH4 have lesa mass than that of O2

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.