What is the pH of a 3.50 x 10^-3 M NaOH solution

Answer:

I think its city y, I don't know if its right though.

Explanation:

Answer:

a) Trichloromethyl

b) Trinitrogen Pentoxide

c) Carbogen

Explanation:

Iodine-131  is a radioactive element  which keeps on decaying over the time. Decay of radioactive element always comes under first order kinetics. Therefore 16.2mg mass would be available after 48 days if a hospital has a 750mg sample of it available.

Half life tells about the time at which the radioactive material decays to half of its initial concentration.

Mathematically, for first order reaction, the relationship between half life and rate constant can be given as

[tex]t_{1/2} = \frac{0.693}{K}[/tex]

where k = rate constant

[tex]t_{1/2} \\[/tex]= half life= 8 days

Substituting the given values

k=0.693÷8 =0.08days⁻¹

[tex]k=\frac{2.303}{t}log\frac{a}{a-x}[/tex]

a= initial concentration

a-x = final concentration after 48 days

[tex]0.08=\frac{2.303}{48 }log\frac{ 750}{a-x}[/tex]

solving this we get

a-x= 16.2mg

Therefore, 16.2mg mass would be available after 48 days if a hospital has a 750mg sample of it available.

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Answer:

answering what???

Explanation:

Answer:

I answered

Explanation:

Answer: you will need 400 potatoes

Explanation:

Answer:

18 g...i think 90 percent sure its 18

Answer:

habitat change, climate change, invasive species, and pollution

Explanation:

Answer:

I’m looking for an answer aswell

Explanation:

Answer: a computer

Explanation:

Explanation:

Avogadro's number. What can be said about 1 mol Ag and 1 mol Au? ... They contain the same number of atoms.

1 mole of Ag and 1 mole of Au contain the same number of particle. Therefore, option B is correct.

The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities.

A mole is defined as the mass of a substance that has the same number of elementary particles as there are atoms in precisely 12.000 g of 12C.

In the periodic chart, group 11 includes the chemical elements roentgenium (Rg), copper (Cu), silver (Ag), and gold (Au). However, no chemical tests have yet been done to demonstrate that roentgenium behaves similarly to the heavier homologue of gold.

Thus, option B is correct.

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Answer:

2J/g°C

Explanation:

Q = 5000J

Initial temperature (T1) = 20°C

Final temperature (T2) = 70°C

Specific heat capacity (c) = ?

Heat energy (Q) = mc∇T

Q = mc∇T

Q = mc(T2 - T1)

5000 = 50 × c × (70 - 20)

5000 = 50c × 50

5000 = 2500c

c = 5000 / 2500

c = 2J/g°C

The specific heat capacity of the substance is 2J/g°C

Answer:

positive

Explanation:

Explanation:

A proton has positive charge ...

Answer:

0.46M NaS₂O₃ (Assuming KIO₃ solution with a concentration of 1.0M)

Explanation:

Based on the reaction:

6 Na₂S₂O₃ + KIO₃ + 5 KI + 3 H₂SO₄ → 3 Na₂S₄O₆ + 3 H₂O + 3 K₂SO₄ + 6 NaI

6 moles of  Na₂S₂O₃ react per mole of KIO₃

Assuming the molarity of the KIO₃ solution is 0,1M:

Moles of KIO₃: = 5.0x10⁻³L ₓ (0.1 mol / L) = 5.0x10⁻⁴ moles

As 6 moles of thiosulfate reacted per mole of iodate:

5.0x10⁻⁴ moles KIO₃ ₓ (6 moles Na₂S₂O₃ /  1 mole KIO₃) =

3.0x10⁻³ moles of Na₂S₂O₃. In 6.5mL (6.5x10⁻³L):

3.0x10⁻³moles Na₂S₂O₃ / 6.5x10⁻³ L = 0.46M NaS₂O₃

Answer:

Paratroopers not hurt while landing because when they get to the ground, they keep their knees and feet together helping them to land properly.

hope it helps!

Answer:

they usually land on their knees and roll

Explanation:

Answer:

2-Methyl-5-nitrothiophene  

Explanation:

The 2- and 5-positions of thiophene are the most susceptible to electrophilic aromatic substitution.

Thus, the major product from the reaction of 2-methylthiophene with HNO₃ in acetic acid is 2-methyl-5-nitrothiophene.

Answer: The volume of product formed is 0.26 L

Explanation:

[tex]\text{Moles of solute}=\frac{\text{given mass}}\times{\text{Molar Mass}}[/tex]    

[tex]\text{Moles of} H_2=\frac{0.02g}{2g/mol}=0.01moles[/tex]

[tex]2H_2(l)+O_2(l)\rightarrow 2H_2O(g)[/tex]

As [tex]O_2[/tex] is the the excess reagent, [tex]H_2[/tex] is the limiting reagent as it limits the formation of product.

According to stoichiometry :

2 moles of [tex]H_2[/tex] give = 2 moles of [tex]H_2O[/tex]

Thus 0.01 moles of [tex]H_2[/tex] will give =[tex]\frac{2}{2}\times 0.01=0.01moles[/tex]  of [tex]H_2O[/tex]

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 101.325 kPa = 1 atm

V = Volume of gas = ?

n = number of moles = 0.01

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]40^0C=(40+273)K=313K[/tex]

[tex]V=\frac{nRT}{P}[/tex]

[tex]V=\frac{0.01mol\times 0.0821L atm/K mol\times 313K}{1atm}=0.26L[/tex]

Thus the volume of product formed is 0.26 L

Answer:

3.46

Explanation:

-log(3.50*10^-4) = 3.46

Answer:

Helium is lighter than Hydrogen and Helium is a much safer gas.

Answer:

Helium gas is known to be very light which makes it a preferred choice to hydrogen. Helium has low boiling point, low density, low solubility, high thermal conductivity and inertness. Since it is less dense, it is considered suitable for filling balloons.

Answer:

5 is the answer since I did this and got it rigt

Answer:

D. decreased biodiversity

Explanation:

Habitat loss due to the increasing human

population has caused decreased biodiversity

Answer:

B

Explanation:

The answer is substitution

Answer:

400000

Explanation:

First, figure out what 10^5 is. It is 100000. Then multiply it by 4 and there is your answer!

Also if it is 4x10^-5, it is 0.00004!

Oh yeah! If you want it to be in scientific notation, it is: 4x10^5

Since that I didn't quite understand what you are trying to question, it is either 4x10^5 or 4x10^-5!

Answer:

When an acid and a base react with each other, a neutralization reaction occurs, forming a salt and water. The water forms from the combination of the H + ions from the acid and the OH - ions from the base. Strong acids and strong bases completely dissociate, so the reaction yields a solution with a neutral pH (pH = 7).

Explanation:

When solid surfaces slide over each other, the kind of friction that occurs is called Sliding Friction.

Answer:

Pluto is farthest from the sun and hence it receives extremely low energy of sun. The surface temperature of Pluto is about -240 !!!

Answer:

C. It is nonspontaneous and requires an electric current.

Explanation:

Electroplating refers to the process of coating a metal on the surface of another metal. Electroplating may be carried out to improve the properties of a metal or to preserve it from corrosion.

Electroplating involve the process of electrolysis. In electrolytic cells, electrical energy causes nonspontaneous reactions to occur in a process known as electrolysis. Electrolytes are decomposed during electrolysis by the passage of direct current to form ions.

The entire process of electrolysis is non spontaneous. It requires the input of electric electric current. This is achieved by connecting a battery to supply energy to drive the non spontaneous process.

Answer: Yes we agree with the student's claim.

Explanation:

When the molecules are present in smaller size, more reactants can react as decreasing the size increases the surface area of the reactants which will enhance the contact of molecules.Hence, more products will form leading to increased rate of reaction.

On increasing the temperature will make more reactant molecules will have sufficient energies to cross the energy barrier and thus the number of effective collisions increases, thus leading to more products and increased rate of reaction.

When the solution is stirred , the molecule's kinetic energy and thus the rate of reaction increases.

Thus smaller size, stirring and increase of temperature will make the solution quickly.

Answer:A unit rate describes how many units of the first type of quantity corresponds to one unit of the second type of quantity. Some common unit rates are miles (or kilometers) per hour, cost per item, earnings per week, etc.

Explanation: hope this helps mark as brainiest

Answer: Because it's a combination of chemicals, vodka doesn't freeze at the same temperature as either water or alcohol. Of course, vodka will freeze, but not at the temperature of an ordinary freezer. This is because vodka contains enough alcohol to lower the freezing point of water below the -17°C of your typical freezer.

Explanation: .......