Calculate the approximate amount os sodium hydroxide needed to make 500ml if a. 3 naoh solution.

The half-life of sr-89 will be 51 days.

To learn more about beta decay strontium-89 click here-

https://brainly.com/question/26626062

#SPJ4

The mass of the solution is equal to 120 g. As the salt dissolves in water so it disappears when the solution is formed.

The salt dissolves in water at the molecular level, due to electrical charges. Due to this fact that both water and salt are polar, with positive and negative charges on opposite sides of their molecule. The bonds in salt are ionic and have an electrical charge.

Likewise, a water molecule is also ionic in nature, but the covalent bonds are present with two hydrogen atoms and one oxygen atom, which has a negative charge. The salt dissolves because the covalent bonds of water molecules are stronger than the ionic bonds present in the salt molecules.

The mass of the given salt is equal to 20 g while the mass of water is 100g. The total mass of the solution is equal to the sum of the mass of the solute and the mass of the solvent. Therefore, the mass of the solution will be equal to 120 grams whether the salt gets dissolved in water and get disappeared.

Learn more about salt dissolution, here:

https://brainly.com/question/14515128

#SPJ5

Answer:

Red

Explanation:

Red color is evidenced when thymol blue indicator is in a solution having a pH of 11. A pH of 11 means that the solution is basic or alkaline. Therefore, the indicator turns red, indicating that the solution is alkaline.

When thymol blue indicator is in a acidic solution, the indicator remains blue.

Molality of ethylene glycol, C₂H₄(OH)₂, in a solution prepared from 2. 331×10³ g of ethylene glycol and 2.00×10³ g of water, H₂O is 47.6m

Ethylene Glycol is known as C₂H₄(OH)₂. It is added in water to prepare an Antifreeze solution.

Given,  

Mass of Ethylene Glycol = 2.331 × 10³ g = 2.331kg

Mass of Water = 2.00 × 10³ g

Since, Ethylene Glycol is in excess. Hence, it acts as a solvent and water acts as a solute.

We know, Molar Mass of Water = 18g

Hence, Moles of  Water = Given mass of water / Molar Mass of Water

⇒             Moles of  Water = 2000 / 18

⇒            Moles of  Water = 111.1

Molality is defined as the moles of solute present in a given solvent in kg.

∴ Molality = Moles of  Solute / Mass of Solvent (in kg)

Molality = Moles of  Water / Mass of Ethylene Glycol

⇒ Molality = 111.1 / 2.331

⇒ Molality = 47.6m

Molality of ethylene glycol, C₂H₄(OH)₂, in a solution prepared from 2. 331×10³ g of ethylene glycol and 2.00×10³ g of water, H₂O is 47.6m

Learn more about Molality here, https://brainly.com/question/17034043

#SPJ4

When a 45-minute road trip a vehicle emitted 16.7 g of nitrogen dioxide (NO₂) from its exhaust then the mass of nitrogen atoms in this amount of NO₂ would be 5.082 grams.

The chemical compound is a combination of two or more either similar or dissimilar chemical elements.

for example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom

The molecular mass of any compound is calculated by the sum of the mass of the individual atom

As given in the problem In a 45-minute road trip a vehicle emitted 16.7 g of nitrogen dioxide (NO₂) from its exhaust

The molecular mass of the NO₂ is the sum of the mass of the nitrogen atom and the oxygen atom.

The mass of the single nitrogen atom is 14, while the mass of the single oxygen atom is 16

the molecular mass of NO₂= mass of the N atom+2×(mass of O atom)

                                     = 14 + 2×16

                                     =46

As 46 grams of NO₂ contain 14 grams of Nitrogen

then 1 gram of NO₂ would  contain 14/46  grams of Nitrogen

then 16.7 grams of NO₂ would  contain (14/46×16.7)  grams of Nitrogen

The mass of a nitrogen atom in 16.7 grams of NO₂ would be 5.082 grams

Learn more about a chemical compound

brainly.com/question/12166462

#SPJ4

Pt195 having 78 atomic number is the daughter nucleus produced when Au195 undergoes electron capture.

An unstable isotopes can undergoes radioactive decay to form a more stable isotopes . Initial isotopes is called parent nuclide and the resultant isotopes from radioactive decay is called the daughter nuclide There are several radioactive decay like alpha decay , beta decay  , gamma decay , electron capture etc .

In electron capture , the atom have only one less which is daughter isotopes than electron than atomic number of parent isotopes.

learn more about isotopes,

https://brainly.com/question/11680817

#SPJ4

No, gamma radiation is only slightly deflected by magnets so it would still hit you if you were close to the magnets. That is option C.

Magnetic levitation which is also called magnetic suspension is defined as the phenomenon in which two magnetic objects are repelled from each other in a vertical direction.

Gamma radiation is defined as a type of electromagnetic wave with the highest energy and shortest wave length.

The gamma rays do not possess any charge and therefore are not affected by electric or magnetic fields.

Therefore, when gamma radiation is mistakenly emitted directly at you, passing through the magnets first, it will still hit you because the ray are only slightly deflected by magnets.

Learn more about magnets here:

https://brainly.com/question/27862911

#SPJ1

It take a larger partial pressure difference for oxygen to dissolve in plasma vs carbon dioxide because of its much higher solubility in plasma.

Partial pressure is defined as the pressure of anyone gas that arises in the container with more than one gas and each gas exert pressure. Partial pressure is calculated only for gases which is exist in the same volume.

Oxygen dissolve in plasma because oxygen exerts a certain amount of partial pressure. Plasma cannot carry much oxygen because of its solubility.

Thus from the above conclusion we can say that It take a larger partial pressure difference for oxygen to dissolve in plasma vs carbon dioxide because of its much higher solubility in plasma.

Learn more about the Partial Pressure here: https://brainly.com/question/19813237

#SPJ4

Explanation:

(e)the heat is absorbed into the reaction .

Solution is the term which best describes mixture A which was made by mixing different components together but has only one phase.

Learn more about solution here:

https://brainly.com/question/13812915

#SPJ4

The optimum pH of formic acid - formate buffer is 3.75

What is Buffer ?

A substance or a solution which resists any changes in pH, when acid or alkali is added to it.

pH = pKa + log[base] / [acid]

Considering equimolar concentration of acid and base

pH = 3.75 + log(x)/(x)

pH = 3.75 + log (1)

pH = 3.75 + 0

pH = 3.75

Hence,

The optimum pH of formic acid - formate buffer is 3.75

Learn more about pH here:https://brainly.com/question/16036689

#SPJ4

climate

Changes in the composition of the atmosphere have caused gradual changes in earth's climate throughout history, causing changes in plant and animal life that contributed to mass extinctions.

The following are some of the reasons:

heat

To learn more about the changes in earth visit:

https://brainly.com/question/13434833?

#SPJ4

The  Cm of the Microsand concentration in the tanks when expressed in grams of Microsand per liter (g/L) is known to be 3.8 g/L.

This is known to be a kind of  aggregate, that is said to be exempted from clay and shale and it is one that can rightly fine to pass via a No. 100 (that is 150 µm) sieve.

Note that from the question:

The Average of six samples = 30mg/L.

Then one need to Multiply:

30 by 300gpm x 1 Train x 1700 ( this is the use of the bulk density conversion factor).

Then one need to also Divide by (4000 gpm x 2000 mL) =  1.8 g/L.

Lastly you then multiply by 2,

1.8 g/L x 2  = 3.8 g/L.

Therefore, looking at the solution above, the Cm of the Microsand concentration in the tanks  is seen to be 3.8 g/L.

Learn more about flocculation from

https://brainly.com/question/15057637

#SPJ1

The molar absorptivity () of benzoic acid at 228 nm? assume that the path length is 1. 00 cm is = 11178 M-1. cm-1

We are given, absorbance spectrum and from that the absorbance of benzoic acid at 228 nm

Absorbance = 0.8

Now we need to calculate the molar absorptivity of benzoic acid at 228 nm

We know at the 228 nm the A = 0.8 and C = 8.74 mg/L.

We also given the l = 1 cm

Moles of benzoic acid = 0.00874 g / 122.12 g.mol-1

                                  = 7.16*10-5 moles

So, C of benzoic acid = 7.16*10-5 moles / L

We know the

ε = A/C*l

 = 0.80 / 7.16*10-5 M. 1 cm

 = 11178 M-1. cm-1

Learn more about  molar absorptivity here:-https://brainly.com/question/13350541

#SPJ4

Chemistry deals with elements and compounds. The properties of matter, changes to matter, and composition of matter are studied in chemistry. Thus, options a, b, and d are correct.

Chemistry is said to be a scientific field under natural sciences that studies the structure, properties, and composition of matter.  It includes atoms, elements, and compounds.

The chemistry includes topics like the properties of matter, including the volume, density, temperature, etc., changes to a matter involving condensation, freezing, vaporization, melting, etc.

The composition of matter including the sub-atomic levels is studied in chemistry. Whereas, the interactions between living things are studied in biology.

Therefore, options a, b, and d. the properties, changes, and composition are studied in chemistry.

Learn more about chemistry here:

https://brainly.com/question/5243081

#SPJ2

Answer:

3.3 x 10⁻¹⁷ Hz    

Explanation:

To find the frequency, you can use the following equation:

E = h / f

In this equation,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> f = frequency (Hz)

You can plug the given values into the equation and simplify to find the frequency. This equation will require a little bit of rearranging.

E = h / f                                                        <----- Given equation

(2.0 x 10⁻¹⁷ J) = (6.626 x 10⁻³⁴ J*s) / f         <----- Insert values

(2.0 x 10⁻¹⁷ J) x f = (6.626 x 10⁻³⁴ J*s)        <----- Multiply both sides by f

f = 3.3 x 10⁻¹⁷ Hz                                        <----- Divide both sides by 2.0 x 10⁻¹⁷

The frequency of an x-ray wave with an energy of 2.0 x 10^-17 J is 3.3 x 10⁻¹⁷ Hz.

The term frequency is defined as the number of waves that pass a fixed point in unit time. Frequency is measured in hertz which is equal to one event per second.

Frequency also describes the number of cycles undergoes during one unit of time by a body in periodic motion.

Calculating the frequency, you can use the following equation:

E = h / f

Where,

E = energy (J)

h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

f = frequency (Hz)

Insert his values in the given equation

(2.0 x 10⁻¹⁷ J) = (6.626 x 10⁻³⁴ J × s) / f        

(2.0 x 10⁻¹⁷ J) x f = (6.626 x 10⁻³⁴ J × s)        

f = 3.3 x 10⁻¹⁷ Hz                

Thus, The frequency of an x-ray wave with an energy of 2.0 x 10^-17 J is 3.3 x 10⁻¹⁷ Hz.

To learn more about the frequency, follow the link;

https://brainly.com/question/5102661

#SPJ2

Answer:

An increase in the intensity of sounds or fire issuing from a relief valve.

Propane serves as the propellant in all aerosols. R-12, a Freon that was the previous propellant, has been outlawed because it harms the ozone layer above the poles. Propane and R-12 share the same pressure-temperature characteristics.

Propane's boiling point is quite low. It desires a boil-off at ambient temperature. And it continues to do so until the pressure inside a closed container rises to roughly 150 psi (give or take depending on temperature), at which time the boiling point is raised high enough to cause the substance to stop boiling.

"Contents Under Pressure" is exactly what the notice indicates. Paint, hairspray, lubricant, wasp and hornet spray, among other liquids, can be found within an aerosol can, which is a pressure vessel. By inspecting the bottom, you may determine whether a vessel is a pressure vessel. If it is dished in like a bowl, it has the same pressure-holding end as a huge propane tank, with the exception that the curve on the latter has an outward orientation. On aerosol canisters, it is inward because they must sit upright for ease. A circular bottom just cannot accomplish that. But the top resembles an outer hemisphere more or less.

Thank you,

Eddie

For calculating mean value, add up all of the values then divide by the number of them. 815/9 is about 90.6

The mean refers to the average of a set of values. The mean can be computed in a number of ways, including the simple arithmetic mean (add up the numbers and divide the total by the number of observations), the geometric mean, and the harmonic mean.

Moreover, the mean can be used to represent the typical value and therefore serves as a yardstick for all observations. For example, if we would like to know how many hours on average an employee spends at training in a year, we can find the mean training hours of a group of employees.

Hence, the mean can be calculated only for numeric variables, no matter if they are discrete or continuous. It's obtained by simply dividing the sum of all values in a data set by the number of values.

Learn more about mean value:

https://brainly.com/question/14882017

#SPJ2

Answer:

136 g Al₂O₃

Explanation:

Assuming you do not need to find the limiting reactant, to find the mass of Al₂O₃, you need to (1) convert grams O₂ to moles O₂ (via molar mass), then (2) convert moles O₂ to moles Al₂O₃ (via mole-to-mole ratio from equation coefficients), and then (3) convert moles Al₂O₃ to grams Al₂O₃ (via molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value (64.0 g).

Molar Mass (O₂): 32 g/mol

Molar Mass (Al₂O₃): 102 g/mol

4 Al + 3 O₂ -----> 2 Al₂O₃

64.0 g O₂           1 mole           2 moles Al₂O₃            102 g
-----------------  x  --------------  x  ------------------------  x   -------------  =  136 g Al₂O₃
                             32 g               3 moles O₂             1 mole

Answer:

Explanation:

Based of the fact that you were given 2 masses I would assume this to be a limiting reagent question. However amount on the left side both equal 2. Ignoring limiting reagents and focusing on just O2 the steps would be:

1. Make sure the equation is balanced ( already given)

2- Use given values to find the mols of O2 (mass/molar mass)

3. Mols are conserved but due to the coefficients the molar value from O2 must be divided by three and multiplied by 2 to ensure proper ratios

4. Using that amount the mass can derived using amount/molar mass

5. Use proper significant digits and units(3 in this case)

The pH of a 0.50 M solution of base B is found to be 10.19. The Kb of the base is 4.8 × 10⁻⁸.

Let's consider the following basic reaction.

B(aq) + H2O(l) ⇄ BH(aq) + OH⁻(aq)

First, we will calculate the pOH of the solution using the following expression. (14-10.19)=3.81

antilog -3.81=1.55×10^-4/0.50=4.8×10^-8

The pH of a 0.50 M solution of base B is found to be 10.19. The Kb of the base is 4.8 × 10⁻⁸.

Learn more about  Kb for this base here brainly.com/question/6465134

#4262

The [tex]K_b[/tex] of the base b is 4.805 × 10⁻⁸.

The dissociation constant is a type of equilibrium constant that measures the degree of dissociation of a salt.

[tex]K_a[/tex] is the dissociation constant for the acid which describes the strength of an acid.

[tex]K_b[/tex] is the dissociation constant of the base which describes the strength of a base.

pOH = 14 - pH = 14 - 10.19 = 3.81

pOH = -log[OH⁻]

3.81 = -log[OH⁻]

Antilog (-3.81) = [OH⁻]

[OH⁻] = 1.55 × 10⁻⁴

Here,

[tex]K_b= \frac{[BH^+][OH^-]}{[B]}[/tex]

     = [tex]\frac{(1.55\times10^{-4})(1.55\times10^{-4})}{0.50}[/tex]

     = 4.805 × 10⁻⁸

The Kb of the base b is 4.805 × 10⁻⁸

Learn more about dissociation constant:

https://brainly.com/question/9560811

#SPJ4

The volume occupied by 22. 0 g of helium gas at 26. 0 ° C and 1. 20 atm of pressure is 112.37 L .

Calculation ,

According to ideal gas equation ,

PV = nRT        ....(i)

where P is the pressure = 1. 20 atm

V is the volume of the helium gas = ?

R is the universal gas constant = 0.082 atm L /K mol

T is the temperature of the gas =  26. 0 ° C = 299 K

n is the number of moles

Number of miles (n)  = given mass/ molar mass =22 g/4 = 5.5 moles

By putting the value of pressure , volume , temperature and  universal gas constant  in equation ( i) we get

1. 20 atm ×V = 5.5 moles × 0.082×299

V = 5.5 moles × 0.082×299/1. 20 atm = 112.37 L

To learn more about helium gas please click here ,

https://brainly.com/question/13645498

#SPJ4

Answer:

0.453 moles

Explanation:

The Ideal Gas Law equation looks like this:

PV = nRT

In this formula,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = moles

-----> R = Ideal Gas Constant (0.08206 atm*L/mol*K)

-----> T = temperature (K)

To find the amount of moles of gas, you can plug the given values into the equation and then simplify.

P = 2.7 atm                                 R = 0.08206 atm*L/mol*K

V = 4.2 L                                     T = 305 K

n = ? moles

PV = nRT

(2.7 atm)(4.2 L) = n(0.08206 atm*L/mol*K)(305 K)

11.34 = n(25.0283)

0.453 = n

By generating a rate law is complicated when the rate-determining step is preceded by 'a' is a Equilibrium reaction.

The rate law shows about the rate of chemical reaction depends on reactant concentration.

According to rate law, the rate of reaction is directly proportional to the concentration of reaction which is raised to a stiochiometric coefficient which is determined experimentally.

Thus, from above we concluded that if the preceding reaction is an equilibrium, that compromises the simplicity of writing the rate law from the stiochiometry of the rate determining step will be used up in the reverse reaction of the equilibrium.

learn more about rate law :

https://brainly.com/question/14779101

#SPJ4

The radius of a sodium atom is determined as 2.145 x 10⁻⁸ cm.

Body-centered cubic (BCC) is the name given to a type of atom arrangement found in nature.

A body-centered cubic unit cell structure consists of atoms arranged in a cube where each corner of the cube shares an atom and with one atom positioned at the center.

The volume of the sodium atom is calculated as follows;

V = ZM/Nρ

where;

V = (2 x 23) / (6.023 x 10²³ x 0.968)

V = 7.89 x 10⁻²³ cm³

a = (V)^¹/₃

a = (7.89 x 10⁻²³ cm³)^¹/₃

a = 4.29 x 10⁻⁸ cm

r = a/2

r = ( 4.29 x 10⁻⁸ cm) / 2

r = 2.145 x 10⁻⁸ cm

Thus, the radius of a sodium atom is determined as 2.145 x 10⁻⁸ cm.

Learn more about sodium atom here: https://brainly.com/question/25033306

#SPJ1

Na -k pumps couple atp hydrolysis with the transport of Na and k.

Both ions are used for active transport.

d. K+ and Na+ both diffuse into the cell along their concentration gradients and drive the transport of glucose.

Na/K pump is a pump located on the plasma membrane which uses ATP to move 3 Na ions out the cell and brings in 2 K ions into the cell. It is an example of primary active transport. As a consequence, concentration of Na is higher outside the cell, while K concentration is higher inside the cell.

Glucose is transported in the cell against its gradient, together with Na ions (symport) which move down their concentration gradient.

This is an example of secondary active transport because it uses the energy from the primary active transport to move other substances such as glucose against their own gradients.

Learn more about atp hydrolysis :https://brainly.com/question/13056741

#SPJ4

0.6 mol / L is the molarity of a solution prepared by dissolving 36. 0 g of NaOH in enough water to make 1. 50 l of solution.

The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another term for molarity.

The ratio employed to indicate the solution's concentration is called its molarity. Understanding a solution's molarity is important since it allows you to determine the actual concentration as well as whether the solution is diluted or concentrated.

Amount of NaOH = 36. 0 g

Amount of water = 1. 50 L

1 mol of NaOH = 40 g,

Moles of NaOH = 36. 0 / 40 g = 0.9 mol NaOH

Molarity of a solution = moles of solute / Liters of solution

Molarity of a solution = 0.9 / 1.50

Molarity of a solution = 0.6 mol / L

To  know more about Molarity refer to:  https://brainly.com/question/8732513

#SPJ4

The products created during nuclear fusion are Energy and Helium Gas

Overall, two positrons, two neutrinos (which convert two of the protons into neutrons), and energy are released along with the fusion of four protons into one alpha particle.

Nuclear fission is a nuclear reaction in which low energy neutrons are used to smash the nucleus of an atom into smaller nuclei. In this process, a large amount of energy is released. Nuclear fission reactions are employed in nuclear power reactors due to their simplicity and high energy output.

When two or more atoms come together to produce one heavier nucleus, the process is known as nuclear fusion. This process releases a tremendous quantity of energy, far more than the energy

Learn more about Nuclear fusion and fission here:

https://brainly.com/question/13859758

#SPJ4