30 ml of. 150 m cacl2 is added to a 15 ml of. 100 m agno3

Answer!

After 2 years, 1.986 g of a radioisotope material remains from a sample of the original mass of 2g, what is the half-life of the sample? - Radioactive decay occurs according to the formula:

A = A0 * exp(-ln(2) * t/T1/2)

The Original activity or mass A0 will decay to be A after time t where T1/2 is the decay time or half-life. If you fill in the values for A, A0 and t (= 2 years) you will end up with a value of approximately 188 years for the half-life.

Answer:B

Explanation:

The metal spoon is a better thermal conductor. Hence, option B is correct.

A thermal conductor is a material that allows the energy in the form of heat, to be transferred within the material, without any movement of the material itself.

Metals are good conductors. Laying on the metal handle of the metal cooking pot. It appears that the pot is sitting on top of a campfire.

Since metal is a good conductor of energy, the spoon gets hot because heat is transferred through the metal pot to its handle, and then to the metal spoon.

Hence, option B is correct.

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Hydrogen bonds are stronger than the dipole dipole attraction force present in any molecule.

Bonding is a type of attraction force which is present between the different atoms or elements of any substance.

Hence main difference is that hydrogen bond is only present between the hydrogen atom and more electronegative.

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The critical angle for the interface between water and diamond is 33.4 degrees.

The greatest angle at which a ray of light traveling through one transparent medium can hit the border between that medium and a second of lower refractive index.

It strikes the border without being completely reflected within the first medium is called the critical angle in optics.

Thus, the critical angle for the interface between water and diamond is 33.4 degrees.

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Looking at the density of the penny which is 7.1347 g/cm³, it can be concluded that it is not made from copper.

It is the ratio of the mass of a substance to its volume.

Mathematically; density = mass/volume

In this case, the mass of the coin is 2.49 g, and the volume is 0.349 cm³. Thus:

Density of coin = 2.49/0.349 = 7.1347 g/cm³

The density of copper is 8.96 g/cm³ at room temperature.

Hence, the penny is not made of copper.

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Entropy change is the randomness of the thermodynamic system. The change in the entropy when the water is condensed is 1573 J/K.

An entropy change is a product of mass and the ratio of the enthalpy of vaporization to the temperature.

Given,

Enthalpy of vapourization =  2257 J/gK

The temperature in kelvin = 373 k

The change in entropy is calculated as:

[tex]\begin{aligned} \rm \Delta S &= \rm m (\dfrac{\Delta H_{vap}}{T})\\\\&= 260 (\dfrac{2257}{373})\\\\&= 1573.24\;\rm J/K\end{aligned}[/tex]

Therefore, the change in entropy is 1574 J/K.

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4.9 moles of salt are required to be added to 1 kg water to change the boiling temperature

by 5°C.

Based on the given equation, the molality of the solution is calculated as follows:

Change in temperature = 5 °C

Kb = 0.51

i = 2

Molality = 5/0.51 × 2 = 4.9 molal

Also, Molality = moles/kg of water

Moles of salt = molality × kg of water

Moles of salt = 4.9 × 1 = 4.9 moles.

Therefore, 4.9 moles of salt are required to be added to 1 kg water to change the boiling temperature

by 5°C.

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The mass of potassium chloride with solubility 253.9 g/mL present in 100 grams of solution is 25.4 grams.

Concentration is given as the quantity of the solute present in the solution. The water at 25 degrees Celsius has density of 0.9982 g/mL.

The mass of the 100 grams of water is given as:

[tex]\rm Density=\dfrac{mass}{volume}\\\\0.9982\;g/mol=\dfrac{100\;grams}{Volume}\\\\Volume=100.180\;mL[/tex]

The solubility of potassium chloride is 253.9 g/mL

The grams of potassium chloride in the 100 grams solution will be:

[tex]\rm Mass\;of\;potassium\;chloride=\dfrac{253.9}{1000}\;\times\;100.81\;g\\\\Mass\;of\;potassium\;chloride=\25.4\;g[/tex]

Thus, the mass of potassium chloride present in 100 grams of water is 25.4 grams.

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From the calculations, the final temperature of the object is 26.1 °C.

The specific heat capacity is defined as the temperature that is required to raise 1 Kg of a substance through a temperature rise  of 1 K.

When;

H = 950.0 J

T1 =  24.20°C

m = 120.1 g

c = 4.184 J/g･°C

T2 = ?

H = mc(T2 - T1)

950 = 120.1  * 4.184(T2 -  24.2)

950 = 502.5T2 - 12160.5

950 + 12160.5 = 502.5T2

T2 = 950 + 12160.5/502.5

T2 =  26.1 °C

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The model of atoms undergoing nuclear fission will decrease in size while that of atoms undergoing nuclear fusion will increase in size.

Radioactive decay is a process in radioactivity in which the nucleus of atoms spontaneously breakdown or decay to produce smaller atomic nucleus with the emission of radiation.

Nuclear fusion involves the merging together of the nucleus of two or more smaller atoms to produce a larger atom whereas nuclear fission is the splitting of the nucleus of larger atoms into smaller atomic nuclei.

Therefore, the model of atoms undergoing nuclear fission will decrease in size while that of atoms undergoing nuclear fusion will increase in size.

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Answer:

This is for the table

Explanation:

Sorry for my handwriting

The enthalpy change for the reaction 2K + S + K2S using the following thermochemical reactions is mathematically given as

dn=70.7kg

Generally, the equation for the  Chemical reaction is mathematically given as

2k+s----->K2S

Therefore

KS+K----->K2S

Therefore

dn=dn1+dn2

dn=32.5+38.2

dn=70.7kg

In conclusion,  the enthalpy change is

dn=70.7kg

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Answer:

5.1622 mol This is the answer for your questions

Answer:

The light goes through

Explanation:

The light goes through the transparent glass without being reflected or absorbed, for example, a window is a transparent glass, you never see light being reflected off of a window

Hope this helps (:

Answer:

Base

Explanation:

Why is Alka-Seltzer a base?

Alka-Seltzer contains sodium bicarbonate and citric acid. The sodium citrate acts as an antacid. Excess sodium bicarbonate from the Alka-Seltzer acts to neutralize base.

= 87 : 29

= 3 half lives

The quantity which is equivalent to the product of the absolute index of refraction of water and the speed of light in water system is the speed of light in vacuum.

Speed of light is the rate of speed though the light travels. To find the speed of light in any medium, the following formula is used.

[tex]v=\dfrac{c}{n}[/tex]

Here, (n) is the index of reaction and (c) is the speed of light in the vacuum. The speed of light in the vacuum is almost equal to the 3.0×10⁸ m/s.

Now the quantity which is equivalent to the product of the absolute index of refraction of water and the speed of light in water has to be find out.

The above formula can be written as,

[tex]v=\dfrac{c}{n}\\vn=c\\c=vn[/tex]

Here, the product of index of refraction and speed of light is equal to the speed of light in vacuum. This will be true for water as well.

Thus, the quantity which is equivalent to the product of the absolute index of refraction of water and the speed of light in water system is the speed of light in vacuum.

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The concentration of the nitrate ion, NO₃¯ in the solution given the data is 0.0216 M

This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Mole = mass / molar mass

Mole of Al(NO₃)₃ = 0.6 / 213

Mole of Al(NO₃)₃ = 0.0028 mole

Molarity = mole / Volume

Molarity of Al(NO₃)₃ = 0.0028 / 0.39

Molarity of Al(NO₃)₃ = 0.0072 M

Dissociation equation

Al(NO₃)₃(aq) <=> Al³⁺(aq) + 3NO₃¯(aq)

From the balanced equation above,

1 mole of Al(NO₃)₃ contains 3 moles of NO₃¯

Therefore,

0.0072 M Al(NO₃)₃ will contain = 0.0072 × 3 = 0.0216 M NO₃¯

Thus, the molarity of NO₃¯ in the solution is 0.0216 M

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Answer:

2.256 moles of oxygen atoms

Explanation:

CaCo3  is calcium carbonate

  every mole of calc carb has 3 moles of O atoms

  .752 moles of this has 3 times as many moles of Oxygen atoms

According to the mole concept , there are 2.256 moles of oxygen in 0.752 moles of calcium carbonate.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

As 1 mole of calcium carbonate has 3 moles of oxygen ,

∴ in 0.752 moles of calcium carbonate there are 0.752×3=2.256 moles.

Thus,there are 2.256 moles of oxygen in 0.752 moles of calcium carbonate.

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The amount of sample of Plutonium-32 which is remained after 99.4 days is 3.9 grams.

Remaining amount of any substance after the decay will be calculated by using the below equation:

N = N₀[tex](\frac{1}{2})^{\frac{T}{t}}[/tex], where

N = remained quantity = ?

N₀ = original quantity = 499.2g

T = total time = 99.4 days

t = half life time = 14.2 days

T/t = 99.4/14.2 = 7

On putting all these values in the above equation, we get

N = (499.2)(0.5)⁷

N = (499.2)(0.0078) = 3.9g

Hence remaining mass of Plutonium-32 is 3.9 g.

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The total question is not found here but the onion structures that we can see with 30 X are the cell wall and an important vacuole.

The 30X magnification does not exist, nowadays the current objective lens comes in 20X, and 40X.

Using this magnification, we might see plant cells that divide to produce  cell walls between daughter cells after a process called mitosis.

In conclusion, the total question is not found here but the onion structures that we can see with 30 X are the cell wall and an important vacuole.

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Answer: 167.2 J

Explanation:

Answer:

It comes from the sun.

Answer:

A.3.011 x 10^24 atoms CO²

[tex] \overline{ \quad \quad \quad \quad\quad\quad\quad\quad\quad}[/tex]

hope it helps!

Each photon will give one electron, thereby the number of photons given each second are [tex]4.46\;\times\;10^{15}[/tex]. The power carried by the electrons is 0.255 mW.

A laser is a light-emitting device that enables the process of optical amplification to deduce electromagnetic radiations.

The given laser has a power output of 2.15 mW and a wavelength is 413 nm.

The energy of each photon emitted is given as:

[tex]E=h\nu=\dfrac{hc}{\lambda}=\rm \dfrac{(6.63 \;\times\; 10^{-34} m^2 kg s^{-1}) \;\times (3.0 \;\times\; 10^8 m s^{-1})}{413 \;\times\; 10^{-9} m}=4.81 \;\times\;10^{-19}[/tex]

The number of photons ejected at 2.15 mW is given as:

[tex]\rm \dfrac{2.15\;\times\;10^-^3\; J}{4.81\;\times\;10^-^1^9J}=4.46\;\times\;10^1^5 \;photons[/tex]

Each photon will give one electron, thereby the number of photons given each second are [tex]4.46\;\times\;10^{15}[/tex].

With the work function of 2.71 eV, the power carried by the electrons is given as:

[tex]KE_{e}=h\nu-\Phi=\rm 4.81\;\times\;10^{-19} J - 2.71 eV\;\times\; \dfrac{1.60 \;\times 10^{-19} J}{1 eV}=6.34 \;\times 10^{-20}[/tex]

The power carried by all the electrons ejected is given as:

[tex]P_{e}=\rm (4.02\;\times\;10^1^5 s^{-1}) \;\times\; (6.34 \;\times\; 10^{-20} J)=0.255 \;mW[/tex]

The power carried by the electrons is 0.255 mW.

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Answer: 1.0 M

Explanation:

250 mL = 0.25 L

molarity = (moles of solute)/(liters of solution) = 0.25/0.25 = 1.0 M

Rules for naming ionic compounds with transition metal requires the elementary name of metal followed the anion name with suffix ide.

Ionic compounds are made up of ions, which are charged particles that occur when an atom (or group of atoms) acquires or loses electrons. Generally cations are metals and anions are non metals in it.

Following rules will be considered during naming:

Hence rules for naming are listed above.

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Answer:

yes you are doing it right my chemistry teacher said said so