Assume a parent isotope has a half-life of 100 million years. How old is a sample that
contains 15% of its original parent isotope?
250 million years
270 million years
200 million years
100 million year

Answer:

See Explanation

Explanation:

Because you have to get through the d-block electron configurations for the rest of the p-block elements which is a hassle to do. You need to know how to account for electron stability, from which subshell to remove electrons, etc. because it is all weird for d-block.

The formula for an isotope of oxygen with nine neutrons, including the mass number and the atomic number is 17/8 O.

Isotope is any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.

This means that atoms of isotopes will have the same atomic number but a different mass number.

According to this question, an isotope of oxygen has 9 neutrons. If oxygen has an atomic number of 8, the formula of this particular isotope is as follows: 17/8 O.

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Answer:

The molecules of the substance move further apart which pulls on the intermolecular bonds between them

Explanation:

because it said it was right

Answer:
857.2947

Explanation:

You start with what you’re given 82g of H20 and multiply by 1 mole and the actual grams of h20 which is 18.0 then you do the mole. 1 mol of O2 and 2 mol of H2O times 6.02 x 10^23

Answer:

Hydrogen Gas is the free element

Answer: 0.463 mol (to 3 sf)

Explanation:

So, the mass of water is 2(1.00794)+15.9994 = 18.01528 g/mol.

This means that in 8.35 grams of water, there are:

Based on the observations from, the substance that water is more attracted to are polar substances.

Water is a compound made up of 2 atoms of hydrogen and 1 atom of oxygen.

Water molecule is polar due to the unequal sharing of electrons between the atoms and the unsymmetrical shape of the molecule.

Since water molecules are polar, they are more attracted to molecules that are also polar.

Thus, based on the observations from, the substance that water is more attracted to are polar substances.

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The solution is the mixture of the solute into the solvent particles. In 60 mL solution, 59.8 mL of solvent is added.

Solute and solvent are the components of a solution. They react and mix together to produce a homogenous mixture. The solute is a substance that is added to the solvent.

Solvents are substances that dissolve the added solute in them to make a homogenous solution.

Given,

Volume of Solute = 0.20 mL

Volume of Solution = 60 mL

The volume of solvent is calculated as:

Volume of solvent = Volume of solution - Volume of solute

= 60- 0.20

= 59.8 mL.

Therefore, 59.8 mL of solvent is present in 60 mL of solution.

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Answer:

65 ml

Explanation:

The aluminum will not float , so it will displace a volume of fluid equal to its volume.

 13.5 gm / 2.7 gm/ml = 5 ml

the new graduated cylinder measurement will be 60 + 5 = 65 ml

Answer:

Highest wavelength : radio waves

So lowest energy: radio waves

Hence order is:

radio waves < microwaves < IR waves < visible light < ultraviolet radiation < X-rays < gamma rays

The equation for this reaction is

[tex]\text{Mg}+\text{O} \longrightarrow \text{MgO}[/tex]

This means that for every mole of magnesium consumed, 1 mole of magnesium oxide is produced.

So, the answer is 0.094 moles.

Answer:

2.00 M

Explanation:

The formula mass of aluminum oxide is 2(27)+3(16)=102 g/mol.

So, there is 1 mole of solute in 500 mL=0.5 L of solution

Now, we can use the equation molarity = (moles of solute)/(liters of solution)

We can see from the details below that, the value of the solution's molality is 1.14 mol/Kg.

The term solubility has to do with the quantity of solute that is able to dissolve in a given quantity of solvent. We have the solubility of the sodium hydrogen carbonate in water at 20 degrees as 9.6 g/100 g h2o.

Number of moles of sodium hydrogen carbonate = 9.6 g/84 g/mol = 0.114 moles

Number of moles water = 100 g /18 g/mol = 5.55 moles

Mole fraction of sodium hydrogen carbonate is obtainable by the use of the relation;

0.114 moles/0.114 moles + 5.55 moles

= 0.02

Molality of the solution = 0.114 moles/0.1 Kg = 1.14 mol/Kg

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The purpose of cracking in the production of ethene is to convert large molecules into small molecules.

Ethene can be produced from the thermal cracking of ethane and propene.

In thermal cracking, high temperature of about 750-850°C and pressure of up to about 70 atm is used to break carbon-carbon bonds. Free radicals are formed in the process.

More about petroleum refining processes:

Petroleum refinery can be classified into two broad categories, namely the main refining processes and conversion processes. Main refining processes includes distillation, absorption and adsorption, while conversion processes involves thermal cracking, catalytic cracking and hydrocracking.

As the name implies, cracking is generally the breaking up of larger molecules into smaller, more useful molecules, such as those with 5 to 12 carbons.

To better comprehend cracking processes, we can use the analogy of dropping a ceramic mug.

When this ceramic mug is dropped, it breaks into smaller ceramic pieces. This represents smaller molecules being formed from a larger molecule. The force used to break them into smaller molecules would differ in the various types of cracking processes. For example, thermal cracking mainly uses heat while catalytic cracking mainly uses a zeolite catalyst.

Note that for these cracking processes to occur, there are other conditions involved.

Additional:

To learn more about cracking, do check out the following!

the answer is Ethane

hope it helps...!!!

the answer is Ethane

hope it helps...!!!

Answer:

[tex]\huge\bold\color{pink}{- Magdonal -}[/tex]

[tex]\huge\red{\overline{\qquad\qquad\qquad\qquad}}[/tex]

[tex]\pink{\rule{1pt}{999999pt}}[/tex]

Answer:

.025 moles

Explanation:

Be Cl2   is beryllium chloride

Be = 9.0121 gm/mole

Cl = 35.45 gm mole

   Be Cl2 = 79.91 gm/mole

2 gm / 79.91 gm/mole = .025 moles

The energy of the photon from the calculation performed is 3.5 * 10^-16 J.

A photon is a packet of light. It was derived from the theory of Albert Einstein. The energy of a photon is obtained from; E = hc/λ

Now we have that;

E = 6.6 * 10^-34 * 3 * 10^8/562 * 10^-9

E = 3.5 * 10^-16 J

Missing parts:

Calculate the energy, in joules, of a photon of green light having a wavelength of 562nm?

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The chemical equation for the reaction between carbon oxide and nitrogen oxide is shown below:

[tex]CO + NO \rightarrow CO_2 + N_2[/tex]

A chemical equation is an equation which uses the symbols of elements and compounds to represent the reactions which occur between elements or compounds to form products.

The chemical symbol for carbon is C, nitrogen is N, and oxygen is O.

The equation representing the reaction between carbon oxide and nitrogen oxide is shown below:

[tex]CO + NO \rightarrow CO_2 + N_2[/tex]

Therefore, the chemical equation for the reaction between carbon oxide and nitrogen oxide represents the reaction to form carbon dioxide and nitrogen gas.

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Answer:

Explanation:

You would have to add up the atomic masses of all the compounds in the compound, making sure you include how many molecules of each are in the compound

For example, in CuSOA we have 1 molecule of Cu and S, as 4 molecules of O

The atomic masses are as follows:

Cu = 63.55 u

S = 32.065 u

O = 15.99 units

This is how we would add it up:

(Atomic mass of Cu) + (Atomic mass of S) + 4(Atomic Mass of O)

(63.55) + (32.065) + 4(15.99)

(63.55) + (32.065) + 63.96

= 159.575 u

Answer:

I don't no this answer do you know then telle

Answer: Environmental chemistry

Explanation:

3.00097 x [tex]10^{23}[/tex] atoms are contained in 100.0 g of mercury.

The mole is defined as the amount of substance that contains as many elementary entities as there are atoms in exactly 12 g of carbon-12.”

Number of moles of mercury = [tex]\frac{mass}{molar \;mass}[/tex]

Number of moles of mercury = [tex]\frac{100.0 g}{200.59 u}[/tex]

=  0.4985 moles

Number of moles of mercury = Number of atoms = moles of Hg x [tex]6.02 X 10^{23}[/tex]

= 0.4985 x [tex]6.02 X 10^{23}[/tex]

= 3.00097 x [tex]10^{23}[/tex] atoms.

Hence, 3.00097 x [tex]10^{23}[/tex] atoms are contained in 100.0 g of mercury.

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Lithium is used to build computer batteries, whereas iron is used in industry to construct buildings and bridges.

In engineering, metals are characterized to have electrical conductivity and other properties (e.g., ductility, reflectivity, etc).

For example, Lithium can be defined as soft metal (alkali metal) that is suitable to store electrical energy.

In conclusion, Lithium is used to build computer batteries, whereas iron is used in industry to construct buildings and bridges.

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Answer:

the molecules move more quickly and their average kinetic energy decreases :D

Explanation:

Answer:1# reactants 2#coefficient

Explanation:

A phenotypic characteristic and/or trait of the cats that exhibit variation is the fur color.

Phenotypic variation is any type of distinguishable value for a trait that depends on genetic and/or environmental factors.

Cats exhibit different fur colors depending on specific gene variants (alleles) that are inherited from their parents.

In conclusion, a phenotypic characteristic or trait of the cats that show a variation is the fur color.

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The titration would require the same amount of NaOH.

The number of moles of solute in a solution remains the same irrespective of the amount of water added to dilute the solution.

This is in accordance with the dilution law which says that the number of moles of a solution before dilution is the same as after dilution.

Thus, the amount of NaOH needed to neutralize the vinegar will remain the same for a complete reaction since the number of moles of solute in the vinegar has not changed.

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Answer: 0.02 M

Explanation:

[tex]M_{A}V_{A}=M_{B}V_{B}\\(23)(0.0150)=(18)M_{B}\\M_{B}=\frac{(23(0.0150)}{18} \approx \boxed{0.02 \text{ M}}[/tex]