A rock contains uranium 238 which has a half life of 4.5 billion years. if the rock is crushed and heated, the half life in urainium-238 will

Answers

Answer 1

The answer is remain the same.If the rock is cut, crushed, or heated, the length of the half life of the uranium would remain the same since these factors have no effect on half-life.Even though chemical changes were affected by temperature, the physical state, pressure, concentration, the chemical environment within the molecule, and any other changing factors, the half-life of a radioactive substance is independent of these influences.

Answer 2

Crushing and heating a rock containing uranium-238 does not change its half-life, which remains 4.5 billion years.

The half-life of a radioactive isotope like uranium-238 is the time it takes for half of its atoms to decay into another element.

For uranium-238, this duration is 4.5 billion years.If a rock containing uranium-238 is crushed and heated, the half-life of the uranium-238 will remain the same.This is because the half-life is a fundamental property of the radioactive nucleus and is not affected by external conditions like crushing or heating.

To summarize, the process of crushing and heating the rock does not alter the radioactive decay process or the half-life of uranium-238, which will remain constant at 4.5 billion years.

Related Questions

If 25.0 ml of seawater has a mass of 25.895 g and contains 1.295 g of solute, what is the mass/mass percent concentration of solute in the seawater sample? 5.18% 5.001% 3.862% 96.5% 20.00%

Answers

The % mass/mass concentration of solute in the seawater sample is calculated as below

% mass = mass of the solute /mass of the solvent(sea water) x100
mass of the solute =1.295 g
mass of the solvent(sea water_) = 25.895 g

there the % mass = 1.295/25.895 x100 = 5.001 %

1. What is the pH of a 0.085 M solution of nitrous acid (HNO2) that has a Ka of 4.5 × 10-4?

2.21

5.33

3.35

4.42

Answers

The chemical reaction for nitrous acid in a solution with water is
                 HNO2 + H2O(l) ⇄ H3O^+ + NO2^-
Then
                 Ka = [H3O^+][NO2^-] / [HNO2]
If we let x represent the concentrations of [H3O^+] and [NO2^-] then
                 Ka = x^2 / [HNO2]
                    x = √(Ka * [HNO2])
                    x = √(4.5 × 10^-4 * 0.085)
                    x = 6.1846 x 10^-3 = [H3O+]
Therefore
                  pH = -log[H3O+]
                  pH = -log[6.1846 x 10^-3]
                  pH = 2.21
The answer to your question is 2.21.

what is the molarity of a 650. mL solution containing 64 grams of NaCl?

Answers

Molarity (M) is defined as moles of solute per liter of solution. So, find the moles; find the liters, and divide to get M.
moles of NaCl = 64g x 1 mole/58.4 g = 1.095 moles NaCl
liters of solution = 650.0 ml x 1 L/1000 ml = 0.6500 liters
Molarity (M) of NaCl = moles/liters = 1.095 moles/0.6500 liters = 1.68 molar = 1.7 M (to 2 significant figures)

Question 6 if a gas pressure gauge reads 32.0 psi, what is the pressure in inches of mercury? 165 in. hg 15.7 in. hg 65.1 in. hg 32.0 in. hg 6.19 in. hg

Answers

psi and in.Hg are both units used to measure pressure.
psi stands for pounds per square inch and in.Hg stands for inches in mercury.
1 psi is equivalent to 2.036 in.Hg
therefore 32.0 psi is equivalent to 2.036 in.Hg /psi x 32.0 psi = 65.1 in.Hg
therefore answer is 65.1 in. Hg

Answer:

65.1

Explanation:

What's the definition of ions

Answers

an atom or molecule with a net electric charge due to the loss or gain of one or more electrons. :)

molecule or atom with net charge due to gain or loss of one or more electrons

Which equation represents the half-reaction that takes place at the fork?

Answers

The fork is negative electrode and so the Cathode. Reduction is the process takes place at the cathode. Silver ions are attached to the negative electrode (fork) and combines with electron to form metallic silver which is the fork contains.
So the equation will be:
Ag + (aq) + e ---------> Ag(s)

Which of the following energy yields is most likely to have come from a fission or a fusion reaction?

Answers

The correct option is D.
Fusion and fission reactions involve the generation of energy either by the coming together of atomic nuclei or by splitting apart of atomic nuclei. The amount of energy that is generated during fusion and fission process is very high and is in the range of kiloelectron volts (10^3 eV), megaelectron volts (10^6 eV) and gigaelectron volts (10^9 eV) per atom or particle.

Answer:

D. 2.0 x 10^11 kJ/mol

Got it correct on my quiz!

1. Versions of atoms with different amounts of neutrons are called ________.

Answers

Atoms with different amounts of neutrons while having the same number of protons are known as isotopes. Some isotopes can be stable and others radioactive; for example, Carbon-12 is a very common and stable element, but it’s sister isotope C-14 is a radioisotope with a half life of 5,280 years (carbon dating).

What number of moles of solute are present in 25.0 mL of 2.00 M HCl?

Answers

Molarity is defined as the number of moles of solute in 1 L of solution
molarity of given HCl solution is 2.00 M
this means that there are 2.00 mol of HCl solute in 1 L solution
so if 1000 mL contains - 2.00 mol
then 25.0 mL contains - 2.00 mol / 1000 mL/L x 25.0 mL = 0.0500 mol
number of moles of solute are 0.0500 mol

The number of moles of solute that are present in 25.0 mL of 2.00 M HCl is equal to 0.05 moles.

How do we calculate moles from molarity?

Molarity (M) of any solution is define as the number of moles (n) of solute present in per liter of the solution (V) and represented as:

M = n/V

Given that, Volume of solution = 25mL = 0.025L

Molarity of HCl = 2M

Moles = (2)(0.025) = 0.05 moles

Hence required moles of solute are 0.05 moles.

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Describe two negative effects that water pollution can have on the environment. Explain one way water pollution can be reduced.

Answers

water pollution affects the fish, and then we eat the fish so the fish affects us. im not sure about the first part.Do not dispose of household cleaning down the toilet.

Answer:

1) Adverse effect on aquatic life also increase in biological oxygen demand.

2) Biomagnification of pollutants

Explanation:

Water pollution is caused by unwanted addition of waste, animal debris, industrial effluents etc in a water body.

Water pollution may cause many direct and indirect harmful effects on environment. To name a few:

a) Decrease in level of oxygen leading to death of aquatic organism like fish.

Increase in biological oxygen demand.

b) Biomagnification: a pollutant may enter food chain from water and some pollutant may enter food chain contaminating other members of food chain.

Why can 6-aminohexanoic acid undergo a polymerization reaction with itself?

Answers

The amino group on one molecule can react with the carboxyl group on another molecule.

Answer: Functional groups can lead to intra molecular condensation.

Explanation: 6 -aminohexanoic acid is a molecule which have 2 functional groups - one is amine group (-NH2) and the other one is carboxylic group (-COOH).

The non bonding electrons or lone pairs present on the amine group being nucleophillic in nature will attack on the electrophillic carbon of carboxylic group to form the amide bond, the structure of which is hereby attached.

Thus due to the presence of 2 active functional groups, polymerization with itself can take place easily.

Which of the following is an example of chemical weathering? a. waves washing over rocks on the beach b. acid rain falling on sidewalks c. ice forming in the cracks of rocks d. wind blowing against rocks

Answers

B. acid rain falling on sidewalks

Answer:

b. Acid rain falling on sidewalks

Explanation:

Hello,

Acid rain contains majorly carbonic acid [tex]H_2CO_3[/tex] which could react with the concrete that is used to make sidewalks. This chemical reaction, although varies based on the concrete's composition, usually gives off carbon dioxide owing to the acid's instability and leads to the weathering since the sidewalks start to wear out and subsequently break down.

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What kind of reaction occurs when the entropy change of an endothermic reaction is negative?

Answers

Answer is: reaction is nonspontaneous under standard conditions at all temperatures.

Gibbs free energy (G) determines if reaction will proceed spontaneously.
ΔG = ΔH - T·ΔS.
ΔG - changes in Gibbs free energy.
ΔH - changes in enthalpy.
ΔS - changes in entropy.
T is temperature in Kelvins.
When ΔS < 0 (negative entropy change) and ΔH > 0 (endothermic reaction), the process is never spontaneous (ΔG> 0).

Answer:

reaction is nonspontaneous under standard conditions at all temperatures.

Explanation:

took the test.

N2 (g) + 3H2 (g) -->2 NH3 (g) The equation above is the equation for the Haber process. In a certain reaction, you start with 3.0 moles of nitrogen and 5.0 moles of hydrogen, How much of the excess reactant will be left over after the reaction?

Answers

This is a type of question that tests your ability to find the limiting reagent, or the component that first runs out in the reaction and limits the continuation of the reaction.

To start, begin by figuring out how many times each component can run the reaction. It takes three moles of H2 to run the reaction “once”, so with five moles of H2, you can run it 1.66 times.

It takes one mole of N2 to run the reaction “once”, so with three moles of N2, you can run it three times. This means that H2 is the limiting reagent (1.66 < 3), and N2 will have excess.

After the reaction is run to completion (1.66 times), 1.33 moles of N2 will remain (1.33 left + 1.66 used = 3, beginning).

Final answer:

H₂ is in excess and N₂ will be completely consumed in the reaction.

Explanation:

According to the balanced equation, 1 mole of N₂ reacts with 3 moles of H₂ to produce 2 moles of NH₃. In this particular reaction, you have 3.0 moles of N₂ and 5.0 moles of H₂. To determine the limiting reactant, you need to compare the moles of each reactant to the stoichiometric ratio. In this case, the ratio of moles of N₂ to H₂ is 1:3. Since you have more moles of H₂ (5.0) compared to the stoichiometric ratio, H₂ is in excess. Therefore, all of the N₂ will be completely consumed and there will be no N₂ left over after the reaction.

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2. Which of the following statements are true about a strong base and a weak base at a pH of 11?

HCl will not bring the pH of either solution to pH 7.

Both bases require the same amount of HCl to reach pH 7 because they are both
at the same initial pH.

The weak base will require less HCl to bring the pH to 7 than the strong base. The strong base will require less HCl to bring the pH to 7 than the weak base.

Answers

The answer is "The weak base will require less HCl to bring the pH to 7 than the strong base." Using titration curves, both bases will require the same amount of HCl to reach equivalence point but they will have different pH values. A strong acid like HCl will react with a strong base to form a solution with pH equal to 7 while HCl will react with a weak base to form a solution with pH less than 7. Hence, the weak base will require lesser HCl to bring the pH to 7.

the answer is definatly A

Why are valence electrons important? Why do elements bond? What are two ways elements complete their valence?

Answers

Why are valence electrons important?

Valence electrons are the electrons present farthest from nucleus. These valence electrons are either transferred or shared during a reaction. Some elements like metals donate valence electrons in ionic compound formation, while some like Carbon mutually share thier valence electrons to make a covalent bond. Hence, it is the valence electrons that make any element reactive or unreactive.

Why do elements bond?

Elements react in order to gain stability. This stability is gained in the form of attaining noble gas configuration either by donating, gaining or mutually sharing their valence electrons.

What are two ways elements complete their valence?

The two ways are transfer of electrons and mutual sharing of electrons.

Example:
Sodium looses one valence electron to obtain Noble gas configuration of Neon which is more stable configuration.
Chlorine gains one electrons to obtain Noble Gas configuration of Argon which is more stable configuration.
Carbon mutually shares its four valence electrons with four atoms of Hydrogen having one electron per atom to complete its octet.

A sample of oxygen gas has a volume of 150. milliliters at 300 k. if the pressure of the sample is held constant and the temperature is raised to 600 k, the new volume of the sample will be

Answers

The volume will be 300 ml

Answer:

The new volume of the sample will be 300 milliliteres

Explanation:

We were given the following;

Initial Volume (V1) = 150ml

Initial Temperature (T1) = 300K

Final Temperature (T2) = 600K

Final Volume (V2) = ?

Pressure is held constant.

The law applicable in solving this question is that of Charle's law. This law states that the volume of a fixed mass of gas varies proportional to the temperature at constant pressure.

The formula is given as;

[tex]\frac{V1 }{T1} = \frac{V2 }{T2}[/tex]

Solving for V2. we have;

[tex]V2 = \frac{V1T2}{T1}[/tex]

V2 = ( 150 * 600) / 300

V2 = 300 ml

What is the ph of an acetic acid solution if 10 drops are titrated with 70 drops of a 0.65 m koh solution? (ka for acetic acid = 1.8 x 10-5)?

Answers

What is the ph of an acetic acid solution if 10 drops are titrated with 70 drops of a 0.65 m koh solution? (ka for acetic acid = 1.8 x 10-5)?

[KOH] = 0.65 M
[OH] = 0.65 M
Dilute your mom
[OH]Dil= 0.65 M * 70/80 = 0.56875 M

pH = 5.4

How many moles of KNO3 are needed to make 600 ml of a 1.3M solution?

Answers

Final answer:

To make a 1.3M solution with a volume of 600 ml, you would need 0.78 moles of KNO3.

Explanation:

To calculate the number of moles of KNO3 needed to make a 1.3M solution, we can use the equation:

Molarity (M) = moles of solute / liters of solution

Rearranging the equation, we can solve for moles of solute:

Moles of solute = Molarity x liters of solution

In this case, the molarity is 1.3M and the volume is 600 ml (which is equivalent to 0.6 L). Substituting these values into the equation:

Moles of KNO3 = 1.3M x 0.6 L = 0.78 moles

In the formation of a solution how does the solvent differ from the solute

Answers

Solute is a substance that dissolves in a solvent in order to form a solution. Solutes can be in liquid, gaseous or solid phase. Normally, in a solution, solutes are in a lesser amount than the solvents. When a solution has the maximum amount of solutes it can dissolve, then the solution is said to be saturated.

Which nuclear emission has the greatest penetrating power?
b. beta particle
a. proton
c. gamma radiation
d. positron

Answers

Answer:gamma radiation

Explanation:

Final answer:

Among the nuclear emissions including proton, beta particle, positron and gamma radiation, gamma radiation has the greatest penetrating power. It needs dense materials like lead or concrete to be shielded.

Explanation:

Of the nuclear emissions listed: a. proton, b. beta particle, c. gamma radiation, and d. positron, the one with the greatest penetrating power is c. gamma radiation. Unlike other particles, gamma radiation is a type of electromagnetic radiation, similar to X-rays. This means it is not a charged particle, allowing it to penetrate materials more easily.

For instance, alpha and beta particles would be blocked by a piece of paper or the surface of the human skin, but gamma rays can penetrate much deeper, requiring dense materials like lead or concrete for shielding.

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Why do covalent compounds tend to have lower melting points than ionic compounds?

Answers

Simple molecular substances consist of molecules in which the atoms are joined by strong covalent bonds. Their molecules are held together by weak forces, so these substances have low melting and boiling points. ... They have high melting and boiling points.

The forces of attraction in covalent compounds are weaker than those in ionic compounds as they are formed by sharing of electrons.

What are covalent compounds?

Covalent compound is defined as a compound which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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If the volume occupied by 0.500 mol of nitrogen gas at 0°C is 11.2 L, then the volume occupied by 2.00 mol of nitrogen gas at the same temperature and pressure will be:

A. the data given is not sufficient to determine the volume
B. 22.4 L
C. 44.8 L
D. the same as that occupied by 0.500 mol of nitrogen gas

Answers

Avagadros law states that volume of gas is directly proportional to number of moles of gas at constant pressure and temperature.
[tex] \frac{V1}{n1} = \frac{V2}{n2} [/tex]
where V -volume , n - number of moles
parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
substituting these values in the equation
[tex] \frac{11.2 L}{0.500 mol} = \frac{V}{2.00 mol} [/tex]
V = 44.8 L
answer is C. 44.8 L

A ping pong ball with a dent in it can be put into a pan of boiling water. After a short amount of time, the dent will pop out. Explain why this occurs.

Answers

thermal expansion causes the gas particles inside the ping pong ball to spread apart, putting pressure on the dent and popping back out.

Answer:

The right option is; b. the water caused an increase in temperature of the air inside the ball and an increase in pressure.

The dent (hollow area formed by pressing or hitting) from the ping-pong ball disappeared because energy was transferred from the hot boiling water in which the ball was placed to the air inside the ball. This transferred energy will increase the temperature of the air inside the ball and the air molecules will begin to move faster with a greater force. Hence, causing an increase in pressure.

Explanation:

The pair of elements that forms a bond with the least ionic character is

A. Na and Cl
B. K and Cl
C. O and Cl
D. Mg and Cl

Answers

As we know the electronegativity difference between two atoms in ionic compounds is greater than 1.7. So, greater the difference in electronegativity above 1.7 greater will be the ionic character and vice versa.

For Na and Cl;

E.N of Chlorine = 3.16

E.N of Sodium = 0.93
------------
Difference 2.23

For K and Cl;

  E.N of Chlorine = 3.16

  E.N of Potassium = 0.82
------------
  Difference   2.34

For O and Cl;

  E.N of Oxygen    = 3.44

  E.N of Chlorine = 3.16
  ------------
  Difference   0.28

For Mg and Cl;

  E.N of Chlorine = 3.16

  E.N of Magnesium = 0.93
------------
  Difference 1.31

Result:
As calculated above,the least electronegativity difference is found between Oxygen and Chlorine which is less than 1.7. Hence, it is not ionic compound or it has least Ionic character.

The pair of O and Cl elements forms a bond with the least ionic character.

The ionic character of the bond depends on the electronegativity difference. The bonds having an electronegativity difference of greater than 1.7 have more ionic character.

(A) In bond between Na and Cl, the electronegativity difference =

Electronegativity of Cl - electronegativity of Na

= 3.16 - 0.93

= 2.23

(B) In bond between K and Cl

= electronegativity of Cl - electronegativity of K

= 3.16 - 0.82

= 2.34

(C) In bond between O and Cl:

= electronegativity of O - electronegativity of Cl

= 3.44 - 3.16

= 0.17

(D) In bond between Mg and Cl:

= electronegativity of Cl - electronegativity of Mg

= 3.16 - 1.31

= 1.85

Since the bond between O and Cl has the least electronegativity difference, thus have the least ionic character.

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The formula for the illegal drug cocaine is c17h21no4 (303.39 g/mol). what is the percentage of hydrogen in the compound? 21.09% 4.618% 67.30% 6.991% 3.959%

Answers

molar mass is the sum of the products of molar masses of individual elements by the number of atoms of the element in the compound.
molar mass of H - 1.01 g
number of H atoms - 21 H atoms
therefore mass of H in 1 mol of compound - 1.01 g x 21 = 21.21 g
the molar mass of the compound - 303.39 g/mol
H composition percentage = [tex] \frac{mass of H in 1 mol}{molar mass of compound} *100%[/tex]
composition percentage = 21.21 g/mol /303.39 g/mol x 100%
H composition percentage = 6.991 %

therefore answer is 6.99 %

An enzyme is a protein that acts as a catalyst in a chemical reaction that takes place in a living thing true or false

Answers

An enzyme is a protein that acts as a catalyst in a chemical reaction that takes place in a living thing. It is true.

As the moisture-rich air approaches the mountain, it rises and cools, and water molecules in the air combine to form small drops. the process where water vapor becomes a liquid is called ____________

Answers

As the moisture-rich air approaches the mountain, it rises and cools, and water molecules in the air combine to form small drops. The process where water vapor becomes a liquid is called condensation.

Sedimentary rocks formed from the remains of once-living things are

Answers

The correct option is D. This type of rock is called biologic sedimentary rock. It is formed from accumulation of dead living things which have been compressed and cemented together to form a rock.

Please advise if this is your complete question entirely? If yes, then your correct answer is provided above.

Sedimentary rocks formed from the remains of once-living things are ____.
a. metamorphic
c. organic
b. detrital
d. none of the above

The correct option is D. This type of rock is called biologic sedimentary rock. It is formed from accumulation of dead living things which have been compressed and cemented together to form a rock.

Please advise if this is your complete question entirely? If yes, then your correct answer is provided above.

Sedimentary rocks formed from the remains of once-living things are ____.

a. metamorphic

c. organic

b. detrital

d. none of the above

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Write out the balanced equation for the reaction that occurs when Mg(OH)2 and HCl react together.

Answers

Mg(OH)2 + HCl —> H2O + MgCl2

Answer:

The balanced equation for the reaction that occurs when Mg(OH)2 and HCl react together is:

Mg(OH)2+2HCl -------->MgCl2+2H20

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