This problem is providing us with the rate constant and initial mass for radon's decay. Thus, several questions regarding how much it is left over after specific times are proposed and solved along this.
Radioactive decayIn chemistry, radioactive decay is a process whereby an unstable atomic nucleus loses energy by radiation, and therefore its mass decreases as the time goes by.
In such a way, one can use the following equation for the required questions:
[tex]A=Ao*exp(-t*k)[/tex]
Where A is how much is left over, Ao the initial amount, t the elapsed time and k the rate constant. Thus, we can proceed as follows:
(a) we just plug in the 2.96 days:
[tex]A=8.64g*exp(-2.96day*0.175day^{-1})\\\\A=5.15g[/tex]
(b) we need to convert 46.4 hours to days:
[tex]A=8.64g*exp(-46.4hr*\frac{1day}{24hr} *0.175day^{-1})\\\\A=6.16g[/tex]
(c) we assume this is a first-order reaction so we use its definition of half-life as:
[tex]t_{1/2}=\frac{ln(2)}{k} =\frac{ln(2)}{0.175day^{-1}}=3.96day[/tex]
(d) if five half-lives have taken place, the radon which is left over turns out to be:
[tex]A=8.64g*(\frac{1}{2} )^5\\\\A=0.270g[/tex]
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a molecule is the ___________particle of a substance that can normally exist independenty
Answer:
a molecule is the smallest particle of a substance that can normally exist independenty
Chemistry mixes 108 g of O2, with 232 L of C3Hg at STP. How many grams of H2O will be produced? The balanced equation for this reaction is:
CH, +5 02 + 3 CO2 + 4H2O
Is SiO2 London Dispersion, Dipole-Dipole, or Hydrogen Bonding?
Answer: SiO2 has more electrons and stronger London dispersion forces.
SiO2 is non-polar and has covalent bonds.A cat goes to the vet and weighs 8.92 pounds. How many grams does this represent? (1 pound = 454 grams) _________ g
Give your answer in scientific notation
Answer:
4049.68 or 3632
Explanation:
454x8.92=4049.68 but if thats incorrect then its 3632 cause it says 1 pound=454 grams so 8x454=3632.
what is going on in this world?
Biden and this virus is what’s going on
If 1200 J of energy is lost by a metal nail as it cools in a bucket of water, how much energy is gained by the water?
Heat lost (metal)=Heat gained (water)
Q in = Q out
So energy gained by the water = 1200 J
1) Kinetic energy is the energy an object has due to its
Position
Weight
Mass
Gravity
Motion
Answer:
the answer to the answer above is motion
i need to know this people
Answer:
2Al+ 6HCl -->2AlCl3 + 3H2
2NaCl --> 2Na + 1Cl2
1Na2S + 2HCl --> 2NaCl + 1H2S
CH4 + 2O2 --> CO2 + 2H2O
2Na + 1Cl2 --> 2NaCl
2H2 + O2 --> 2H2O
Name three elements that are named after people.
Answer:
Bohrium (Niels Bohr)
Curium (Marie and Pierre Curie)
Einsteinium (Albert Einstein
Question 2 of 10
Which of the following describes a chemical reaction?
A. Molecules interact without bonds breaking.
B. Substances change shape but not properties.
C. Atoms in substances react with each other.
D. Molecules mix without interacting.
SUBMIT
write down the value to show the mass of water produced when 168g of sodium hydrogen carbonate breaks down completely
breakfast is that carry blood away from the heart are called
What is the electromagnetic spectrum? Provide three examples of electromagnetic waves.
Answer:
The range of wavelengths or frequencies over which electromagnetic radiation extends. Radio waves, x-rays and visible light
Explanation:
Answer:
The range of wavelengths or frequencies over which electromagnetic radiation extends. Radio waves, x-rays and visible light
sorry im not doing somthing big for 5 points
Explanation:
You have a 2.0 L balloon filled with air at a temperature of 273 K.
When the volume of the balloon increases to 2.4 L, what is the new temperature?
240 K
323 K
655 K
900 K
Apply Charles law
[tex]\\ \rm\Rrightarrow V_1T_2=V_2T_1[/tex]
[tex]\\ \rm\Rrightarrow 2T_2=2.4(273)[/tex]
[tex]\\ \rm\Rrightarrow 2T_2=655.2[/tex]
[tex]\\ \rm\Rrightarrow T_2=\dfrac{655.2}{2}[/tex]
[tex]\\ \rm\Rrightarrow T_2=327.6K[/tex]
A gamma ray has a frequency of 2.88 x 1021 Hz. What does this mean?
Answer:
A gamma ray has a frequency of 2.88 x 10^21 Hz. What does this mean? It is how fast the wavelength is moving and is the number of how many pass a certain in a second. How does light emitted from a neon sign differ from light from the sun? Neon light only emits certain colors while sunlight emits all colors.
Explanation:
A gamma ray has a frequency of 2.88 x 10^21 Hz. What does this mean? It is how fast the wavelength is moving and is the number of how many pass a certain in a second. How does light emitted from a neon sign differ from light from the sun?
Calculate how many moles of element Q are in 23.53 g of element Q.
The molar mass of element Q is 40.64 g/mol
Answer:
0.579 moles
Explanation:
Moles = 23.53/40.64
= 0.5789 moles
HELP ME WITH THIS PLEASE! WILL MARK BRAINLIEST!
Please be specific and label which one goes with each question!
3LiOH(aq)+VCI3(aq) --> 3LiCl(aq)+V(OH)3(s)
what is the complete ionic equation?
what is the net ionic equation?
what are the spectator ions?
Hello!
Complete ionic equations separate the equations into ion forms. Weak electrolytes and solids (precipitate) are exempt from this rule.
Net ionic equations are complete ionic equations but the ions that don't form as a precipitate are left out of the equation.
Anything cancelled out from the complete ionic equations are considered the spectator ions.
Looking at the equation, there are no weak electrolytes (you might have not covered this material yet), and the only precipitate in the solution is [tex]V(OH)_3[/tex].
1. What is the complete ionic equation?
Let's ionize the equation. Make sure all the atoms are correspondent with their coefficients. Don't forget their charges.
[tex]3Li^+(aq)+3OH^-(aq)+V^3^+(aq)+3Cl^-(aq)= 3Li^+(aq)+3Cl^-(aq)+V(OH)_3(s)[/tex]
Label every ion as (aq), and check the periodic table for their charges. Even without looking for V, we know that it is a 3+ charge since there are 3 chlorines attached to it.
2. What is the net ionic equation?
Get rid of all of the ions that don't do anything. Consider them lazy if they don't precipitate or form a solid. In this case, anything other than V and OH should be removed since they don't react. Think of it as cancelling out the ions that are still ions both sides.
[tex]V^3^+(aq)+3OH^-(aq)=V(OH)_3(s)[/tex]
3. What are the spectator ions?
Spectator ions are the cancelled out ions from the previous problem.
[tex]3Li^+(aq)~, 3Cl^-(aq)[/tex]
Calcium oxide reacts with carbon with the following chemical reaction.
CaO + 3C → CaC2 + CO
Which statements about CO are correct?
CO will have similar chemical properties to CaC2.
CO will have similar chemical properties to CaO.
CO is likely to have different chemical properties than CaO.
CO is likely to have different chemical properties than C.
Answer:
2, 3, 4 I THIK
Explanation:
The true statement about is CO is likely to have different chemical properties than CaO.
Option (3) is correct.
In the given chemical reaction, Calcium oxide (CaO) reacts with carbon (C) to form calcium carbide (CaC₂) and carbon monoxide (CO). Let's analyze the chemical properties of CO and compare them with CaO, CaC₂, and C.
1. CO vs. CaO: Carbon monoxide (CO) is an entirely different compound from calcium oxide (CaO). CO is a colorless, odorless gas, while CaO is a solid compound. Their chemical properties will differ significantly.
2. CO vs. CaC₂: Carbon monoxide (CO) and calcium carbide (CaC₂) have distinct chemical properties. CaC₂ is a solid, and CO is a gas. Their reactivity, physical properties, and applications are dissimilar.
3. CO vs. C: Carbon monoxide (CO) and carbon (C) are related, but they are different chemical species. CO is an oxide of carbon, whereas C represents the pure element. Their bonding, reactivity, and uses are different.
Therefore, CO is likely to have different chemical properties than CaO, CaC₂, and C.
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three forms of radiation are also called ionizing radiation
Answer:
Alpha Particle, Beta Particles and Gamma Rays
Explanation:
Which of the following is supported by reliable evidence?
A. Intelligent Design
B. Theory of Gravity
C. Detoxing
D. Homeopathy
If Johnathan runs 800 meters in 200 seconds, and Abby runs 200 meters in 40 seconds, who is
faster and by how much?
Answer:
Explanation:
Solution,
For Johnathan
Distance(d)=800m
Time(t)=200sec
Now,
Speed=d/t=800/200=4m/s
For Abby
Distance(d)=200m
Time(t)=40sec
Now,
Speed=d/t=200/40=5m/s
Here, Abby is faster by 1m/s.
URGENTTTTTTTT
What is the mass of 10.00mL of water at 33℃?
Answer:
9.93712g
Explanation:
You have 10mL of water at 33 degrees, so you want to look at the density of water at 33 degrees. Then you multiply that density (.993712) by 10 and the mL cancel out and you are left with 9.93712g.
Hope this helps!
Bumper Cars at an amusement park are designed to safely collide with one another. Why does a bumper car stop moving when it strikes another car? (1 point)
A) The other cars are tightly packed, so forward motion is not possible.
B) Its energy is transferred to the other car.
C) The other car pushes back on it, so it cannot move forward.
D) Its energy is transferred to its surroundings
A bumper car stops moving when it strikes another car because : ( B ) Its energy is transferred to the other car
Conservation of energyFollowing the law of conservation of energy, energy is neither destroyed or created but converted from one form to another. when the car collides with another car, the Kinetic energy possessed by the initial car will be transferred to the new car.
when a car possess potential energy the car will be at rest that is why the bumper car stops moving after collision
Hence we can conclude that A bumper car stops moving when it strikes another car because its energy is transferred to the other car.
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Two objects in the solar system are described below.
Object 1: This object revolves around the sun and is made of ice, gas, rock and dust
Object 2: This object revolves around a planet and is made of rock
Which of the following is correct about the two objects?
(A) Object 1 is a comet, and Object 2 is a moon.
(B) Object 1 is a moon, and Object 2 is a star.
(C) Object 1 is an asteroid, and Object 2 is a planet.
(D) Object 1 is a star, and Object 2 is a comet.
Answer:
The correct answer is (A)
Explanation:
Comet are frozen pieces made out of dust, rock, and ices. Moon has a thick rocky crust.
write the action of monohydroxy benzene with aqueous bromine
The reaction yields the product compound 2,4,5-tribromophenol.
Bromination of monohydroxy benzeneBromination is an organic reaction in which aqueous bromine is made to react with another compound so as to introduce bromine into the molecule.
When we carry out the bromination of monohydroxy benzene, we obtain the compound 2,4,5-tribromophenol.
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metals are conducter of electricity how can you prove this statement? Describe
Answer:
if we connect bulb to the metal wire and connect wire's end through the battery then, the bulb will glow which shows that metal is good conductor of heat and electricity. Now if we connect bulb through a wooden scale, then bulb will not glow So,this shows it is bad conductor of heat and electricity.
What power of ten is one light year?
Answer:
9.46x10^12 kilomiters is your answer
Explanation:
Need help soon as possible
Answer:
I'm sorry if this isn't right but I think its Bromine? Lithium Bromide is an ionic bond, but the others don't bond with Lithium. Let me know if I am wrong.
Explanation:
barium hydroxide is insoluble in water. do you do any reaction that produces this compound in this experiment. If so, write down the equation for this reaction.
You are using your hot air balloon to travel. At constant pressure, you decrease the temperature of the gas by turning down the flame. What do you expect to happen to the volume of the 400 L balloon as the temperature decreases
Considering the Charles's Law, if you decrease the temperature of the gas by turning down the flame, the volume of the 400 L ballon decreases.
Charles's LawCharles's Law consists of the relationship between the volume and temperature of a certain amount of ideal gas, which is maintained at a constant pressure.
For a certain amount of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of movement of the gas molecules.
That is, the volume is directly proportional to the temperature of the gas.
Volume of the balloonIn this case, taking into account the Charles's Law, at constant pressure, if you decrease the temperature of the gas by turning down the flame, the volume of the 400 L ballon decreases.
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Give an example of chemical equilibrium you have come across into your day-to-day life. Explain how it meets the definition of equilibrium.
