The best radioisotope to use in powering planet and space exploration is plutonium-239 since it has the longest half-life of 21400 years.
What is Half-Life of radioactive element?The half-life ofa radioactive element is the time it takes for half the amount of atoms in the element to spontaneously decay.
The half-life of radioactive elements vary.
The half life of the given radioactive elements are as follows:
lithium-5 is 3.038×10^-22 secondsuranium-240 is 14.1 hours carbon-14 is 5700 years plutonium-239 is 21400 yearsTherefore, the best radioisotope to use in powering planet and space exploration is plutonium-239 since it has the longest half-life of 21400 years.
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Answer:
D. ) Plutonium-239
Which of the following reactions would you find in a radioisotope thermal generator?
The stigma on the underside of the leaf allows________to move in and out of the leaf
Answer:
The stigma on the underside of the leaf allows Gas and Water Vapour to move in and out of the leaf
A gas cylinder contains exactly 1 mole of oxygen gas (o2). how many molecules of oxygen are in the cylinder? 4.01 × 1022 molecules 6.02 × 1023 molecules 9.03 × 1024 molecules 2.89 × 1026 molecules
The number of molecules of oxygen in the cylinder would be 6.022 x [tex]10^{23}[/tex]
Number of molecules of gasesAccording to Avogadro, 1 mole of any substance contains 6.022 x [tex]10^{23}[/tex] molecules.
In this case, there is 1 mole of oxygen gas in the cylinder. Thus, following the established rule by Avogadro, there would be 6.022 x [tex]10^{23}[/tex] molecules of oxygen in the cylinder.
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Answer:
6.02 x10^23
Explanation:
i did the test
Give the name for the alkyl.
Let's see
Calculate carbons
Total 3 ,prop word root to be usedCheck bondings
All single bondsThe compound is
-CH2-CH2-CH3The name is
PropylCompounds I and II can be distinguished by comparing the number of signals in their 1H NMR spectra. How many signals are expected in the 1H NMR spectrum of each compound
The spectrum of the first compound will have only one signal, but the spectrum of the second compound will have two signals.
What is a compound?A compound is a substance formed by combining two or more different chemical elements in such a way that the atoms of the individual elements are linked together by chemical bonds that are difficult to break in chemistry.
Hence it is right to state that the spectrum of the first compound will have only one signal, but the spectrum of the second compound will have two signals.
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If 6.3 moles of O2 and 8.15 moles of N2 are placed in a 65.1 L tank at a
temperature of 348 C, what will the pressure of O2?
Answer:
Partial pressure of O2 = 4.93 atm
Explanation:
PV = n RT R = .082057 L-atm/mol-K
n = 6.3 + 8.15 = 14.45 moles
348 C = 621.15 K
P (65.1) = 14.45 ( .082057)(621.15) = 11.31 atm
Now the fraction of pressure from Oxygen is
6.3 / (6.3+8.15) * 11.31 = 4.93 atm
Balance the following chemical equations:
What type of pollution is pictured here?
Answer:this air polluction here.
Explanation:
air and soil polluction
Select the correct answer.
A compound has a molecular weight of 112.124 atomic mass units and the empirical formula C3H4O. What is the molecular formula of the compound? Use the periodic table to help you.
A.
C6H8O
B.
C9H12O3
C.
C8H4O2
D.
C4H8O2
E.
C6H8O2
.
Answer:
E
Explanation:
The empirical formula has a mass of
3*C = 3*12 = 36
4*H = 4*1 = 4
1*O = 1 * 16 = 16 Add
Total = 56
The actual mass of the molecule in nature is 112
Multiplier = nature's mass / empirical formula mass
Values
Nature's mass = 112
Empirical mass = 56
Solution
Multiplier = Natures mass/Empirical Mass
Multiplier = 112 / 56
Multiplier = 2
Formula
Nature's formula = (Emperical Mass)_multiplier
Nature's formula = (C3H4O)_2 Multiply
Nature's formula = C6H8O2
Check
C6 = 6*C = 6*12 = 72
H8 = 8*H = 8*1 = 8
O2 = 2*O = 2*16 = 32 Add
Total 112 which checks with what is given.
Select the correct answer. what is the empirical formula of a compound with 35.94% aluminum and 64.06% sulfur? a. als b. al4s6 c. als2 d. al2s3 e. als3
The empirical formula of the compound would be [tex]Al_2S_3[/tex]
Empirical formulaThe compound is composed of aluminum and sulfur:
Al = 35.94 S = 64.06
Find the mole of each component
Al = 35.94/26.98 S = 64.06/32
= 1.33 = 2.00
Divide by the smallest:
Al = 1.33/1.33 S = 2/1.33
= 1 = 1.5
Thus, the empirical formula of the compound is [tex]Al_2S_3[/tex]
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The empirical formula of the compound from the calculations done is AlS2.
What is empirical formula?The term empirical formula refers to the simplest formula of a compound. It shows the ratio of atoms of elements in the molecule.
Now, we divide each percentage with the relative atomic mass of the element;
Al - 35.94/27 S - 64.06/32
1.33 2.00
Divide through by the lowest ratio;
1.33/1.33 2.00/1.33
A - 1 S - 2
The empirical formula of the compound is AlS2.
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A solar flare may cause charged particles to enter the earth's atmosphere.
true false
Answer:
True
Explanation:
This is because the Earths ionisphere was distrubed which makes radio communications.
An Glu amino acid is found in the core (interior) of a water-soluble FOLDED protein (meaning its happy there). What must happen to the pKa of its side-chain group
Glutamic amino acid is the non-essential amino acid and an excitatory neurotransmitter. When Glu is found in the core then the pKa of the side chain group increases.
What is pKa?pKa is the acid strength or the estimate that shows whether the solution is weak or strong acid. pKa less than zero is a strong acid and portrays the bonding of the proton by the acids.
In the Glu amino acid, the value of the pKa of the side chain functional groups increases as the amino acid is found in the interior of the water-soluble folded protein structure.
Therefore, the pKa of the side-chain increases.
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What is the temperature, in degrees Celsius, of a substance with a temperature of 49K?
What is the maximum mass of ammonia that can be formed when 36.52 grams of nitrogen gas reacts with 10.62 grams of hydrogen gas according to the following equation? Please round your answer to the nearest 0.01 gram.
N2 + 3 H2 = 2 NH3
The maximum mass of NH₃ that can be formed when 36.52 g of N₂ reacts with 10.62 g of H₂ is 44.35 g
Balanced equationN₂ + 3H₂ —> 2NH₃
Molar mass of N₂ = 14 × 2 = 28 g/mol
Mass of N₂ from the balanced equation = 1 × 28 = 28 g
Molar mass of H₂ = 2 × 1 = 2 g/mol
Mass of H₂ from the balanced equation = 3 × 2 = 6 g
Molar mass of NH₃ = 14 + (3×1) = 17 g/mol
Mass of NH₃ from the balanced equation = 2 × 17 = 34 g
SUMMARY
From the balanced equation above,
28 g of N₂ reacted with 6 g of H₂ to produce 34 g of NH₃
How to determine the limiting reactantFrom the balanced equation above,
28 g of N₂ reacted with 6 g of H₂
Therefore,
36.52 g of N₂ will react with = (36.52 × 6) / 28 = 7.83 g of H₂
From the above calculation, we can see that only 7.83 g out of 10.62 g of H₂ are required to react completely with 36.52 g of N₂.
Therefore, N₂ is the limiting reactant
How to determine the maximum mass of NH₃ producedFrom the balanced equation above,
28 g of N₂ reacted to produce 34 g of NH₃
Therefore,
36.52 g of N₂ will react to produce = (36.52 × 34) / 28 = 44.35 g of NH₃
Thus, the maximum mass of NH₃ obtained from the reaction is 44.35 g
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a gas exerts a pressure of 1.00 atm at 273 K. At what tempreture the gas exerts a pressure of 4.00 atm.
Considering Gay-Lussac's law, a gas exerts a pressure of 4.00 atm at 1,092 K.
Gay-Lussac's lawGay-Lussac's law states that the pressure of a gas is directly proportional to its temperature: when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, gas pressure decreases.
Gay-Lussac's law can be expressed mathematically as follows:
[tex]\frac{P}{T}=k[/tex]
where P= pressure, T= temperature, k= Constant
This law states that the ratio of pressure to temperature is constant.
Studying an initial state 1 and a final state 2, it is fulfilled:
[tex]\frac{P1}{T1}=\frac{P2}{T2}[/tex]
Final temperatureIn this case, you know:
P1= 1 atmT1= 273 KP2= 4 atmT2= ?Replacing in Gay-Lussac's law:
[tex]\frac{1 atm}{273 K}=\frac{4 atm}{T2}[/tex]
Solving:
[tex]T2\frac{1 atm}{273 K}=4 atm[/tex]
[tex]T2=\frac{4 atm}{\frac{1 atm}{273 K}}[/tex]
T2= 1,092 K
Finally, a gas exerts a pressure of 4.00 atm at 1,092 K.
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What do you mean by cation and anion
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Cations are ions that has a positive charge on it, and since it's a positive charge, it means that the ion has more protons than the number of electrons.
On the same contray, Anions are negatively charged particles having more electrons than protons in it, and hence bearing a negative charge.
property : non - alike ions attract each other by electrostatic force.
Answer:
Cations are positively-charged ions.
Anions are negatively-charged ions.
PLS, I NEED HELP!!!!
Next, you will gradually apply heat to the sugar and observe the effects. Your goal is to identify the point at which sugar begins to melt. To get started, follow these steps. Then, answer the question that follows.
Pour 1 tablespoon of sugar into a cooking pan. Spread it out across the surface of the pan. Place the pan on a stove.
Because all stoves are different, you’ll need to identify your low, medium, and high heat settings before proceeding to step 3.
Use the method below to gradually heat the pan until you see the sugar begin to melt. Once the sugar melts, note how much time has elapsed and the final heat setting. If at any point the pan begins to smoke, immediately turn off the heat source and remove the pan from the heat. Heat the pan for these times and temperatures, stopping when the sugar begins to melt:
5 minutes on low heat
5 minutes on medium-low heat
5 minutes on medium heat
5 minutes on medium-high heat
5 minutes on high heat
When the sugar melts, turn off the stove and remove the pan from the heat. Do not touch the hot pan except by its handle. Use hot pads or oven mitts if the pan’s handle isn’t insulated. Let the pan sit off the heat on a heat-resistant surface until it cools.
Approximately how many minutes did it take for the sugar to melt? What was the final heat setting?
Repeat the process given in part D using salt instead of sugar. Did the salt melt? If so, approximately how many minutes did it take for the salt to melt?
When a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied.
What is melting?The term melting has to do with the breakdown of the bonds that hold the molecules of a substance together. Melting occurs when heat is applied continously to a body.
Now, the time taken for the sugar to melt depends on the amount of heat supplied. In other words, when a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied.
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When a high amount of heat is supplied, the sugar melts faster than when a low amount of heat is supplied. low heat makes the sugar take awhile to melt. High heat was the final heat setting. I took about 8-10 minutes.
What is the formula for the compound iodine trichoride?
Answer:
The formula is CI 3 I. Hope this helps!
Answer:
ICl3.
Explanation: trust me
Plan an investigation to examine the relationship between the amount of gas
and its volume. Identify the materials and write a procedure, identifying the
constants and variables. Conduct the investigation and record your
observations.
I can’t think of anything to use for this experiment and we aren’t told what to use so if anyone had any ideas for that I would really appreciate it
Answer:
You will need a Kukushili pressure cooker for this experiment. This pressure cooker will allow you to compress the gases and observe its volume.
Can Someone help me please…
1 How do scientists mfasure population and changes in
2 What causes populations and ecosystems to remain stable or to
change over time?
3 What factors affect populations within an ecosystem?
4 How do modest or drastic changes in ecosystems affect ecosystem
stability?
Answer:
1.Ecologists often estimate the size and density of. populations using quadrats and the mark-recapture method.
2. The two key components of ecosystem stability are resilience and resistance.
3.The availability of abiotic factors (such as water, oxygen, and space) and biotic factors (such as food) affect population
4. When the climate is changing in the colder direction it effects the planet in the opposite way than it does when it is changing in the warmer direction. Ad nauseam the contemporary, it’ll keep getting hotter and at a greater rate so the ecosystem is going to die.
What weight (in grams) of h2so4 would be needed to make 750.0 ml of 2.00 m solution?
Answer:
I think the answer should be 147
Explanation:
The ph of a solution is 7. When acid is added to the solution, the hydronium ion concentration becomes 100 times greater. What is the ph of the new solution?.
After acid was added to the solution and the hydronium ion concentration becomes 100 times greater, the pH of the new solution is 5.
What is pH of solution?The pH of a solution is defined as the logarithm of the reciprocal of the hydrogen ion concentration [H+] of the given solution.
It is expressed as;
pH = -log[ H⁺]
Given that;
pH of the solution = 7Hydronium ion concentration H⁺ = ?pH = -log[ H⁺]
H⁺ = 10^( -pH )
H⁺ = 10^( -7 )
H⁺ = 10⁻⁷
When acid is added to the solution, the hydronium ion concentration becomes 100 times greater.
H⁺ = 10⁻⁷ × 100
H⁺ = 10⁻⁵
pH of the new solution will be;
pH = -log[ H⁺ ]
pH = -log[ 10⁻⁵ ]
pH = 5
Therefore, after acid was added to the solution and the hydronium ion concentration becomes 100 times greater, the pH of the new solution is 5.
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3 Apply Many scientific words, such as table, also have everyday meanings. Use context clues to write your own definition for each meaning of the word table.
Example sentence
The books are on the table.
table:
__________
Example sentence
A data table is a useful way to organize information.
table:
__________
Answer:
Explanation:
3 Apply Many scientific words, such as table, also have everyday meanings. Use context clues to write your own definition for each meaning of the word table.
Example sentence
The books are on the table
a)6.144
b)0.644
c)-0.644
Answer:
b
Explanation:
is the dictionary definition of a word.
is the feeling or idea associated with a word.
How much carbon dioxide do the people of earth add to the atmosphere in one year?.
Answer: About 43 billion tons
Explanation:
This is gonna be quite hard to explain.
What kind of intermolecular forces act between a chloromethane molecule and a chloroacetylene molecule
Dipole to Dipole force
Explanation:
A dipole to dipole forces exists between these molecules
9. An empty, massless cube is measured to have all sides equal to 11 cm. It is floating in water and will slowly be filled with sand
that has a density of 3.5 g/cm'. What volume of sand will cause the box to sink?
sink: w cube+w sand>Fb(buoyant force)
w cube = massless = 0
w sand>Fb
w sand > 1000 x 10 x (11/100)³
w sand > 13.31 N
ρgV sand > 13.31
3.5 x 10³ x 10 x V sand > 13.31
V sand = 13.31 : 3.5 x 10⁴ = 3.803 x 10⁻⁴ m³ = 380.3 cm³
Sodium metal (Na) reacts with chlorine gas ( Cl2 ) to produce solid sodium chloride (NaCl).
A) Write an unbalanced chemical equation for this reaction.
B) explain why the equation is unbalanced
Please help me answer A and B
The unbalanced equations are the equations with different atomic numbers on the sides of the reaction. The unbalanced reaction is Na + Cl₂ → NaCl
What are balanced equations?Balanced equations are the chemical reaction representation that has an equal number of the atomic number of the same species on the left and the right side of the reaction.
An unbalanced equation between sodium metal and chloride can be shown as:
Na + Cl₂ → NaCl
The equation is unbalanced as the number of chloride ions is more on the reactant side than the product side.
The balanced reaction will be:
2 Na + Cl₂ 2NaCl
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The table describes a gas in four different containers Which container has gas stored at the highest temperature?
The container that has lowest temperature will store more amount of gas as compared to high temperature container.
Which container has gas stored at the highest temperature?At lowest temperature, the container stored the large amount of gas because at lower temperature the gases contract so more space is available for the storage of more gases.
So we can conclude that the container that has lowest temperature will store more amount of gas as compared to high temperature container.
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Aluminum Oxide is formed when aluminum combines with oxygen in the air. How many grams of Al2O3 are formed when 23.6g of Al reacts completely with oxygen?
The amount of [tex]Al_2O_3[/tex] that would be formed will be 44.59 grams
Stoichiometric calculation
From the equation of the reaction:
[tex]4Al + 3O_2 --- > 2Al_2O_3[/tex]
The mole ratio of Al to [tex]Al_2O_3[/tex] is 2:1
Mole of 23.6 g Al = 23.6/26.98 = 0.87 moles
Equivalent mole of [tex]Al_2O_3[/tex] = 0.87/2 = 0.44 moles
Mass of 0.44 mole [tex]Al_2O_3[/tex] = 0.44 x 101.96 = 44.59 grams
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