The Half-Life of the radioactive sample is 8.1 hours.
What is half life of a radioactive element?The half-life of a radioactive substance is the time taken for half the amount of atoms in the given substance to decay.
12.5 grams remains out of 100 grams of the sample.
This is 1/8 of the original samples.
1/8 of the original sample reperesent three half-lives undergone.
Half-Life of the radioactive sample = 24.3/3 = 8.1 hours
Therefore, the Half-Life of the radioactive sample is 8.1 hours.
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Apply scientific knowledge and understanding to determine how many grams of carbon dioxide are produced from the combustion of 250. g of ethane, C3H8 when O2 is in excess:
C3H8 + 5O2 ---> 3CO2 + 4H2O
Answer:
749 grams CO₂
Explanation:
To find the amount of carbon dioxide produced, you need to (1) convert grams C₃H₈ to moles C₃H₈ (via molar mass from periodic table), then (2) convert moles C₃H₈ to moles CO₂ (via mole-to-mole ratio via reaction coefficients), and then (3) convert moles CO₂ to grams CO₂ (via molar mass from periodic table). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The desired unit should be in the numerator. The final answer should have 3 significant figures because the given value (250. grams) has 3 sig figs.
Molar Mass (C₃H₈): 3(12.01 g/mol) + 8(1.008 g/mol)
Molar Mass (C₃H₈): 44.094 g/mol
1 C₃H₈ + 5 O₂ ---> 3 CO₂ + 4 H₂O
Molar Mass (CO₂): 12.01 g/mol + 2(16.00 g/mol)
Molar Mass (CO₂): 44.01 g/mol
250. g C₃H₈ 1 mole C₃H₈ 3 moles CO₂ 44.01 g
------------------ x ---------------------- x ---------------------- x -------------------- =
44.094 g 1 mole C₃H₈ 1 mole CO₂
= 749 grams CO₂
is 2.71 greater then 8?
Answer:
no
Explanation:To help you know the difference change it into a percentage, by moving the decimal two places to the right. That would give you 271% and 800% would you rather get a 271% or a 800% on a test? You would want to get an 800% because it’s a bigger number.
Please help!!
Which part shown in the diagram is positively Charged
Salt bridge
Solid Cu
Solid Zn
Wire
(I know this is late so hopefully other people find it helpful)
Answer: Solid Cu
Since this is a voltaic cell:
Copper is the cathode, therefore having a positive charge.
Zinc is the anode, therefore having a negative charge.
(Also, I took the exam and it's correct; good luck everyone!)
A solution of the ionic salt caso3 would have a ______ ph.
(acidic, basic, or neutral)
A solution of the ionic salt CaSO₃ would have an acidic pH.
What is pH?
This is referred to power of hydrogen and it measures the degree of acidity or alkalinity of a substance.
CaSO₃ which is referred to as calcium sulfite or calcium salt is formed through the reaction below and has a pH of 6 thereby making it an acidic salt.
SO₂ + CaCO₃ → CaSO₃ + CO₂
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Answer:
Basic
Explanation:
acellus
A company is announcing the construction of a new skyscraper to the public. Which model will give the best idea of how the new building will change the city skyline?
A.
a drawing showing the interior of the building
B.
a full scale, three-dimensional model of the building
C.
a rough sketch of the building's shape
D.
a drawing showing both the new and old buildings
Answer:
D.
Explanation:
This is because this option would allow one to see the sorroundings of the new building. The others only give perpectives on what the new building looks like, isolated from its sorroundings.
Suppose cobalt-60 undergoes a type of radioactive decay that does not
change the identity of the isotope. which type of decay did the isotope
undergo?
a. delta
b. gamma
c. alpha
d. beta
Gamma decay is a type of radioactive decay that does not change the identity of the isotope.
What is gamma decay?During gamma decay the nucleus emits radiation without actually changing its composition. In this type of decay only energy is released but the structure is same.
So we can conclude that gamma decay is a type of radioactive decay that does not change the identity of the isotope.
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The begining of this chemical equation represents the starting materials for a chemical reaction
which compound us likely produced by the chemical reaction H20+ SO3
If an object goes through a chemical reaction but does not change in mass that object has
Answer:
The law of conservation of mass
Explanation:
The law of conservation of mass
Determine the number of moles of O,(g) in the cylinder. The gram-formula mass of
Og (g) is 32.0 g/mol.
The number of mole of oxygen gas, O₂ in the cylinder given the data is 0.5 mole
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
How to determine the mole of O₂From the question given, the following data were obtained:
Mass of O₂ = 16 g gMolar mass of O₂ = 32 g/mol Mole of O₂ =?Mole = mass / molar mass
Mole of O₂ = 16 / 32
Mole of O₂ = 0.5 mole
Complete question
See attached photo
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how to Use your trend line to estimate the gas pressure of this system at 0°C.
Answer:
The slope of the trend line is 2.55; as the temperture.
Explanation:
The vapour pressure of water 12.3kPa at 300K. Calculate the vapour pressure of 1 molal solution of a non-volatile solute in it.
Answer:
ywhehehehehdgdudcdudcd uy dshdcvv
Explanation:
bdbdkzkzjzdkdkzdvdisisksjskakskskzbx vxydcdudschahahbshshs
An atom's electron configuration ends with 3p^3. if another atom has nine more electrons, what would be the continuation of the electron configuration?
The continuation of the electronic configuration would be [tex]3p^6, 4s^6, 3d^4.[/tex]
What is an electron configuration?Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.
The initial p-orbital (the [tex]3p^3[/tex]) is incompletely filled. Thus, the first thing would be to fill it completely ([tex]3p^6[/tex]) so as to obey the orbital-filling rule. This leaves 6 more electrons.
After 3p orbital, the next orbitals are 4s, 3d, 4p, 5s, etc.
The 4s orbital will take a maximum of 2 electrons, leaving 4 more electrons.
Next would be the 3d orbital which can take a maximum of 8 electrons, but only 4 electrons are left.
Thus, the electronic configuration would be [tex]3p^6, 4s^6, 3d^4.[/tex]and elements is Vanadium (V).
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What is the ph of a solution with a hydroxide (oh) concentration of 2.02e-5?
Answer:
The solution has a pH value of 9.3.
Explanation:
To solve this problem, we can first determine the H+ ion concentration and then use this value to calculate the pH. To find the H+ ion concentration from the OH- ion concentration, we should use Kw, which we know has a value of 1 * 10^(-14).
We can then use the following formula to solve for [H+]:
Kw = [H+][OH-]
10^(-14) = (2.02 * 10^(-5)) * [H+]
[H+] = 4.950495 * 10^(-10)
Now, we can find the pH using the formula pH = -log[H+].
pH = - log[H+]
pH = - log(4.950495 * 10^(-10))
pH = 9.3
Therefore, the correct answer is that the pH of the solution is 9.3. Note that an alternative way to solve the problem is to find the pOH from the OH- ion concentration and use the resulting value to determine the pH that way instead.
Hope this helps!
What happens when a solid is dissolved into a liquid?
O Solid particles float toward the surface layer of liquid particles.
O Solid particles sink down toward the bottom layer of liquid particles.
O Solid particles become evenly dispersed among liquid particles.
O Solid particles become suspended in the middle of liquid particles.
When a solid dissolves in a liquid to form a solution, solid particles become evenly dispersed among liquid particles.
What are solutions?Solutions are formed when a solute particle dissolves in another substance known as a solvent.
Usually, solutions are formed when solids dissolve in liquids.
The solid is the solute while the liquid is the solvent.
When a solid dissolves in a liquid, solid particles become evenly dispersed among liquid particles.
Therefore, solutions are formed when solute particles dissolve in solvents.
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Answer:
c
Explanation:
chem ed 2022
does lotus have shiny or dull body surface
Yes, it is true that the plant known as Lotus has a shiny surface.
What is Lotus?
This is referred to a type of plant which grows in mud and has micron- and nano-scale features.
It has a wax like surface which prevent dirt and water adhesion thereby making its surface to also be shiny and attracts insects for pollination in this regard.
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How do chemical weathering and deposition contribute to the formation of the features shown here?
The following chemical reaction
2H2O + 3HCl ——> 5H2O + Cl
how many moles of H2O is needed to make 3 moles of HCl?
Answer: 2 moles
Explanation:
We know from the equation that for every 3 moles of HCl consumed, 2 moles of water are consumed (based on the coefficients)
So, the answer is 2 moles.
When comparing voltaic cells to electrolytic cells, oxidation occurs at the.
When comparing voltaic and electrolytic cells oxidation occurs at both the anode and the cathode.
What is an electrolytic cell?In an electrolytic cell, the reaction is non-spontaneous so it requires some input of energy for it to function while for a voltaic cell, the reaction is spontaneous.
Oxidation occurs at the anode and reduction occurs at the cathode.
Thus, when comparing voltaic and electrolytic cells oxidation occurs at both the anode and the cathode.
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A sample of gas at a constant temperature has an initial volume of 14.5L at a pressure of 720mmHg. If the volume of gas is decreased to 10.5L, what is its pressure?
The new pressure of the gas would be 994 mmHg
Gas lawAccording to Charle's law, the pressure of a gas at a constant temperature varies inversely with its volume.
Mathematically: p1v1 = p2v2, where p1 and p2 = initial and final pressure, and v1 and v2 = initial and final volume.
In this case, v1 = 14.5 L, p1 = 720 mmHg, and v2 = 10.5 L
p2 = p1v1/v2 = 720 x 14.5/10.5 = 994 mmHg
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All the following ions have the same charge except Group of answer choices oxide. monohydrogen phosphate. peroxide. permanganate. oxalate.
All the given species have the same charge except peroxide.
Charges on ionsThe charge on monohydrogen phosphate is negative because of its formula, [tex][HPO4]^{2-}[/tex].The charge on permanganate is negative. The formula is [tex]MnO^-[/tex]The charge of oxide ([tex]O^{2-}[/tex]) is negative.The charge on peroxide is ( R−O−O−R) is neutral.The charge on oxalate, [tex]C2O4^{2-}[/tex], is negative.Thus, only peroxide is unique.
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What is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4oC?
Answer:
2,67 L
Explanation:
How can we tell the distance sediments traveled due to erosion ?
Answer:
more rounded the grains are the more they have been moved around
Explanation:
Generally – the more rounded the grains are the more they have been moved around (i.e. the longer the length of time or distance they have moved). Angular grains cannot have travelled far
geolsoc.org.uk
1-
the
Nalt and Gil-
Cu2+
ad out-
what are the spectator ions in this reaction
Answer:
cu2 is 5he correct answer
If 8. 0 ml of water is added to 2. 0 ml of a 0. 500 m koh solution, the concentration of koh is changed to.
Answer: 0.1 M
Explanation:
Originally, [tex]0.500=\frac{\text{moles of solute}}{0.002}[/tex], so there was 0.001 mol of KOH.
Now, there is 8.0+2.0=10.0 mL of solution, so the new concentration is:
[tex]\frac{0.001}{0.01}=\boxed{0.1 \text{ M}}[/tex]
What is the formula for the ether functional group?
The formula for the functional group of ether is R–O–R– group. Details about functional group can be found below.
What is a functional group?A functional group is a specific grouping of elements that is characteristic of a class of compounds, and determines the chemical properties of that class.
Ether is any of a class of organic compounds containing an oxygen atom bonded to two hydrocarbon groups.
Therefore, the formula for the functional group of ether is R–O–R– group.
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Explain how each property affects the energy in a wave:
Amplitude:
Wave speed:
Wavelength:
Frequency:
Answer:Amplitude:the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It is equal to one-half the length of the vibration path.Wave speed:Wave speed is the distance a wave travels in a given amount of time, such as the number of meters it travels per second. Wave speed is related to wavelength and wave frequency by the equation: Speed = Wavelength x Frequency. This equation can be used to calculate wave speed when wavelength and frequency are known.Wavelength:Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire. In wireless systems, this length is usually specified in meters (m), centimeters (cm) or millimeters (mm).Frequency:frequency, in physics, the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.
Explanation:
Select the correct answer from each drop-down menu. a 126.1-gram block of granite at 92.6°c is dropped into a tub of water at 24.7°c in an isolated system. the final temperature of both the granite and the water is 51.9°c. the specific heat capacity of granite is 0.795 joules/gram degree celsius, and the specific heat capacity of water is 4.186 joules/gram degree celsius. the granite block transferred of energy, and the mass of the water is .
Taking into account the definition of calorimetry, the mass of water is 35.70 grams.
What is calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance c. ΔT is the temperature variation.Mass of water in this caseIn this case, you know:
For granite:
Mass of granite= 126.1 gInitial temperature of granite= 92.6 °CFinal temperature of granite= 51.9 ºCSpecific heat of granite = 0.795 [tex]\frac{J}{gC}[/tex]For water:
Mass of water = ?Initial temperature of water= 24.7 ºCFinal temperature of water= 51.9 ºCSpecific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
For gold: Qgranite= 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)
For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qgranite = + Qwater
- 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
Solving:
4,080.15465 J= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× 27.3 °C
4,080.15465 J= 114.2778 [tex]\frac{J}{g}[/tex]× mass of water
mass of water= (4,080.15465 J)÷ 114.2778 [tex]\frac{J}{g}[/tex]
mass of water= 35.70 grams
Finally, the mass of water is 35.70 grams.
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Select all that apply.
When the products of a reaction have a higher enthalpy than the reactants:
The change in enthalpy is positive.
The reaction is exothermic.
The reaction is endothermic.
The change in enthalpy is negative.
When the enthalpy of products is higher than that of reactants, such a reaction is said to be endothermic.
EnthalpyThe enthalpy of a system refers to the heat content of the system.
When the enthalpy of reactants is higher than that of products in a reaction, such a reaction is said to be exothermic. On the other hand, if the enthalpy of products is higher than that of the reactants, it is endothermic.
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Alkaline batteries are non-rechargeable.
Why do alkaline batteries eventually stop working?
Answer:
Alkaline batteries stop working when all of the manganese dioxide has been converted.
Explanation: Hope it helps you :)))
Have a good day
Alkaline batteries eventually stop working because the chemicals inside them react and eventually use up all their energy.
The chemicals in an alkaline battery are zinc and manganese dioxide, which are separated by a separator. When the battery is used, zinc and manganese dioxide react to produce electricity.
The reaction between zinc and manganese dioxide is a one-way reaction, meaning that it cannot be reversed. This means that once the chemicals in the battery are used up, the battery will no longer produce electricity.
The rate at which an alkaline battery loses its charge depends on a number of factors, including the temperature, the amount of current being drawn from the battery, and the age of the battery.
In general, alkaline batteries will last longer in cool temperatures and when they are not being used heavily.
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Which two statements describe how volcanic activity can affect Earth's crust?
A) A volcano are most likely to form near the center of tectonic plates
B) A volcanic mountain becomes smaller each time it erupts
C) A volcano can suddenly get taller every time it erupts
D) Hot magma from inside earth is released at weak points in the crust
Answer:
D
Explanation:
The weak crust of the earth does not hold together as well as strong crust.
Answer:
A and B was right in our test.
Explanation:
A was: A volcano can suddenly get taller every time it erupts
B was: Hot magma from inside Earth is released at weak points in the crust.