Answer:
The specific heat capacity of this material is approximately [tex]1.6\; \rm J\cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}[/tex].
(Assume that there is no energy loss. Assume that the specific heat capacity of water is [tex]4.182\; \rm J \cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}[/tex].)
Explanation:
Let [tex]c[/tex] denote the specific heat capacity of a material. Consider a sample of that material with mass [tex]m[/tex]. If the temperature of that objects changes by [tex]\Delta T[/tex], the corresponding energy change would be [tex]Q =c \cdot m \cdot \Delta T[/tex].
Start by finding the amount of energy that water has gained from the [tex]50\; \rm g[/tex] sample.
Specific heat capacity of water: [tex]c(\text{water}) \approx 4.182\; \rm J \cdot g^{-1} \cdot \left(^\circ C\right)^{-1}[/tex].Mass of water: [tex]m(\text{water}) = 500\; \rm g[/tex].Temperature change: [tex]\begin{aligned}\Delta T(\text{water}) &= T(\text{final}) - T(\text{initial}) \\ &= 23\; \rm ^\circ C - 20\; \rm ^\circ C = 3\; \rm ^\circ C\end{aligned}[/tex].That [tex]500\; \rm g[/tex] of water would have gained:
[tex]\begin{aligned} & Q(\text{water}) \\ &= c(\text{water}) \cdot m(\text{water}) \cdot \Delta T (\text{water}) \\ &\approx 4.182\; \rm J \cdot g^{-1} \cdot \left(^\circ C\right)^{-1} \times 500\; \rm g \times 3\; \rm ^\circ C \\ &\approx 6.27\times 10^{3}\; \rm J \end{aligned}[/tex].
Assume that the [tex]50\; \rm g[/tex] sample and the [tex]500\; \rm g[/tex] of water were insulated from the surroundings. The energy that water gained would be exactly the same as the energy that the [tex]50\; \rm g\![/tex] sample had released through cooling.
In other words, the [tex]50\; \rm g[/tex] sample has released approximately [tex]6.27 \times 10^{3}\; \rm J[/tex] of energy as it is cooled from [tex]100\; \rm ^\circ C[/tex] to [tex]23\; \rm ^\circ C[/tex].
Energy change: [tex]Q(\text{sample}) \approx -6.27 \times 10^{3}\; \rm J[/tex] (negative because this sample has lost energy through cooling.)Mass of sample: [tex]m = 50\; \rm g[/tex].Temperature change: [tex]\begin{aligned}\Delta T(\text{sample}) &= T(\text{final}) - T(\text{initial}) \\ &= 23\; \rm ^\circ C - 100\; \rm ^\circ C = -77\; \rm ^\circ C\end{aligned}[/tex].Rearrange the equation [tex]Q = c \cdot m \cdot \Delta T[/tex] to find an expression for specific heat capacity, [tex]c[/tex]:
[tex]\begin{aligned}c = \frac{Q}{m \cdot \Delta T}\end{aligned}[/tex].
Apply this expression to find the specific heat capacity of the sample:
[tex]\begin{aligned}c(\text{sample}) &= \frac{Q(\text{sample})}{m(\text{sample}) \cdot \Delta T(\text{sample})} \\ &\approx \frac{-6.27\times 10^{3}\; \rm J}{50\; \rm g \times \left(-77\; \rm ^\circ C\right)} \approx 1.6\; \rm J \cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}\end{aligned}[/tex].
describe how the results you obtained demonstrate the law of conversation of mass. Use a mathematical equation that demonstrates how your data matches the law of conversation of mass
A balanced chemical equation, which demonstrates that all mass is conserved throughout the reaction, demonstrates the law of conservation of mass. The quantity and types of atoms on either side of a chemical equation should be equal in a balanced chemical equation.
What is meant by the law of conservation of mass?In accordance with the principle of mass conservation, There is neither creation nor destruction of mass during a chemical process. In other words, the total masses of the reactants and products must be equal.
The reactants of photosynthesis are sunlight, 6 carbon dioxide, and 6 water. The mass of the products, which are 1 glucose and 6 oxygen, is equal to the mass of these reactants added together. Contrarily, cellular respiration uses glucose and oxygen gas to create water, carbon dioxide, and ATP, a source of useable energy.
The products of photosynthesis are the reactants of cellular respiration, which is the reverse of photosynthesis. The law of conservation of mass is also observed during cellular respiration.
A balanced chemical equation, which demonstrates that all mass is conserved throughout the reaction, demonstrates the law of conservation of mass. The quantity and types of atoms on either side of a chemical equation should be equal in a balanced chemical equation.
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Why is it important to have a boiling chip present in the boiling flask when distilling liquid mixtures?.
Answer:
they will prevent superheating of the liquid being distilled and they will cause a more controlled boil, eliminating the possibility that the liquid in the distillation flask will bump into the condenser.
Explanation:
hope this helps :3
40 POINTS PLS HELP!
1. A description of what genetically modified foods are.
2. A list of crops that are typically genetically modified.
3. An explanation of why crops are genetically modified.
4. A description of how crops are genetically modified.
5. A list of how genetically modified crops affect society and the environment.
___________________________________
Same as top but these are questions:
1. What are genetically modified foods?
2. What crops are typically genetically modified?
3. Why are crops genetically modified.
4. How are crops genetically modified?
5. how do genetically modified foods affect society in the environment.
___________________________________
And PLS, don't use this just for points!
Thank you!
Answer:
1. Foods that have changes that are chemically introduced.
2. corn soybeans apples etc
3. sot they last longer or look better
4. new dna is placed in them and their seeds
5. they are not as good for humans
Explanation:
Energy is the ability to A. use gravity.B. hold objects. C. cause change
Answer:
C
Explanation:
Hope this Helps, If it doesn't comment, and I will make my best effort to change it. :)
Atoms have kinetic energy. Why?
A 2.0 mL bubble of gas is released at the bottom of a lake where the pressure is 6.5 atm and the temperature is 10 degrees celsius. Predict the Celsius temperature of the gas bubble at the surface, where the pressure is 0.95 atm and the volume becomes 14.4 mL.
Let us assume that the bubble is h meters below the surface of the water, and P₀ is the atmospheric pressure.
Pressure only due to water at a depth of h meters would be equal to ρgh. Also, atmospheric pressure would be acting on the bubble. So, the total pressure on the gas bubble at that depth = P₀+ρgh=ρg×10+ρgh=ρg(h+10).
At the surface of water, only atmospheric pressure would be acting on the bubble i.e. P=P₀=ρg×10
As PV = constant, ρg(h+10)×V=ρg10×8V→h+10=80→h=70 meters.
Hence70m is the answer.Answer:
Explanation:
What elements makeup Mars' atmosphere?
Answer:
Carbon dioxide or co^2
Explanation:
How far does sound travel in air at 20ºC in 5 seconds?
Answer:
well, the speed is 343 m/s at 20 degrees Celsius
distance=speed*time
=343m/s *5s
=1715m
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A group of students simulates colliding air masses. Using an index card for separation, a jar of warm tap water with red food coloring is placed over a jar of cold water with yellow food coloring. The index card that separates the two bodies of water is removed. Students observe how the two fronts travel in relation to one another.
A.) Air masses are not distinguisable by color.
B.) Air masses are neither hot nor cold in temperature
C.) Air masses do not collide in real life
D.) Air masses cannot be modeled
What is the name of cells that have the ability to develop into different
kinds of cells?
Answer:
stem cells
Explanation:
hope it helps
Explain the significance of groups and periods on the periodic table
A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. ... A group is a vertical column of the periodic table, based on the organization of the outer shell electrons. There are a total of 18 groups.
Can someone please help me
A. What is the atomic number for this particle
B. What is the mass number of the particle
C.what is the overall charge on this particle
D. What element does this particle represent
E. Is this particle an atom or an ion
F. Write the symbol that represents this particle. Include the symbol, mass number, atomic number and charge
Answer:
A 16
B 30
C 2-
D sulphur
E ion
F. ( 30/16S2-)
Explanation:
rusting of steel can be prevented by coating the steel with a layer of zinc. Explain, in terms of electron transfer, why steal does not rust even if the layer of zinc is scratched so that the steal is exposed to air and water.
Answer:
Wouldn't rust because zinc will lose electrons more readily than iron and will therefore oxidize first.
Explanation:
This process whereby rusting of steel is prevented by coating the steel with a layer of zinc is known as galvanization.
Now, in this process, the steel object will be coated in a thin layer of zinc. This coating will prevent oxygen and water from reaching the underneath metal since the zinc will also act as a sacrificial metal.
Now, Zinc is used because it has a lower reduction potential than iron and thus it will get easily more oxidized than iron. Which means the zinc will lose electrons more readily than iron.
Also, since zinc has a lower reduction potential, it is therefore the more active metal. Thus, even if the zinc coating is scratched and the steel is exposed to moist air, the zinc will still get to oxidize before the iron.
Pls Help pls pls pls answer all the questions like this
1. your answer
2. your answer
3. your answer
FAST PLS I NEED AN 100%!!!!
Answer:
a person walking, a thrown baseball, a crumb falling from a table---- kinetic energyA raised weight.,Water that is behind a dam,A car that is parked at the top of a hill.----potential energy
The second law of thermodynamics is a physical law based on universal experience concerning heat and energy interconversions.
Contrast exo. and endothermic reactions and give an example for each?
Answer:
Explanation:
Endothermic reactions:
The type of reactions in which energy is absorbed are called endothermic reactions.
In this type of reaction energy needed to break the bond are higher than the energy released during bond formation.
For example:
C + H₂O → CO + H₂
ΔH = +131 kj/mol
it can be written as,
C + H₂O + 131 kj/mol → CO + H₂
Exothermic reaction:
The type of reactions in which energy is released are called exothermic reactions.
In this type of reaction energy needed to break the bonds are less than the energy released during the bond formation.
For example:
Chemical equation:
C + O₂ → CO₂
ΔH = -393 Kj/mol
it can be written as,
C + O₂ → CO₂ + 393 Kj/mol
A chemist has 3.55x1022 molecules of nitrogen monoxide. How
many moles of nitrogen monoxide does the chemist have?
Answer:
0.059 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.55 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.05897...[/tex]
We have the final answer as
0.059 molesHope this helps you
highly selective production of syngas from chemical looping reforming of methane with co2 utilization on mgo-supported calcium ferrite redox materials
An appealing technique called chemical looping reforming with CO2 splitting (CLRS) can be utilised to transform hydrocarbons into syngas, an essential industrial intermediate that can be used as a raw material for other products with added value. The partial oxidation of methane occurs using the oxygen carrier that supplies lattice oxygen, not molecular oxygen, according to the chemical looping method.
What is Syngas ?Syngas is flammable and usable as fuel. In the past, it has been used to replace gasoline when supplies are scarce; for instance, wood gas was utilised to power automobiles in Europe during World War II (in Germany alone half a million cars were built or rebuilt to run on wood gas).
Either waste materials (carbon-based) are pyrolyzed or plant biomass is gasified to produce syngas. The production of Syngas is theoretically possible from any hydrocarbon feedstock. Internal combustion engines' combustion process is mostly affected.Learn more about Syngas here:
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if 2g of potassium are added to 50g of water, what mass of h2 is produced
Answer:
1950 grams
Explanation: The mass of potassium that must react with water to produce 50.0 grams of H2 is 1950 grams
What is the emf produced in a 1.5 meter wire moving at a speed of 6.2 meters/second perpendicular to a magnetic field of strength 3.96 × 10-3 newtons/amp·meter ?
A. 37 volts
B. 0.0026 volts
C. 5.0 volts
D. 0.37 volts
E. 0.037 volts
Answer:
0.037 volts
Explanation:
When an atom of sodium and an atom of fluorine
combine to form the salt, sodium fluoride, an
ionic bond, is formed. Which statement correctly
describes the behavior of the valence electron in
the ionic bond?
A. An electron from the fluorine atom moves to
the sodium atom forming two ions.
B.
An electron from the sodium atom moves to
the fluorine atom forming two ions.
C. An electron from the fluorine atom is shared
with the sodium atom forming a sodium ion.
D. An electron from the sodium atom is shared
with the fluorine atom forming a fluoride ion.
Answer:
B. An electron from the sodium atom moves to the fluorine atom forming two ions.
Explanation:
In forming this ionic compound NaF, an electron is transferred from the sodium atom to the fluorine atom and two ions are formed.
This is the mechanism of forming ionic or electrovalent bonds. Every atom desires to have the configuration of noble gases. When a metal and non - metal approaches one another, the electronegative specie prefer to get electrons to complete its octet. The electropositive metal will prefer to lose electrons. In the case of NaF, Na will lose an electron to become isoelectronic with Ne. Fluorine gains the electron and becomes isoelectronic with ArTwo ions the attracts one another with an electrostatic force will now form.A branch of science which deals with the study of chemicals is called chemistry.
The correct answer to the question is B.
The reaction between the acid and base is called a neutralization reaction and forms the salt.
Salt is an ionic compound in which cation and anion joined together to form a compound. In an ionic compound, one element gives electrons to the other element to complete the outer shell and make a bond. In the question, sodium has more electrons and gives them to fluorine.
Hence, the correct option is B that is An electron from the sodium atom moves to the fluorine atom forming two ions.
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true or false: If the reactants have a mass of 100.00 grams, then the products must be equal to or less than 100.00 grams.
Name the chief allotopes of sulphur.How would you show that all the allotropes of sulphur consist of only sulphur?
Answer:
.
Explanation:
write and balance the equation showing the reaction between iron (iii) oxide and carbon monoxide to form iron (ii) oxide and carbon oxide. sum the coefficients
The balanced chemical equation showing the reaction between iron (iii) oxide and carbon monoxide to form iron (ii) oxide and carbon oxide is :
FE2O3 + 3CO → 2FE +3CO2
Unbalanced:
Fe2O3 + CO → Fe + CO2
The atoms of iron on the reactant side is 2 but on the product side is 1, so have to change the coefficient of the iron of the product side. Place 3 with the CO in reactants and 3 with CO2 on the product side.
A balanced chemical equation is defined as the number of atoms of each type in the reaction being equal to the reactants and product sides.
The mass and charge is equal in a balanced chemical reaction.
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can someone answer pls
I need help, idk how to do PV=nRT
Answer:
107.64L
Explanation:
V= Volume in Liter
T= Temp in Kelvin (degrees celcius + 275)
N= # Mols
P= Pressure
R= Gas Constant for atm is .0821
so
for P
V=NRT/P
(4x,0821x295)/.900=107.64L
Name two elements whose outer energy levels are complete with two electrons
Answer:
ppsuck
Explanation:
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How can nuclear energy be used in medicine
make a list of nature friendly development activities in your community
Answer:
Nature friendly activities include:
AfforestationBan on deforestationConservation of waterRecyclingReduce & ReuseUsing renewable energy.Hope it helps!
What would be the volume, in liters measured at STP, of 0.56 moles of carbon monoxide?
Answer:
"This conversions relies on the fact that a mole of gas at STP has a volume of 22.4 L. It is important to note, however, that if the conditions of the gas are different this conversion will NOT work. Under those conditions you must use the ideal gas law to convert between moles and liters."