Answer:
The specific heat of the metal is 0.0482 joules per gram-Celsius.
Explanation:
Block of metal is cooled by adding water and thermal equilibrium is reached. According to the First Law of Thermodynamics and by supposing the absence of energy and mass interaction of the system with surroundings, the change in the energy of the system is represented by:
[tex]\Delta U_{m} + \Delta U_{w} = 0[/tex]
Where [tex]\Delta U_{m}[/tex] and [tex]\Delta U_{w}[/tex] are the changes in internal energies of the block of metal and water, measured in joules.
The expression described above is now extended by applying the definition of internal energy for constant mass systems:
[tex]m_{m}\cdot c_{v,m}\cdot (T_{m,in}-T_{m,out}) + m_{w}\cdot c_{v,w}\cdot (T_{w,in}-T_{w,out})= 0[/tex]
Where:
[tex]m_{m}[/tex], [tex]m_{w}[/tex] - Masses of the block of metal and water, measured in grams.
[tex]c_{v,m}[/tex], [tex]c_{v,w}[/tex] - Specific heats of the block of metal and water, measured in joules per gram-Celsius.
[tex]T_{in, m}[/tex], [tex]T_{in, w}[/tex] - Initial temperatures of the block of metal and water, measured in Celsius.
[tex]T_{out, m}[/tex], [tex]T_{out, w}[/tex] - Final temperatures of the block of metal and water, measured in Celsius.
The specific heat of the metal is cleared in the equation:
[tex]c_{v,m} = -\frac{m_{w}\cdot c_{v,w} (T_{w,in}-T_{w,out})}{m_{m}\cdot (T_{m,in}-T_{m,out})}[/tex]
If [tex]m_{m} = 12.6\,g[/tex], [tex]m_{w} = 100\,g[/tex], [tex]c_{v,w} = 4,186\,\frac{J}{kg\cdot ^{\circ}C}[/tex], [tex]T_{w,in} = 21\,^{\circ}C[/tex], [tex]T_{m,in} = 94\,^{\circ}C[/tex] and [tex]T_{m,out} = T_{w,out} = 25.1\,^{\circ}C[/tex], the specific heat of the metal is:
[tex]c_{v,m} = -\frac{(100\,g)\cdot \left(4,186\,\frac{J}{g\cdot ^{\circ}C} \right)\cdot (25\,^{\circ}C-25.1\,^{\circ}C)}{(12.6\,g)\cdot (94\,^{\circ}C-25.1\,^{\circ}C)}[/tex]
[tex]c_{v,m} = 0.0482\,\frac{J}{kg\cdot ^{\circ}C}[/tex]
The specific heat of the metal is 0.0482 joules per gram-Celsius.
Is this example of a direct proportion or an inverse proportion?
A. Direct proportion
B. inverse proportion
Answer:
Inverse proportion occurs when one value increases and the other decreases. For example, more workers on a job would reduce the time to complete the task. They are inversely proportional.
Answer:
A
Explanation:
A student is reading the volume from a standard 50-mL buret identical to what you used in the lab. The bottom of the meniscus is exactly on the 20-mL line. What should she record as the correct volume
Answer:
20 mL
Explanation:
The student should record 20 mL as the correct volume.
The curved surface of a liquid that is usually observed in a buret is referred to as the meniscus. This meniscus is created as a result of the surface tension of the liquid against the walls of the buret. Hence, in order to avoid errors due to parallax, the bottom of the meniscus should be read and not the top.
Therefore, the correct volume that the student should record is 20 mL.
Why does Ce2(SO3)3 have a lower solubility than KCl?
Answer:
Down vote
A saturated solution is at equilibrium (rate of dissolution is equal to rate of crystallization) with some equilibrium constant K1. If you change the temperature of the system at equilibrium, you will observe a different equilibrium constant K2. Whether the equilibrium constant increase or decreases is described by the Van't Hoff equation:
ln(K2K1)=−ΔHR(1T2−1T1)
So it depends on the sign of the enthalpy of reaction, in this case the enthalpy of dissolution.
please help me with this question.
ps: kindly include a drawing.
Answer:
gallium has orthorhombic and forms ionic bonds with metals
Explanation:
how scientific inferences can be made from scientific observations
Answer:
The scientific method is applied to inference through the steps taken to make both inductive and deductive inferences. Inductive inference begins with an observation, and then a pattern of such observation develops. One then makes a hypothesis based on the pattern and finally a theory based on the hypothesis
Hope it helps!
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explain the formation of coke?
please answer this question
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Answer:
Here is it....
Explanation:
Why does the battery give a reading of 9V even though there are no electrons flowing around the circuit?
Answer:
because battery have it's own voltage in it's composition
A Brønsted-Lowry acid Question 9 options: A) has a lower pH than vinegar. B) is any species that donates a proton. C) is any species that accepts a proton. D) is limited to aqueous solutions.
Answer:
B) is any species that donates a proton.
Answer:
A Brønsted-Lowry acid is any substance (molecule or ion) that can donate a hydrogen ion (H+).
A Brønsted-Lowry base is any species that can accept a hydrogen ion (H+).
Explanation:
In short, acids have the ability to donate protons and bases have the ability to accept protons.
Take the following reaction for example:
H2SO4+NH3⇌NH+4+HSO−4
Sulfuric acid (H2SO4) is the Brønsted-Lowry acid because it donates a hydrogen ion. Ammonia (NH3) is the Brønsted-Lowry base because it accepts the hydrogen ion.
The Brønsted-Lowry theory also introduces the concept of conjugate acid-base pairs. A conjugate acid-base pair are two species that differ by a (H+) ion.
Based on the reaction above, the ammonium ion
(NH+4) is the conjugate acid of the base ammonia and the hydrogen sulfate ion (HSO−4) is the conjugate base of sulfuric acid.
Here's a tip to let you know which substance is the conjugate acid and which substance is the conjugate base:
A conjugate base has one less (H+) proton than the acid you started with.
A conjugate acid has one more (H+) proton than the base you started with.
So option c is correct
Is any spcies that denotes a proton
Explanation:
im doing a escape room and i dont know what the answer is
Answer:
thats pink floyds album cover LOL
but the answer is to prism
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12g of carbon react with 32g of oxygen to produce 44g of CO2 .which chemical law do the data illustrate
Answer:
Law of constant composition
Answer:
trtytytytytytyt
Explanation:
An man in Arkansas recently found a 9 carat diamond at Crater of Diamonds State Park. Five carats are equivalent to one gram, so this diamond weighs 1.8 g. Diamond is a crystalline form of the element carbon. How many atoms of carbon are in this 1.8 g diamond
Answer:
The answer is "1.8 g diamond includes 9.03e22 atoms".
Explanation:
Given:
Weight of 9-carat diamond = 1.8 g
[tex]\therefore\\\\[/tex]
weight of 1-mole carbon =12 g
[tex]\because[/tex]
calculating the moles which are available into 18 g carbon weight:
x= Carbon moles weight in 1.8 g
[tex]1 - mol\ C = 12 g\\\\x - mol\ C = 1.8 g\\\\\to x = \frac{(1.8 \ g \times 1\ mol\ C)}{ 12 \ g}\\\\\to x = 0.15\ moles[/tex]
In 1 mole element associated with Avogadro's number that is [tex]6.02 \times 10^{23}\\\\[/tex]
Carbon includes in 1 mol[tex]=6.02 \times 10^{23}\ atoms\\\\[/tex]
0.15 mol of carbon includes:
[tex]= 0.15 \times 6.02 \times 10^{23} = 9.03 \times 10^{22}\ atoms.[/tex]
Using the scientific notation:
0.15 mol of carbon includes: 9.03e22 atoms. So, 1.8 g diamond includes 9.03e22 atoms.
Which medicines are including Chemicals?
Can you help Please!
Answer:
Compounds used as medicines are most often organic compounds, which are often divided into the broad classes of small organic molecules (e.g., atorvastatin, fluticasone, clopidogrel) and "biologics" (infliximab, erythropoietin, insulin glargine), the latter of which are most often medicinal preparations of proteins
Define force and speed
Force = The external energy that changes or tends to change the state of any body or object is called force.
Speed = The rate of distance is called speed.
Answer:
Force is a push or pull which changes or tend to change the position of a body.
The rate of change its position with time or magnitude is called speed.
which of the following compounds is carbon tetrafluoride
Answer: CF4 is the formula
Explanation:
Answer:
CH4
Explanation:
This answer is for APEX
When two ionic compounds are dissolved in water, a double replacement reaction can... Group of answer choices occur if two of the ions form an insoluble ionic compound, which precipitates out of solution occur if the ions react to form a gas, which bubbles out of the solution never occur since all ions are in water occur if the ions react to form a gas, which bubbles out of the solution ionic compounds only react with nonmetals
Answer:
occur if two of the ions form an insoluble ionic compound, which precipitates out of solution
Explanation:
When two ionic compounds are dissolved in water, a double replacement reaction takes place if two of the ions form an insoluble ionic compound, which precipitates out of solution. In double displacement reaction ions switch partners. And hence, produce an insoluble precipitate.
Which of the following is NOT a physical property?
Viscosity
Reactivity
Malleability
Density
Answer:
reactivity is NOT a physical property
The primary function of a scuba regulator is to: Reduce high-pressure gas in the scuba cylinder to a more breathable intermediate pressure. Reduce high-pressure gas in the scuba cylinder to ambient (surrounding) pressure. Provide a diver with a continuous flow of oxygenated air. None of the above.
Answer:
Reduce high-pressure gas in the scuba cylinder to ambient (surrounding) pressure.
Explanation:
The primary function of a scuba regulator would be to reduce high-pressure gas in the scuba cylinder to ambient pressure.
A scuba regulator is a structure found attached to the scuba cylinder usually carried by scuba divers. The structure regulates the pressure of the breathing gas in the cylinder to a safe level before the gas becomes available for the breathing process of divers.
Usually, the gas in a scuba cylinder is at a high level. Hence, what the regulator does is to bring it down to a level that would be safe for the breathing of the diver.
Select the correct answer. Which state of matter is highly compressible, is made of particles moving independently of each other, and is present in large quantities near Earth's surface? A. solid B. liquid C. gas D. plasma
can you solve this.
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Answer:
12
45
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Answer:
The answer is below
Explanation:
1. Fractional Distillation
2. Simple Distillation
3. Filtration
4. Steam distillation or lemon grass oil extraction
explain why ply(ethene) can become a pollutant?
Answer:
ipotseeeeeeeeeeeeeeee
Which statement describes the VSEPR theory?
A.
Electron pairs in the valence shell of an atom have a tendency to attract other nearby electron pairs.
B.
Electrons in the valence shell of an atom exert a repulsive force on other atoms while forming a chemical bond.
C.
Electron pairs in the valence shell of an atom exert a repulsive force on all other electron pairs in the valence shell of the atom.
D.
Electrons in the valence shell exert a repulsive force while completing their octet during the formation of chemical bond.
Answer:
A.
Electron pairs in the valence shell of an atom have a tendency to attract other nearby electron pairs.
Hope it helps you.how many carbon atoms are in .650 gram tablet of aspirin (C9H8O4)?
Answer:
For example, in a molecule of aspirin, C9H8O4, there are 9 carbon atoms, 8 hydrogen atoms and 4 oxygen atoms. compound.
Explanation:
The carbon atoms are in 0.650 gram tablet of aspirin (C9H8O4) is 3.24 x 10² atoms.
What are atoms?Atoms are defined as the smallest unit of matter that can be divided without releasing electrically charged particles.
After the Big Bang, the building blocks of matter were generated is known as atoms.
Molar mass of aspirin = 180.2 g
Number of carbon atoms
= 0.650 g x 1 mole aspirin / 180.2 g x 9 / 1 mole aspirin
= 3.24 x 10² atoms
Thus, the carbon atoms are in 0.650 gram tablet of aspirin (C9H8O4) is 3.24 x 10² atoms.
To learn more about atoms, refer to the link below:
https://brainly.com/question/1566330
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how much energy has your body used, in joules, if your health device indicates that 450 calories were burned during your workout
Answer:
Total energy consumed = 1,882.8 joules
Explanation:
Given:
Calories burned = 450 calories
Find:
Total energy consumed
Computation:
1 calorie = 4.184 joules
So,
450 calories = 4.184 × 450
450 calories = 1,882.8 joules
Total energy consumed = 1,882.8 joules
Is wax a good conductor of electricity?
in one to two sentences, explain why structural formulas are good for depicting polymers
Structural formulas of polymers show the actual arrangement of atoms within the polymer. This helps us to explain some of the observed properties of the polymer.
A polymer is composed of monomers. Monomers are small molecules which could link together to form a larger molecule.
There are three kinds of formulas that could be used to represent a chemical substance;
Empirical formulaMolecular formulaStructural formulaTh structural formula shows the actual arrangement of atoms in the polymer. When we have an idea of the actual arrangement of atoms in the polymer, certain properties of the polymer substance become easily understandable.
Learn more: https://brainly.com/question/1443134
Which of the following is true of science? (2 points)
It can be disproven by philosophy and religion.
It does not change after new evidence is discovered.
It is based on the personal opinions of scientists.
It is based on testable and replicable evidence.
Answer:
It is based on testable and replicable evidence.
calculate the atomic number of an element whose neutral atom has four electrons in its valence shell and its valence shell is the m shell
Answer:
The atomic number of the atom is 14.
Explanation:
The following data were obtained from the question:
Valence electrons = 4
Atomic number =.?
From the question given, we were told that the valence electron is in the m shell. Thus, we can say:
M shell = 4 electrons
The number of shells of the atom can be written in the order K, L, M with M as the last shell because we were told that the valence electrons i.e electrons in the outer shell is located at the M shell.
From a detailed knowledge of atom,
K shell = 1st shell
L shell = 2nd shell
M shell = 3rd shell
The first shell, K of an atom can only accommodate 2 electrons while others can accommodate a maximum of 8 electrons.
Note: we can only put electrons in another shell if a shell is already having 8 electrons. This rule only applies to the 2nd shell and above.
Thus, the atom in question has the following electrons:
K shell = 1st shell = 2 electrons
L shell = 2nd shell = 8 electrons
M shell = 3rd shell = 4 electrons
To get the atomic number of the atoms, we simply add all the electrons together.
This is illustrated below:
Atomic number = 2 + 8 + 4
Atomic number = 14
Therefore, the atomic number of the atom is 14.
Answer:
The answer on Edge is,
C. the number of valence electrons an atom has
The reactivity of elements can be predicted based on the position of an element in the periodic table. Based on the periodic table, which of the following elements would be expected to be the most reactive?
Iodine (I)
Iodine (I)
Chlorine (Cl)
Chlorine (Cl)
Fluorine (F)
Fluorine (F)
Bromine (Br)
Answer:
Chlorine (Cl) is most reactive out the the listed elements.
Answer:
iodine
Explanation:
It is the most reactive on the periodic table.
write the molecular formula of nitrate using criss cross method
Answer:
NO3 that is the answer to the question