Answer:
Due to the specific heat capacity of iron, 0.444 J/(g·°C), is more than the specific heat capacity for lead, 0.160 J/(g·°C)
Explanation:
The given parameters are;
The metals provided to melt the ice and their temperature includes;
One kg (1000 g) of iron;
Specific heat capacity = 0.444 J/(g·°C)
Temperature = 100°C
1 kg (1000 g) of lead
Specific heat capacity = 0.160 J/(g·°C)
Temperature = 100°C
Therefore, the heat provided to the ice of mass m, and latent heat of 334 J/g at 0°C by the metals are as follows;
For iron, we have;
ΔQ = Mass × Specific heat capacity × Temperature change
ΔQ[tex]_{iron}[/tex] = Heat obtained from the iron by the ice
ΔQ[tex]_{iron}[/tex] = 0.444 m × 1000 × (100 - 0) = 44400 J
Heat absorbed by the ice for melting, H[tex]_l[/tex] = Heat obtained from the iron
∴ Heat absorbed by the ice for melting, H[tex]_l[/tex] = Mass of ice × Latent heat of ice
H[tex]_l[/tex] = Mass of ice × 334 J/g = 44400 J
Mass of ice melted by the iron = 44400 J/334 (J/g) ≈ 132.9 g
Mass of ice melted by the iron ≈ 132.9 g
For lead, we have;
ΔQ = Mass × Specific heat capacity × Temperature change
ΔQ[tex]_{lead}[/tex] = Heat obtained from the iron by the ice
ΔQ[tex]_{lead}[/tex] = 0.160 m × 1000 × (100 - 0) = 16000 J
Heat absorbed by the ice for melting, H[tex]_l[/tex] = Heat obtained from the iron
∴ Heat absorbed by the ice for melting, H[tex]_l[/tex] = Mass of ice × Latent heat of ice
H[tex]_l[/tex] = Mass of ice × 334 J/g = 16000 J
Mass of ice melted by the lead = 16000 J/334 (J/g) ≈ 47.9 g
Mass of ice melted by the lead ≈ 47.9 g
Therefore, mass of ice melted by the iron, approximately 132.9 g, is more than mass of ice melted by the lead, approximately 47.9 g.
What happens in a chemical change that does not occur in a physical change?
Answer:
In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring.
As you move left to right across a period, which of the following always increases?
A)
Atomic number
B)
Atomic mass
C)
Atomic weight
D)
Shell number
Answer:
A) Atomic number
Explanation:
The following chemical reaction is balanced, but
the coefficients used are larger than necessary. Rewrite this balanced equation using the smallest coefficients possible.
9Fe(s) + 12H20(I) — 3Fe3O4(s) + 12H2(9)
Answer:
Explanation:
Divide each coefficient by 3:
3Fe(s) + 4H2O(l) ---> Fe3O4(s) + 4H2(g)
The balanced equation using the smallest coefficients possible:
3 Fe (s) + 4 H₂O (I) → Fe₃O₄ (s) + 4 H₂ (g)
What is the balanced chemical equation?A chemical equation can express a chemical reaction in terms of chemical symbols of the substances. A chemical equation exhibits reactants, products, and an arrow representing the direction of the reaction.
A balanced chemical equation exhibits an equal number of atoms of each element is equal on either side of the equation. From the law of conservation of mass, the total mass of the elements on both sides of the chemical equation.
Given, a chemical reaction is balanced, but the coefficients used are larger than required:
9Fe (s) + 12 H₂O (I) → 3 Fe₃O₄ (s) + 12 H₂ (g)
Divide the coefficients by 3 to get the smallest coefficients:
The chemical equation becomes:
3Fe (s) + 4 H₂O (I) → Fe₃O₄ (s) + 4 H₂ (g)
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ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
What is the charge on an electrically neutral atom of hydrogen?
+1
+2
0
−1
Answer:
+1
Explanation:
same amount of electrons as protons
is mechanical potential or kinetic energy
why do covalent bonds melt faster and have low melting points than ionic bonds?
Answer:
Covalent compounds have bonds where electrons are shared between atoms. Due to the sharing of electrons, they exhibit characteristic physical properties that include lower melting points and electrical conductivity compared to ionic compounds.
Explanation:
what is 0.000980 in scientific notation
Answer:
9.80x10^-4
Explanation:
Answer:
9.80 x 10⁻⁴
Explanation:
The negative means that the decimal place was moved to the right and the exponent tells you how many places it was moved.
When a metal atom gains electrons it forms an anion.
Always true
Sometimes true
Never true
If someone takes a material that looks pure, and then they do something to it that results
in two separate materials, how can they know if they originally had a pure-looking
mixture of two things that they simply separated into its parts, or if they originally had a
pure material that was a compound that was chemically broken down into new
compounds or elements?
lile
Answer:
The determination of the nature of the combination of the two separate materials in the original material that looks pure is based on the characteristic of the change process they undergo to become two separate materials.
Therefore, they can know if they initially had a mixture or a compound by the following steps;
1) If the two separated materials can be easily remixed to form the original material, then they likely have a mixture of the two separate materials
2) If the process that results in the formation of the two separate materials, involves the absorption or evolves heat or other forms of energy, then the original substance was a compound
3) If the two newly formed materials is seen to be a permanent change, then the original material was a compound
Explanation:
Which of the following is the ground state electron configuration of Ni?
Answer:
Nickel atoms have 28 electrons and the shell structure is 2.8. 16.2. The ground state electron configuration of ground state gaseous neutral nickel is [Ar]. 3d8.
Explanation:
The energy required to remove an electron from the outermost shell is called
Answer:
Ionization energy
Explanation:
Ionization energy can be defined as the energy needed to remove an electron from the outermost she'll.
The solution in the beaker was a green color. This is an example of
Answer:
That means its a Transition Metal!
Explanation:
-2(-x-3) - 4x-1=13
gig
Answer:
that means a train railroad track dude
do you mean -2(-x--3) - 4x-1=13 without the gig
Explanation:
What’s the compound name for V2(S2O3)3
Answer: I HOPE THIS HELPS, HAVE A GREAT EARLY HALLOWEEN
Explanation:
PubChem CID: 1084
Molecular Formula: S2O3(2−) or O3S2-2
Synonyms: Thiosulphate THIOSULFATE ION sulfurothioate UNII-LLT6XV39PY Thiosulfate (S2O32-) More...
Molecular Weight: 112.13 g/mol
Calculate the mass in grams of 8.24 x 1024 molecules of CO2
Answer:
Explanation:
1 mole of any gas contains 6.02 x 10²³ molecules of gas
6.02 x 10²³ molecules of CO₂ contains 1 mole of CO₂
8.24 x 10²⁴ molecules of CO₂ will contain 8.24 x 10²⁴/ 6.02 x 10²³ moles at STP
13.6877 moles
mol weight of CO₂ = 44 g
13.6877 moles of CO₂ = 44 g x 13.6877 g = 602.25 gm.
Who wrote the first modern chemical textbook?
Antoine Lavoisier
Dmitri Mendeleev
Henry Moseley
Johann Dobereiner
Answer:
A. Antoine Lavoisier
Explanation:
He is know for creating the first chemical textbook. This textbook included rules for naming different chemical compounds, which is the still the same method we use to this day.
Hoped this can help! :D
Answer:
a
Explanation:
Calculate the mass of 9.75x1021 atoms of helium.
Answer: 99.5475
Hope this helps(:
Which scenario BEST describes how an atom produces light?
electron loses energy as it transitions to lower energy level
electron gains energy as it transitions to lower energy level
electron gains energy as it transitions to a higher energy level.
electron loses energy as it transitions to higher energy level
Answer:
electron loses energy as it transitions to lower energy level
Explanation:
An atom is capable of absorbing and releasing electrons. The atom of a substance is said to be at its GROUND LEVEL STATE when it contains the lowest energy level. However, when it absorbs or takes in energy, it moves to a high energy level called EXCITED STATE. This level is unstable and hence, subject to declination.
Due to the instability of the excited state of an atom, it tends to lose the absorbed electrons and in the process of doing so, it emits or produce light. Therefore, according to this question, light is produced by an atom when the electron loses energy as it transitions to lower energy level i.e excited state to ground level state.
Plz help!
How is oxygen an element? Explain.
what skill is a scientist using when she listens to the sound that whales make
Answer:
Making observations
Explanation:
What is the mass of 1.25 x 10^24 Oxygen atoms? *
1.)32.0 g
2.)1.6 x 10^23 g
3.)O 16.0g
4.)33.2 g
Answer:
4.)33.2 g
Explanation:
(1.25E24/6.022E23)×15.99
if anyone can sole I give big brain
___. CO(g) +. ___ H2(g) ---> ___ C8H18(l) +. ___ H2O
Answer:
. 8 CO(g) + 17 H2(g) 1 C8H18(l) + 8 H2O
Explanation:
List 4 properties of ironically boned compound
Answer:
do u mean ironically? if so here are some:
they're hard and very brittle!!
good insulators
contain high melting points
the form crystals
How many moles are in 25.3 g of a sample of potassium nitrate (KNO3)?
Answer:
25.3 g of KNO₃ contain 0.25 moles.
Explanation:
Given data:
Number of moles of KNO₃ = ?
Mass of KNO₃ = 25.3 g
Solution:
Formula:
Number of moles = mass/ molar mass
Molar mass of KNO₃:
KNO₃ = 39 + 14+ 16×3
KNO₃ = 101 g/mol
Now we will put the values in formula.
Number of moles = 25.3 g/ 101 g/mol
Number of moles = 0.25 mol
Thus, 25.3 g of KNO₃ contain 0.25 moles.
is a nuclear reactor an example of fusion or fission?
Answer:
fission
Explanation:
what is the lewis structure for RnF2
Answer:
E3 ubiquitin-protein ligase RING2 is an enzyme that in humans is encoded by the RNF2 gene.
Explanation:
Lewis structure of Radon difluoride has three lone pairs and two bonding pairs.
What is Lewis structure?Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, are diagrams that depict the bonding between atoms in a molecule, as well as any lone pairs of electrons that may be present. It's used to depict how electrons in a molecule are distributed around specific atoms. Electrons are shown as "dots" or as a line between two atoms when they are bonded.
Hence, Lewis structure of Radon difluoride is
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Explain what is Thermal Energy
Answer:
Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process
Explanation:
thermal energy Is just heat
A 25.3-8 sample of an unknown compound contains
0.8 g of oxygen. What is the percent by mass of
oxygen in the compound?
The percentage by mass of oxygen in the 25.3 g sample of the unknown compound is 3.16%
From the question given above, the following data were obtained:
Mass of compound = 25.3 g
Mass of oxygen = 0.8 g
Percentage of oxygen =?The percentage of oxygen in the compound can be obtained as follow:
[tex]Percentage = \frac{mass of element}{mass of compound } *100[/tex]
Percentage of oxygen = [tex]\frac{0.8}{25.3} * 100[/tex]
Percentage of oxygen = 3.16%Thus, the percentage of oxygen in the compound is 3.16%
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Parts working together for one purpose
Answer:
A system is a collection of parts that interact together for a common purpose. But a system is not just any old collection of parts. No single part can do the job alone, and any malfunction or delay is likely to affect the whole system. A body system is a set of body parts that do a particular task.
Explanation:
WILL GIVE BRAINLIEST! URGENT!
In the vinegar and salt solution, is it possible there was some other compound that formed on the egg shell instead of the food coloring? Based on what you know about the charge on the egg shell and the ions in the solution, what might have reacted to form a compound on the shell instead of the food coloring?
Answer: Vinegar
Explanation:
The vinegar and salt affects the shell because food coloring does not affect anything besides the color so the viniger has substances which dissolves thing and the salt just made the vinegar a stronger substance. The Vinegar reactes to form a compund on the shell.