Answers
We can say that Javier is right because the reactivity of the elements tends to decrease from left to right.
What is the periodic table?The periodic table is an arrangement of the elements in order of increasing atomic number. Let us note that the modern periodic law states that the properties of the elements is a periodic function of their atomic numbers .Thus the atomic numbers of the elements tends to increase from left to right in the periodic table as we can see in the image that have been attached to the question above.
Now, we know that the reactivity of the elements also tend to decrease from left to right. This is because, the heavier the element, the less reactive that the element is. Recall that every period that we can find in the periodic table tends to end up with a non reactive noble gas element.
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Related Questions
5) According to the quantum theory of atomic structure, an atom has all EXCEPT which of these
characteristics?
a) Electrons in atoms have quantized energies
b) Electrons in atoms are bound to the nucleus by electrostatic attraction
c) When electrons are excited, only discrete amounts of energy can be absorbed
d) The ground state of an atom represents the absence of quantized energy
Answers
According to the quantum theory of atomic structure, an atom has all the characteristics except d) The ground state of an atom represents the absence of quantized energy.
In atomic structure, what does quantum mechanics mean?Science that studies how matter and light behave on an atomic and subatomic scale is known as quantum mechanics.
It makes an effort to explain and describe the characteristics of molecules, atoms, and their building blocks, including electrons, protons, neutrons, and other less familiar particles like quarks and gluons.
What is the quantum theory?Modern physics’ theoretical underpinning, quantum theory, describes the nature and behavior of matter and energy at the atomic and subatomic scales.
Quantum physics and alongside quantum mechanics are the terms that refer to the nature and behavior of matter and the energy present at that level.
How can quantum mechanics explain how an atom stays stable?Atoms can be stable because the attraction caused by potential and the spreading out caused by quantum mechanics balance each other out.
The orbit of an electron around an atom in classical mechanics is unstable because the energy required to maintain the orbit is released as light.
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balance the equation
S(s) + O2(g)
Answers
Answer:
- Balancing equation must encounter the equality in moles of both reactants and products. (The left hand side must be equal to the right hand side)
- For the low concentration of oxygen, sulphurdioxide is produced and equation is balanced as below
[tex]{ \rm{S _{(s)}+ O _{2(g)} → SO _{2(g)}}}[/tex]
- For high oxygen concentration, sulphurtrioxide is produced and equation is balanced as below;
[tex]{ \rm{2S _{(s)}+ 3O _{2(g)} →2 SO _{3(g)}}}[/tex]
Should you use the flash above why or why not
Answers
Should you use the flash above because in the above its dark at night
Flash is a popular authoring software developed by macromedia is used to create vector graphics based animation programs with full-screen navigation interfaces, graphic illustrations, and simple interactivity in an resizable file format that is small enough to stream across a normal modem connection and we should use flash because creating games, making presentations, animations, visualizations, webpage components, and many other interactive applications and at the above we should use flash because its so dark at night
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Someone please help me with this. . .
Answers
How do South Floridians get our drinking water?
Answers
Instead of snowcapped mountains that store water in anticipation of warmer temperatures, the majority of our drinking water comes from underground "mountains" of porous materials called aquifers that are replenished by rain. The Biscayne Aquifer is the primary source of fresh water for South Florida's lower east coast.
Explanation:Florida's water supply is derived from the state's numerous systems of rivers, streams, wetlands, lakes, springs, aquifers, and estuaries.In Florida, you can drink tap water, and the water is considered safe to drink. The contaminants found in Florida's tap water are typically lower than the Environmental Protection Agency's MCLs (Maximum Contaminant Levels) (EPA).Florida's burgeoning population is writing a water check that the state's aquifers cannot cash; from lawn sprinklers to kitchen faucets, the state needs to cut back and use less water. In just over 50 years, half of the freshwater basins in the United States may be unable to meet our usage demands.The majority of the fresh water we use is derived from underground aquifers. Aquifers are made up of multiple layers of porous rock that hold water, such as limestone or sandstone. Cities and towns, businesses, and agriculture rely heavily on these aquifers for water.To learn more about drinking water in Floridians refer to :
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Table 1.2
Observation
Color of BTB drop on previous acid drop is:
Yellow, but not all the way out
Color of BTB drop on previous base drop is:
Blue
Color of drop of BTB while still in the bottle is:
Blue
Color of BTB on paper is:
Yellowish blue
Table 1.3
Observing and Inferrir
Your inference
(sample inference ) BTB in the presence of
acid is colored
Answers
The color of the BTB in presence of acid is yellow, the color of BTB in presence of base is blue, the of the BTB while still in the bottle in presence of base is blue.
What is inference?An inference is defined as a process of deduction that involves making educated predictions about missing bits of information based on known information.
It can also be defined as the process of drawing a reasonable judgment based on observation and prior information.
The color of BTB drop on paper is yellowish blue because of presence of acid base mixture. The color of BTB when drop of base is added to an acid is blue because of excess of base. The color of BTB when drop of acid is added to an base is yellow because of excess of acid.
Thus, the color of the BTB in presence of acid is yellow, the color of BTB in presence of base is blue, the of the BTB while still in the bottle in presence of base is blue.
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Good question for compound
Answers
Question 14 of 26
Write the balanced COMPLETE ionic equation for the reaction when Kl and
AgNO3 are mixed in aqueous solution. If no reaction occurs, simply write
only NR.
Answers
AgNO3(aq)+KI(aq)→AgI(s)+KNO3(aq) is the balanced complete ionic equation for the reaction when Kl and AgNO3 are mixed in aqueous solution.
If KI and AgNO3 interact, would a precipitate result?Since KI does not combine with any of the other reagents to produce a white precipitate, 1 must be AgNO3, and 2 must be KI. 3 is presently still a mystery. Both H2SO4 and BaCl2, most likely the latter, can produce some white precipitate when combined with AgNO3, and neither reacts with KI.
An ionic equation is a chemical equation in which the electrolytes in aqueous solution are described as dissociated ions. It is similar to a molecular equation in that it represents compounds as molecules.
AgX (X = Cl, Br, or I) precipitates from the reaction of AgNO3 with halide ion solutions are employed in photographic films.
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If the Ksp for Cu(OH)2 is 2.2 x 10–20, what is [Cu2+]?
Select one:
1.8x10–7
1.7x10–8
1.2x10–6
1.5x10–10
4.0x10–4
Answers
The Ksp of Cu²⁺ is 1.8x10–7.
The solubility product regular, Ksp, is the equilibrium steady for a strong substance dissolving in an aqueous solution. It represents the level at which a solute dissolves in solution. The greater soluble a substance is, the better the Ksp price it has.
Calculation:-
Cu(OH)₂ solid ⇔ Cu²⁺ (aq) + 2OH⁻(aq)
∴ Ksp = [Cu²⁺].[OH⁻]²-------------------------(1)
Now, 1 mole Cu(OH)₂ dissolves in water to give 1 mol Cu²⁺ and 2 moles OH⁻ ions.
So, if we consider [Cu²⁺] = x and [OH⁻] = 2x
from equation (1)
we get,
2.2×10⁻²⁰ = x.(2x)²
⇒ 2.2×10⁻²⁰ = 2x³
⇒ x = (2.2×10⁻²⁰/4)¹/³
X = 1.8 × 10⁻⁷
∴ [Cu²⁺] = 1.8 × 10⁻⁷ (M)
and [OH⁻] = 2× 1.8 × 10⁻⁷
= 3.6 × 10⁻⁷ (M)
Solubility equilibrium is a form of dynamic equilibrium that exists when a chemical compound in a strong country is in chemical equilibrium with a solution of that compound. The strong can also dissolve unchanged, with dissociation, or with a chemical reaction with another constituent of the solution, inclusive of acid or alkali.
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To find the volume of your element, you completed water displacement, which is calculated by Final volume - Initial volume. Originally 14.0 mL of water was placed into the graduated cylinder. After you object was placed into the graduated cylinder, the water level raised to 20.6 mL. Calculate the volume of the object.
Answers
The volume of the object is 6.6 cm³
The amount of space occupied by a three dimensional figure as measured in cubic units and when an object enters water it pushes out water to make room for itself and the object pushes out a volume of water that is equal to its own volume and this is called displacement
So here given data is 14.0 mL of water was placed into the graduated cylinder and then the water level raised to 20.6 mL so we have to find volume = ? here final volume = 20.6 mL and initial volume = 14.0 mL
Volume = final volume - initial volume
Volume = 20.6 mL - 14.0 mL
Volume = 6.6 cm³
The volume of the object is 6.6 cm³
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What are the products of the neutralization reaction between HCI and
Ca(OH)2?
Answers
Explanation:
The final products of the reaction between HCl and Ca(OH)2 can be Ca(OH)Cl, CaCl2, or both simultaneously depending on the temperature, HCl concentration and reaction time
Determining the Concentration of Citric Acid in 7-Up (soft drink) Using Acid-Base Titration. Titration of 7-Up:
1. Obtain 50 mL of your soft drink sample. The soft drink samples in your lab have been opened several days in advance to assure it is decarbonated.
2. Add 10 mL of the soft drink into a clean 250 mL Erlenmeyer.
3. Add 2 to 3 drops of phenolphthalein.
4. Fill your burette with the standardized NaOH.
5. Add the NaOH solution to the soft drink until the first faint lasting pink color
appears.
6. Repeat this part two more times.
7. Calculate the molarity of the citric acid in the soft drink.
And Calculate the w/v% for citric acid in the soft drink.
Answers
The molarity of the citric acid in the soft drink is 0.00385M and the w/v% for citric acid in the soft drink is 7.99 g/L
Citric acid occur naturally in lemon, limes, pineapples and citric acid used as a flavoring and preserving agent and here given experiment are given obtain 50 mL of your soft drink sample the soft drink samples in your lab have been opened several days in advance to assure it is decarbonated. add 10 mL of the soft drink into a clean 250 mL Erlenmeyer add 2 to 3 drops of phenolphthalein fill your burette with the standardized NaOH add the NaOH solution to the soft drink until the first faint lasting pink color appears repeat this part two more times and then the molarity of citric acid in soft drink are 0.00385M and we have to calculate w/v% for citric acid in the soft drink = ?
So w/v% = g of solute/ 100ml of solution = 39.99/100×20 = 7.99 g/L
Concentration of citric acid in soft drinks are 7.99g/L
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A student determines the density of an object to be 0.761g/mL. This type of data is
Answers
If a student determines the density of an object is 0.761g/mL, then this type of data is quantitative continuous data.
What is quantitative continuous data?In mathematics, the expression quantitative continuous data is used to denote a type of data that can be expressed as a continuous range of variations instead of discrete variation.
Quantitative continuous data are a special class of mathematical numeration data that may include both decimals and factions and therefore represent an infinite number of possibilities in a given range for a particular parameter to be measured in normal conditions.
Therefore, with this data, we can see that quantitative continuous data are expressed by decimals and or fractions and they represent infinite values for a particular mathematical range, thereby being distinct from discrete values that are represented by different types of finite values which do not include decimals.
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i need help with chemistry equation
Answers
The theoretical yield of the reaction is 12.1 g and the percent yield of the reaction is 77.4%.
What is the percentage yield of the calcium sulfate?Let us recall that when we are carrying out any kind of calculations that involves the substances that are used or formed in a reaction we must have to make recourse to the stoichiometry of the reaction. This is where the relationship between the reactants and the products could be understood well here.
Now we have the chemical reaction equation as;
[tex]H_{2} SO_{4} (aq) + CaOH(aq) ----- > CaSO_{4} (s) +H_{2} O(l)[/tex]
We can see that the reaction can be found to be 1:1 from the reaction equation as shown.
Number of moles of calcium hydroxide = 6.56 g/74 g/mol = 0.089 moles
It then follows that the limiting reactant is calcium hydroxide.
Theoretical yield of the calcium sulfate = 0.089 moles * 136 g/mol = 12.1 g
Then the percent yield = 9.37 g/12.1 g * 100/1
= 77.4%
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Describe the structure of fatty acids, triglycerides phospholipids, and steroids.
Answers
The structure of fatty acids involves long carbon-based chains with a carboxyl group (―COOH) located in the end, triglycerides phospholipids contain a phosphate group and glycerol, while steroids are cyclic and they contain C atoms linked via 4 fused rings.
What are lipids?Lipids are a broad category of biomolecules that include fatty acids, triglycerides phospholipids, and steroids. For example, fatty acids are long carbonated chains that contain exactly identical CH2 groups in the interior of the molecule and a carboxyl group (―COOH) located at one extreme side.
Triglycerides phospholipids are composed of three fatty acids chains linked to a glycerol backbone and also a phosphate group that may confer polar properties to the molecule.
Finally, steroids are another important class of lipids composed of several carbon-based fused rings.
Therefore, we can conclude that fatty acids, triglycerides phospholipids, and steroids are structurally different lipids that are mainly composed of carbon-based structures.
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An RNA virus is a virus that has RNA as its genetic material. The base compositions of two
kinds of RNA viruses are the following:
RNA virus (#1) 20.2% A, 20.0% U, 29.8% G, and 30.0% C.
RNA virus (#2) 12.2% A, 37.8% U, 12.2.% G, and 37.8% C.
Which of the following correctly describes the genetic materials of these two DNA viruses
Answers
Based on the base composition of the two kinds of RNA viruses, Therefore, in virus 1, A pairs with U while G pairs with C, whereas in virus 2, A pairs with G while U pairs with C.
What is RNA?RNA is one of the two genetic materials that living organisms use to store genetic information. The second genetic material is DNA.
RNA is the genetic material whose sugar backbone is ribose sugar.
Also, one of the four nucleotides in RNA is Uracil.
These are differences between RNA and DNA whose sugar backbone is deoxyribose and where the nitrogenous base in place of uracil is thymine.
RNA forms the genetic material in some viruses, whereas DNA is the genetic material in other living organisms.
RNA viruses are known as retroviruses.
In base pairing in RNA, A pairs to U, while G pairs to C. Therefore, the ratio of the two base pairs is always equal.
Considering the two RNA viruses given;
The base compositions of two kinds of RNA viruses are as follows:
RNA virus (#1) 20.2% A, 20.0% U, 29.8% G, and 30.0% C.
RNA virus (#2) 12.2% A, 37.8% U, 12.2.% G, and 37.8% C.
Comparing the base compositions of the two viruses:
Virus 1 has equal ratios of the base pairs, A and U, as well as G and C.
Virus 2 has equal ratios of the base pairs, A and G, as well as U and C.
This means the base pairing in virus differs from the base pairing in virus 2.
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QUESTION 2
What symbol is used to represent the factor 10²?
K
P
р
H
Answers
Answer:
D. h
Explanation:
hecto (h) = 10^2
A geologist determines that a rock is approximately 123,000,000 years old. Which of the following is the correct way to express the number in scientific notation?
Answers
The correct way to express the number 123,000,000 years old in scientific notation is 1.23 x 10⁸.
What is Scientific notation?This is referred to as a way of expressing numbers which are too large or too small and is often difficult to write them in decimal form. An example of such large numbers is 123,000,000.
This type of numbers can be written in the powers of 10 which helps compress it into smaller forms.For example 1000 can be written in the form 1 × 10³ which when expressed will still give the same result.
In the case of 123,000,000, we count from the back and put the decimal point between the firs two digits and the number counted is then expressed as the power of the number being expressed. We count eight times to get to 1.23 which is then expressed as 1.23 x 10⁸ therefore making it the correct choice.
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1. Which element listed below should have chemical properties similar to carbon (C)?
a. Li b. Si c. Br d. Ne
Answers
Si (Silicon) because it is in the same group as carbon.
Read this revised version of paragraph 1:
She studied the form in front of her. There was a long line of people waiting to renew their licenses and take driving exams. From her seat at the Department of Motor Vehicles, she could spot some of her classmates from school. Many of them looked like deer caught in headlights as they waited for the examiner to call their names. She had been in their shoes not too long ago, so she sympathized with them. Realizing that she was ignoring her task, she turned her gaze back to the form. It had the words voter registration application printed in bold red letters at the top.
In comparing the two versions, what effect does point of view have?
Responses
A The point of view makes the first paragraph more personal.The point of view makes the first paragraph more personal.
B The point of view makes the first paragraph less informative.The point of view makes the first paragraph less informative.
C The point of view makes the second paragraph less interesting.The point of view makes the second paragraph less interesting.
D The point of view makes the second paragraph more effective.The point of view makes the second paragraph more effective.
Answers
This perspective makes the second paragraph less interesting. This perspective makes the second paragraph less interesting. Option C.
A ballot is a device used to vote in elections and can be a piece of paper or a small ball used in secret ballots. This card is valid in full legal sense at any authority or private institution that requires presentation of a voter card. The validity of this card is temporary as it relies on the results of an automated fingerprint identification system.
The citizens over the age of 18 may not be denied or restricted by the United States or any other state based on age. Common voting methods in such institutions are vote-for-vote, ascending voting, and show of hands. Other forms of voting include recorded voting and balloting. The General Assembly may determine the voting procedure by accepting a motion.
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Calculate the mass of ammonia NH3 that contains a billion 1.0x10^9 hydrogen atoms.
Answers
1.0x10^9 H atoms x 1 molecule NH3/3 H atoms x 1 mol NH3/9.02x10^23 molecules x 17 g/mol = 9.4x10^-18 g NH3.
The mass of the formula is obtained by summing the masses of the individual atoms in the compound's formula. Correct chemical formulas are electrically neutral no net gain or loss of electrons so ions can be considered atoms in chemical formula mass calculations. The formula mass of a molecule is the sum of the atomic weights of the atoms in the compound's molecular formula.
Ammonia is formed from three hydrogen atoms and one nitrogen atom. Therefore, three hydrogen atoms each share one electron with nitrogen to form three covalent bonds, forming one ammonia NH3 ammonia molecule. The total mass of a compound is the sum of the masses of two hydrogen atoms and one oxygen atom. Your mass is the same wherever you go in space. Weight, on the other hand, varies from place to place.
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if the fire has already started how would you ensure that there is no continuous supply of oxygen and ignition temperature is not reached
Answers
Answer:
However, ignition temperature is the lowest temperature at which a volatile material will be vaporised into a gas which ignites without the help of any ignition source. The ignition temperature is different from flash point since
The fire can be stopped by removing the supply of oxygen by blanketing the fire with foam, sand, etc. The temperature can be lowered by using water. Using the nitrogen tank to reduce the oxygen concentration can extinguish the fire.
What is ignition temperature?Ignition Temperature can be described as the minimum temperature required by the substance to burn or catch fire. Burning or Combustion can be defined as a spontaneous as well as an exothermic process.
This process is exothermic in nature as heat is released during the process. We give energy to the substance just to begin the process and combustion will happen until the whole substance undergoes combustion.
Combustion is dependent on many factors such as the nature of the substance, the amount of oxygen present as combustion occurs in the presence of oxygen, the surface area of the substance, etc.
The amount of oxygen is an important factor as it enables how efficiently the combustible material undergoes combustion. Since combustion is an exothermic process, there are a variety of fuels and by burning them we generate energy.
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which type of wave has the highest frequency?
Answers
Answer:
Gamma rays have the highest frequency.
Explanation:
science.
I need help with this homework assignment problem
Answers
Answer:. Chemical symbol for ion is : S, 16 electrons,
Explanation: If you add the electrons (which is the exponents of each one you get:
2 + 2+ 6+2+4 = 16. So the atom has 16 protons and 16 neutrons. Neutrons have no charge and protons are positive so to balance out the 16 positive protons there are 16 electrons. The atomic number is 16 and on the periodic table that is sulfur. The symbol is S.
3 d orbitals are vacant in sulphur but are accessible, so it can make strong covalent bonds.
Answer:
A. The ion is Ar^2+
B. 18
C. 0
Explanation:
There are total of 2 + 2 + 6 + 2 + 4 = 16 electrons
since the cation is +2, it's neutral state should be 16 + 2 = 18
A. The ion is Ar^2+
B. 18
C. since 3p => 4s => 3d, so there is no 3d
The severity of a tropical storm is related to the depressed atmospheric pressure at its center. In August 1985, Typhoon Odessa in the Pacific Ocean featured maximum winds of about 90 mi/hr and pressure that was 40.0 mbar lower at the center than normal atmospheric pressure. In contrast, the central pressure of Hurricane Andrew (pictured) was 90.0 mbar lower than its surroundings when it hit south Florida with winds as high as 165 mi/hr.
If a small weather balloon with a volume of 50.0 L at a pressure of 1.00 atmosphere was deployed at the edge of Typhoon Odessa, what was the volume of the balloon when it reached the center?
Answers
If a small weather balloon with a volume of 50.0 L at a pressure of 1.00 atm was developed at the edge of Typhoon odissa , the volume of the balloon when it reaches the center was 52.63 L
According to boyle's law :
P1V1 = P2V2
here:
P1 = 1 atm
V1 = 50.0 L
P2 = ( 1atm - 0.050 atm ) = 0.95 atm
V2 = ?
V2 = P1V1/P2
V2 = (1 × 50.0 ) / 0.95
= 52. 63 L
Thus, If a small weather balloon with a volume of 50.0 L at a pressure of 1.00 atm was developed at the edge of Typhoon odissa , the volume of the balloon when it reaches the center was 52.63L
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I need help with this homework assignment problem
Answers
Answer:
A. The ion is Ar^2+
B. 18
C. 0
Explanation:
There are total of 2 + 2 + 6 + 2 + 4 = 16 electrons
since the cation is +2, it's neutral state should be 16 + 2 = 18
A. The ion is Ar^2+
B. 18
C. 0
please help fast
The table compares some characteristics of two atoms.
Use the table to determine the number of protons for each atom. Then, choose the statement below that is true about the two atoms.
Answers
Answer:
C. Atom X and atom Y are in the same row on the periodic table
Explanation:
The number of protons in each atom:
X = 7 - 4 = 3 which is Li
Y = 9 - 5 = 4 which is Be
A. wrong because X and Y are not in same family
B. wrong because Y is in the column to the right of X
D. wrong because X and Y are not the same element
15 organic acids and their sources
Answers
Some organic acids are their sources are given below:
Lactic acid - milkascorbic acid - fruitsoxalic acid - grapescitric acid - citrusacetic acid - vinegarpyruvic acid - glycolysisfumaric acid - TCA cycleaspartic acid - proteinsglutamic acid - proteinssuccinic acid - TCA cyclemaleic acid - TCA cycleTartaric acid - grapesUric acid - ureaformic acid - antsglucuronic acid - glucoseWhat are organic acids?Organic acids are acids that are obtained from organic sources or living organisms.
Organic acids unlike inorganic acids are usually weak acids.
Organic acids are important in living organisms and play several roles such as in proteins or in lipids.
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how can carbon release the iron atoms from iron oxides
Answers
Iron atoms can be released from iron oxides as carbon has high affinity for oxygen compared to Iron
When two atoms come in contact with each other, interaction happens between the electrons and nucleus. This might result in bond formation between them. The resultant compound will be a molecule i.e., when two atoms’ bonds together, it would result in a molecule.
Iron oxide has 2 iron atoms and 3 oxygen atoms. When heat is applied, bonds between the molecules would break and result in the formation of atom.
Carbon has higher affinity for oxygen compared to Iron. Thus, carbon would interact with formed oxygen atoms and result in carbon dioxide. The iron atoms are free now as it does not have anything to react with.
Thus, carbon with high affinity for oxygen would help to separate iron from iron oxide.
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Object A is at a higher temperature than Object B. The objects have different masses and are made of different materials. Thermal energy transfers between the objects until
A. all of Object A's heat has transferred to Object B B. the objects have changed temperature by the same amount C. an equilibrium temperature is reached D. their specific heats are equal
Answers
Thermal energy transfers between the objects until an equilibrium temperature is reached.
What is thermal energy transfer?
Thermal energy transfer is the process by which heat transmitted from one body to another body, usually from a hotter body to the colder body.
Heat transfer process can occur in three different ways, and they include;
Heat transfer by conductionHeat transfer by radiationHeat transfer by convectionHeat transfer by conduction involves the actual movement of molecules from a hotter region to a colder region.
Heat transfer by radiation occurs through a space, from a hotter source to a colder region.
Heat transfer by convection occurs in a fluid, by the rising of hot molecules and sinking of the colder molecules.
Based on the law of conservation of energy, the heat transferred from a hotter body to a colder body will continue until both bodies reaches a state known as thermal equilibrium.
Thus, in thermal equilibrium, the final temperature of both bodies will be the same.
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