Answer:
Fe₂O3 +6 HCI - 2 FeCl3 + 3 H₂O
Explanation:
hope this helps.
The balanced equation obeys the law of conservation of mass. The balanced equation for the reaction of rust is Fe₂O₃ +6 HCI - 2 FeCl₃ + 3 H₂O. The correct option is C.
What is a balanced equation?A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal can be defined as the balanced chemical equation. The amount of products and reactants on both sides of the equation are equal.
The numbers which are added to balance a chemical equation are called the coefficients. They are added in front of the formulas.
The reaction of HCl with iron results in the formation of ferrous chloride (FeCl₂ or FeCl₃). When acid reacts with metal, it dissolves both the rust and the metal.
The balanced equation is:
Fe₂O₃ +6 HCI - 2 FeCl₃ + 3 H₂O
Thus the correct option is C.
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one chocolate chip used in making chocolate chip cookies has a mass of 0.324 g. how many chocolate chips are there in one mole of chocolate chips?
The chocolate chips that are in one mole of chocolate chips is 6.02214 × 10²³ chips.
What is a mole of a substance?The mole of a substance is defined as the amount of substance that is my are up of 6.02214 × 10²³ particles and this number is called the Avogadro's number.
This means that 1 mole of substance= 6.02214 × 10²³ of particles that makes up the substance.
The Avogadro's number is a constant used for all substances such as the chocolate chips.
That is to say, one mole of the chocolate chips has a mass of 0.324 g but contains 6.02214 × 10²³ particles of chocolate chips.
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The number of chocolate chips that are included inside one mole of chocolate chips is equal to 6.02214 ×10^23 chips.
A mole of a material is equal to how much exactly?The quantity of a material that may be made up of 6.02214 ×10^23 particles is referred to as a mole, and this number is known as Avogadro's number. The mole is the unit of measure used to describe this quantity.
This indicates that there are 6,02214×10^23 particles in one mole of the material, which implies that one mole of the substance is equal to one mole.
Avogadro's number is a constant that is applied to many different kinds of things, including chocolate chips.
In other words, one mole of chocolate chips has a mass of 0.324 g, yet it includes 6.02214 ×10^23 individual chocolate chip particles.
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what are two examples of a penumbra?!
Answer:
An example of the penumbra is the outer lighted area surrounding the shadow of the moon which is created during an eclipse. An outlying surrounding region; a periphery. (astronomy) A region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot.Explanation:
It is the lighter outer part of a shadow, and it is a factor that causes partial solar eclipses, penumbral lunar eclipses, and partial lunar eclipses. You can consider it a shadow within a shadow
which signs are typically posted in areas of active lab work?
The signs which are typically posted in areas of active lab work are safety equipment signs, Chemical storage signs, Signs prohibiting food and drink, and Personal protective equipment (PPE) signs.
Typically, active lab work is an area or lab where different samples of tissues, blood, urine, and other fluids are tested for diagnosis purposes and also for research.
A standard lab establishes some PPE signs and rules which must be followed by all the workers, patients, and staff.
In every laboratory, there are some general rules regarding the use of hazardous materials and equipment and for this purpose, safety signs are placed for precaution. Food and drinks are also prohibited in the lab as they may get contaminated.
These rules are being acquainted with the equipment and operation methods, not working alone in the lab, and wearing gloves and goggles, lab coats, and safety shoes for personal safety.
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What mass of Al(s) is required to make 100.0g of Al2O3(s) if the reaction has a percentage yield of
64.7%?
Answer:
81.8 grams of Al is required
How much more milk would a typical adult have to drink to get their RDA for calcium compared with the amount of milk needed to get their RDA for vitamin B-12
From the information given, the amount of milk that an adult would need to drink in order to get their RDA for calcium is 826.45cm³. While the amount of milk they would need to drink to get their RDA for B-12 is 266.67. See the explanation below.
What is RDA?Recommended Dietary Allowances (RDAs) are nutrient consumption levels determined by the Food and Nutrition Board to be adequate to fulfill the known nutritional needs of nearly all healthy people based on scientific evidence.
The calculation that justifies the above is given as follows:
For calcium, the RDA is derived as follows;
(500/605) * 1000
= 826.446280992
[tex]\approx[/tex] 826.45cm³
For Vitamin B-12, the RDA is derived as follows;
(500/4.5) x 2.4
= 266.666666667
[tex]\approx[/tex] 266.67cm³
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Full Question:
See attached image.
what mass of CaO, in grams, are formed when 10 grams of Ca reacts with 5 grams of O2
I was asking about this earlier
bai₂ since the precipitate is ba₃(po₄)₂, write the molecular equation for the precipitation reaction. if no reaction occurs, write nr after the reaction arrow. be sure to include the proper phases for all species within the reaction.
The equation of the precipitation reaction is given below:
BaI₂ (aq) + Na₃PO₄ (aq) ---> Ba₃(PO₄)₂ (s) + 3 NaI (aq)What are precipitation reactions?Precipitation reactions are reactions in which two solutions are mixed together to give a product that is insoluble in an aqueous medium known as a precipitate.
The precipitate obtained can be removed from the mixture through filtration using filter paper.
Precipitation reactions can either be a single displacement or double displacement reaction.
The equation of the reaction of the formation of the precipitate is Ba₃(PO₄)₂ is given below:
Barium iodide, BaI₂ reacts with sodium tetraoxophosphate (v), Na₃PO₄.
BaI₂ (aq) + Na₃PO₄ (aq) ---> Ba₃(PO₄)₂ (s) + 3 NaI (aq)
Therefore, the formation of a white precipitate shows that barium tetraoxophosphate (v) Ba₃(PO₄)₂ is insoluble in water.
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calculate the mass, in grams, of 2.50 mol of iron(iii) hydroxide.
The mass, in grams, of 2.50 mol of iron(iii) hydroxide is 225g
Mass is the measure of amount of matter in a substance or in a object
Here given data is mass iron(iii) hydroxide in mole = 2.50 mol and we have to find mass in gram = ?
The mass of one mole of Fe(OH)₂ = 89.85g/mol
So multiply by given mole by molar mass
2.50mol Fe(OH)₂ = 89.85g/mol Fe(OH)₂/1 mol Fe(OH)₂ = 225g Fe(OH)₂
mass, in grams, of 2.50 mol of iron(iii) hydroxide is 225g
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What is the equation for cellular respiration? (1 point) Responses glucose + oxygen + energy → carbon dioxide + water glucose + oxygen + energy → carbon dioxide + water carbon dioxide + water + energy → glucose + oxygen carbon dioxide + water + energy → glucose + oxygen glucose + oxygen → carbon dioxide + water + energy glucose + oxygen → carbon dioxide + water + energy carbon dioxide + energy → glucose + oxygen + water
The equation for cellular respiration is :
Glucose + oxygen ⇒ water + energy + carbon dioxide
HOW CELLULAR RESPIRATION WORKS:
The process through which living things receive the energy (ATP) required for metabolic activity is called cellular respiration.
It entails the breakdown of sugar molecules (with or without oxygen) to release carbon dioxide and produce energy in the form of ATP (CO2).
The reactants of cellular respiration, or the substances that are used for the beginning of the chemical process, are sugar (glucose) and oxygen. The products, or the results of cellular respiration, are water, carbon dioxide, and ATP energy. Thus it is the answer.
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What mass of KCl is needed to make 0.5 L of 4.0M solution? (K = 39 g; Cl = 35 g)
The mass of potassium chloride, KCl needed to make the solution is 148 g
How to determine the mass of KClWe'll begin by obtaining the mole of KCl. This can be obtained as follow:
Volume = 0.5 LMolarity = 4 MMole of KCl =?Molarity = mole / volume
Cross multiply
Mole = Molarity x Volume
Mole of KCl = 4 × 0.5
Mole of KCl = 2 moles
Finally, we shall determine the mass of KCl
Molar mass of KCl = 39 + 35 = 74 g/mol Mole of KCl = 2 molesMass of KCl =?Mole = mass / molar mass
Cross multiply
Mass = mole × molar mass
Mass of KCl = 2 × 74
Mass of KCl = 148 g
Thus, the mass of KCl is 148 g148 g
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In the formula for water (H₂O), what does the lack of a subscript after the O indicate?
O There is one oxygen atom in the compound.
O There are no oxygen atoms in the compound.
O
There are two oxygen atoms in the compound.
There is one molecule in the compound.
Answer:
There is one oxygen atom in the compound
what happpens when nitrogen fills its valence shell?
A. Three electrons are lost, creating N+3
B. Three electrons are gained, creating N-3
C. Three electrons are gained creating N+3
D. Three electrons are lost, creating N-3
for a neutralization reaction, would you expect the magnitude of q to increase, decrease, or stay the same if the concentration of only the acid were doubled? why? group of answer choices increase; if only the concentration of acid were doubled more neutralization reaction would occur because there is more acid than base stay the same; if only the concentration of acid were doubled no additional neutralization reaction would occur decrease; if only the concentration of acid were doubled less neutralization reaction would occur because there is less base than acid
For a neutralization reaction, more heat is evolved and Q is doubled.
When the concentration of the acid alone is twice in a neutralization process, the value of q (heat of neutralization) is increased twofold. A neutralizing reaction happens when an acid and a base are combined.A neutralization reaction is a reaction in which an acid undergoes a reaction with a base to form salt and water. Ionically, a neutralization reaction goes as follows; H^+(aq) + OH^-(aq) ------> H20(l).The heat of neutralization (Q) of the system depends on the concentration of the solutions. Since Q is dependent on concentration, if the concentration of any of the reactants is doubled, more heat is evolved hence Q is doubled.To learn more about neutralization reaction visit:
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When liquid nitrogen boils the following change occurs.
N₂(1)→ N₂(g)
The boiling point of nitrogen is very low even though the bond between the atoms in a
nitrogen molecule is very strong. Suggest an explanation.
The boiling point of nitrogen is so low because the nitrogen molecules are very small. The small size of the molecules means that they can escape the liquid state very easily.
What is nitrogen?
The chemical element with the atomic number 7 and the letter N is known as nitrogen. The lightest element in group 15 of the periodic table, often known as the pnictogens, nitrogen is a nonmetal. It is a typical element in the cosmos, believed to be eighth in the Milky Way and the Solar System in terms of overall abundance. Two of the element's atoms combine to generate N₂, an odourless and colourless diatomic gas, under standard pressure and temperature. The majority of the atmosphere on Earth is made up of N₂, making it the most prevalent uncombined element. All living things contain nitrogen, which is principally found in the amino acids that make up proteins, the nucleic acids that make up DNA and RNA, and the energy-transfer molecule adenosine triphosphate.
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pls help!! giving brainlist
what is the ksp of caf2 if its molar solubility is 2.04 x 10-4 m? group of answer choices 3.4 x 10-11 none of these 1.9 x 10-38 4.2 x 10-8
The ksp of caf2 if its molar solubility is 2.04 x 10-4 m is 3.40 x 10⁻¹¹.
Solubility is described because the maximum quantity of a substance with the purpose to dissolve in a given quantity of solvent at a distinct temperature. Solubility is a function property of a selected solute-solvent combination, and exclusive substances have greatly differing solubilities.
calculation:-
Caf₂ ----> Ca²⁺ + 2f⁻
s 2s
Ksp = [Ca²⁺] [f⁻]
ksp = [s][2s]²
= 4s³
Given
S = 2.04 x 10⁻⁴
⇒ Ksp = 4( 2.04 x 10⁻⁴)²
⇒ Ksp = 4 ( 8.49 x 10⁻¹²
⇒ Ksp = 3.40 x 10⁻¹¹
Solubility is the capability of a substance, the solute, to form an answer with some other substance, the solvent. Insolubility is the other belonging, the inability of the solute to shape this kind of solution.
Solubility refers to the best quantity of solute that may dissolve in a regarded amount of solvent at a given temperature. In a solvent, an answer is a homogeneous aggregate of one or greater solutes.
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Suppose a teaspoon of magnesium filings and a teaspoon of powdered sulfur are placed together in a metal beaker. Would this constitute a mixture or a pure substance? Suppose the magnesium filings and sulfur are heated so that they react with each other, forming magnesium sulfide. Would this still be a “mixture”? Why or why not?
1) When the powdered sulfur are placed together in a metal beaker, the both are examples of pure substances
2) When the both substances are heated such that magnesium sulfide is formed, it is no more a mixture but a compound.
What is a mixture?The term mixture has to do with a combination of two or more substances that are not chemically combined together. Let us note that a mixture would always retain the properties of the individual substances that do make up the mixture as it were.
When the components of a mixture react chemically then it is no more a mixture because a chemicals bond now exists between the substances and they can no more be separated by means of a physical method.
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What types of electrons penetrates most toward the nucleus and therefore has the greatest shielding effect?
The electron present in s subshell will show most penetration towards the nucleus
The extent to which an electron can come closer to the nucleus or the extent to which an electron can experience nuclear force is known as penetration. The ability of electron to penetrate into different subshell and shell is known as its penetration power.
The order of penetration is as follow: s>p>d>f.
Shielding effect is also known as screening effect. It is the decrease in the nuclear force experienced by the valence electron due to increase in atomic number. In the other word we can say that penetration is opposite to shielding effect.
The order of the shielding effect on the outer valence electron is as follow: s>p>d>f.
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23. The cell has a
high
low
concentration of water
compared to the solution. I
70% Water
30% Solute
Classify the following as a
heterogeneous mixture
(suspension), homogeneous mixture
(solution), or a colloid:
s'mores
A. heterogeneous mixture (suspension)
B. colloid
C. homogeneous mixture (solution)
Answer: Heterogeneous mixture (suspension)
Explanation: There is a pattern of the items making them different which is heterogeneous.
when a 7.00 g sample of rbbr is dissolved in water in a calorimeter that has a total heat capacity of 2.65 kj⋅k−1, the temperature decreases by 0.350 k. calculate the molar heat of solution of rbbr.
The molar heat of solution is -23.2 kJ/mol.
What is the molar heat?The molar heat is the heat that is evolved when one mole of the rubidium bromide is dissolved in water under standard conditions. We first have to find number of moles of the solution. When we dissolve the solid in solution heat is absorbed or evolved as seen above.
Number of moles = 7.00 g/165 g/mol = 0.04 moles
Given that;
H = cθ
H = heat absorbed or evolved
θ = temperature change
c = heat capacity
H = -(2.65 * 0.350)/0.04
H = -23.2 kJ/mol
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PLS HELP
This diagram is a model of the boron atom.
How many electrons, protons, and neutrons are in this atom, and how many additional electrons are needed to completely fill the outer shell of this atom?
Responses
3 electrons, 6 protons, 5 neutrons; 5 additional electrons are needed to completely fill the outer shell of this atom
5 electrons, 6 protons, 5 neutrons; 3 additional electrons are needed to completely fill the outer shell of this atom
6 electrons, 5 protons, 5 neutrons; 2 additional electrons are needed to completely fill the outer shell of this atom
5 electrons, 5 protons, 6 neutrons; 5 additional electrons are needed to completely fill the outer shell of this atom
Answer:
it's c
Explanation:
I got a 100 on test5tttttttttttttttt
a student mixed 20.0 cm3 of water with 20.0 cm3 of ethanol and found the resultant volume to be 38.7 cm3. calculate the density of the resultant mixture. (note: density of water is 1.00 g cm–3 and density of ethanol is 0.789 g cm–3.)
The density of the resultant mixture is 0.925 g/cm³.
What is the mass of each component of the mixture?
The mass of each component of the mixture is calculated as follows;
m = ρV
where;
ρ is densityV is volumemass of water = 20 cm³ x 1 g/cm³ = 20 g
mass of ethanol = 20 cm³ x 0.789 g/cm³ = 15.78 g
Total mass of the mixture = 20 g + 15.78 g = 35.78 g
The density of the mixture is calculated as follows;
Density of the mixture = total mass / total volume
Density of the mixture = (35.78 g) / (38.7 cm³) = 0.925 g/cm³
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acetonitrile (ch3cn)(ch3cn) is a polar organic solvent that dissolves a wide range of solutes, including many salts. the density of a 1.70 mm librlibr solution in acetonitrile is 0.824 g/cm3g/cm3 . part a calculate the concentration of the solution in molality.
This formula is used to determine a solution's molality:
Molality is defined as the product of the mass of the solvent and the number of moles of the solute.
Solute concentration is 1.80 M.
Thus, 1.80 moles of solute are contained in one litre.
Mass of solvent equals mass of solution minus mass of solute.
Solution mass equals volume times density.
1 L is equal to 1000 cm3 of solution.
mass of solution is 1000 minus 0.824.
824 g is the solution's mass.
Number of moles times molar mass equals the solute's mass.
86.84 g/mol is the solute's molar mass.
Solute mass = 1.80 86.84
156.3 g is the solute's mass.
Solvent mass equals 824 minus 156.3.
Solvent mass is 667.7 g, or 0.6677 kg.
Solution's molality is equal to 1.80/0.6677.
The solution's molality is 2.70 mol/kg.
A solution's molality is the number of moles of solute per kilogram or per kilogram of solvent in the solution. As opposed to the definition of molarity, which is based on a certain volume of solution, this is the opposite. Molality is measured in chemistry using the mol/kg unit.
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A property of acids is that they react with metals. If you placed a cut lemon and a raw egg on two spots on bare metal, which of the following would you observe
A. Only the egg would react.
B. Only the lemon would react.
C. Both the lemon and the egg would react.
D. Niether the lemon nor the egg would react.
Answer:
B
Explanation:
lemon is acidic so that's why it react with metals
What are the main group elements
Answer:
In chemistry and atomic physics, the main group is the group of elements whose lightest members are represented by helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, and fluorine as arranged in the periodic table of the elements. The main group includes the elements in groups 1 and 2, and groups 13 to 18.
chose one part of the earth system water-air,rock or life and describe how other parts might be effected if the first part were removed
One part of the earth system water-air, rock or life and describe how other parts might be effected if the first part were removed then the biosphere which contain all planet living organism and in the atmosphere which contain all planet air
Earth system is the earth interacting with physical, chemical as well as biological and the sphere are so closely connected that a change in one sphere often result in change one or more of other sphere and events that occur in one component eventually affect the other and the components are geosphere is the ability to live in certain places whereas hydrosphere is the ability to use water whereas atmosphere impacting the temperature and ability to breath and also the water-air, rock in that one is missing so it will definitely affect the other
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2. you observed the spectral lines for a variety of different elements. what is happening within an atom that causes it to emit light in specific lines in a spectrum?
When we observe the spectral lines for a variety of different elements within an atom we see that transition of electrons causes it to emit light in specific spectral lines in a spectrum.
What is transition of electrons?
In an atom, the jump of an electron from one energy phase to another energy phase is called transition of electrons.
Typically, an electron continue to change its quantized energy levels from one to another within few nanoseconds by absorbing UV radiations and that is why the spectrum or spectral lines appear to be discontinuous.
In general, transition of electrons mostly occurs in s, p and n energy orbitals.
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the classic red wine of bordeaux cannot be made from which grape?
Answer:
Pinot Noir
Explanation:
Cabernet Sauvignon, Merlot, Cabernet Franc, Petit Verdot, Malbec, and on occasion Carménère are the six Bordeaux varietals. The classic red wine of bordeaux cannot be made from pinot noir.
What grape is Bordeaux wine ?Cabernet Sauvignon, Merlot, Cabernet Franc, Petit Verdot, Malbec, and on occasion Carménère are the six Bordeaux varietals. These grapes, which each contribute distinctive qualities to their wines, are combined in various ways to create Bordeaux blends.
A variety of grapes are often used to make red Bordeaux. Cabernet Sauvignon, Cabernet Franc, Merlot, Petit Verdot, Malbec, and Carménère are permitted varietals. The fifth generation Bordeaux wine Château Clerc Milon is one of the few remaining producers of Carménère in today's world.
Cabernet Sauvignon, Merlot, and Cabernet Franc make up the majority of a red Bordeaux mix, with minor amounts of Malbec and Petit Verdo.
Thus, The classic red wine of bordeaux cannot be made from pinot noir.
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Another student performs this lab, following a similar procedure to the one you used. However, the student stops adding ice when their water cools down to only 15°C, instead of adding more ice until the water reaches a temperature close to 0°C. Will this version of the procedure change the final calculated value of AH? Justify your response by indicating what measurements would have change
Because the student stopped adding ice when the water cooled down to 15°C, the final calculated value of AH would be different. This is because the heat of fusion of water is not a constant, but rather it decreases as the temperature decreases. Thus, the heat of fusion would be less at 15°C than it would be at 0°C.
What is temperature?
Temperature is a numerical expression of how hot a substance or radiation is.
There are three different types of temperature scales: those that are defined by the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body, like the SI scale; those that rely only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are not defined by theoretical principles but rather by useful empirical properties of particulate matter.
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