what is rusting of iron?
Answers
Answer:
Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Unlike rust, which can flake off the surface of iron and steel objects, the layer of aluminium oxide does not flake off.
Explanation:
Iron = reacts with oxygen and water to form hydrated iron oxide, we then start to see rust.
This prevents the metal from coming in any contact with air. Hope this helps :)
Related Questions
Lily replicates an experiment that found that the number of calories in a particular food is 50 kcal. She obtained data from
five trials: 50 kcal 72 kcal, 50 kcal, 12 kcal, and 50 kcal. Which best desribes her data results? A. accurate B. incorrect C. invalid D. precise
Answers
Answer:
invalid
Explanation:
Just imagine doing this experiment MULTIPLE TIMES and one of the trials you get 72 Kcal while in another u get 12kcal. It doesn't make sense. Somewhere in the experiment she went wrong. So its invalid
explain why nitrogen gas diffuse faster than chlorine gas
Answers
Answer:
The heavier the molecules, the slower they move - the lighter the molecules, the faster they move. Nitrogen molecules weigh about 28 units. Chlorine molecules weigh 71 units. So we would expect nitrogen to diffuse more quickly than chlorine.
Answer:
Nitrogen weights 28 units and chlorine is 71 units . In that case nitrogen will diffuse faster
student does an experiment to determine the molar solubility of lead chloride. He constructs a voltaic cell at 298 K consisting of a 0.889 M lead nitrate solution and a lead electrode in the cathode compartment, and a saturated lead chloride solution and a lead electrode in the anode compartment.
If the cell potential is measured to be 5.04×10-2 V, what is the value of Ksp for lead chloride at 298 K based on this experiment?
Ksp for PbCl2 =
Answers
The value of Ksp for lead chloride (PbCl2) at 298 K based on the given experiment, we can use the Nernst equation. The Nernst equation relates the cell potential to the (K) for the redox reaction occurring in the cell.
The Nernst equation is given by:
Ecell = E°cell - (RT/nF) * ln(Q),
where E°cell is the standard cell potential, R is the gas constant (8.314 J/(mol·K)), T is the temperature in Kelvin, n is the number of electrons transferred in the redox reaction, F is Faraday's constant (96,485 C/mol), and Q is the reaction quotient.
In this case, the redox reaction can be represented as:
\(PbCl_2\)(s) ⇌ \(Pb^2^+\)(aq) + \(2Cl^-\)(aq).
The reaction quotient (Q) for this equation is given by:
Q = \([Pb^2^+][Cl^-]^2\),
where\([Pb^2^+]\) represents the concentration of \(Pb^2^+\) ions and \([Cl^-]\) represents the concentration of \(Cl^-\)ions.
Since the lead nitrate solution is 0.889 M, we can assume that the concentration of \([Pb^2^+]\) ions is 0.889 M in the cathode compartment. In the anode compartment, the solution is saturated with lead chloride, meaning the concentration of \([Pb^2^+]\) and \(Cl^-\) ions are equal.
Now, let's substitute the values into the Nernst equation:
5.04×10-2 V = E°cell - (0.0257 V) * \(ln([Pb^2^+][Cl^-]^2)\).
Since we are interested in the value of Ksp for PbCl2, which represents the equilibrium constant for the dissolution of the solid \(PbCl_2\), we can set the cell potential (Ecell) to zero when equilibrium is reached. Therefore:
0 = E°cell - (0.0257 V) * \(ln([Pb^2^+][Cl^-]^2)\).
Rearranging the equation:
E°cell = (0.0257 V) * \(ln([Pb^2^+][Cl^-]^2)\)
Now we can solve for Ksp by substituting the known values:
Ksp = \([Pb^2^+][Cl^-]^2\) = e^(E°cell / (0.0257 V)).
Calculating the numerical value:
Ksp = \([Pb^2^+][Cl^-]^2\) = e^(0.0257 V / (0.0257 V)).
Ksp = \([Pb^2^+][Cl^-]^2\) = e^1 = 2.71828.
Therefore, the value of Ksp for lead chloride \((PbCl_2)\) at 298 K, based on this experiment, is approximately 2.71828.
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Why is modern periodic table better than Mendeleev's periodic table?
Answers
Answer:
because mariah carey wrote it
Explanation:
she also made a song out of it!
For every 6 mols of H2 how many mols of h20 will be produced?
For every 2 mols of H2 how many mols of h20 will be produced?
For every 5.67 mols of H2 how many mols of h20 will be produced?
Answers
The moles would be 12 moles, 4 moles and 11.34 moles
How to solve for the molesWhen hydrogen gas (H2) reacts with oxygen gas (O2) to produce water (H2O), the balanced chemical equation is:
2H2 + O2 -> 2H2O
So,
For every 6 moles of H2, 12 moles of H2O will be produced
For every 2 moles of H2, 4 moles of H2O will be produced
For every 5.67 moles of H2, 11.34 moles of H2O will be produced.
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How many moles are equal to 1.20 x 1024 atoms of sulfur?
Answers
Answer:
A mole is the quantity of a substance that is equal to Avogadro's constant. The 1.993 moles contain atoms of sulfur.
Mole :
It is the amount of substance that contains as many elementary entities as in 12 g of Carbon-12. It is equal to the atoms, molecules, or ions.
As mentioned above,
1 mole =
Number of mole formula,
Hence it can conclude that the 1.993 moles contain atoms of sulfur.
the most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.
Answers
The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon is True.
What is Rayon?A natural source of regenerated cellulose, such as wood and other associated agricultural products, is used to create rayon, a semi-synthetic material. Its molecules resemble those of cellulose. Viscose is another name for it. Viscose fibres and films come in a wide variety of types and grades. Some mimic the appearance and feel of organic materials including silk, wool, cotton, and linen. Artificial silk is a common name for the materials that resemble silk.
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Complete Question
The most common type of regenerated fiber, which is derived from cellulose and is mostly plant in origin, is rayon.
True
False
4) How many moles of O2 are produced with 42.0 moles of H2O?
Answers
Answer:
1.2353 mol
Explanation:
QUESTIONS
Balance the equation and state the type of reaction.
Answers
Combustion and displacement reaction are the types of given chemical reaction. In a chemical reaction, the atoms that make up the reactants.
What is chemical reaction?Chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products).
Chemical elements or chemical compounds make up substances. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.
C\(_4\)H\(_{10}\) + O\(_2\) → CO\(_2\) + H\(_2\)O
oxygen is not balanced so balanced it
2C\(_4\)H\(_{10}\) + 13O\(_2\) → 8CO\(_2\) + 10H\(_2\)O, this is a combustion reaction.
Fe + CuNO\(_3\) →Fe(NO\(_3\))\(_2\)+Cu
The number of nitrogen atom on left side is 1 while on product side is 2
Fe + 2CuNO\(_3\) →Fe(NO\(_3\))\(_2\)+2Cu
This a displacement reaction.
Therefore, combustion and displacement reaction are the types of given chemical reaction.
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A solvent used to separate chloroplast pigments has 2 polar groups. A pigment that ran exactly with the solvent front would.
Answers
A pigment that ran exactly with the solvent front would have no polarity and be the most non-polar of the pigments.
The process of chromatography is used to separate chloroplast pigments. It is a laboratory technique that involves separating a mixture into its individual components. The mixture is dissolved in a mobile phase, which is usually a liquid or gas, and is then passed through a stationary phase. The solvent used to separate chloroplast pigments has two polar groups. This means that it is polar in nature and can dissolve other polar substances.
As the solvent moves through the stationary phase, the individual pigments in the mixture are separated based on their polarity. The pigment that runs exactly with the solvent front would have no polarity and would be the most non-polar of the pigments. This is because it has the least attraction to the polar solvent. The other pigments, which are more polar, would be retained on the stationary phase and would not move as far as the non-polar pigment.
Therefore, the more polar the pigment, the less it will move with the solvent front.
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So i need 3 observations 2 inferences and 1 prediction.
I know i could do this but im lazy.
Answers
Habitat degradation: 25%, Exploitation: 50%, Invasive species and disease: 25%, Pollution: 25%, Climate change: 50%, Birds: 25%, Reptiles and amphibians: 25%, Mammals: 25% and Fish: 25%
What are the factors causing decline in biodiversity?Biodiversity is being threatened by many impacts from human activities. These include climate change, habitat destruction, over-exploitation of resources, pollution, and introduction of invasive species.
Climate change affects biodiversity by changing the physical and chemical environment, altering weather patterns, and increasing the frequency and intensity of extreme weather events. This can lead to a decrease in species diversity, as some species may not be able to survive in the new environment. Habitat destruction is another major factor in biodiversity loss, as it removes habitats that are necessary for species to survive and reproduce.
Over-exploitation of resources can lead to over-harvesting of animals and plants, removing an important source of food or shelter. Pollution can be toxic to species and can also disrupt the food chain. Finally, the introduction of invasive species can out-compete native species, leading to their decline.
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List and explain four properties of plastics. Give one use of plastics linked to each other of these properties
Answers
Answer:
1.) plastics are poor conductors of heat and electricity
2.) plastics are non reactive metals they are not attacked by chemicals
3.) plastics are lightweight strong and durable
4.) plastics can be moulded and dyed easily in many colours like orange, pink ,sky blue , red, green, and e.t.c
the four uses of plastics are:
1.) bakelite is used to make electric switches insulating casings and handle of cookware and tools
2.) melamine is heat resistant and is used to make kitchenware , floor tiles and special suits for firefighters
3.) Teflon is used as a non stick coating on cookware as both water and oil do not stick to it
4.) many plastics are waterproof and therefore
they are used to make Water bottles and waterproof containers
Explanation:
Search it up bro :')
The four properties of plastics are malleability, longevity, cheapness, and poor conductivity.
Plastics are generally very malleable and can be molded into different shapes very easily. Different types of plastics have different melting points, which enables them to be shaped into different shapes and make objects.
Plastics are generally very durable and have a long shelf life. That is the reason why plastics are used to make things that go through a lot of wear and tear. A negative aspect of this is that plastics, when exposed to natural processes of degradation, do not break down easily and harm the environment.
Plastics are usually cheap and can be obtained at a very less price. This helps people afford goods made out of plastic and also reduces the production cost of the goods.
Plastics are generally very poor conductors of heat and electricity. This means that they do not conduct heat and electricity very well, which is why they are used as insulators and wire coverings.
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What is the molar concentration a a 12 % sodium chloride solution (MW 58.5)
Answers
The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.
To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.
First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.
In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.
To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.
We can start by calculating the number of moles of sodium chloride in 12 grams:
Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride
Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles
Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:
Volume of solution = mass of solution / density
Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L
Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:
Molar concentration = moles of solute / volume of solution
Molar concentration = 0.205 moles / 0.1 L = 2.05 M
Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.
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I was wondering if I have the right number of atoms
Answers
First, let's visualize the structure of 1,1,4-trifluorohept-2-yne. This indicates that there is fluor in carbon 1 twice and in carbon 4, there is a triple bond in carbon 2 because of the "2-yne" (yne is telling us that is a triple bond) and the principal chain has seven carbons (hept). Remember that carbon is bonded fourth times:
You can see that we have 7 carbon atoms, 9 hydrogen atoms, and 3 fluorine atoms.
The reaction of perchloric acid (HCIO4) with lithium hydroxide (KOH) is
described by the equation
HCIO4 + KOH → KCIO4 + H20
Suppose 100 mL of perchloric acid is neutralized by exactly 50,0 mL of 1.0 M
of Potassium hydroxide. What is the concentration of the perchloric acid?
Answers
Answer:
HCIO4+KOH=KCIO4+H2O IS H2OHYFR
Help with atoms WILL MARK BRAINLIEST
Answers
Answer:
C 1:1
Explanation:
Hydrogen loses an electron to becone +1 which is a cation and flourine gains that electron to have a full outer shell on the 2p subshell to become -1 and is an anion so the ratio is 1:1.
two types of fine chemical
Answers
Answer:
Flavors and fragrances
which of the following statements correctly describe the bohr model of the hydrogen atom? select all that apply. multiple select question. the atom is in an excited state when the electron is in the orbit closest to the nucleus. the atom is in its lowest energy state when the electron is in the orbit closest to the nucleus. the electron can move to a higher energy state by absorbing a photon with energy equal to that of the new energy state. each energy state of the hydrogen atom is associated with a fixed circular orbit of the electron around the nucleus. only certain energy levels are allowed within the hydrogen atom.
Answers
These next statements are true because of the Bohr model of the hydrogen atom:
The atom is in its lowest energy state when the electron is in the orbit closest to the nucleus.Only certain energy levels are allowed within the hydrogen atom.The electron can move to a higher energy state by absorbing a photon with energy equal to that of the new energy state.Each energy state of the hydrogen atom is associated with a fixed circular orbit of the electron around the nucleus.These statements are true because of the Bohr model of the hydrogen atom. The Bohr model describes the way the electrons move in a hydrogen atom. This model shows that electrons are arranged in shells around the nucleus. Each shell corresponds to a specific energy level, and each energy level has a fixed circular orbit of the electron around the nucleus. When the electron is in the orbit closest to the nucleus, it has its lowest energy state.
When the electron absorbs a photon with energy equal to the new energy state, it moves to a higher energy state. Only certain energy levels are allowed within the hydrogen atom because electrons can only exist in specific energy levels.
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What is the coordination number of the metal atom in the [Fe(NCS)(H 2 O) 5 ] 2+ complex?
Answers
Answer:
6
Explanation:
The coordination number of the metal atom in the [Fe(NCS)(H2O)5]2+ complex is 6.
This means that there are six surrounding atoms or molecules (five water molecules and one NCS ligand) directly bonded to the central iron (Fe) atom in the complex.
Hope it helps!!
The coordination number of the metal atom in the [Fe(NCS)(H2O)5]2+ complex is six.
Coordination number is the total number of neighbors (atoms or ions) that a central atom has in a coordination compound or a complex. Coordination compounds are chemical species that have a central metal ion bonded to a set of molecules or ions, known as ligands.
These ligands are capable of donating a pair of electrons to the central metal ion and thus, form coordinate covalent bonds.Coordination number of metal ion in [Fe(NCS)(H2O)5]2+ complex:In the given coordination compound, Fe(II) is the central metal ion that is coordinated with five water molecules and one NCS– anion ligand.
Thus, the total number of coordinate covalent bonds formed between Fe(II) and its ligands is 6.Therefore, the coordination number of the metal atom in the [Fe(NCS)(H2O)5]2+ complex is six.
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what is the formula for iron ii phosphate when dissociation
Answers
Answer: Fe3(PO4)2
Explanation:
If this helps give me brainliest please
1 Calculate the atom economy to form copper(II)oxide from
CUCO3 -> CUO + CO₂
copper(II) carbonate
Answers
Answer:
thermal decomposition
Identify which is the result of a physical rather than
a chemical change?
Answers
Answer:
b
Explanation:
in the group the reactivity of metals increases? give example
Answers
Answer:
As sodium and potassium both are alkali metals that belong to Group IA of the periodic table. They have one valence electron in their valence shell. As we move from top to bottom, the reactivity of metallic elements of Group IA increases.
What do the elements in group 18 have in common?
Answers
Answer: They are all odorless, colorless, monatomic gases with very low chemical reactivity.
Explanation: Plz give brainliest
Which option is a type of kinetic energy? (1 point)
o thermal energy
o activation energy
O potential energy
+
O bond energy
Answers
Answer:
it's thermal energy
Explanation:
There are five types of kinetic energy: radiant, thermal, sound, electrical and mechanical.
#carry on learning
Hope it helps
In this exercise we have to use the knowledge of kinetic energy and we can also describe it as a thermal energy.
What is Kinetic Energy?Kinetic energy is a type of energy that is related to the movement of bodies. The result of kinetic energy is intrinsically linked to the value of the object's mass and its speed of movement.
What are the types of kinetic energy?Kinetic energy does not depend exclusively on the speed of a body but also on its mass. Any type of body in motion is endowed with this type of energy: translation, rotation, vibration and others.
With these definitions we can write that it will be the same as saying that kinetic energy can be transformed into thermal energy.
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The gas pressure inside a container decreases when which of the following happens? the number of molecules is increased and the temperature is increased the number of gas molecules is decreased the temperature is increased the number of gas molecules is increased
Answers
what causes the common cold?
Answers
Answer: Colds are caused by viruses and are easy to treat. They are usually caused by germs too.
Explanation:
Answer:
Answer: Colds are caused by viruses and are easy to treat. They are usually caused by germs too.v
Explanation:
What is true when a reaction has reached equilibrium? The reaction is faster in the forward direction. The reaction is faster in the reverse direction. The reaction has stopped. The reaction rate is equal in both directions.
Answers
Answer:
The reaction rate is equal in both directions.
Explanation:
Equilibrium means equal.. so... you get the point.
Answer: the reaction rate is equal in both directions is the answer
Explanation:
hope this helps
The boiling point of water at a pressure of 25 atm is 223oc. Compare the theoretical efficiencies of a steam engine operating between 20oc and the boiling point of water at 1 atm and at 25 atm
Answers
To compare the theoretical efficiencies of a steam engine operating between 20°C and the boiling point of water at different pressures, we need to calculate the Carnot efficiency for each case.
The Carnot efficiency is given by the formula:
Efficiency = 1 - (Tc/Th)
where Tc is the temperature of the cold reservoir and Th is the temperature of the hot reservoir.
Case 1: Boiling point of water at 1 atm
The boiling point of water at 1 atm is 100°C.
Efficiency = 1 - (20/100) = 0.8 or 80%
Case 2: Boiling point of water at 25 atm
The boiling point of water at 25 atm is given as 223°C.
Efficiency = 1 - (20/223) ≈ 0.910 or 91.0%
Comparing the efficiencies, we can see that the theoretical efficiency of the steam engine operating between 20°C and the boiling point of water at 25 atm is higher (91.0%) than that between 20°C and the boiling point of water at 1 atm (80%). This is because a higher temperature difference between the hot and cold reservoirs leads to a higher Carnot efficiency.
It's important to note that these calculations represent the idealized theoretical efficiencies based on the Carnot cycle and do not take into account real-world losses and inefficiencies in steam engine systems.
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A cool ranch doritos loco™ taco from taco bell is burned in a bomb calorimeter with a heat capacity of 31.2/°C. If the change in temperature was 22.8°C. How many food calories are in the taco?
Answers
The answer is- 142.27 food calories are in the taco.
Heat capacity-The amount of energy needed to increase the temperature of a substance by one degree Celsius.
How heat released or gained is related to heat capacity?
The heat of a system when the temperature is raised is calculated as:\(q = m* C*\)Δ\(T\)
Where m is the mass of substance.
C is the heat capacity
and Δ\(T\) is the change in temperature.
Now, for the given taco bell, the heat capacity of the calorimeter = 31.2/°C. It means that for 1 degree rise of temperature of calorimeter, 31.2 kJ of heat is needed.Therefore, if the change in temperature is 22.8 °C, the heat that come from taco is-\(Heat\ = (22.8 ^{0}\ C) * (31.2 kJ/ ^{0}\ C) = 711.36\ kJ\)
Now, the above heat is converted into food calories as-1 kJ = 0.2 food calories
Thus, the food calories in the taco are-
\(Food\ Calories\ in\ taco = (711.36\ kJ) * (0.2 Food\ calories/ kJ) = 142.27\ calories\)
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