Corrosion is the process of chemical or electrochemical attack of materials by their external environment.
The tendency/resistance of different metals to corrosion largely depends on the composition of the metal. Iron and steel corrode in the presence of oxygen due to oxidation, while some metals such as chromium, nickel and molybdenum provide a protective layer of oxide film on the surface of the metal which is then resistant to corrosion. Other metals such as aluminum and zinc form sacrificial oxide layers which corrode and protect the metal from becoming completely damaged.
List all the possible types of bonding for oxygen
Two covalent bonds are formed by oxygen to complete their octet.
What are covalent bonds?An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or sharing pairs are the names given to these electron pairs. Covalent bonding is the stable equilibrium of the attractive and repulsive forces between atoms when they share electrons.
What is an octet?In chemistry, an octet is an arrangement of eight electrons in the outer electron shell of a noble gas atom. The relative inertness of noble gases and the chemical behaviour of several other elements are attributed to this structure.
What is oxygen?The chemical element oxygen has an atomic number of 8. (it has eight protons in its nucleus). At normal temperatures and pressures, oxygen transforms into the chemical compound (O2) of two atoms, which is a colourless gas.
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Urgent will give brainlist
Answer:
i think that it is C. both
Explanation:
How many moles of silane gas (SiH4) are present in 8.68 mL
measured at 18 0C and 1.50 atm?
Answer:
5.45*10⁻⁴ moles of silane gas (SiH₄) are present in 8.68 mL measured at 18°C and 1.50 atm.
Explanation:
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P * V = n * R * T
In this case:
P= 1.5 atmV= 8.68 mL= 0.00868 L (being 1000 mL= 1 L)n= ?R= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= 18 C= 291 K (being 0 C= 273 K)Replacing:
1.5 atm* 0.00868 L= n* 0.082[tex]\frac{atm*L}{mol*K}[/tex] *291 K
Solving:
[tex]n=\frac{1.5 atm*0.00868 L}{0.082 \frac{atm*L}{mol*K}*291 K}[/tex]
n= 5.45*10⁻⁴ moles
5.45*10⁻⁴ moles of silane gas (SiH₄) are present in 8.68 mL measured at 18°C and 1.50 atm.
In the molecule C2H4 the valence orbitals of the carbon atoms are assumed to be?
a) dsp hybridized
b) not hybridized
c) sp hybridized
d) sp^3 hybridized
e) sp^2 hybridized
In the molecule C2H4, valence orbitals of the carbon atoms are assumed to be e) sp^2 hybridized.
What is valence orbitals?The set of orbitals that can energetically accept electrons to create chemical bonds is known as the valence shell. The ns and np orbitals in the outermost electron shell make form the valence shell for main-group elements.
The outside electrons engaged in bonding are called valence electrons. A particular atom can have 0 to 7 valance electrons since valance electrons can only exist in the s and p orbitals. Noble gases are atoms that have no valence electrons and dislike forming bonds.
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Name the following compound
(ii) CH3COOCH2CH2CH3
Answer:
PROPYL ETHANOATE (OR PROPYL ACETATE)
Explanation:
1st step: Identify the functional group of the compound.
COO is present, hence it is an ester.
2nd step: Split up the compound into CH3COOH and CH3CH2CH2OH.
Comes from ethanoic acid and propanol
3rd step: Join the names of the alcohol and the carboxylic acid together.
Hence, propyl ethanoate.
Draw the stracture of 2-bromo-4-chloro-3, 3-dimethylhex-1-ene
answer :
this is the structure if you want it
2. HBIO3 name this acid.
Answer:
Hydroxy(oxo)bismuthine oxide
A chemist is studying the composition of a sample of ocean water. He gently heats the sample to evaporate the water, leaving him with the solid substances that had been dissolved in the sample. Next, he performs a series of procedures to separate the solid substances from each other. Finally, he measures how much of each solid he has obtained. What substance would he probably have the most of
The substance that he will have the most will be sodium chloride.
More than 70% of the surface of the Earth is covered by seawater, the liquid that makes up the oceans and seas. 96.5 percent of seawater is made up of pure water, 2.5 percent salt, and minor amounts of dissolved inorganic and organic compounds, particles, and a few atmospheric gases.
When a chemist analyzes the composition of a sample and heats it to cause the water to evaporate, he is left with the solid substances that had been dissolved in the sample. Sodium chloride is the most significant salt that is created by ocean water. He next goes through a series of steps to separate the solid materials from one another. The highest substance found in ocean water, according to his measurements, is salt, specifically sodium chloride.
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A 716.4g sample of iron is subjected to a temperature change of -33.47°C while releasing 996.6 joules of heat. What is the specific heat capacity of iron?
Answer choices:
29.8 J/g°C
0.04 J/g°C
-0.04 J/g°C
1.39 J/g°C
Answer:
Specific heat capacity of iron (c) = -0.04 J/g°C
Explanation:
Given:
Mass of sample of iron M = 716.4 gram
Change in temperature Δt = -33.47°C
Heat energy Q = 996.6 joules
Find:
Specific heat capacity of iron (c)
Computation:
We know that
Q = McΔt
So,
c = Q / M[Δt]
Specific heat capacity of iron (c) = 996.6 / (716.4)(-33.47)
Specific heat capacity of iron (c) = 996.6 / -23,977.908
Specific heat capacity of iron (c) = -0.0415
Specific heat capacity of iron (c) = -0.04 J/g°C
How many moles are in 3 x 10^23 atoms of gold
Answer:
0.50 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
We have
[tex]n = \frac{3 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3}{6.02} \\ = 0.49833...[/tex]
We have the final answer as
0.50 molesHope this helps you
State two reasons why a person might choose a pneumatic
system rather than a hydraulic system.
Answer:
pneumatics are cleaner the system uses no return lines and gases are exhausted to the atmosphere.efficient and reliableWhy does the drink in the regular cup warm
up?
The drink in the regular cup warms up because
Answer:
Energy transfer between the particles in solids, liquids, and gases can explain how warm matter outside a cup can cause a cold liquid inside the cup to warm up.
Explanation:
Answer:
The drink in the regular cup warms up.
Explanation:
The reason why it warms up is because the cup is colder than room temperature and melts another reason why the drink in the regular cup warms up is because when we breathe out hot air is coming out soo that also makes the drink warmer.
4 P (s) + 5 O2 (g) -> P4O10 (s)
If 0.554 mol of phosphorus burns, what mass of oxygen is used?
MassMass of oxygen used on combustion of 0.554 mol of phosphorus is 957.12 g.
What is combustion?Combustion is the name given to the chemical reaction in which a material combines with oxygen to produce heat. A substance is said to be combustible if it can burn. Another name for it is fuel. Fuel can be either solid, liquid, or gaseous.
Since, 4 moles of phosphorus burns in the presence of 5 moles of oxygen
Therefore, 0.554 moles of phosphorus will burn in presence of 54×0.554=29.91 moles of oxygen.
Molar mass of oxygen is 32 g/mol.
Hence, mass of oxygen used can be calculated by:
Mass of oxygen used under given reaction conditions =32×29.91⇒957.12 g.
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Mass of oxygen used on combustion of 0.554 mol of phosphorus is 957.12 g. Oxygen has an atomic mass of 15.9994. ss.
What is combustion?Combustion is the name given to the chemical reaction in which a material combines with oxygen to produce heat. Another name for it is fuel. Fuel can be either solid, liquid, or gaseous.
What is combustion of phosphorus?4 moles of phosphorus burns in the presence of 5 moles of oxygen 0.554 moles of phosphorus will burn in presence of 54×0.554=29.91 moles of oxygen. Molar mass of oxygen is 32 g/mol. Mass of oxygen used under given reaction conditions 32×29.9 = 957.12 g.
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Which of the following properties can be used to describe both the particle model of light and the wave model of light
An absolutely interesting occurrence is light. Despite the fact that it is well recognized that light is an electromagnetic, it is frequently more practical to characterise or characterize light in other ways than only as a wave.
For instance, light is frequently depicted as anything other than a wave in spectroscopy and fundamental physics.
Similar to how we replicate oceans moving through water, the Wave Model illustrates how light propagates. Colors can be explained using the Wave Model by including information about wavelength.
The Light Wave Model. Similar to how we simulate ocean waves moving across water, the Wave Model illustrates how light propagates. We can explain qualities of light by imagining it to be an oscillating wave.
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If nitrogen at 130 kPa is allowed to expand at constant temperature until its pressure is 145.5 kPa, how much larger will the volume become?
Answer:
0.89 times
Explanation:
Let the initial volume of the tank be V.
Finally, we shall determine how much larger the final volume of the gas will be. This is illustrated below:
Initial pressure (P₁) = 130 kPa
Initial volume (V₁) = V
Final pressure (P₂) = 145.5 kPa
Final volume (V₂) =?
P₁V₁ = P₂V₂
130 × V = 145.5 × V₂
130V = 145.5 × V₂
Divide both side by 145.5
V₂ = 130V / 145.5
V₂ = 0.89V
Therefore, the final volume of gas will be 0.89 times the initial volume.
How many atoms each element are in the formula shown?
Answer:
In 2C2H6, The C= 4 and H= 12
How many ATP's is produced in the glycolysis of 2 glucose molecules?
Answer: 4 ATP molecules is produced in the glycolysis of 2 glucose molecules
How is ATP produced?The first stage of most carbohydrate catabolism, which is described as the breakdown of larger molecules into smaller ones, is glycolysis, which is a part of cellular respiration. Two Greek words that mean "to break down anything sweet" are the source of the word glycolysis. Two molecules of ATP are created during the breakdown of glucose and formation of pyruvate during glycolysis.
Explanation:
2 ATP are produced.
For every glucose molecule, meaning that for every 2 glucose molecules, 4 ATP will be created.
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(a) The student made two mistakes in setting up the apparatus.
Identify the two mistakes.
Describe the problem each mistake would cause.
The first mistake that the student made is drawing the start line with ink. So it will run/dissolve in the solvent / split up
The second mistake that the student made is placing the solvent above the spots or start line instead of under them. So they will mix with solvent or wash off paper or color the solvent or dissolve in the solvent.
In the first mistake, there is no clear, visible starting line for the experiment as the ink flows or dissolves in the solvent. This error can lead to confusion and inaccuracy in results as students cannot accurately measure or compare the progress of their experiments.
The second mistake, it mixes or washes away the solvent with the dirt and starts the line, making it difficult or impossible to observe or measure the progress of the experiment. This error can also lead to inaccuracies in results, as students may not be able to accurately measure or compare the progress of their experiments.
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Which of the following is not a vector?
O velocity
O momentum
O acceleration
O mass
Answer:
The mass is not a vector.
because It has only magnitude but not direction.
How many atoms are in NaN(OH)3
Answer:
Na----1
N-----1
O-----3
H-----3
3+3+1+1 =8
There are 8 atoms in that compound.
what is the percent yield if the combustion of gasoline results in 680 grams of steam produced when a theoretical yield is 985 grams of steam?
Answer:
69%
Explanation:
Percent yield = ?
Theoretical yield = 985 grams
Experimental Yield = 680 grams
Percent Yield = Experimental Yield / Theoretical Yield * 100
Percent Yield = 680 / 985 * 1 00
Percent Yield = 0.690 * 100 = 69%
What is the structure of a compound of molecular formula C10H14O2 that shows a strong IR absorption at 3150 ¾2850 cm-1 and gives the following 1H NMR absorptions: 1. 4 (triplet, 6H); 4. 0 (quartet, 4H); and 6. 8 (singlet, 4H) ppm?
First, we must compute the index of hydrogen deficiency, IHD, using the molecular formula of the compound [tex]C_{10}H_{14}O_{2}[/tex].
What is a spectrum data?
Spectrum data is data collected from spectroscopic experiments, which measure the interaction of matter with electromagnetic radiation. This data can be used to identify the chemical composition of a sample, as different elements and molecules absorb and emit radiation at different wavelengths.
Then, number of C atoms - [tex]\frac{number of atoms}{2} + 1[/tex]
= [tex]10 + \frac{14}{2} + 1[/tex]
= [tex]10 - 7 + 1[/tex]
= [tex]4[/tex]
Based on the molecular structure, this tells us how many multiple bonds and rings the compound has.
This compound contains four unsaturated bonds. We can tell from the spectrum data that it is aromatic (chemical shifts above 6 comes from aromatic protons). Based on this, we can conclude that the structure of this compound contains a benzene ring. Four IHD are found in the benzene ring, one from the ring and three from double bonds.
Following that, IR spectrum data revealed that absorption on [tex]3150-2850 cm^{-1}[/tex] indicated hybridised CH bonds.
The following chemical shifts are observed in the NMR spectrum data:
On 1,4ppm, it becomes a 6H triplet. It has two protons in its neighbourhood because it is a triplet, and it comes from [tex]CH_{3}(1)[/tex]. This group must be linked to the [tex]CH_{2}(2)[/tex].
A quartet on 4,0ppm, belongs to 4H from [tex]CH_{2}(2)[/tex]. It has 3 protons in neighborhood stop it it attached to the [tex]CH_{3}(1)[/tex] and singlet on 6,8ppm comes of aromatic protons, 4H (3).
Based on the [tex]^{1} HNMR[/tex] spectrum data, we can only attach the two O atoms to the benzene ring and the [tex]CH_{2}(2)[/tex] group.
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Which of the following answers correctly describes protons?
O A) Protons have a positive charge and are located outside of the atom's nucleus.
O B) Protons have a negative charge and are located inside the atom's nucleus.
OC) Protons have a positive charge and are located inside the atom's nucleus.
OD) Protons have a neutral charge and are located outside of the atom's nucleus
1- Give the chemical formula for trans-dichlorobis(ethylenediamine)platinum(IV). Use (en) as the symbol for ethylenediamine.
2- Give the systematic name of this coordination compound.
Na[Al(OH)4]
1.trans-[Pt(en)2Cl2]2+
2.coordination compound Na [Al (OH)] systematic name: sodium tetrahydroxidoaluminate (III)
For several industrial and technical applications, sodium aluminate serves as an efficient supply of aluminum hydroxide. A white crystalline solid with the chemical formula NaAlO2, NaAl(OH)4 (hydrated), [2] Na2OAl2O3, or Na2Al2O4, pure sodium aluminate (anhydrous) is a white substance. Both a solution and a solid form of sodium aluminate are sold commercially.Other comparable compounds, often referred to as sodium aluminate, include Na5AlO4 and Na7Al3O8, which contain complex polymeric anions and Na17Al5O16 and NaAl11O17, which was originally wrongly thought to be -alumina, a phase of aluminum oxide.Aluminum chloride, sodium chloride, and water are produced when hydrogen chloride and sodium tetrahydroxoaluminate interact. Diluted hydrogen chloride in a solution form.
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How many joules of heat are required to raise the temperature of 174g of gold from 22°C to 85°C? The specific heat of gold is 0.129 J/g°C.
Write the expression using a single exponent.
–4^7(4^7)
–4^4
–4^11....correct
4^11
–16^11
part 2 of it is
5^9/5^3=5a
a=_____ ........... 6
Part 3 is (6^2)^7
6^5
6^9
6^14...correct
6^49.
The mathematical expressions written using a single exponent are as follows:
4⁴(4⁷) = 4¹¹
5⁹/5³; a = 6
(6²)⁷ = 6¹⁴
What are exponents in a mathematical expression?A number or letter written above and to the right of a mathematical expression known as the base is termed an exponent. It denotes that the base is to be increased in strength.
Consider the following expression: xⁿ
In the given expression above, the base is x, while the exponent or power is n. For expressions having the same base, the exponents are added if the expressions are to multiplied, and subtracted when the expressions are to be divided.
The exponents are multiplied if the exponents are raised to a power.
Considering the given expressions:
4⁴(4⁷) = 4¹¹
5⁹/5³ = 5⁶
Hence, a = 6
(6²)⁷ = 6¹⁴
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If your end product is 1.5 moles of KMnO 4 how many moles of manganese oxide were used in the reaction? The equation for the production of potassium pemanganate is as follows 2 MnO 2 +4 KOH+O 2 2 KMnO 4 +2 KOH+H 2
Answer:
1.5 moles
Explanation:
The equation of the reaction is given as:
2 MnO2 + 4 KOH + O2 --> 2KMnO 4 + 2KOH + H2
From the equation,
2 moles of MnO2 produces 2 moles of KMnO4
x moles of MnO2 would produce 1.5 moles of KMnO4
2 = 2
x = 1.5
Solving for x;
x = 1.5 * 2 / 2
x = 1.5 moles
How many grams of Sulfuric Acid are needed to produce 57.18 g of Lead (IV) Sulfate when being neutralized by a sufficient amount of Lead (IV) Hydroxide? *
Answer:
40.72g of sulfuric acid are needed
Explanation:
When sulfuric acid, H₂SO₄, is neutralized by lead (IV) hydroxide, Pb(OH)₄, Lead (IV) sulfate, Pb(SO₄)₂ and water as follows:
2 H₂SO₄ + Pb(OH)₄ → Pb(SO₄)₂ + 4H₂O
To solve this question we must find the moles of 57.18g of Pb(SO₄)₂. As 2 moles of H₂SO₄ produce 1mol Pb(SO₄)₂ we can find the moles of H₂SO₄ and its mass as follows:
Moles Pb(SO₄)₂ -Molar mass: 275.23 g/mol-
57.18g * (1mol / 275.23g) = 0.2078 moles Pb(SO₄)₂
Moles H₂SO₄:
0.2078 moles Pb(SO₄)₂ * (2mol H₂SO₄ / 1mol Pb(SO₄)₂) = 0.4155 moles H₂SO₄
Mass H₂SO₄ -Molar mass: 98g/mol-
0.4155 moles H₂SO₄ * (98g / mol) =
40.72g of sulfuric acid are neededwhat is a balanced nuclear equation for power generation?
A balanced nuclear equation for power generation by nuclear fission is given below:
²³⁵₉₂U + ¹₀n ---> ⁹²₃₆Kr + ¹⁴¹₅₆Ba + EnergyWhat is nuclear fission?The process of nuclear fission involves the splitting of an atom's nucleus into two or more smaller nuclei. Even by the energetic standards of radioactive decay, the fission process releases a very high quantity of energy and frequently results in gamma photons.
Nuclear fission is applied in nuclear power generation in a nuclear reactor.
The fissionable nuclear material is separated in the nuclear reactor so that a critical mass cannot exist, and the neutron flux and absorption are controlled to stop the fission reactions. The energy released during fission processes in a nuclear reactor used to generate electricity is trapped as thermal energy and used to heat water and create steam. The steam is utilized to turn a turbine, which powers an electricity-generating generator.
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In an experiment, 24g of magnesium react with 73g of hydrogen chloride to produce a gas and 95g of magnesium chloride.
Write a balanced chemical equation for this reaction
What type of chemical equation for this reaction?
Do these results support the Law of Conservation of Mass Explain your answer.
Answer:
Mg + 2HCl=== Mg(Cl)2 + H2
The Reaction is a single displacement reaction.
Yes!
This reaction obeys the law of conservation which states that for a closed system... Matter and energy transfer is constant.
Meaning that the Mass of products must equal mass of Reactants
To prove this
lets Calculate the Mass of reactants
24g + 73g=97g.
Mass of Products...
95g + x.
let's calculate the mass of Hydrogen produced.
Note: You can get it using any of the reactants... I'll use Magnesium
Now from the balanced reaction.... 1mole of Mg reacts to produce 1mole of Hydrogen
Moles of Mg=Mass/Molar Mass
Given Mass=24g
Molar mass of Mg=24
Mole of Mg =24/24
=1mole
Since Mole ratio of Mg and H2 is 1:1.... Therefore 1Mole of Hydrogen is produced too.
To get Mass of H2
Again
Mole=Mass/Mm
Known= 1mole of H2 isproduced
Mass of H2 =2g
Mole=Mass/Mm
Mass =Mole x Mm
= 1 x 2
=2g
Now
Total Mass of products is
95 +2 = 97g.
This is the same with the Mass of Reactants
So The Law of Conservation of Mass Holds.