In second energy level, maximum 8 electrons can be filled.
How many electrons can hold the energy level?For the first four energy levels, the maximum number of electrons are as follows:
I Energy level: 2 electrons max.
II Energy level: 8 electrons max.
III Energy level: 18 electrons max.
IV Energy level: 32 electrons max.
The greatest number depends on how many orbitals are present at a certain energy level. A volume of space within an atom known as an orbital is where an electron is most likely to be found.
As a result, we may conclude that Energy level II has four orbitals and hence, requires eight electrons to completely occupy it.
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Calculate the amount (in mol ) in 8.80g of carbon dioxide CO2
Explanation:
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Iron(III) oxide reacts with carbon monoxide to produce elemental iron and carbon dioxide.
Fe2O3(s) + 3CO(g) ===> 3CO2(g) + 2Fe(s)
Determine the enthalpy change of this reaction.
Answer:
the option is (A)
Explanation:
The balanced chemical equation is
4Fe
(g)
+3O
2(g)
→2Fe
2
O
3(g)
Thus, 4 moles of Fe reacts with 3 moles of oxygen to form 2 moles of ferric oxide.
So 8 moles of Fe will react with 3×
4
8
=6 moles of oxygen to form 2×
4
8
=4 moles of ferric oxide.
9.0−6=3.0 moles of oxygen will remain as excess.
2. Magnesium metal reacts with sulfuric acid (H₂SO4) forming hydrogen gas and magnesium
sulfate
Answer: Mg(s) + H2SO4(aq) + H2(g)
Explanation:
Magnesium sulfate:
Magnesium sulfate is a chemical compound, a salt with the formula .
Magnesium reacts with dilute Sulphur acid to form Magnesium sulfate and Hydrogen gas.
Mg(s) + H2SO4(aq) + H2(g)
This reaction is a single displacement reaction and also exothermic.
Therefore, the balanced chemical equation for the reaction of magnesium solid with sulfuric acid to form hydrogen gas and magnesium sulfate is
Mg(s) + H2SO4(aq) + H2(g)
.
11. The greenhouse effect is what allows structures like greenhouses to be much warmer than they otherwise would be by capturing sunlight, and not allowing it to
escape. A similar effect is happening to our planet because carbon dioxide is trapping the sun's heat close to the earth. Carbon dioxide is a byproduct of burning
fossil fuels. If we burn less fossil fuels in the future, what will be the most likely effect on carbon dioxide levels?
O A. Stay the same
OB. Increase
O C. Will fluctuate between increasing and decreasing
OD. Decrease
If we will burn less fossil fuels in the future, the carbon dioxide levels will eventually decrease.
What will be the most likely effect on carbon dioxide levels?Significant amounts of carbon are released into the atmosphere as a result of the burning of fossil fuels and the use of limestone in concrete. As a result, the atmospheric concentration of carbon dioxide is growing substantially. This greenhouse gas (carbon dioxide) interacts with solar energy in the Earth's atmosphere leading to the greenhouse effect.
Greenhouse effect prevents excess heat from the planet's atmosphere that would otherwise escape to space, thus the greenhouse effect plays a significant role in maintaining the planet's temperature. Long-term emission reductions assist us in preventing catastrophic climate change.
Reducing the use of fossil fuels helps human health, environmental ecosystems, and even saves lives practically instantly. It is not merely a long-term investment to delay climate change
Thus, the correct answer is- decrease in the carbon dioxide level.
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what is the percent yield of a reaction if when 5 moles of acetylene (c2h2) is reacted with excess o2 gas, 8 moles of co2 are formed?
A response has an 80% percent yield.
What is percent yield of a reaction?The real yield is calculated as the theoretical yield divided by the theoretical yield multiplied by 100. % Yield = (Actual Yield % Theoretical Yield Numerous factors, which will be covered in later chapters of the course, can cause a chemical reaction's actual yield to be lower than its theoretical yield.
It is beneficial to have a high yield percentage since it shows that there were fewer contaminants present throughout the experiment and it can improve computation accuracy.
Balanced equation is,
2C₂H₂ + 5 0₂----> 4 CO₂ + 2 H₂O
percent yield of reaction is = moles of product/moles of reactant×100
actual moles of acetylene is = 5/2=2.5
actual moles of Co₂ is = 8/4=2
percent yield of reaction is = 2/2.5×100
percent yield of reaction is = 80%.
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The list below includes some of the properties of ammonia. Identify the physical properties in the list. Check all of the boxes that apply.
• gas at room temperature
• strong, unpleasant odor
• reacts with hydrochloric acid
• dissolves easily in water
• burns in oxygen
The physical properties of ammonia iare as listed below:
gas at room temperature strong, unpleasant odordissolves easily in waterWhat is ammonia?It the compound which is composed of four atoms one is nitrogen and rest are hydrogen.
What are the Physical property?A physical properties are those properties which is measurable and whose values describe the state of a physical system. The favourable changes in the physical properties of a given system is used to describe its changes mostly between the momentary states. Physical properties are referred as a observables. They are not kind of modal properties.
What is chemical property?Chemical property is defined as the characteristic of the particular substance which can be observed in the chemical reaction. Some of the major chemical properties of any substance include toxicity, flammability, pH value, heat of combustion, rate of radioactive decay, and chemical stability.
Thus, we concluded that the physical properties of ammonia are as listed below:
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Answer:
- gas at room temperature
- strong, unpleasant odor
- dissolves easily in water
Explanation:
What is sanitizer testing?.
Manufacturing companies may verify ingredients and check for contaminants to make sure their products are safe to use by testing the raw materials that go into their sanitizers and disinfectants.
What does sanitizer really mean?a material or item used to lessen or get rid of harmful elements (like germs) on surfaces. As of the beginning of September, sales with alcohol-based hand sanitizers remained roughly 17% higher than they were during the same time last year.
Is booze an effective sanitizer?However, broadly speaking, sanitizers with 60 to 95% alcohol are appropriate. The Center fer Prevention and Control suggests formulations using 80% (percent quantity) ethanol and 75% isopropyl alcohol.
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Marie and Calvin tried to dissolve 45 grams of NaCl in 100 grams of water at 80°C. Only 40 grams dissolved, 5 grams settled at the bottom
of the beaker. The solution is then said to be
at 80°C.
The solution is then said to be saturated at 80°C
What is solubility?The amount of a solute that will dissolve in a fixed amount of solvent (often 100 grams of water) at a specific temperature to create a saturated solution is known as its solubility.
To show the solubility at various temperatures, a solubility graph is drawn. One can determine the mass of a solute that can dissolve at particular temperature, whether or not a solution is saturated, and compare the solubilities of various compounds at particular temperatures by looking at a solubility graph. These graphs allow us to determine if the solution is saturated or unsaturated.
We can conclude that the solution is saturated in this scenario because some solids are already not dissolved in the solution.
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suppose you need to make 400 ml of a solution with a ph of 14 at 298 what mass of sr(oh)2 should you add to a 400 ml volumetric flask
Mass of Sr(OH)₂ should be added to a 400 ml volumetric flask is 24.34 gm.
Let the mass of Sr(OH)₂ = P g
Molar mass of Sr(OH)₂ = 121.63 g/mol
Mole of Sr(OH)₂ = P gm/ 121.63 g mol⁻¹ = 0.00822 × P mol
[Sr(OH)₂] = (0.00822 × P mol) / 0.400 L = (0.2055 × P) M
[OH⁻] = 2 × [Sr(OH)₂] = 0.0411 P M
pH = 14
pOH = 14 - 14 = 0
[OH⁻] = 10⁰ = 1
∴ 0.0411 P M = 1
⇒ P = 24.34 gm
Hence, mass of Sr(OH)₂ should be added to a 400 ml volumetric flask is 24.34 gm.
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Measured value 28.7053 cm, which has six significant figures.
Round the measurement to four significant figures.
Measured value 28.7053 cm, which has six significant figures . Round the measurement to four significant figures is 28.71 cm
To count the significant number there are some rules to follow are :
all non zero number are significant figure.zeros between the two non zero number are count as significant figurea trailing zero in the decimal portion only are significant figure.if zero precedes the bon zero number then it is not consider as the significant figure.zero at the end or on the right side of the given number also consider as significant figure.Thus, Measured value 28.7053 cm, which has six significant figures . Round the measurement to four significant figures is 28.71 cm
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When the wavelength of a wave increases, what happens to the frequency of the wave?
I already know if the wavelength increases, the frequency decreases, but how does that happen exactly?
When the wavelength of a wave increases, the frequency of the wave decreases.
What is wavelength?Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.
Wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.
Wavelength can be calculated as follows;
λ = v/f
λ = wavelengthv = velocityf = frequencyThe relationship between wavelength and frequency is inverse i.e. as one increases, the other decreases.
Therefore, as the frequency decreases, the wavelength increases and vice versa.
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how do you feel about the changes of male and female
Answer: If you are talking about Hormones or how they have been changing recently through puberty then i think kids are now starting to look up to older people or kids so that’s why they seem older
A wetland being drained so a housing development can be built is an example of ____________.
Wetlands being drained for housing development are an example of habitat destruction.
What is Habitat Destruction?A wetland is a place where land is seasonally or permanently covered with salt water, fresh water, or something in between.
Habitat destruction is the elimination or alteration of the conditions necessary for the survival of plants and animals, affecting the health of individual species as well as the global ecosystem. Group of dwellings or condominiums, generally of similar construction, generally constructed and sold or leased by a manager. Habitat destruction can lead to species loss.
Drainage of wetlands into housing estates therefore causes habitat destruction.
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When a piece of sodium metal is dropped into a calorimeter filled with water, hydrogen gas evolves. The temperature of the mixture rises because.
A piece of sodium metal is dropped into a calorimeter filled with water, hydrogen gas evolves. The temperature of the mixture rises because As an intensive physical property.
Calorimeter, device for measuring the heat developed throughout a mechanical, electric, or chemical reaction and for calculating the heat ability of substances. Calorimeters have been designed in splendid range.
The frame at better temperature releases heat while the body at lower temperature absorbs heat. The principle of calorimetry shows the regulation of conservation energy, i.e. the overall warmness lost through the new frame is same to the full warmth won by way of the cold body.
The primary ice calorimeters have been built based on Joseph Black's idea of latent warmness, introduced in 1761. Antoine Lavoisier coined the time period calorimeter in 1780 to explain the apparatus he used to measure warmth from guinea pig breathing used to melt snow.
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In a solution, the substance present in the largest quantity is called the , while any other dissolved components are called.
In a solution, the substance present in the largest quantity is called the solvent , while the substances dissolved in smaller quantities are called solute.
What is the difference between a solvent and solute?
In Chemistry, solvent is defined as the medium which dissolves the other substances.
In general, a solution is a combination of a solute and a solvent.
For example, let's take a mixture of water, slat and sugar.
Here water is the solvent as it is present in large quantity while sugar and salt are solutes.
To put it simply, a solution is a homogenous mixture that is formed when solute is added to the solvent.
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Why do nadh and fadh2 donate electrons to different electron transport chain complexes?.
NADH and FADH2 donate electrons to different electron transport chain complexes because the citric acid cycle and glycolysis both rely on the oxidized forms of these electron carriers to function, and these forms must be readily available.
Define the process of electron transfer in mitochondria.Through oxidative phosphorylation, the mitochondrial electron transport chain uses a series of electron transfer reactions to produce cellular ATP. Reactive oxygen species (ROS), which support both homeostatic signaling and oxidative stress during disease, are produced as a result of electron transport.
In this visual presentation, we give an overview of oxidative phosphorylation and how it interacts with the electron transport chain's creation of ROS. We also provide various translational methodologies for evaluating mitochondrial energetics in both healthy and unhealthy conditions.
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What is the molar ratio of acid to base for the neutralization reaction between hcl and naoh?.
1:1 is the molar ratio of acid to base for the neutralization reaction between HCl and NaOH.
HCl + NaOH → NaCl + H₂O
A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. The neutralization of a strong acid and strong base has a pH equal to 7.
Neutralization is the reaction of an acid and a base, which forms water and a salt.
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Match the statements for the three principles for Newton's Law of Gravitation.
1 .
Gravitational force
attracts every other object.
2 .
Every object
depends on the quantity of mass.
3 .
Distance between objects
factor that also affects the force of gravity.
please answer quick grrrr betch as neggas
According to the principles of gravitation by Newton, every objects attracts every other objects. The gravitational force depends on the quantity of mass and the distance between objects factor that also affects the force of gravity.
What is gravitational force?Gravitational force is a kind of force by which an object attracts other objects into its centre of mass. This force of attraction depends on the mass of both objects.
Gravity is directly proportional to the mass of the object and inversely proportional to the distance between the objects. Thus force of gravity increases with mass and decreases with distance.
The sentences can be completed as:every objects attracts every other objects. The gravitational force depends on the quantity of mass and the distance between objects factor that also affects the force of gravity.
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Answer:Match the statements for the three principles for Newton's Law of Gravitation.
1 .
Gravitational force
attracts every other object.
2 .
Every object
depends on the quantity of mass.
3 .
Distance between objects
factor that also affects the force of gravity.
please answer quick grrrr betch as neggas
Explanation:
An atom of silicon has a mass number of 28 and an atomic number of 14. How many protons are in this atom?.
The atomic number states the number of protons, so the number of protons in the element silicon is 14.
Atomic StructureAtoms are made up of subatomic particles namely protons, electrons and neutrons. In an atom the three particles have a certain amount.
Protons are particles that make up atoms that are positively charged and have a mass as large as that of hydrogen, which is 1.67262 x 10⁻²⁷ kg or 1,836 times heavier than electrons. Protons are so deep in the atomic nucleus that they cannot be disturbed by particles outside the atom.
The element silicon (Si) has an atomic number = 14 and a mass number = 28
So that the number of subatomic particles is:
The number of protons = atomic number
= 14
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you have found that the hardness of a water sample is 0.00115 mol caco 3 per liter. what is this expresses as milligrams caco 3 per liter.
Mass of CaCO3 per liter =115.09 milligrams.
What is a milligram?The metric system's abbreviation mg stands for milligram. The smallest unit of weight, the milligram, is used to quantify minuscule amounts, such as powdered compounds that will be utilized in a scientific experiment. A paper clip weighs about one gram, which is the metric system's accepted unit of weight.
Molar mass of CaCO₃ = 100·0869 g/mol
moles per liter = 0.00115 mol
Mass of CaCO₃per liter = moles x Molar mass
Mass of CaCO₃ per liter = 0.00115 x 100·0869
Mass of CaCO₃ per liter = 0·11 509grams
Mass of CaCO₃ per liter = 115.09 x 10⁻³ grams
10⁻³g = 1 milligram
Mass of CaCO₃ per liter =115.09 milligrams.
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a ring, a disk, and a solid sphere all of equal mass begin rolling down a hill together. which reaches the bottom first?
A ring, a disk, and a solid sphere all of equal mass begin rolling down a hill together. the one which reaches the bottom first is the sphere.
A ring , a disk and a solid sphere all have equal mass. the moment of inertia of all is given as :
a ring : m r²
a disk = 1 / 2 mr²
a solid sphere : 2 / 5 mr²
where m is the mass of all . and r is the radius which is same for all. so the object which the the least moment of inertia will reach the bottom first.
Thus, A ring, a disk, and a solid sphere all of equal mass begin rolling down a hill together. the one which reaches the bottom first is the sphere.
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which of the choices below shows the correct ordering of k, fe, se, and kr from largest atomic radius to smallest?
The correct ordering of K, Fe, Se, and Kr from largest atomic radius to smallest is K > Fe > Se > Kr.
The atomic radius of an element can be defined as distance from the nucleus to the outermost shell of the atom. The trend of atomic radius in the periodic table is that when we move from top to bottom in a group the atomic radius of chemical element increases . when we move from left to right in a period the atomic size decreases. so according to this the atomic size of given elements from largest atomic radius to smallest atomic radius is K > Fe > Se > Kr.
Thus, The correct ordering of K, Fe, Se, and Kr from largest atomic radius to smallest is K > Fe > Se > Kr.
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Freon 12(molar mass 120.91 g/mol) is a common refrigerant that is vaporized in tubes inside a refrigerator, releasing heat. This results in heat being released to the outside of the fridge. If 500g of the Freon is vaporized, what is the expected enthalpy change.
The expected enthalpy change in the process of the vaporization of freon is 144.7 kJ.
What is the enthalpy change of a substance?The enthalpy change of a process or reaction is the amount of heat absorbed or evolved during by the process.
The expected enthalpy change in the process of the vaporization of freon is calculated from the formula below as follows:
Molar enthalpy of vaporization = enthalpy change/mole of a substanceHence;
Enthalpy change = molar enthalpy of vaporization * moles of substance
molar enthalpy of vaporization of freon = 34.99 kJ/mol
Moles of freon = mass/molar molar mass
moles of freon = 500 / 120.91 moles
Enthalpy change = 34.99 kJ/mol * 500 / 120.91 moles
Enthalpy change = 144.7 kJ
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Complete question:
A common refrigerant (Freon-12, molar mass 120.91 g/mol) is alternately vaporized in tubes inside a refrigerator, absorbing heat, and condensed in tubes outside the refrigerator, releasing heat. This results in energy being transferred from the inside to the outside of the refrigerator. The molar enthalpy of vaporization for the refrigerant is 34.99 kJ/mol. If 500.0 g of the refrigerant is vaporized, what is the expected enthalpy change Δ H??
suppose that copper (i) phosphide (cu3p) is added as an impurity to vanadium (iii) phosphide (vp), what types of vacancies are likely to form
copper phosphate = c
Copper phosphate is the given compound.Cu₃(PO₄)₂Copper (II) phosphate is another name for it.Cupric salt of phosphoric acid is another name for it.The molar mass of this compound is 380.58 g/mol.It is light blue in color and comes in the form of powder.It is not water soluble.Mineral acids and ammonia dissolve it.Copper is the cation in this compound, while phosphate is the anion.When it comes into contact with strong acids like sulfuric acid, it produces phosphoric acid and copper salt.3 Cu2CO3(OH)2 + 4H3PO4 2Cu3(PO4)2 + 3CO2 + 9H2O
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In an aqueous solution, what particle do acids donate?
An acid is capable of donating a proton or hydrogen ion to another substance.
What are acids?Acids are substances that can donate H+ ions to bases. therefore a hydrogen atom is a proton and one electron, technically an H+ ion is just a proton. A base is a molecule or ion up to accept a hydrogen ion from an acid. Acidic substances are usually recognized by their sour taste.
The stronger the acid, the more readily it donates H+. For example, hydrochloric acid (HCl) totally dissociates into hydrogen and chloride ions and is high.
So we can conclude that Acids give away particles with a positive charge. Bases receive positively charged particles. They are both critical for chemical reactions.
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Group 5A, period 3 element
if 0.0304 mol cacl2 is dissolved in water to make a 0.400 m solution, what is the volume of the solution?
The volume of the solution is 0.01216 L
What is volume of a solution ?
A three-dimensional space's occupied volume is measured. It is frequently measured numerically with SI-derived units (such the cubic meter and litre) or with other imperial units (such as the gallon, quart, cubic inch). Volume and length are related in how they are defined (cubed). The volume of a container is typically thought of as its capacity, or the amount of fluid (gas or liquid) that it could hold, as opposed to the amount of space the container occupies.
Given ,
molarity (M )= 0.400 M
Number of mole ( n)= 0.0304 mol
Volume (V)=nM
V = 0.400 * 0.0304
V = 0.01216 L
Hence, volume of solution is 0.01216 L
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Which compound is an exception to the octet rule?
H₂O
HCI
CCL
CIF 3
intrinsic kinetics of gypsum and calcium sulfate anhydrite dissolution: surface selective studies under hydrodynamic control and the effect of additives
Under far from equilibrium conditions, the intrinsic dissolving activity of the basal (010) or edge (001) surfaces of polygonal calcium sulfate anhydrite crystals and gypsum has been studied.
What the definition of kinetics?A field of science that studies how forces affect the motions of physical objects or how a biological or chemical system changes, as well as how quickly such a system is changing and how a natural or chemical change was brought about.
What is difference between kinematics and kinetics?Two disciplines of physics known as kinematics and kinetics deal with how an item moves. Despite the fact that both terms have a similar pronunciation, they differ in a few ways. Equations of motion are used in kinematics to describe motion.
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a diluted saline solution is needed for routine procedures in a hospital. the supply room has a large quantity of 20% saline solution and 40% saline solution, but needs 10 liters of 25% saline solution. write a system of equations to represent this situation.
From system equation to make 10 liters of 25% saline solution we need 2.5 L saline 40% and 7,5 L saline 20%
to calculate how much saline solution 40% and 20% needed to make 10L 25% saline solution we can calculate by system of equation below:
We can call the amount of 40% solution x and the amount of 20% solution y.
x + y = 10 (1)
0.40x + 0.20 y = 10 * 0.25
0.40x + 0.20 y = 2.5
4x + 2y = 25 (Multiply by 10 to get rid of decimals) (2)
we use elemination way to get the x
2x + 2y = 20(Multiply (1) by 2) (3)
so if formula (2) - formula (3)
4x + 2y = 25
2x + 2y = 20 -
2x = 5
x = 2.5
y= 10-x
y= 10- 2.5 = 7.5
so we need 2.5 L saline 40% and 7,5 L saline solution 20%
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