The percent yield of [tex]MgO[/tex] is 58.79%
According to the following balanced reaction, magnesium interacts with oxygen to generate magnesium oxide:
[tex]2Mg + O_2 \rightarrow 2MgO[/tex]
Given mass of solid magnesium = 0.261g
Molar mass of Mg = 24g/mol
Using formula , [tex]Number of moles =\dfrac {mass} {molar mass} = \dfrac {0.261g} {24g/mol} = 0.0108mole[/tex]
We could theoretically make 0.0108 moles of [tex]MgO[/tex] since the reaction yields an equimolar quantity of [tex]MgO[/tex]. It is clear from the above reaction that 2 moles of magnesium result in 2 moles of magnesium oxide.
Hence, mass of [tex]MgO[/tex] = Number of moles [tex]\times[/tex] Molar mass of MgO
mass of [tex]MgO[/tex] = [tex]0.0108mole \times 40g/mole = 0.432g[/tex]
Percent yield = [tex]\dfrac{Actual mass of MgO} {Theoretical mass of MgO} \times 100[/tex]
= [tex]\dfrac{0.254} {0.432} \times 100 = 58.79percentage[/tex]
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Hydrometallurgy uses __________________ to separate a metal from its ore. Multiple Choice solid phase chemical properties electrical processes thermal processes aqueous chemical processes molten salt processes
Hydrometallurgy uses electrical processes.
Hydrometallurgy can be defined as a steel healing method used to gain metals from ores and waste materials with the usage of aqueous media via combining water, oxygen, and other chemical reagents without or with the use of pressurized surroundings.
That is a method of metal or steel compound extraction from ore via pre-remedies that contain the use of a bleaching agent, separation of impurities, and precipitation. It's far used in the extraction of uranium, gold, zinc, silver, and copper from low-grade ores.
In hydrometallurgy, zinc and iron can be used to displace copper from their answer. But to displace zinc, extra reactive metals i.e., metals having decreased reduction potentials than zinc along with Mg, Ca, ok, etc. are required. ... for this reason, copper may be extracted by means of hydrometallurgy but no longer zinc.
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Which situation would cause a red for an observer on the red planet?
Please answer fast if can, will give Brainiest
What can be determined from looking at absorption spectra of a gas?
A. The elements the gas is composed of.
B. The level of radioactivity the gas has.
C. The half-life of the gas.
D. The amount of thermal energy the gas contains.
From the absorption spectra of a gas, we can see the amount of thermal energy the gas contains (option D).
What is the absorption spectra?The absorption spectra shows us the energy that is taken in by a gas. We know that when a gas is heated, it absorbs energy which shows up in its absorption spectra.
Thus, from the absorption spectra of a gas, we can see the amount of thermal energy the gas contains.
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The partial pressure of oxygen in the alveoli is _______ mm Hg, while the partial pressure of carbon dioxide in the alveoli is _______ mm Hg.
The partial pressure of oxygen in the alveoli is about 104 mm Hg, while the partial pressure of carbon dioxide in the alveoli is 40 mm Hg.
What is the partial pressure of gases in the alveoli?The alveoli are tiny air sacs where gaseous exchange takes place between the lung and the bloodstream.
Because oxygen needs to diffuse into the bloodstream while carbon dioxide needs to diffuse out, the partial pressure of oxygen in the alveoli is around 104 mmHg while that of carbon dioxide is 40 mmHg.
With higher partial pressure than in the blood, oxygen from the alveoli will be able to diffuse into the blood. With lower partial pressure than in the blood, carbon dioxide will be able to diffuse from the blood into the alveoli.
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What is the Volume of 1.1 moles of an ideal gas at a Temperature of 21 °C and a Pressure of 760 torr?
Answer:
26.5 L
Explanation:
To find the volume of the gas, you need to use the Ideal Gas Law. The equation looks like this:
PV = nRT
In this formula
-----> P = pressure (torr)
-----> V = volume (L)
-----> n = number of moles
-----> R = constant (62.36 L*torr/mol*K)
-----> T = temperature (K)
Before you can plug the given values into the equation, you need to convert Celsius (°C) to Kelvin (K). Then, you can solve for volume through simplification.
P = 760 torr R = 62.36 L*torr/mol*K
V = ? L T = 21 °C + 273.15 = 294.15 K
n = 1.1 moles
PV = nRT
(760 torr)V = (1.1 moles)(62.36 L*torr/mol*K)(294.15 K)
(760 torr)V = 20177.5134
V = 26.5 L
An unknown weak acid with a concentration of 0.072 M has a pH of 1.80. What is the Ka of the weak acid
The value of Ka of the weak acid is 4.47 x 10^-3.
The acids that do not dissociate completely in the aqueous solution and remains in equilibrium are called weak acids. The acid dissociation constant of the weak acid is represented as Ka.
Consider a weak acid HA. Its dissociation reaction will be:
HA -----> H+ + A-
I 0.072 0 0
C -x +x +x
E 0.072-x x x
Calculations:
pH = -log[H+]
1.80 = -log[H+]
[H+] = 0.01585 M
Hence, x = 0.01585 M
The value of Ka is calculated as:
Ka = x^2/0.072-x
= (0.01585)^2/(0.072 - 0.01585)
= 4.47 x 10^-3
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Elements 3 to 10 (Li to Ne) show a more or less steady increase in IE. What does this tell you about the energy level that each successive electron (from 3 to 10) is assigned to?
Elements 3 to 10 (Li to Ne) show a more or less steady increase in ionization energy.
What is ionisation energy?The amount of energy required to remove an electron from an isolated atom or molecule.
The major difference is the increasing number of protons in the nucleus as you go from lithium to neon. That causes greater attraction between the nucleus and the electrons and so increases the ionization energies. In fact the increasing nuclear charge also drags the outer electrons in closer to the nucleus.
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he naturally occurring form of a metal that is concentrated enough to allow economical recovery of the metal is known as Multiple Choice an element. a mineral. gangue.
The naturally occurring form of a metal that is concentrated enough to allow economical recovery of the metal is known as D)ores.
Ore is natural rock or sediment that consists of one or more valuable minerals, commonly containing metals, that can be mined, handled, and offered at a profit. Ore is extracted from the earth thru mining and treated or subtle, often via smelting, to extract the precious metals or minerals.
Ore is a deposit in Earth's crust of one or greater valuable minerals. The maximum valuable ore deposits include metals crucial to industry and alternate, like copper, gold, and iron. Copper ore is mined for ramification of industrial uses.
Ores are minerals that have a high awareness of a sure detail, commonly metallic. Examples are cinnabar (HgS), an ore of mercury, sphalerite (ZnS), an ore of zinc, cassiterite (SnO2), and an ore of tin (Mineral).
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When you react 8.59 M acetic acid with 8.59 M ethanol, the equilibrium concentration of acetic acid is 3.20 M . What is the equilibrium concentration (M) of ethyl acetate
The equilibrium concentration of ethyl acetate will be 5.39 M.
Initially, 8.59 M acetic acid react with 8.59 M ethanol.
acetic acid + ethanol ===> ethyl acetate + water
(8.59) (8.59) (0)
after some time, some change will happen.
acetic acid + ethanol ===> ethyl acetate + water
(8.59-x) (8.59-x) (x)
At equilibrium condition,
acetic acid + ethanol ===> ethyl acetate + water
(3.20) (3.20) (x)
At equilibrium, for acetic acid and ethanol to go from 8.59 to 3.20, the value of x must be 5.39.
Therefore, the equilibrium concentration of ethyl acetate will be 5.39 M.
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Please help please help
Explanation:
in this question, we're asked how to determine whether we have a metallic or nonmetallic substance.So what you want to do is one to remember that metals are malleable and Nonmetal are brittle. So if we were to hammer the metal, it would be very malleable, but the nonmetal would fall apart. And never we could just hammer the sample and see whether it was malleable. And therefore it would be a medal or a brittle and therefore being nonmetal.
An ionic bond for calcium and oxygen is cao. if an oxygen ion has a charge of two negative, what is the charge for calcium? 2 –1 1 –2
The charge on calcium in CaO is 2.
A bond between two atoms is formed by two ways: by complete transfer of electrons or by sharing of electrons. The bond formed by transfer of electrons is called an ionic bond while the bond formed by electrons sharing is called the covalent bond. There is on clear positive or negative charge on atoms in a molecules in case of covalent bond.
It is given that an ionic bond is formed between calcium and oxygen. The oxygen has -2 charge. This means that oxygen atoms has accepted two electrons from calcium. When an atoms donate electrons it acquires positive charge.
Ca gives two electrons to oxygen atom. Hence, the charge on calcium is +2. The correct option is 2.
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Which of the following are products when magnesium metal is placed in hydrochloric acid? (Correct answer should be D but why)
A-H
B-H+
C-Mg
D-MgCl2
Answer:
an acid +metal =salt +hydrogen
Explanation:
HCL+Mg =Mgcl2+H2
(because Mg has an ion with a +2 charge ,it attracts Cl with a -2 charge )
therefore the correct answer is D for the above reasons
Answer:
When magnesium reacts with hydrochloric acid (HCl), a single-replacement reaction occurs. These reactions involve the substitution of one element in a compound with another. In this case, the hydrogen in HCl will be swapped with the magnesium metal because both of these elements make cations (positively-charged ions) when they participate in ionic bonding.
So why does the chorine have a subscript of 2 when it bonds with magnesium? This occurs in order to balance the ionic charges and make the overall compound neutral.
Magnesium wants to give away 2 electrons when it ionizes, forming the cation Mg²⁺. However, chlorine only wants to gain 1 electron to fill its valence shell, making it form the anion, Cl⁻. As you can see, if just one of each ion were to bond, the compound would have an overall charge of +1 because (+2 - 1 = +1). Therefore, the compound can be made neutral if two chlorine ions bond with just 1 magnesium ion (+2 - 1 - 1 = 0).
The hydrogen ion from HCl becomes H₂ after the reaction occurs. This occurs because hydrogen generally exists as a diatomic compound in nature (diatomic = exists as 2 atoms).
The complete balanced equation for the reaction is:
Mg + 2 HCl ------> MgCl₂ + H₂
Which of the following could have the formula XY₂?
Answer: B
Explanation:
There is an atom of one type of element and then two atoms of another type of element.
How are the products represented in the chemical equation for photosynthesis? o2 6co2 c6h12o6 6h2o 6co2 6h2o c6h12o6 6o2
The chemical equation for photosynthesis is 6CO2+6H2O→C6H12O6+6O2. 6CO2+6H2O→C6H12O6+6O2.
In plants, the process of photosynthesis takes place in the mesophyll of the leaves, inside the chloroplasts.
Photosynthesis is the technique with the aid of which inexperienced plant life and positive other organisms remodel light electricity into chemical strength.
During photosynthesis in green flowers, mild strength is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-wealthy organic compounds.
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Answer:
The answer is actually:
D
Explanation:
How do you identify the components necessary for a combustion reaction?
The ways to identify the components necessary for a combustion reaction include:
Combustible substance.Ignition temperature. A gas which supports it.What is Combustion?This is referred to as burning and involves high-temperature exothermic redox chemical reaction.
This type of reaction involves the use of a gas such as oxygen which supports it and other flammable substances.
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A 600 dm3 sample of hydrogen gas was collected contain at 950mm of hg pressure at room temperature.
The new volume of the hydrogen gas at s.t.p., [tex]V_{2}[/tex] = 750 dm³
What is the molar volume of gas at s.t.p?The molar volume of a gas at s.t.p. is 22.4 dm³.
The change in volume gases at different temperatures and pressures are given by the general gas equation given below:
[tex]\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}[/tex][tex]V_{1}[/tex] = 600 dm³
[tex]P_{1}[/tex] = 950mmHg
[tex]T_{1}[/tex]= 273 K
The new volume of the hydrogen gas at s.t.p., [tex]V_{2}[/tex] is calculated thus:
[tex]V_{2}[/tex] = (950 x 600 x 273)/(760 x 273) = 750 dm³
In conclusion, the volume of a gas changes with temperature and pressure changes.
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A student has a block that has volume of 150 cm3 and a density of 30 g/cm3.what is the mass of the block?
A.4,500g
B.0.2g
C. 5g
D.450 g
A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.
What is density?Density is an intrinsic property of matter, equal to the quotient between the mass and the volume.
A student has a block with a volume (V) of 150 cm³ and a density (ρ) of 30 g/cm³. We can calculate its mass (m) using the definition of density.
ρ = m/V
m = ρ × V = 30 g/cm³ × 150 cm³ = 4,500 g
A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.
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Write the correct chemical formula for hexacyanoferrate (III) ion.
Which is the correct chemical name for Fe(CN)6^4-?
Which is the correct chemical name for Zn(OH)4^2–?
Write the correct chemical name for PtCl6^2–
Which is the correct chemical name for Cr(OH)4^2–?
C6FeN6⁻³ is the correct chemical formula for hexacyanoferrate (III) ion.
What is Chemical formula?This contains information about the proportion of atoms present inn a chemical compound.
The correct chemical name for Fe(CN)6^4- is Ferrocyanide.The correct chemical name for Zn(OH)4^2– is Tetrahydroxidozincate(II).The correct chemical name for PtCl6^2– is Hexachloridoplatinate(IV) ion.The correct chemical name for Cr(OH)4^2– is Tetrahydrochromate.Read more about Chemical formula here https://brainly.com/question/26388921
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In the following neutralization reaction 2CsOH(aq) H2SO4(aq), the salt produced will be _______________
The salt produced by the neutralization of 2CsOH(aq) and H₂SO₄(aq) is Cesium Sulphate - Cs₂SO₄.
What is neutralization reaction?The neutralization reaction takes place between an acid and a base to produce a salt and water. The salt formed in the neutralization process is an ionic compound that consisting of an anion from the acid and a cation from the base.Neutralization reaction for the given compounds:The given compounds are
2CsOH - a strong base and H₂SO₄ - a strong acid
When they react with one another, the neutralization takes place and forms a neutral compound Cs₂SO₄ called as a salt.
The reaction is as follows:
2CsOH(aq) + H₂SO₄ → Cs₂SO₄ + H₂O
Therefore, the salt produced will be Cs₂SO₄(Cesium sulphate).
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What is the empirical formula of a compound containing 5.03 grams carbon, 0.42 grams hydrogen, and 44.5 grams chlorine?
a. c2h5ci
b. c2h2c1
c. chcia
d. chci
The empirical formula of the compound is CHCl₃.
Calculation:Given,
Mass of carbon = 5.03 g
Mass of hydrogen = 0.42 g
Mass of chlorine = 44.5 g
Molecular weight of carbon = 12 g
Molecular weight of hydrogen = 1 g
Molecular weight of chlorine = 35.4 g
First, calculate the moles of each element,
Moles = given mass/ molecular weight
Moles of carbon = 5.03/12 = 0.42
Moles of hydrogen = 0.42/1 = 0.42
Moles of chlorine = 44.5/ 35.4 = 1.26
Divide the moles of each element by the smallest number of moles,
0.42 mol of C/ 0.42 = 1 C
0.42 mol of H/ 0.42 = 1 H
1.26 mol of Cl/0.42 = 3 Cl
The ratio of elements is 1:1:3
Therefore the empirical formula of the compound will be CHCl₃.
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Answer:CHCl₃
Explanation:
Effects to the nutrient cycle if the water cycle, oxygen cycle and carbon cycle are affected
Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
The empirical formula of compounds formed from the given ions are as follows:
Pb⁴⁺ = PbO₂NH₄⁺ = NH₄ClCrO₄²⁻ = Na₂CrO₄SO₄²⁻ = K₂SO₄What is the empirical formula of a compound?The empirical formula of a compound is the simplest formula of the compound showing the simplest ratios in which elements in the compound combine.
The empirical formula of compounds formed from the given ions are as follows:
Pb⁴⁺ = PbO₂NH₄⁺ = NH₄ClCrO₄²⁻ = Na₂CrO₄SO₄²⁻ = K₂SO₄In conclusion, the empirical formula is the simplest formula of a compound.
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Which person has the most momentum?
A. A 50 kg person with a velocity of 3 m/s south
B. A 85 kg person that is stationary
O C. A 65 kg person with a velocity of 2.0 m/s east
D. A 65 kg person with a velocity of 2.5 m/s north
The most momentum is D. A 65 kg person with a velocity of 2.5 m/s north.
What momentum really means?Momentum can be defined as "mass in motion." All items have mass; so if an object is moving, then it has momentum - it has its mass in movement. The amount of momentum that an item has depends upon two variables: how a lot of stuff is moving and how fast the stuff is moving.
Momentum is the force that exists in a shifting object. The momentum pressure of a moving item is calculated by way of multiplying its mass (weight) via its velocity (pace). Surely put, a 20-lb. rock going at 10 mph has lots more momentum force than a 3-lb. Ball going at the same speed.
Momentum is the pressure that exists in a transferring item. The momentum pressure of a shifting object is calculated with the aid of multiplying its mass (weight) by way of its velocity (velocity). Simply put, a 20-lb. Rock going at 10 mph has lots more momentum pressure than a three-lb. Ball going at equal speed. They're each associated with an item's pace (or speed) and mass, but momentum is a vector quantity that describes the amount of mass in motion. Kinetic power is a measure of an item's energy from movement and is a scalar.
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defination of dative covalent bond
In coordination chemistry,
A coordinate covalent bond also known as a dative bond, dipolar bond, or coordinate bond is a kind of two-center, two-electron covalent bond in which the two electrons derive from the same atom. The bonding of metal ions to ligands involves this kind of interaction.
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The atomic number of the element witch does not usually form compounds because it's outermost shell is full
The atomic numbers of elements with a filled outermost shell are 2, 10, 18, etc.
What are noble gases?
Noble gases are elements on the periodic table with filled outermost shells.
With filled outermost shells, these elements are not able to react in chemical reactions ordinarily.
These elements include Helium (2), Neon (10), Argon (18), etc.
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how many formula units of CaCl2 are in 111 g CaCl2? the molar mass of calcium chloride is about 111 g/mol
There are 6.02 × 10²³ formula units of CaCl2 in 111 g CaCl2. Details about formula units can be found below.
What is a formula unit?Formula unit refers to the empirical formula of an ionic compound for use in stoichiometric calculations.
According to this question, there are 111g of CaCl2. The formula units can be calculated by multiplying the number of moles by Avogadro's number.
no of moles in CaCl2 = 111g ÷ 111g/mol = 1mol
Formula units of CaCl2 = 1mol × 6.02 × 10²³ = 6.02 × 10²³ formula units.
Therefore, there are 6.02 × 10²³ formula units of CaCl2 in 111 g CaCl2.
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Please help Please help
What are the three important functions of the atmosphere ?
The atmosphere protects life on earth by shielding it from incoming ultraviolet (UV) radiation, keeping the planet warm through insulation, and preventing extremes between day and night temperatures.
What is the atmosphere?An atmosphere is the layers of gases surrounding a planet or other celestial body.
The three important functions of the atmosphere are:
1. The atmosphere protects life on earth by preventing it from incoming ultraviolet (UV) radiation.
2. The atmosphere keeps the planet warm through the insulation effect.
3. The atmosphere maintains extremes between day and night temperatures.
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A bicycle pump contains 250 mL of air at a pressure of 102 kPa. If the pump is
closed and the pressure increases to 2.25 atm, the new volume becomes
2.
Considering the Boyle's law, the new volume becomes 1,148,344.444 mL or 1148.34 L.
Boyle's lawBoyle's law relates pressure and volume, stating that the volume occupied by a given mass of gas at constant temperature is inversely proportional to pressure. This means that if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.
Boyle's law is expressed mathematically as:
P×V=k
Now it is possible to assume that you have a certain volume of gas V1 which is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and the following is true:
P1×V1=P2×V2
New volumeIn this case, you know:
P1= 102 kPa= 10335.1 atm (being 1 kPa= 101.325 atm)V1= 250 mLP2= 2.25 atmV2= ?Replacing in the Boyle's law:
10335.1 atm ×250 mL= 2.25 atm×V2
Solving:
(10335.1 atm ×250 mL)÷ 2.25 atm= V2
1,148,344.444 mL= 1148.34 L= V2
Finally, the new volume becomes 1,148,344.444 mL or 1148.34 L.
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The specific gravity of 10 ml of urine should be __________ the specific gravity of 10 ml of distilled water
The specific gravity of urine:
The specific gravity of 10ml of urine should be greater than the specific gravity of 10ml of distilled water.
What is specific gravity?
The comparison of the densities of solutes and water is done using specific gravity. Therefore, the following equation, where "D" stands for "density," can be used to represent particular gravity:
USG = [tex]\frac{D solutes}{Dwater}[/tex]
There are no units listed for specific gravity. A typical specific gravity value should range from 1.005 to 1.030. Accordingly, urine ought to be only a little bit denser than water. Low specific gravity is one with a value below 1.005, whereas a high specific gravity is one with a value above 1.030.
The density of the sample is increased by the presence of dissolved solutes in urine that are absent from distilled water.
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