To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The outermost electrons are called valence electrons and its energy is higher than the core electrons.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
The electrons that are in the outermost electron shell, also known as the valence electrons, have higher energy than those in the inner electron shells.
Therefore, the outermost electrons are called valence electrons and its energy is higher than the core electrons.
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When a racemic mixture is reacted with a single enantiomer of another compound, then a pair of _________ is formed.
When a racemic mixture reacts with a single enantiomer of another compound, then a pair of diastereomers are formed.
What is a racemic mixture?A racemic mixture is an equimolar composition of enantiomers are optically inert. On the right side and the left side of the enantiomer in a chiral molecule, they contain an equal amount.
Now, in an organic reaction:
When a racemic mixture reacts with a single enantiomer of another compound, two compounds are formed and their formation possesses the different configurations on each side. Hence, a pair of diastereomers are formed.
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The empirical formula of a chemical substance is CH₂. The
molar mass of a molecule of the substance is 56.108 g/mol.
What is the molecular formula of the chemical substance?
Answer:
Explanation:
Remark
CH2 provides the basic structure of the hydrocarbon. It will be multiplied by some factor determined by the number of grams / mol. I will use rounded numbers because all periodic tables are slightly different.
Theoretical mass of CH2
1 C = 1 * 12 = 12
2 H= 2 * 1 = 2
Mass CH2 = 14
The multiplier for CH2
56.108 rounded = 56
Multiplier = molar mass (rounded)/Mass CH2
Multiplier = 56/14 = 4
Chemical
(CH2)_4 = C4H8
Answer: C4H8
Magnesium combines with oxygen to form magnesium oxide. If 10.57 g of
magnesium reacts completely with 6.96 g of oxygen, what is the percent by mass of
oxygen and magnesium?
The total mass is 10.57+6.96=17.53 g.
So, the percent by mass of magnesium is (10.57)/(17.53) * 100 = 60.3%
The percent by mass of oxygen is (6.96)/(17.53) * 100 = 39.7%
This is the overall reaction of a mercury oxide dry cell:
Zn+ HgO —> ZnO + Hg
In this reaction, which example gets reduced?
O
HgO
Zn
Hg
Answer:
Hg gets reduced
(Look at the equation; notice how Hg loses O while Zn gains it)
Scientists observe that iron compounds are able to bind to nutrients in waterways experiencing eutrophication. Which change will most likely occur if iron compounds are added to a lake with an overabundance of nutrients? (1 point)
1. Fewer microorganisms will grow on the surface of the lake
2. More areas of hypoxia will occur in the lake.
3. More contaminated water will reach the lake.
4. Less sunlight will reach aquatic plants in the lake.
Which phrase best describes fracking?(1 point)
1. removing the top layer of an ore-bearing mountain to access oil and gas resources
2. using water and chemicals at high pressure to open up fissures to access oil and gas resources
3. using water and chemicals at high pressure to open up fissures to access mineral resources
4. removing the top layer of an ore-bearing mountain to access mineral resources
SOMEONE PLEASE HELP QUICK!!!
(1) Fewer microorganisms will grow on the surface of the lake if iron compounds are added to a lake with an overabundance of nutrients. Hence, option 1 is correct.
(2) Fracking means using water and chemicals at high pressure to open up fissures to access oil and gas resources. Hence, option 2 is correct.
What are microorganisms?An organism that can be seen only through a microscope.
Iron is a natural capping agent which can enhance sediment P binding capacity, thus reducing P availability and shifting a lake from an algal to a macrophyte dominated state. Iron could, however, also impose toxic effects on the biota.
Fracking is the injection of a fluid at high pressure into an underground rock formation to open fissures and allow trapped gas or crude oil to flow through a pipe to a wellhead at the surface.
This technique is used in natural gas and petroleum production.
1) Fewer microorganisms will grow on the surface of the lake if iron compounds are added to a lake with an overabundance of nutrients. Hence, option 1 is correct.
(2) Fracking means using water and chemicals at high pressure to open up fissures to access oil and gas resources. Hence, option 2 is correct
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a person who eats three servings of the cereal without milk will consume__ calories__ grams of carbohydrates
A person who eats three servings of the cereal without milk will consume about 117 percent of calories.
What is Calorie?This is defined as a unit of energy and is commonly used in the body system.
One serving of cereal without milk will contain 39 percent of calories while three servings will be 117 percent.
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Which method for treating arthritis is an example of pseudoscience?
Answer:
magnets
Explanation:
Pseudoscience is "a collection of beliefs or practices mistakenly regarded as being based on scientific method".. keyword: based; it is not science. It is merely a belief. Magnets are not scientifically confirmed as useful in arthritis treatment. There is only a belief that magnets can cure arthritis. So, the answer is magnets
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- profparis
Please help/show work!
how many grams of n2 has gave a volume of 11.2 liters at stp? ideal gas law
Answer:
7.00335g
Explanation:
[tex]n=\frac{V}{V_m} \\n = \frac{11.2}{22.4} \\n= 0.5 mol[/tex]
[tex]n=\frac{m}{M} \\m=nM\\m=(0.5)(14.0067)\\m=7.00335g[/tex]
Name each of the following compounds
a. MnS2
b. HClO4 (aq)
c. NH4C2H3O2
d. Li3N
e. Na2O2
Answer:
a. Manganese (IV) sulfide
b. Perchloric acid
c. Ammonium acetate
d. Lithium nitride
e. Sodium peroxide
Explanation:
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What activates a convenient current starting to flow of a fluid?
hlo guys you are so bads i
Which is the SI base unit for mass?
meter
pound
gram
foot
Answer:
[tex]gram[/tex]
Explanation:
ueuhe
What causes this nuclear reaction to occur
Answer:
bombarding it with an energetic particle
Explanation: nuclear reaction, a change in the identity or characteristics of an atomic nucleus, induced by bombarding it with an energetic particle. The bombarding particle may be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy-ion.
Emma rubs suntan lotion into her hands. At first her hands stay cool. After the cream is absorbed, her skin begins to get warm. Why do her hands stay cool while there is suntan lotion between them
Explanation:Suntan lotion basically evaporates. Sun tan lotion contains a chemical called acetone. So when the sun tan lotion is appilied, her hands feel cool, and as when it evporates in air it becomes warm again.
Additional information: Acetone is also found in Nailpolish remover, medicinal balms, sanitzers etc.
What phrase Best defines energy 
Answer:
the ability to do work.
Explanation:
how many grams of water would require 22000 joules of heat to raise its temperature from 34 C to 100 C. THe specific heat of water is 4.2 j/g C
The mass of water required to raise 22000 joules of heat from a temperature of 34°C to 100°C is 79.37g.
How to calculate mass?The mass of a substance can be calculated by using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature22000 = m × 4.2 × (100 - 34)
22000 = 277.2m
m = 22000/277.2
m = 79.37g
Therefore, the mass of water required to raise 22000 joules of heat from a temperature of 34°C to 100°C is 79.37g.
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a natrual distsater caused a population of 4,695 organisms to migrate to a new habitat. a few generations after the disaster it was observed that the new habitat did not sopport the survival of the species. the table shows the population of the species in two habitats
Answer:
49.54%
Explanation:
Given parameters:
Number of organisms in original habitat = 4695
Number of organism in new habitat = 2326
Solution:
To find the percentage of the organisms in the new habitat that has migrated to the new habitat, we use the expression below:
% of the population in the new habitat = x 100
% of the population in the new habitat = x 100 = 49.54%
Which refers to the amount of a solute that will dissolve in a given volume of solvent at a given temperature and pressure?
solubility
supersaturated
dissolution rate
concentrated
Answer:
A. Solubility
Explanation:
got it right on edge 2022
ladybug beetles chase, capture, and eat smaller insects called aphids. which best describes this relationship?
The relationship is predation. The ladybugs are the predators and the aphids are the prey.
What is predation?Predation is an interaction in which one organism, the predator, eats all or part of the body of another organism, the prey.
As per the information in the question, Ladybug beetles chase, capture, and eat smaller insects called aphids.This means that aphids act as food sources for Ladybug beetles.
Predation can be described as a biological interaction between two organisms belonging to two different species where one organism ( called predator) captures and consumes/eats another organism ( that is called prey).
Here, Ladybug beetles ( that capture and eat small insects) are predators and the insects are prey.
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Why isn’t K+ H2O —> KOH + H2 not balanced?
Answer:
The obtained result indicates that the hydrogen atom is not equal on both sides. Thus the reaction is not balanced.
Explanation:
In a calorimeter, a 1.0 g sample of magnesium is burned to form mgo. in doing so, 25.5 kj of energy are released. what is the molar enthalpy of combustion in kj/mol of magnesium?
question 2 options:
0.6324
1.54 x 1025
0.0392
620
25.5
The molar enthalpy of combustion in kj/mol of magnesium is 620 kj/mol, Option D is the correct answer.
What is enthalpy of Combustion ?The energy released when a fuel is oxidized by an oxidizing agent is called enthalpy of Combustion.
It is given that
a 1.0 g sample of magnesium is burned to form MgO. in doing so, 25.5 kj of energy are released.
Molecular weight of Magnesium = 24.35g
24.35 g makes 1 mole of Mg
1g = 1/24.35
For 0.04 moles 25.5 kJ is released
for 1 mole 25.5 *1/.04
= 620 kj/mol
Therefore the molar enthalpy of combustion in kj/mol of magnesium is 620 kj/mol.
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How many moles of NH3 are produced in the reaction of 3.3 moles of N2?
N2 + 3H2 = 2NH3
Answer:
6.6 moles of NH3
Explanation:
3.3 mol N2 * (2 mol NH3/ 1 mol N2) = 6.6 mol NH3
Which type of reaction does this diagram represent?
Answer:
Nuclear fission
Explanation:
Because the little particles are being spread out and the two elements are broken apart
IB Chemistry - Stoichiometry
In which mixture is NaOH the limiting reagent?
A. 0.20 mol NaOH + 0.10 mol H2SO4
B. 0.10 mol NaOH + 0.10 mol H2SO4
C. 0.20 mol NaOH + 0.10 mol HNO3
D. 0.10 mol NaOH + 0.10 mol HNO3
In which mixture of 0.10 mol NaOH + 0.10 mol [tex]H_2SO_4[/tex], NaOH is the limiting reactant. Hence option B is correct.
What is a limiting reagent?The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.
Reaction
[tex]2NaOH + H_2SO_4[/tex] → [tex]Na_2SO_4 + 2H_2O[/tex]
For one mole of [tex]H_2SO_4[/tex] we need two moles of NaOH.
Option A: equivalent quantities
Option B: NaOH is limiting rectant.
[tex]NaOH + HNO_3[/tex] → [tex]NaNO_3+ H_2O[/tex]
For one mole of [tex]HNO_3[/tex] we need one mole of NaOH.
Option C: NaOH in excess
Option D: equivalent quantities
In which mixture of 0.10 mol NaOH + 0.10 mol [tex]H_2SO_4[/tex], NaOH is the limiting reactant. Hence option B is correct.
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What is the percentage by volume of 30.0 mL ethanol (C2H6O) dissolved in 150.0 mL water (H2O)?
16.7 %
20 %
83.3 %
15 %
Answer: 16.7 %
Explanation:
[tex]\frac{30.0}{150.0+30.0}=\boxed{16.7\%}[/tex]
covers 70 precent of earths surface
Answer:
Water covers 70 percent of earth's surface.he hybridization of one s and one p orbital will result in the formation of _____ sp hybrid orbitals. This will leave _____ unhybridized p orbital(s), which is/are at right angles to the hybrid orbitals. The formation of a group of sp2 hybrid orbitals leaves _____ unhybridized p orbital(s). Multiple choice question. two; two; no two; two; one three; two; one one; two; one
The complete statement is "The hybridization of one s and one p orbital will result in the formation of two sp hybrid orbitals. This will leave two unhybridized p orbital(s), which is/are at right angles to the hybrid orbitals. The formation of a group of sp2 hybrid orbitals leaves one unhybridized p orbital(s). " Option B. This is further explained below.
What is hybridization?Generally, hybridization is simply defined as hybridization describes the offspring produced when one species of plant or animal mates with another.
In conclusion, After a cluster of sp2 hybrid orbitals forms, there is still one p orbital that is not hybridized (s).
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Is Los Angeles affected by ocean acidification?
Answer:
No son los angeles pero en realidad....
Explanation:
¿Qué provoca la acidificación de los océanos?
Cuando el CO2 es absorbido por el océano, se producen reacciones químicas. En particular, se forma ácido carbónico y se liberan iones de hidrógeno; como resultado, el pH de las aguas superficiales del océano disminuye, haciéndolas más ácidas.
explain what might happen to an organism if it could not adapt to an external change.
Answer:
it would slowly die off and the kinda of animal will not be there because it cant live there because they cant adapt to stay alive
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What does it mean for a strong base to be in equilibrium?
o the position of equilibrium lies far to the right, with products being favored.
o the position of equilibrium lies far to the left, with products being favored.
there is a great deal of base and very few ions.
o there is an equal amount of reactants and products.
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The position of equilibrium lies far to the right, with products being favoured. Hence, option A is correct.
What is equilibrium?Chemical equilibrium is a condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.
A very high value of K indicates that at equilibrium most of the reactants are converted into products.
The equilibrium constant K is the ratio of the concentrations of products to the concentrations of reactants raised to appropriate stoichiometric coefficients.
When the value of the equilibrium constant is very high, the concentration of products is much higher than the concentration of reactants.
This means that most of the reactants are converted into products and the position of equilibrium lies far to the right, with products being favoured.
Hence, option A is correct.
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Substance x is known to exist at 1 atm in the solid, liquid , or vapor phase, depending on the temperature. additionally, the values of these other properties of xhave been determined
Substance x is known to exist at 1 atm in the solid, liquid, or vapor phase, depending on the temperature, is mathematically given as
Q=800J.mol^{-1}
What is a graph of the other properties of x?Generally, the equation for heat absorbed is mathematically given as
Q= Heat capacity of solid *T
In conclusion,
Q= (40)(293.15-273.15)
Q=800J.mol^{-1}
In conclusion, Because the enthalpy of fusion is 9 KJmol-1 and we are only providing 6 KJmol-1 of heat, the melting process will not be complete. the graph is attached.
CQ
Substance x is known to exist at 1 atm in the solid, liquid, or vapor phase, depending on the temperature. additionally, the values of these other properties of x have been determined. show graph
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