The electron structures of hydrogen (H) and lithium (Li) are similar as " they both have 1 electron in an s sublevel".
What is sub-level?The quantum theory defines a sublevel as an energy level. Sublevels in chemistry refer to the energy caused by electrons. Sublevels can also relate to energy caused with the nucleus in physics.
It is know that the atomic number of hydrogen is 1 and the atomic number of lithium is 3.
The electronic configuration of H = [tex]1s^{1}[/tex].
The electronic configuration of Li = [tex]1s^{2} 2s^{1}[/tex].
Its can be seen that hydrogen and lithium both posses 1 electron in s sublevel
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what is the mass percentage for hydrogen
Answer:
The mass percent of hydrogen in hydrogen peroxide is 5.88
The mass percentage of hydrogen in water is 11.19 percent.
What are the two functional group present in the molecule
Answer:
carboxyl group (COOH) and amines
Explanation:
The two functional group present in the shown molecule are carboxylic acid group and amine group.
What are functional groups?Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.
The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.
Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.
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1. Ecosystems are composed of biotic and abiotic factors. Which of the following
represent only an abiotic factor in an ecosystem that could have an effect on
the ecosystem?
a. rivers with more dams
b. wood being taken for manufacturing
c. waste not being used by fungi
d. decomposers only taking nutrients from plants
Answer:
wood being taken for manufacturing
How are the atoms of carbon alike and different?
i need help answering this question on my homework, could anyone help?
What is the number of Co2 in a 220 gram
Which of the following best summarizes what happens in a displacement reaction?
A
Two elements react to form a compound.
B
A compound breaks down into elements.
C
An element and a compound react to form a different element and compound.
D
An element and a compound react to form another compound.
Answer:
C
Explanation:
Here's an example of displacement reaction:
2 Al (s) + 3 CuSO4 (aq) -> 3 Cu (s) + Al2(SO4)3 (aq)
note that aluminium and copper are elements,
copper II sulphate and aluminium sulphate are compound
The statement that best describes displacement reaction is an element and a compound react to form a different element and compound. The correct option is C.
What is displacement reaction?When a more reactionary element displaces, or continues to push out, a less reactive element from a compound containing the less reactive element, a displacement reaction occurs.
The less reactive element is now pure and uncombined following a displacement reaction.
A single-displacement reaction occurs when a more reactive element in a compound replaces a much less reactive element.
Metal displacement, hydrogen displacement, and halogen displacement are the three types of displacement reactions.
An element as well as a compound react to form a specific component and compound, according to the best description of displacement reaction.
Thus, the correct option is C.
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Question 11 of 25
Which functional group does the molecule below contain?
HIT
H-C-OH
H
A. Hydroxy
B. Ether
C. Amino
O D. Carbonyl
Carbonyl functional group contain molecule H-C-OH. Hence, option D is correct.
What is a functional group?A functional group is a group of atoms responsible for the reactions of a particular compound.
A carbonyl group contains a double bond linking a carbonyl carbon atom and a carbonyl oxygen atom. The carbonyl oxygen atom shares six valence electrons with the carbonyl carbon atom.
Hence, the carbonyl functional group contain the molecule H-C-OH.
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Answer:
A, hydroxyl
Explanation:
Just took the test on apex and the other answer was wrong and hydroxyl was correct
PPE 15. What variables are you manipulating in this exercise? Identify a symbol to represent each variable.
2HCl → H2 + Cl2
Is synthesis?
Answer:
It's decomposition
explanation:
Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation represents this violent reaction? O sodium hydroxide + water → Sodium + hydrogen O sodium + water → sodium hydroxide + hydrogen O sodium + hydrogen → sodium hydroxide + water O sodium + sodium hydroxide → Water + hydrogen
The word equation that represents the violent reaction between sodium and water is as follows: sodium + water → sodium hydroxide + hydrogen.
What is a chemical reaction?A chemical reaction is the process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.
According to this question, sodium (Na) and water (H2O) are involved in a chemical reaction to produce sodium hydroxide (NaOH) and hydrogen gas (H2).
Therefore, the word equation that represents the violent reaction between sodium and water is as follows: sodium + water → sodium hydroxide + hydrogen
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What happens to the electric force between two particles if the distance
between them is doubled?
Answer:
The size of the force varies inversely as the square of the distance between the two charges. Therefore, if the distance between the two charges is doubled, the attraction or repulsion become weaker, decreasing to one-fourth of the original value. ...The size of the force is proportional to the value of each charge.
An ionic substance is formed between a positively charged cation and a negatively charged anion. Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions. Which of the following substances are ionic? Check all that apply. Check all that apply. AlCl3 MgI2 C2H5OH NH3
Answer:
Which of the following substances are ionic?
Check all that apply.
AlCl3
MgI2
C2H5OH
NH3
Explanation:
An ionic substance is formed between a positively charged cation and a negatively charged anion.
Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions.
Among the given substances,
MgI2 is an ionic substance.
Since Mg is the metal atom. It forms a cation.
I is a nonmetal atom. It forms anion.
Hence,
MgI2 is an ionic substance.
Though AlCl3 looks like an ionic substance it is a covalent compound.
This is due to the high polarizability of [tex]Al^3+[/tex] ion.
The remaining two compounds do not contain any metal atoms.
So, ethanol and NH3 are not ionic compounds.
Answer:
MgI2
When a fuel is burned, any carbon that does not undergo combustion can be released as particles. What do we call this product?
Answer:
"soot" or "smoke" or "particulates" or "ash" or "carbon particulates"
Explanation:
The carbon that does not undergo combustion is released as particles. This particles are called soot or dust. Incomplete combustion also leads to the production carbon monoxide.
What is combustion ?Combustion is an exothermic process in which a gas reacts with the atmospheric oxygen producing carbon dioxide and water. This reaction involves heat to the surroundings.
Sometimes the combustion does not occurs completely. When there is insufficient oxygen for the fuel to completely react with the air to form carbon dioxide and water leads to incomplete combustion. It also occurs when a heat sink, such a solid surface or flame trap, extinguishes the combustion.
One of the byproducts of incomplete combustion is carbon monoxide. The typical incomplete combustion process releases carbon, which results in the formation of soot and dust.
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A sample of oxygen gas has volume 150.0 mL, at 0.947 atm, what will be the volume of the gas at 750.12 mm of Hg if temperature remain constant.
Answer:
143.9 mL
Explanation:
Applying,
PV = P'V'................. Equation 1
Where P = Initial pressure, V = Initial Volume, P' = Final pressure, V' = Final volume.
Make V' The subject of equation 1
V' = PV/P'............. Equation 2
From the question,
Given: P = 0.947 atm, V = 150 mL, P' = 750.12 mm of Hg = (750.12/760) = 0.987 atm,
Substitute these values into equation 2
V' = (0.947×150)/0.987
V' = 143.9 mL
WILL GIVE BRAINLIEST - A solution has a [H3O+] of 1 × 10−3 M. What is the [OH−] of the solution?
11 M
14 M
1 × 10−14 M
1 × 10−11 M
Answer:
The answer is 1 x 10 - 11 M. :))
Dos moléculas de Clorato de Potasio en estado sólido, al aplicarle calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso ¿como se representan?
Answer:
2KClO3 (s) -------> 2KCl (s) + 3O2 (g)
Explanation:
Una ecuación de reacción química es una representación simbólica de lo que sucede en un recipiente de reacción.
Al escribir la ecuación de reacción química para una reacción particular, se utilizan los símbolos químicos de todas las especies involucradas.
Por la reacción. en el cual dos moléculas de Clorato de Potasio en estado sólido, al aplicar calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso, la ecuación de reacción se escribe así;
2KClO3 (s) -------> 2KCl (s) + 3O2 (g)
La regla para escribir ecuaciones de reacción química balanceada es que el número de átomos de cada elemento en el lado derecho de la ecuación de reacción debe ser el mismo que el número b de átomos del mismo elemento en el lado izquierdo de la ecuación de reacción.
Si realizamos un conteo de átomos simple en ambos lados de la ecuación de reacción, la regla se cumple
The theoretical yield of NH3 is 945 grams. You conducted the experiment and only produced 598 grams.
Answer:
Given theoretical yield of NH3 is 945g.
The actual yield is 598g.
What is the %yield?
Explanation:
%yield of a chemical reaction can be calculated by using the formula:
[tex]%yield=\frac{actual yield}{theoretical yield} * 100[/tex][tex]\frac{actual yield}{theoretical yield} * 100[/tex]
Substitute the given values in this formula to get the %yield.
[tex]\frac{598g}{945g} * 100\\=63.3[/tex]
Hence, the %yield for the formation of ammonia is ---- 63.3.
What is the volume of a 0.25 M MgCl2 solution that contains 0.75 moles of MgCl2?
Answer:
The volume of the solution is 3 L.
Explanation:
Molarity is a measure of the concentration of that substance that indicates the number of moles per unit volume. In other words, molarity is the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.
[tex]Molarity=\frac{number of moles of solute}{solution}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}=M[/tex]
In this case:
Molarity= 0.25 Mnumber of moles of solute= 0.75 molesvolume= ?Replacing in the definition of molarity:
[tex]0.25 M=\frac{0.75 moles}{volume}[/tex]
volume*0.25 M= 0.75 moles
[tex]volume=\frac{0.75 moles}{0.25 M}[/tex]
volume= 3 L
The volume of the solution is 3 L.
If element A is in Group 13 and element B is in Group 17, which ions will be formed when A and B react together?
A3+ and B2-
A3+ and B-
A+ and B-
A2+ and B-
Answer:
A3+ and B-
Explanation:
Elements in group 13 have outermost electron configuration, ns2np1 hence they form trivalent positive ions.
Elements in group 17 have outermost electron configuration ns2np5 hence they form univalent negative ions.
This implies that, if element A is in Group 13 and element B is in Group 17, the ions formed are A3+ and B-.
Which of the following is not an amphoteric substance?
a) lead(II) oxide
b) aluminum hydroxide
C) iron(ill) oxide
d) zinc oxide
Sắt oxit
Explanation:
if you have 30 g of carbon, 300 g of chlorine and 30 g of hydrogen to form chloroform, how many grams of chlorine and hydrogen are used up in the reaction?
Explanation:
6×1.25×37.5= 281.5 g of chlorine
1×1.25×2= 2.5 g of hydrogen
3. Pretend you're a farmer and you want to grow more crops. You have three different
fertilizers to choose from. Design an experiment that will help you choose which
fertilizer is best.
a. What variables would you need to control in your experiment?
b. Which variable would you change to test the fertilizers?
C. What is the measurable data point for this experiment?
d. What would the procedure be for your experiment?
Answer:
A
Explanation:
What are the coefficients needed to balance this chemical reaction to show that matter is conserved?
Which sublevel contains valance electrons in an atom of magnesium (mg)?
A. 2s
B. 2p
C. 3s
D. 3p
Un método de laboratorio para preparar O 2 (g) consiste en la descomposición de KCIO 3 (s): KCIO 3 (s) KCI(s) + O 2 (g) a) ¿Cuántos moles de O 2 se producen cuando se descomponen 32,8 g de KCIO 3 ? b) ¿Cuántos gramos de KCIO 3 deben descomponerse para obtener 50 g de 02? c) ¿Cuántos gramos de KCI se forman al descomponerse KCIO 3 formándose 28,3 g de O2? 3. ¿Cuántos gramos de Ag 2 CO 3 deben haberse descompuesto si se obtuvieron 7511 g de Ag según la reacción: Ag 2 CO 3 Ag(s) + CO 2 (g) + O 2 (g)?
Answer:
2a. 0.401 moles de O2
b. 127.7g KClO3
c. 43.95g KCl
3. 9600g Ag2CO3 debieron haberse descompuesto
Explanation:
Basados en la reaccion:
2KCIO 3 (s) → 2KCI(s) + 3O 2
2 moles de KClO3 producen 3 moles de oxígeno:
a. 32.8g de KClO3 son:
Moles KClO3 -Masa molar: 122.55g/mol-
32.8g * (1mol / 122.55g) = 0.2676 moles KClO3
Moles O2:
0.2676 moles KClO3 * (3moles O2 / 2mol KClO3) =
0.401 moles de O2
b. 50g O2 son:
Moles O2 -Masa molar: 32g/mol-
50g O2 * (1mol/32g) = 1.5625 moles O2
Moles KClO3:
1.5625 moles O2 * (2mol KClO3 / 3mol O2) = 1.042 moles KClO3
Masa KClO3:
1.042 moles KClO3 * (122.55g/mol) =
127.7g KClO3
c. Las moles de O2 son:
28.3g O2 * (1mol / 32g) = 0.88 moles O2
Moles KCl:
0.88 moles O2 * (2mol KCl / 3mol O2) = 0.5896 moles KCl
Masa KCl -Masa molar: 74.55g/mol-
0.5896 moles KCl * (74,55g/mol) = 43.95g KCl
3. Basados en la reacción:
2Ag 2 CO 3 → 4Ag(s) + 2CO 2 (g) + O 2 (g)?
2 moles de Ag2CO3 reaccionan produciendo 4 moles de Ag. Las moles de Ag son:
Moles Ag -Masa molar: 107.8682g/mol-
7511g Ag * (1mol/107.8682g) = 69.63 moles Ag
Moles Ag2CO3:
69.63 moles Ag * (2moles Ag2CO3/4molesAg) = 34.82 moles Ag2CO3
Masa Ag2CO3-Masa molar: 275.7453g/mol-
34.82 moles Ag2CO3 * (275.7453g/mol) =
9600g Ag2CO3 debieron haberse descompuesto
What did Boyle conclude about elements like gold and lead?
Answer:What did Boyle conclude about elements like gold and lead?
Explanation:
Aristotle did not believe in the atomic theory and he taught so otherwise. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air. He believed all substances were made of small amounts of these four elements of matter.
please help bbg'sssss
Answer:
Explanation:
from the way the trees look, i would say A: Wind from the sky, it seems B: Clouds and in the distance C:Precipitation(rain)
The correct formula for finding the relative velocity of an object is:
Vac= vah-vыс
Valc = ab + b c
Vad = ab + b c
b c = ab + b c
Answer:
va/c = v a/b + v b/c
Explanation:
This is the correct formula for relative velocity
Given the reaction at equilibrium:
H2(g) + Cl2(g) → 2HCl(g) + heat
The equilibrium will shift to the right when there is an
increase in
A temperature
B pressure
C concentration of H2(g)
O concentration of HCl(g)
