Answer:
Explanation:
Number of moles of Cl atoms in 1.20 1024 Formula units of magnesium chloride mgcl2
The number of moles of Cl is twice as much, because the ratio of Cl in MgCl2 to MgCl2 is 2:1. Therefore, there are 12 moles of Cl. There are 7.22×1024 atoms Cl in 3.61×1024 formula units of MgCl2
The number of grams in 4.26 × 10²⁴ formula units of MgCl₂ is equal to 673.06 grams.
What is the relation between moles and mass?Mass of any substance from moles will be calculated by using the below equation as:
n = W/M, where
W = given mass
M = molar mass
And relation between moles and atoms per moles is:
In 1 moles = 6.022 × 10²³ atoms are present
Given number of atoms of MgCl₂ = 4.26 × 10²⁴
Moles of MgCl₂ = 4.26 × 10²⁴atoms / 6.022 × 10²³ atoms/mol = 7.07 mol
Non we convert this moles of MgCl₂ into grams by using the above given formula as:
W = (7.07mol)(95.2g/mol) = 673.06 g
Hence required mass of MgCl₂ is 673.06g.
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Will give Brainliest!!! Will award answer! The following reaction shows the products when sulfuric acid and aluminum hydroxide react.
2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O
The table shows the calculated amounts of reactants and products when the reaction was conducted in a laboratory.
Initial Mass and Yield
Sulfuric Acid Aluminum Hydroxide
Initial Amount of Reactant 40 g 45 g
Theoretical Yield of Water from Reactant 14.69 g 31.15 g
Thank you for helping me learn about chemistry and apply skills.
What is the approximate amount of the leftover reactant? (4 points)
20.89 g of sulfuric acid
22.44 g of sulfuric acid
21.22 g of aluminum hydroxide
23.78 g of aluminum hydroxide
Answer:
23.78 Grams of Aluminum Hydroxide
Explanation:
The table show the amount of reactants and products. The approximate amount of the leftover reactant is 23.78 g of aluminum hydroxide.
What is aluminum hydroxide?Aluminum hydroxide is present in nature as a gibbet. It has many side effects on humans, like nausea, vomiting, etc.
The reaction is [tex]\rm 2Al(OH)_3 + 3H_2SO_4 → Al_2(SO_4)_3 + 6H_2O[/tex]
Thus, the correct option is D, 23.78 g of aluminum hydroxide.
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In the solution containing both 0.10 M acetic acid and 0.10 M sodium acetate, the acetic acid undergoes ionization. The chemical equation for this ionization reaction is the same as for a solution containing acetic acid alone. The difference is that the initial concentration of acetate ion (before any ionization reaction occurs) for the solution containing acetic acid alone is zero, whereas the initial concentration of acetate ion is 0.10 M in your solution containing both acetic acid and sodium acetate. Calculate the percent ionization and the expected initial pH for the solution that contained both 0.10 M acetic acid and 0.10 M sodium acetate. (Hint: Again, you will need to use Ka for acetic acid.)
Answer:
percent ionization = 50.01%; pH = 4.75
Explanation:
To solve this question we must write the acetic acid equilibrium (Where HX will be acetic acid and X⁻ the sodium acetate):
HX(aq) ⇄ H⁺(aq) + X⁻(aq)
Where equilibrium constant, Ka, is defined as:
Ka = 1.76x10⁻⁵ = [H⁺] [X⁻] / [HX]
Where the concentration of each ion is:
[H⁺] = X
[X⁻] = 0.10M + X
[HX] = 0.10M - X
Replacing in Ka expression:
1.76x10⁻⁵ = [X] [0.10-X] / [0.10+X]
1.76x10⁻⁶ + 1.76x10⁻⁵X = 0.10X - X²
X² - 0.0999824 X + 1.76×10⁻⁶ = 0
X ≈ 0.1M → False solution. Decreases a lot the concentration of HX
X = 0.0000176M → Right solution.
The concentration of each ion is:
[H⁺] = 0.0000176062M
[X⁻] = 0.10M + 0.0000176M = 0.1000176M
[HX] = 0.10M - 0.0000176M = 0.0999824M
Percent ionization:
[X-] / [X-] + [HX] * 100 =
0.1000176M / 0.2M =
50.01%And pH = -log [H+]
pH = 4.75As you can see, [H+]≈ Ka
If brainly never existed where would you be right now?
Answer: To be honest I’ll be watching the television or doing interesting and education things like reading books and learning...
Answer:
SLEEPING,NAPPING, LAYING DOWN
Explanation:
How can catastrophic events impact ecosystems? Give at least 4 examples. Use complete sentences.
The loss of plants caused by a tornado can allow new species of plants to grow in the cleared area. Plants that survive can grow more abundantly then other species. This loss of vegetation could also lead to soil erosion.
Negative impacts of catastrophic events on ecosystem are damage to habitats, loss of biodiversity, erosion of soil and an increased risk from wildfires.
What are catatrophic events?Catastrophic events are situations where destruction occur in an environment. It can be man made or natural. Due to catastrophic events, the Earth is maintaining equilibrium.
So we can conclude that damage to habitats, loss of biodiversity, erosion of soil and an increased risk from wildfires are the negative impacts of catatrophic events.
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A car accelerates away from the starting line at 3.6 m/s2 and has the mass of 2400 kg. What is the net force acting on the vehicle?
Answer:
F = m x a
F = 2400 kg x 3.6 m/s2
F = 8,640 N
Explanation:
Which of the following is an base?
OK₂CO₃
ОНЕ
NaCl
NaOH
Answer:
NaOH
Explanation:
NaOH is called base because it dissociates completely in aqueous solution to form hydroxide ion(OH-) and sodium cation (Na+). When it react with an acid , it produce sodium salt and water. It is a strong base because it dissociates completely.
सच्याउंन आधानिक परियोडिक तालिका सफल भयो वा भएन, मूल्याङ्कन गनुहोस्
List out two demerits of Mendeleev's period table. Analyses modern penodic
table is able to overcome these dements or not.
दिदाको तालिका अध्ययन गरी सोधिएका प्रश्नहरुका उत्तर लेख्नुहोस्
Answer:llllIIII
Explanation:
How many atoms would fit across a human hair? *
The amount of atoms one million carbon atoms or so make up an average human hair.
What are atoms?The smallest unit of matter that may be divided without ejecting electrically charged particles is called an atom. It is also the smallest material with properties resembling chemical elements. As a result, the atom serves as the fundamental unit of chemistry. In a chemical reaction, atoms cannot be formed or destroyed since they are indivisible units.
One inch has 25,400,000 nanometers. The width of a human hair ranges between 80,000 and 100,000 nanometers. The thickest human hair is a million times smaller than an atom. An atom's diameter spans from 0.1 to 0.5 nanometers. The volume of the cells is typically 0.009 cubic microns. More than 150,000 of these germs could fit on the tip of a human hair, and about 150 of them could fit within one Escherichia coli cell.
Thus, the amount of atoms one million carbon atoms or so make up an average human hair.
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a. Identify which sets of quantum numbers are valid for an electron. Each set is ordered (n,ℓ,mℓ,ms).
Check all that apply.
3,1,-1,1/2
1,1,0,1/2
1,-1,-1,-1/2
2,1,-1,-1/2
3,0,0,1/2
0,2,1,-1/2
3,2,1,-1
4,3,3,-1/2
3,2,2,1/2
3,3,-1,1/2
4,3,-4,1/2
2,2,1,1/2
b. Consider the addition of an electron to the following atoms from the fifth period. Rank the atoms in order from the most negative to the least negative electron affinity values based on their electron configurations.
Atom or ion Electron configuration
I [Kr]4d105s25p5
Sn [Kr]4d105s25p2
Xe [Kr]4d105s25p6
Required:
Rank the electron affinity from most negative to least negative. To rank items as equivalent, overlap them.
Answer:
a. Values are - (1) 3,1,-1,1/2 (2) 2,1,-1,-1/2 (3) 3,0,0,1/2 (4) 4,3,3,-1/2
(5) 3,2,2,1/2
b. Order be- I > Sn > Xe
Explanation:
a.
Valid quantum numbers are -
'l' value should be less than 'n' value and 'ml' value should be '-l' to 'l'
'ml' value should not more than 'l' or 'n'.
Values are -
3,1,-1,1/2
2,1,-1,-1/2
3,0,0,1/2
4,3,3,-1/2
3,2,2,1/2
b.
Given that-
I [Kr]4d¹⁰5s²5p⁵
Sn [Kr]4d¹⁰5s²5p²
Xe [Kr]4d¹⁰5s²5p⁶
Order be-
I > Sn > Xe
Xe is least because it is completely filled outer shell (5s²5p⁶
Determine whether each phrase describes carboxylic acids or esters.
Usually have a sour odor____.
Form hydrogen bonds amongst themselves and have lower vapor pressure____.
Do not form hydrogen bonds amongst themselves and have higher vapor pressure____.
Notable for their pleasant fragrances____.
Their reactions with base are known as saponifications____.
Their reactions with base are known as neutralizations____.
Answer:
Carboxylic acids produce hydrogen bonds amongst themselves and possess lower vapor pressure. They generally possess a sour odor. When an acid and a base react with each other to produce salt and water and comprises the combination of hydrogen and hydroxide ions, the reaction is termed the neutralization reaction. Thus, when carboxylic acid reacts with base the reaction is termed neutralization.
On the other hand, esters are known for their pleasant fragrances. They do not produce hydrogen bonds amongst themselves and possess higher vapor pressure. A hydration reaction in which free hydroxide dissociates the ester bonds between the glycerol and fatty acids of a triglyceride, leading to the formation of free fatty acids and glycerol is termed saponification.
Thus, the given blanks can be filled with carboxylic acid, carboxylic acid, esters, esters, esters, and carboxylic acid.
A hammer can be used to see how a mineral breaks. If you observe square chunks of the mineral when broken, what can you conclude?
a
The mineral is soft.
b
The mineral is hard.
c
The mineral has cleavage.
d
The mineral does not have cleavage.
Answer:
a
Explanation:
it can not break that easily
The mineral has given square chunks when breaked with a hammer. This indicates that the mineral has a cleavage. Thus, option c is correct.
What is mineral?Minerals are naturally formed inorganic substances which are having a definite chemical composition and highly ordered crystalline structures. Minerals are deposited in many organic and inorganic matters.
Minerals have some peculiarities such as hardness, cleavage, color etc. Cleavage of a mineral is its tendency to break along crystallographic planes thereby the structural locations of ions and atoms in the crystal creates planes of relative weakness.
Cleavage of crystal results in pieces of square, cubic or other geometrical shapes. in The mineral here, broken into square pieces indicating that the mineral have some weaker crystallographic planes in comparison to other and they cleave. Thus, c is correct.
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What is the oxidation state of the underlined atom in the reaction: NaHCO3 + HCl = NaCl + CO2 + H2O
underlined is the Na in NaHCO3
Answer:
+1
Explanation:
Let's consider the following equation.
NaHCO₃ + HCl ⇒ NaCl + CO₂ + H₂O
To determine the oxidation number of Na in NaHCO₃ we will use the following rule: the sum of the oxidation number of the elements present in a compound is equal to this charge. For this compound we know:
The oxidation number of H is +1.The oxidation number of C is +4.The oxidation number of O is -2.The charge of the compound is zero (neutral compound)Na + H + C + 3 O = 0
Na + (+1) + (+4) + 3 (-2) = 0
Na = +1
If 10.00 moles of copper are reacted with 6.00 moles of sulfur according to the following balanced equation, which reactant is the limiter and how many moles of excess reactant would remain after the reaction is completed? 2 Cu + S --> Cu2S
Cu is limiting and 1.00 mole of excess S remain
S is limiting and 1.00 moles of excess Cu remain
S is limiting and 4.00 moles of excess Cu remain
Cu is limiting and 4.00 moles of excess S remain
Answer: Cu is limiting and 1.00 mole of excess S remain
Explanation:
The chemical balanced reaction is:
[tex]2Cu+S\rightarrow Cu_2S[/tex]
According to stoichiometry :
2 moles of [tex]Cu[/tex] require 1 mole of [tex]S[/tex]
Thus 10.00 moles of [tex]Cu[/tex] will require=[tex]\frac{1}{2}\times 10.00=5.00moles[/tex] of [tex]S[/tex]
Thus [tex]Cu[/tex] is the limiting reagent as it limits the formation of product and [tex]S[/tex] is the excess reagent.
Moles of S left = (6.00-5.00) moles = 1.00 mole
Thus Cu is limiting and 1.00 mole of excess S remain.
How many electrons can a 5d sublevel hold?
Answer:
I think it's 10 electrons
Answer:
10 electrons I believe
Explanation:
5 atomic orbitals in 5d sublevel x 2 electrons/orbital = 10 electrons can reside in the 3d sublevel.
Identify the kind(s) of intermolecular forces that would occur between the solute and solvent in an acetic acid (which is polar and contains an OHOH group) solution. Check all that apply. Check all that apply. dispersion hydrogen bonding ion-dipole dipole-dipole
Explanation:
The acetic acid is a polar compound. The polar molecules have a positive and negative extreme for this reason they are dipoles. The dipoles can attract other dipoles or ions. So, it can establish ion-dipole and dipole-dipole forces with the solute. In addition, acetic acid has a hydroxyl group that can interact with hydrogens or other very electronegative atoms (oxygen, nitrogen and fluor) forming hydrogen bridge junctions.
Be sure to answer all parts. Write the unbalanced chemical equation to represent each of the following reaction statement. Do not include phase abbreviations. (a) Potassium hydroxide and phosphoric acid react to form potassium phosphate and water. (b) Zinc and silver chloride react to form zinc chloride and silver. (c) Sodium hydrogen carbonate reacts to form sodium carbonate, water, and carbon dioxide. (d) Ammonium nitrite reacts to form nitrogen and water. (e) Carbon dioxide and potassium hydroxide react to form potassium carbonate and water.
Answer:
See explanation
Explanation:
An unbalanced chemical equation does not show equal number of atoms of each element on both sides of the reaction equation.
a) KOH + H3PO4 -----> K3PO4 + 3H20
b) Zn + AgCl -------> ZnCl2 + Ag
c) NaHCO3 → Na2CO3 + H2O + CO2
d) NH4NO2 ------> N2 + H2O
e) CO2 + KOH -----> K2CO3 + H2O
The weather on Earth is influenced by the oceans, which store, release, and redistribute energy through evaporation. The source of this energy is–
A. solar radiation
B. gravitational attraction
C. density differences
D.chemical reactions
Which of the following is a large glycoprotein?
A. Antidiuretic hormone
B. Oxytocin
C. Follicle-stimulating hormone
D. Epinephrine
Answer:
B. Oxytocin
I think this is correct answer...
What is the total number of electrons in the valence shell of an atom of aluminum in the ground
state?
1)8 2)2 3)3 4)10
Answer:
This is a total of ten electrons in filled shells
Explanation:
What is the IUPAC name Of
CH3-CH2-CH2-CH=O
I
COOH
Answer:
Explanation:
It is Butanoic Acid
What is the pH of 0.42M aniline?
Answer:
Kb=x^2/0.42-x (eqn to calculate)
basicity (pkb) 9.3
Explanation:
How many grams of water can be formed from the reaction of 8.76 grams of H2 with 10.5 liters of O2 (at STP) according to the balanced equation: 2 H2 + O2 --> 2 H2O Express your answer to 3 sig figs. Do NOT include units!
Answer:
16.9g of H₂O can be formed
Explanation:
Based on the chemical reaction, 2 moles of H₂ react per mole of O₂. To anser this question we must find limiting reactant converting the mass and volume of each reactant to moles:
Moles H₂ -Molar mass: 2.016g/mol-:
8.76g * (1mol / 2.016g) = 4.345 moles
Moles O₂:
PV = nRT
PV/RT = n
P = 1atm at STP
V = 10.5L
R = 0.082atmL/molK
T = 273.15K at STP
n = 1atm*10.5L / 0.082atmL/molK*273.15K
n = 0.469 moles of oxygen
For a complete reaction of 4.345 moles moles of hydrogen are required:
4.345 moles H2 * (1mol O2 / 2mol H2) = 2.173 moles of O2 are required. As there are just 0.469 moles, Oxygen is limiting reactant
Now, 1 mole of O2 produce 2 moles of H2O. 0.469 moles will produce:
0.469 moles O₂ * (2 moles H₂O / 1mol O₂) = 0.938 moles H₂O.
The mass is -Molar mas H₂O = 18.01g/mol-:
0.938 moles * (18.01g/mol) =
16.9g of H₂O can be formed2 Which is NOT a function of the skeletal system? A. It gives support to your body. B. It protects your internal organs. C. Bones carry impulses to the nervous system. D. Muscles are attached to bones and help them move.
Answer:
C. Bones carry impulses to the nervous system.
Explanation:
hop this helps
X^2/3-5X^1/3+6=0
find x
Answer:
[tex]x=27,8[/tex]
Explanation:
The equation is
[tex]x^{\dfrac{2}{3}}-5x^{\dfrac{1}{3}}+6=0[/tex]
Let,
[tex]x^{\dfrac{1}{3}}=y[/tex]
So,
[tex]y^2-5y+6=0\\\Rightarrow y=\dfrac{-\left(-5\right)\pm \sqrt{\left(-5\right)^2-4\times 1\times 6}}{2\times 1}\\\Rightarrow y=3,2[/tex]
[tex]x^{\dfrac{1}{3}}=y\\\Rightarrow y^3=x\\\Rightarrow x=3^3\\\Rightarrow x=27[/tex]
[tex]x=2^3\\\Rightarrow x=8[/tex]
Hence, [tex]x=27,8[/tex].
Why is the conjugate acid of morpholine more acidic than the conjugate acid of piperidine? Why is the conjugate acid of morpholine more acidic than the conjugate acid of piperidine? The oxygen in morpholine withdraws electrons inductively, which makes protonated morpholine the stronger acid. The oxygen in morpholine does not withdraw electrons inductively, which makes protonated morpholine the stronger acid. The sp2 oxygen in morpholine is less electronegative than the sp2 carbon of piperidine, which makes protonated morpholine the stronger acid. The sp2 oxygen in morpholine is more electronegative than the sp2 carbon of piperidine, which makes protonated morpholine the stronger acid.
Answer:
The oxygen in morpholine withdraws electrons inductively, which makes protonated morpholine the stronger acid.
Explanation:
In Chemistry, acidity has to do with ease with which hydrogen ion is lost from a substance. Hence in a substance that has greater acidity, hydrogen ion is easily lost as a proton. This easy loss of hydrogen ion is usually caused by a particular reason which is related to the structure of the substance.
In comparing the acidity of protonated morpholine and piperidine, we find out that morpholine has an oxygen atom which withdraws electrons inductively thereby making the N-H bond in protonated morpholine weaker and enhances the loss of a hydrogen ion in protonated morpholine as a proton.
how are electrons arranged in molecules of compounds?
Answer:
electrons are always in the outer shell
When an electron moves, it absorbs or produces energy in the form of photons. Electrons surround the nucleus, which is made up of protons and neutrons, and they all form an atom. The exchange or sharing of electrons between atoms is the main cause of chemical bonding.
Hope this helps you :)
Identify the products formed in this Brønsted-Lowry reaction. HCO−3+HBrO↽−−⇀acid+base
Answer:
[tex]HCO^-_3+HBrO\rightleftharpoons H_2CO_3+BrO^-[/tex]
Explanation:
Hello there!
In this case, according to the Brønsted-Lowry theory of acids, it is possible to realize that HBrO acts as the Brønsted-Lowry acid as it has a free hydrogen to give away to HCO₃⁻ which acts as the Brønsted-Lowry base able to accept the incoming hydrogen; therefore, the Brønsted-Lowry reaction is:
[tex]HCO^-_3+HBrO\rightleftharpoons H_2CO_3+BrO^-[/tex]
Best regards!
In the Brønsted-Lowry reaction between HCO⁻₃ and HBrO, the formed acid is H₂CO₃ and the formed base is BrO⁻.
According to Brønsted-Lowry acid-base theory:
An acid is a substance that donates H⁺.A base is a substance that accepts H⁺.Let's consider the following Brønsted-Lowry reaction.
HCO⁻₃ + HBrO ⇄ acid + base
HBrO can only donate H⁺, so it is an acid.HCO⁻₃ can accept or donate H⁺. Here, it will accept the H⁺ donated by HBrO and behave as a base.The resulting reaction is:
HCO⁻₃ + HBrO ⇄ H₂CO₃ + BrO⁻
H₂CO₃ can donate H⁺ so it is an acid.BrO⁻ can accept H⁺ so it is a base.In the Brønsted-Lowry reaction between HCO⁻₃ and HBrO, the formed acid is H₂CO₃ and the formed base is BrO⁻.
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Match the lettered empty blanks in the following statements to the correct word that makes each statement true. When a compound dissolves in water to produce an aqueous solution, the compound is said to be Blank A in water. If an aqueous solution conducts electricity, then the solute is called a(n) Blank B. Group of answer choices Blank A [ Choose ] Blank B electrolyte
Answer:
1. Soluble.
2. Electrolyte.
Explanation:
Solubility is a term used to describe how readily a substance can be dissolved in a solvent to form a solution. Thus, a substance is said to be soluble if it dissolves completely in a solvent and insoluble if it doesn't dissolve or only dissolves partially.
For example, sodium chloride (NaCl) when mixed with water dissociates into sodium and chloride ions. Thus, salt (sodium chloride) is said to be soluble because it dissolves completely in water.
In Chemistry, dissolution can be defined as the process of dissolving or dissociating a solute in solid, liquid or gaseous phase into fragmented particles by a solvent in order to form a solution. For dissolution to occur in solids, the crystalline structure of the substance must be broken up so as to release ions, atoms or molecules to produce a solution. For liquid and gases, the substance to be dissolved must form a non-covalent bond with the solvent to produce a solution.
Hence, a compound that dissolves in water to produce an aqueous solution is said to be soluble in water. Also, the solute of an aqueous solution that conducts electricity is called an electrolyte.
Tin(II) fluoride is added to some dental products to help
prevent cavities. Tin(II) fluoride is prepared according
to the following equation:
Sn(s) + 2HF(aq) → SnF2(aq) + H2(g)
How many grams of tin(II) fluoride can be produced
from 55.0 g of hydrogen fluoride if there is plenty of tin
available to react?
Step 1: Calculate the molar mass of HF and SnF₂.
For HF
molar mass = (1.008 g/mol × 1) + (19.00 g/mol × 1)
molar mass = 20.008 g/mol
For SnF₂
molar mass = (118.7 g/mol × 1) + (19.00 g/mol × 2)
molar mass = 156.7 g/mol
Step 2: Determine the mole ratio needed.
mole ratio = 2 mol HF : 1 mol SnF₂
Step 3: Calculate the mass of SnF₂ produced by using the mole ratio.
[tex]\text{mass of SnF₂ = 55.0 g HF} × \frac{\text{1 mol HF}}{\text{20.008 g HF}} × \frac{\text{1 mol SnF₂}}{\text{2 mol HF}} × \frac{\text{156.7 g SnF₂}}{\text{1 mol SnF₂}}[/tex]
[tex]\boxed{\text{mass of SnF₂ = 215.4 g}}[/tex]
A common ancestor is an organism that is the
O direct ancestor of two or more different organisms
O direct ancestor of one organism.
O indirect ancestor of two or more different organisms.
O indirect ancestor of one organism.
A common ancestor is an organism that is the direct ancestor of two or more different organisms.
A common ancestor refers to an organism that is shared by multiple organisms, serving as the direct predecessor to those organisms. It is the point in evolutionary history where two or more distinct lineages diverged from a single ancestral lineage. This means that the common ancestor is the starting point from which different species or groups of organisms evolved over time.
In the context of evolution, organisms share common ancestry due to the process of descent with modification. Through genetic inheritance and gradual changes in traits over generations, new species arise from a common ancestor. As these species undergo divergent evolution, they develop distinct characteristics and adaptations, eventually becoming separate lineages.
Hence, the correct option is the direct ancestor of two or more different organisms.
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