Answer:
See Explanation
Explanation:
Number of moles of NaOH = 0.3868 L × 1.707 M = 0.660 moles
Reaction of Al^3+ and OH^-
Al^3+(aq) + 3OH^-(aq) -----> Al(OH)3(s)
If 1 mole of Al3+ reacts with 3 moles of OH^-
x moles of Al^3+ reacts with 0.660 moles of OH^-
x = 1 × 0.660/3
x= 0.22 moles
Mass of Al^3+ = 0.22 moles × 27 g/mol = 5.94 g of Al^3+
Co^2+(aq) + 2OH^-(aq) ----> Co(OH)2(s)
1 mole of Co^+ reacts with 2 moles of OH^-
x moles of Co^2+ reacts with 0.660 moles of OH^-
x = 1 × 0.660/2 = 0.33 moles
Mass of Co^2+ = 0.33 moles × 59 g/mol = 19.47 g
The pH of the ocean is 8.1. What is the concentration of hydronium ions?
Answer:
7.9 × 10⁻⁹ M
Explanation:
Step 1: Given data
pH of the ocean: 8.1
Step 2: Calculate the concentration of hydronium ions
We will use the definition of pH.
pH = -log [H⁺] = -log [H₃O⁺]
[H₃O⁺] = [H⁺] = antilog -pH
[H₃O⁺] = antilog -8.1 = 7.9 × 10⁻⁹ M
Since [H₃O⁺] < 10⁻⁷ M, the solution is basic.
How many molecules are in 4.44 mol of CF4? 4.44 mol CF4 =
I am not sure abt the ans
molar mass= 88
1 molecule = 6.022×10^23
4.44 moles = 6.022×10^23×4.44/88
= 26.73768 × 10^23/88
= 0.3038372727 ×10^23
Which example shows a double replacement reaction?
Answer:
KCl + AgNO₃ —> AgCl + KNO₃
Explanation:
To answer the question correctly, we must understand the definition of a double displacement reaction.
A double displacement reaction is a reaction in which the ions of the two reacting compounds exchange to form new compounds different from the two reacting compounds. Example is given below:
XY + AB —> XB + AY
Considering the options given in the question above, only the equation:
KCl + AgNO₃ —> AgCl + KNO₃
Satisfy the definition of a double displacement reaction.
Define solubility. the amount of a substance that will dissolve in a given amount of solvent a solid mixed with another solid a liquid that does not dissolve in another liquid the amount of a substance that will dissolve in a given amount of solute a solid that does not dissolve in a gas
Answer:
You answered your own question
The solubility of a substance is the amount of the substance that can be dissolved in a given amount of solvent at a specified temperature. Hence, option A is correct.
What is solubility ?Solubility of a substance can be defined as the fraction of concentration of the substance which can be dissolved in a particular amount of a solvent at a specified temperature.
Solubility of a substance depends on the bond type, temperature, pressure and presence of impurities if any. If the bond strength is greater, less will be the solubility because, greater energy is needed to weaken the bonds in the salt.
Similarly, for most of the salts, as the temperature increases, solubility increases, but some salt's solubility is independent of the temperature such as for NaCl. Therefore, the correct definition of solubility is option A.
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Which additional product balances the reaction h2so4+2naoh>na2so4
Answer:
H 4so8 is the answer of balance the reaction
what will happen to the initial rate of the reaction if the concentration of iron(III) chloride is tripled
Answer:
Concentration and reaction rate is directly proportional
Explanation:
Basically, concentration is directly proportional to the concentration, so the higher the concentration, the higher the reaction rate.
Once the concentration is increased, more chemical will be added hence the reaction rate will increase
g Draw the most stable chair conformation for each of the following compounds (a) Cis-1-ethyl-2-methyl cyclohexane (b) Trans-1-ethyl-2-methyl cyclohexane (c) Which one is more stable, a or b
Answer:
See explanation
Explanation:
Image 1 is the chair conformation of trans-1-ethyl-2-methyl cyclohexane while image 2 is the chair conformation of Cis-1-ethyl-2-methyl cyclohexane.
Now let us look at the two structures closely. In the chair conformation, the more stable structure is the structure that has the bulky groups placed in the equatorial position.
Clearly, in trans-1-ethyl-2-methylcyclohexane, the ethyl and methyl groups are found to be in equatorial positions. Hence, trans-1-ethyl-2-methylcyclohexane is more stable in the chair conformation than cis-1-ethyl-2-methyl cyclohexane which has its methyl and ethyl groups in axial position.
Why should a science teacher know how to prepare stock solution
Answer:
because they were thought in college
Explanation:
hope that helps
Which of the following is most likely to make a -3 ion?
Bі
P
Se
Be
All
The element whose atom may likely make a -3 ion is P.
Elements in the periodic table are classified into groups and periods. The elements in the same group have similar physical and chemical properties.
Phosphorus (P) is a member of group 15 in the periodic table. The most common ion formed by the members of this group is the -3 ion.
It is formed by accepting three electrons to complete their octet since they have five electrons on their outermost shell.
Hence P is most likely to form a -3 ion.
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What is the pH of a 0.086 M HCl solution?
Answer: pH = 1.066
Explanation: HCl is strong acid and it protolyzes totally:
HCl + H2O ⇒ H3O+ + Cl-
Concentrations are same: [H3O+] = c(HCl)
pH = - log[H3O+] = - log(0.086) = 1.0655
Carbon 14 and carbon 12 are both isotopes of the element carbon check all answers that are true about them
Answer:
CARBON 14 INCLUDES:
-six protons
-eight neutrons in the nucleus
CARBON 12 INCLUDES:
-six protons
-Six neutrons
Calculate the number of cations and anions in each of the following compounds. Enter your answers in scientific notation. (a) 6.42 g of KBr:
Answer: The number of cations are [tex]3.24 \times 10^{22}[/tex] and number of anions are [tex]3.24 \times 10^{22}[/tex] in 6.42 g of KBr.
Explanation:
The molar mass of KBr is (39.10 + 79.90) g/mol = 119.00 g/mol
Now, the dissociation equation for KBr is as follows.
[tex]KBr \rightarrow K^{+} + Br^{-}[/tex]
This means that 1 mole of KBr is forming 1 mole of [tex]K^{+}[/tex] (cation) and 1 mole of [tex]Br^{-}[/tex] (anion).
According to mole concept, 1 mole of every substance contains [tex]6.022 \times 10^{23}[/tex] atoms. Hence, number of cations present in 6.42 g KBr is calculated as follows.
[tex]No. of cations = Moles \times 6.022 \times 10^{23}\\= \frac{mass}{molar mass} \times 6.022 \times 10^{23}\\= \frac{6.42 g}{119.00 g/mol} \times 6.022 \times 10^{23}\\= 3.24 \times 10^{22}[/tex]
As according to the equation, there are equal number of moles of both cation and anions.
This means that the number of anions are also [tex]3.24 \times 10^{22}[/tex].
Thus, we can conclude that the number of cations are [tex]3.24 \times 10^{22}[/tex] and number of anions are [tex]3.24 \times 10^{22}[/tex] in 6.42 g of KBr.
The number of cations and anions present in potassium bromide is 3.24 × 10²².
How we calculate atoms from moles?In one mole of any substance 6.022 × 10²³ atoms of that substance is present and this is known as Avogadro's number.
KBr is a strong electrolyte means it fully dissociates into their constitute ions. So, the number of moles of produced ions is equal to the moles of KBr and dissociation is represented as:
KBr → K⁺ + Br⁻
From this it is clear that 1 mole of cation and 1 mole of anion is produced from 1 mole of KBr. Moles of KBr will be calculated as:
n = W/M, where
W = given mass = 6.42g
M = molar mass = 119
n = 6.42 / 119 = 0.053 moles
No. of cations and anions present in 0.053 moles = 0.053 × 6.022 × 10²³ = 3.24 × 10²².
Hence, 3.24 × 10²² is the no. of cations and anions.
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You are working on a project where you need the volume of a box. You take the length, height, and width measurements and then multiply the values together to find the volume. You re- port the volume of the box as 0.310 ml. If two of your mea- surements were 0.7120 m and 0.52458 m, what was the other measurement?
Answer and Explanation:
If we remember from school, we should know that the equation for finding the volume of a box (rectangular) is length times width times height.
Since we know the volume, we can divide the two sides given from the volume to find the remaining side.
0.310 ÷ 0.7120 ÷ 0.52458 = 0.83
The answer is 0.83 for the remaining side measurement.
#teamtrees #PAW (Plant And Water)
Answer:
The answer is: 0.82998448
Explanation:
If you multiply 0.7120 × 0.52458, it will equal: 0.37350096.
if you divide 0.310 ÷ 0.37350096, you will get 0.82998448.
Hope it helps!!
(also, i don't want to be "that" person, but brainliest would be apreciated!)
how do i convert 145.6grams of Iron sulphide into iron and sulfur
A diamond can make permanent marks on glass. It can also cut glass. Most other materſals cannot do this.Which property of a diamond allows it to make cuts or marks on glass? a. Hardness b. Heaviness c. Roughness d. transparency
Calculate the pH of a buffer solution prepared by mixing 75.0 mL of 1.25 M lactic acid and 40.0 mL of 0.75 M sodium lactate. (The pKa for lactic acid is 3.86. The molar mass for lactic acid is 90.1 g/mol and the molar mass for sodium lactate is 112.1 g/mol.)
Answer:
pH = 3.37
Explanation:
A weak acid as lactic acid in a solution with sodium lactate (Its conjugate base) produce a buffer. The pH of this buffer is obtained using H-H equation:
pH = pKa + log [A-] / [HA]
Where pH is the pH of the buffer,
pKa is 3.86
And [] could be taken as the moles of A- = Sodium lactate and HA = Lactic acid.
Moles A-:
40.0mL = 0.0400L * (0.75mol / L) = 0.030 moles A-
Moles HA:
75.0mL = 0.0750L * (1.25mol / L) = 0.09375 moles HA
Replacing:
pH = 3.86+ log [0.030 moles A-] / [0.09375 moles HA]
pH = 3.37
PLEASE HELP NEED IT ASAP
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:
1 × 10−11 M
Explanation:
I took the test :) guy above me is right
Show the complete ionic equation and net ionic equation for all the equations below, then state whether or not a precipitate (insoluble compound) will form. To receive full credit, you must show ALL your work.
Cacl2(aq) + K2co3(aq) + -------->
Bacl2(aq) + MgSO4(aq) + -------->
AgNO3(aq) + Kl(aq) →
Nacl(aq) + (NH4)2Cro4(aq) →
Answer:
(a): Precipitate of calcium carbonate will form.
(b): Precipitate of barium sulfate will form.
(c): Precipitate of silver iodide will form.
(d): Precipitate of sodium chromate will form.
Explanation:
Complete ionic equation is defined as the equation in which all the substances that are strong electrolytes present in an aqueous state and are represented in the form of ions.
Net ionic equation is defined as the equations in which spectator ions are not included.
Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.
(a):
The balanced molecular equation is:
[tex]CaCl_2(aq)+K_2CO_3(aq)\rightarrow 2KCl(aq)+CaCO_3(s)[/tex]
The complete ionic equation follows:
[tex]Ca^{2+}(aq)+2Cl^-(aq)+2K^+(aq)+CO_3^{2-}(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+CaCO_3(s)[/tex]
As potassium and chloride ions are present on both sides of the reaction. Thus, they are considered spectator ions.
The net ionic equation follows:
[tex]Ca^{2+}(aq)+CO_3^{2-}(aq)\rightarrow CaCO_3(s)[/tex]
Precipitate of calcium carbonate will form.
(b)
The balanced molecular equation is:
[tex]BaCl_2(aq)+MgSO_4(aq)\rightarrow MgCl_2(aq)+BaSO_4(s)[/tex]
The complete ionic equation follows:
[tex]Ba^{2+}(aq)+2Cl^-(aq)+Mg^{2+}(aq)+SO_4^{2-}(aq)\rightarrow Mg^{2+}(aq)+2Cl^-(aq)+BaSO_4(s)[/tex]
As magnesium and chloride ions are present on both sides of the reaction. Thus, they are considered spectator ions.
The net ionic equation follows:
[tex]Ba^{2+}(aq)+SO_4^{2-}(aq)\rightarrow BaSO_4(s)[/tex]
Precipitate of barium sulfate will form.
(c):
The balanced molecular equation is:
[tex]AgNO_3(aq)+KI(aq)\rightarrow KNO_3(aq)+AgI(s)[/tex]
The complete ionic equation follows:
[tex]Ag^{+}(aq)+NO_3^-(aq)+K^+(aq)+I^{-}(aq)\rightarrow K^+(aq)+NO_3^-(aq)+AgI(s)[/tex]
As potassium and nitrate ions are present on both sides of the reaction. Thus, they are considered spectator ions.
The net ionic equation follows:
[tex]Ag^{+}(aq)+I^{-}(aq)\rightarrow AgI(s)[/tex]
Precipitate of silver iodide will form.
(d):
The balanced molecular equation is:
[tex]2NaCl(aq)+(NH_4)_2CrO_4(aq)\rightarrow 2NH_4Cl(aq)+Na_2CrO_4(s)[/tex]
The complete ionic equation follows:
[tex]2Na^{+}(aq)+2Cl^-(aq)+2NH_4^+(aq)+CrO_4^{2-}(aq)\rightarrow 2NH_4^+(aq)+2Cl^-(aq)+Na_2CrO_4(s)[/tex]
As ammonium and chloride ions are present on both sides of the reaction. Thus, they are considered spectator ions.
The net ionic equation follows:
[tex]2Na^{+}(aq)+CrO_4^{2-}(aq)\rightarrow Na_2CrO_4(s)[/tex]
Precipitate of sodium chromate will form.
Hydrochloric acid is widely used as a laboratory reagent in refining ore for the production of tin and tantalum, and as a catalyst in organic reactions. Calculate the number of moles of HCl in 62.85 mL of 0.453 M hydrochloric acid.
Answer: 0.0285 moles of HCl is present in given amount of solution.
Explanation:
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:
[tex]\text{Molarity of solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (mL)}}[/tex] .....(1)
Given values:
Molarity of HCl = 0.453 M
Volume of solution = 62.85 mL
Putting values in equation 1, we get:
[tex]0.453mol/L=\frac{\text{Moles of HCl}\times 1000}{62.85}\\\\\text{Moles of HCl}=\frac{0.453\times 62.85}{1000}=0.0285moles[/tex]
Hence, 0.0285 moles of HCl is present in given amount of solution.
What is the law
of universal gravitation?
Answer:
[tex]{ \boxed{ \bf{newtons \: law \: of \: gravitation}}} [/tex]
It states that the product of masses of bodies ( planets and satellites and asteroids ) in space is inversely proportional to square of their separation mean distance
[tex]{ \tt{formular : F = \frac{GMm}{ {r}^{2} } }}[/tex]
To produce a neutral solution, both the anion and the cation of a salt must be neutral.
a. True
b. False
10. A 38.0-g sample of NaOH is dissolved in water, and the solution is diluted to give a final
volume of 1.70 L. The molarity of the final solution is
a. 22.3 M.
b, 0.558 M
c 0.95 M
d. 0.0447 M
e. 0.619 M
Answer:
B.0.558M
Explanation:
M=n/L
n=m/Mm
Mm=NaOH
=23+16+1
=40g/mol
n=m/Mm
= 38/40
=0.95
M=n/L
=0.95/1.70
=0.558
Please help me I need help with this questions I’m very confused fused as to what the answer is please
Which of the following statements is NOT true?
A.) When HX adds to an asymetrical alkene, the SP2 carbon bonded to the most H atoms is protonated.
B.) When HX adds to an asymetrical alkene, protonation leads to the most stable carbocation intermediate.
C.) When HX adds to a symetrical alkene, either of the SP2 carbons can be protonated.
D.) When HX adds to an asymetrical alkene, the halogen attaches to the least substituted SP2 carbon.
Answer:
D.) When HX adds to an asymmetrical alkene, the halogen attaches to the least substituted sp² carbon.
Explanation:
Which of the following statements is NOT true?
A.) When HX adds to an asymmetrical alkene, the sp² carbon bonded to the most H atoms is protonated. TRUE. This is known as Markovnikov's rule.
B.) When HX adds to an asymmetrical alkene, protonation leads to the most stable carbocation intermediate. TRUE. The order of stability of carbocations is tertiary > secondary > primary.
C.) When HX adds to a symmetrical alkene, either of the sp² carbons can be protonated. TRUE. Since the alkene is symmetrical, either carbon can be protonated.
D.) When HX adds to an asymmetrical alkene, the halogen attaches to the least substituted sp² carbon. FALSE. The halogen attaches to the most substituted sp² carbon.
Pb(NO3)2 + 2Naci
2NaNO, + PbCI,
Substance
Number of Protons
Number of
Electrons
2.
3
lithium
fluorine
9
10
19
potassium
sulfur
19
18
16
19. Which substance is electrically neutral?
A. lithium
B. fluorine
Β
C. potassium
D. sulfur
20. Which substance has an overall I'charge?
Answer:
lithium 3
Explanation:
This is because lithium has three protons
A student performs an experiment three times. The results are 4.52 g/mL, 4.54 g/mL, and 4.39 g/mL. Which of the following best describes these results with only the information given in this question?
a. high accuracy
b. high accuracy and high precision
c. high accuracy and low precision
d. high precision
a) When magnesium forms a compound with oxygen, electrons are transferred from the atom to the atom. b) What type of bonding exists between the magnesium and oxygen atoms? c) Indicate the electrical charge on each of the ions and the total electrical charge on the compound.
Answer and Explanation:
Magnesium = Mg (metal) ⇒ oxidation number = +2 (it loses 2 electrons)
Oxygen = O (non-metal) ⇒ oxidation number in oxides = -2 (it gains 2 electrons)
a) We first write the chemical elements with their oxidation numbers in superscripts:
Mg⁺² O⁻²
Then, the oxidation numbers are written crossed as subscripts:
Mg₂O₂
Finally, we divide by a common denominator (2):
MgO
b) Between a metal (Mg) and a non-metal (O), the formed bond is an ionic bond. The metallic element (Mg) loses 2 electrons that are accepted by the non-metallic element (O).
c) Mg : loses 2 electrons ⇒ +2
O: gains 2 electrons ⇒ -2
The total electrical charge is: +2 + (-2) = 0
What is the product of the unbalanced equation below?
Ca(s) + O2(g)
A. CaO2(5)
B. Cao(s)
C. 2Ca(s) + O2(9)
D. Ca20(s)
Answer:
I think B
Explanation:
2Ca + O2 -> 2CaO
The product of the unbalanced equation: [tex]\rm Ca(s) + O_2(g)[/tex] is [tex]\rm CaO(s)[/tex]. The correct answer is option B.
A product is a material which arises from a chemical process. It is the end result of the reaction and is produced by the rearrangement of the atoms or molecules of the reactants.
This reaction's balanced chemical equation is:
[tex]\rm 2Ca(s) + O_2(g) \rightarrow 2CaO(s)[/tex]
The reaction begins by heating calcium metal in the presence of oxygen gas or by exposing calcium metal to oxygen-containing air. Calcium oxide [tex](\rm CaO)[/tex] is formed by the reaction of calcium metal (Ca) with oxygen gas[tex]\rm (O_2)[/tex].
In this equation, two atoms of calcium react with one molecule of oxygen gas to form two molecules of calcium oxide. The reaction is exothermic, meaning it releases heat energy.Therefore, the result of the stated chemical reaction is [tex]\rm CaO(s)[/tex]. Option B is the correct answer.
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The pressure exerted by a gas container depends on
