Answer:
1. the bottom layer
2. aqueous HCI
3. the top layer
4.aqueous NaOH
5. mostly in the diethyl ether layer
Explanation:
Pure dimethylformamide is considerably more polar than hexane hence thee two solutions will form two phases with the pure dimethylformamide as the bottom layer.
If we want to extract aniline from chloroform, HCl must be added in order to give a salt that can be extracted into the aqueous layer.
For a mixture of methylene chloride and diethyl ether, the diethyl ether layer will be found as the top layer since it is considerably less polar than methylene chloride.
Benzyl alcohol can be extracted from a solution of chloroform by adding NaOH and extracting it into an aqueous layer.
A large partition coefficient for the extraction of naphthalene into diethyl ether from water means that naphthalene will be found mostly in the diethyl ether layer.
A sample of rubidium contains two different isotopes. 72.15% of the sample
if Rubidium-85 while 27.85% is Rubidium-87. What is the average atomic
mass of the sample?
Answer:
Average atomic mass = 85.557 amu.
Explanation:
Given data:
Percent abundance of Rb-85 = 72.15%
Percent abundance of Rb-87 = 27.85%
Average atomic mass = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (72.15×85)+(27.85×87) /100
Average atomic mass = 6132.75 + 2422.95 / 100
Average atomic mass = 8555.7 / 100
Average atomic mass = 85.557 amu.
How are sunspots correlated with the sun's activity?
Answer:
If sunspots are active, more solar flares will result creating an increase in geomagnetic storm activity for Earth.
Explanation:
I ask mom
An unknown element is determined to have 22 neutrons and a mass number of 40.
What element is this?
Help fast I really need it bad
Answer:
Pain
Explanation:
the pain depends on u banging your head
How many TOTAL ELECTRONS are in the compound CO2?
o (2 dots at the top and 2 on the bottom) = c = o (2 dots on the top and 2 dots on the bottom)
16
14
12
8 ml
What is the correct name for PBr3?
phosphorus bromine
Phosphorus tribromide
monophosphorus tribromide
Answer:
22 electrons are in the compound CO2. And the correct answer is Phosphorus tribromide.
Explanation:
How many electron dots should As have?
Answer:
5
Explanation:
What is the mass, in grams, of one mole of any substance known as? (please help!)
A.
atomic mass
B.
molar mass
C.
molecular weight
D.
atomic number
What is the difference between the systematic and common name for monatomic ions?
Answer:
The correct answer is B)The systematic name is the metal name followed by the charge on the metal atom. It is written as a Roman numeral and is in parentheses.
The common name is formed from the Latin root followed by -ous for low charge form, -ic for high charge form
Whatss the answer giving brainliest:)
Answer:
A.
Explanation:
I just know.
Answer:
a.
Explanation:
HELP!!!
OPTIONS:
gas,
liquid,
solid
Answer:
Melting: solid liquid, Freezing: liquid to solid, Evaporation: liquid to gas.
Explanation:
mark me the brainliest
How much heat is required to heat 1.6g of ice from -16c to steam at 112c?
Answer:
Total heat ≅ 49.07 kJ
Explanation:
Given that:
mass = 1.6 g = 0.016 kg
Initial temperature = - 16 ° C
final temperature = 112° C
specific heat for ice = 2.06 kJ/kgC
specific heat of water = 4.186 kJ/kgC
heat fusion of ice = 334 kJ/kg
specific heat for steam = 2.1 kJ/kgK
heat of vaporization of water = 2256 kJ/kg
To heat ice from -16 ° C to 0 ° C
Q₁ = 2.06 kJ/kgC × 0.016 kg × 16 ° C
Q₁ = 0.52736 kJ
To melt Ice at 0° C
Q₂= 334 kJ/kg × 0.016 kg = 5.344 kJ
To heat water from 0° C to 100° C
Q₃ = 4.186 kJ/kgC × 0.016 kg × 100° C
Q₃ = 6.6976 kJ
To vaporize water to steam at 100° C
Q₄ = 2256 kJ/kg × 0.016 kg = 36.096 kJ
To heat steam from 100C to 112° C
Q₅ = 2.1 kJ/kgC × 0.016 kg × 12 C
Q₅ = 0.4032 kJ
Total heat = Q₁ + Q₂ + Q₃ + Q₄ + Q₅
Total heat = (0.52736 + 5.344 + 6.6976 + 36.096 + 0.4032) kJ
Total heat = 49.06816 kJ
Total heat ≅ 49.07 kJ
CAN SOMEONE PLEASE HELP ME ANSWER THIS QUESTION
Answer:
Carbon Dioxide
Explanation:
Plants inhale Carbon Dioxide and exhale Oxygen
Oxygen
Hydrogen
Nitrogen
Carbon
A.
B.
c.
D
Which model represents the chemical formula NO2, nitrogen dioxide?
A)
A
B)
B.
o
C С.
D D
Answer:
the answer is C
Explanation:
there is 1 purple and 2 blues
The model which represents chemical formula of nitrogen dioxide is C.
What is chemical formula ?Chemical formula is a way of representing information about the proportions of elements which are present in a compound or molecule.It is generally written with the symbols of chemical elements. It also makes use of brackets and subscripts.
Number of atoms of each element is written as a subscript .Chemical formula makes use of no words . It is not the same as structural formula .Chemical formula in the simplest form is called as the empirical formula.
Drawbacks of chemical formula are that they do not provide information about the position of atoms and not also on the structure. Owing to these reasons, chemical formula is not that informative as that of structural formula.
Learn more about chemical formula,here:
https://brainly.com/question/11995171
#SPJ2
Diazomethane has the following composition by mass: 28.57% C, 4.80% H, and 66.64% N. The molar mass of diazomethane is 42.04 g/mol. Find the molecular formula of diazomethane.
Answer:
CH2N2
Explanation:
To find the molecular formula, we must first find the empirical formula as follows:
28.57% C - 28.57g of Carbon
4.80% H - 4.80g of Hydrogen
66.64% N - 66.64g of Nitrogen
Next, we convert this mass values to mole by dividing by their respective atomic mass.
C = 28.57/12 = 2.38mol
H = 4.80/1 = 4.80mol
N = 66.64/14 = 4.76mol
Next, we divide each mole value by the smallest mole value (2.38mol)
C = 2.38mol ÷ 2.38 = 1
H = 4.80mol ÷ 2.38 = 2.01
N = 4.76mol ÷ 2.38 = 2
The empirical ratio of C, H and N is therefore 1:2:2. Hence, the empirical formula is CH2N2
To calculate the molecular formula;
(CH2N2)n = 42.04 g/mol
{12 + 1(2) + 14(2)}n = 42.04
{12 + 2 + 28}n = 42.04
{42}n = 42.04
n = 42.04/42
n = 1.00009
Since n = 1, molecular formula is CH2N2
Is this a balanced equation?
Answer: NO
Explanation:
Answer:
yes
Explanation:
CAN SOMEONE PLEASE HELP ME I WILL GIVE BRAINLIEST
Answer:
9812
Explanation:
i think
Answer:
if im correct its b but im not 100 percent sure
Explanation:
Please help I need help fast
what is triavalent monovilant divalent ?
Answer:
I HOPE IT HELPED THANKS
What is the oxidation number for N in the compound NH3? (Recall that H usually has an oxidation number of +1.)
0 -3
0-1
Ο Ο
O +3
Answer:
the oxidation number is -3
Taking into account the definition of oxidation number, the oxidation number for N in the compound NH₃ is -3.
Definition of oxidation numberThe oxidation number is the charge that an atom has; is an integer that represents the number of electrons an atom puts into play when it forms a given compound.
In other words, the oxidation number of an element is a value that indicates the number of electrons that element gains or loses when it combines with another.
Oxidation number determinationTo determine the oxidation state it is necessary to know that The oxidation number of hydrogen in a compound is +1, except in metal hydrides, where is –1.
On the other side, the sum of the oxidation numbers of the existing elements in a chemical formula must add up to zero.
Then, considering the oxidation numbers of each element, multiplying it by the number of existing elements in the chemical formula and adding it and equaling it to zero, the value of the missing oxidation number can be obtained.
Oxidation number of nitrogenIn this case, the oxidation numbers of nitrogen is calculated as:
NH₃: oxidation numbers of nitrogen + 3×(+1)= 0
Solving:
oxidation numbers of nitrogen + 3= 0
oxidation numbers of nitrogen = -3
Finally, the oxidation number for N in the compound NH₃ is -3.
Learn more about the oxidation number:
brainly.com/question/8990767
brainly.com/question/6498977
#SPJ2
What happens to valence electrons when a covalent bond forms?
Explanation:
Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability
What are [H3O+], [OH?], and pH in a solution with a pOH of 11.17? Make sure your answers are given to the correct number of significant figures.
[H3O+] = __ x 10 __ M
[OH?] = __ x 10 __ M
pH= __
Answer:
[OH⁻]= 6.76*10⁻¹² M
pH= 2.83
[H₃O⁺]= 1.48*10⁻³
Explanation:
The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution that indicates the concentration of hydroxyl ions [OH-] present in a solution. The pOH is defined as the logarithm of the concentration of OH- ions, with the sign changed:
pOH= -log[OH⁻]
In this case, pOH= 11.17. So:
11.17= -log [OH⁻]
Solving:
-11.17=log [OH⁻]
10⁻¹¹ ¹⁷= [OH⁻]
6.76*10⁻¹² M= [OH⁻]
pH, short for hydrogen potential, is a parameter that indicates the concentration of hydrogen ions [H⁺] or [H₃O⁺] that exist in a solution and is calculated as the logarithm of the concentration of H⁺ ions, with the sign changed:
pH= -log[H⁺]= -log[H₃O⁺]
The relationship between pH and pOH can be established by the expression:
pH + pOH= 14
In this case, being pOH=11.17:
pH + 11.17= 14
and solving you get:
pH= 14 - 11.17
pH= 2.83
Finally, replacing this value in the definition of pH:
2.83= -log [H₃O⁺]
and solving you get:
-2.83= log [H₃O⁺]
10⁻² ⁸³= [H₃O⁺]
1.48*10⁻³= [H₃O⁺]
Why are tables and graphs useful for organizing scientific data?
Answer:
Since most of the data scientist collect is quantitative, data tables and charts are usually used to organize the information • Graphs are created from data tables • They can allow the investigator to get a visual image of the observations, which simplifies interpretation and drawing conclusions • Valid conclusions depend
what is the purpose of attaching the clip/ clamp with graphite of the the pencil to the battery?
Multiple Choice
Which of the following is a good study habit?
A. maintaining a positive attitude
B. waiting until the last minute to start on an assignment
C. listening to the television while studying
D. studying when you are tired
Answer:
A.- maintaining a positive attitude
Explanation:
The answer is very obvious you need to maintain a positive attitude while studying.
Answer:
A: maintaining a positive attitude
Explanation:
I myself have personal experience with all of these, and B,C,D just don´t seem like reasonable answers. If you wait until the last minute to start an assignment, chances are you won´t get it done. Listening to the television while studing is a pretty bad idea because you might get distracted. Never study when tired because if you´re tired the information might not stick in your head. The only answer left is A.
Which 20.0 g sample of metal is most likely to undergo the smallest change in temperature upon absorption of 100.0 J of heat?
Substance Specific Heat Capacity (J/g*K) Elements aluminum, 0.900 AI graphite, 0.711 iron, Fe 0.450copper, Cu 0.387 gold, Au 0.129a. copper
b. aluminum
c. graphite
d. iron
e. gold
Answer:
b. aluminum
Explanation:
The specific heat capacity is defined as the amount of heat required to raise the temperature of 1g of a material in 1°C.
Thus, the sample with the higher specific heat capacity is the sample that will require more energy to increase its temperature in 1°C, suffering the smallest change in temperature.
Thus, is the aluminium with 0.900J/gK the element that is most likely to undergo the smallest change in temperature:
b. aluminumWhich of the following bases is the STRONGEST? The base is followed by its Kb.A. C6H5NH2, 4.0 × 10-10 B. NH3, 1.76 × 10-5 C. CH3NH2, 4.4 × 10-4 D. (CH3CH2)2NH, 8.6 × 10-4 E. C5H5N, 1.7 × 10-9
Answer:
(D) (CH3CH2)2NH
Explanation:
In order to decide which base is strongest we need to calculate its PKb
PKb = -log [Kb]
A large Kb value and small PKb value gives the strongest base
Compound Kb PKb
(A) C6H5NH2 - 4 x 10^-10 9.349
(B) NH3 1.76x 10^-5 4.754
(C) CH3NH2 4.4x 10^-4 3.357
(D) (CH3CH2)2NH 8.6x 10^-4 3.066
(E) C5H5N 1.7x10^-9 8.77
Clearly (CH3CH2)2NH is the strongest base.
Please help me answer this
Please help me with this question
Answer:
It shows constant motion when a straight line( not parallel) is formed in distance time graph.
whats the awnser? i cant find it and i need it asap! anyone i will crown you the brainleist!
I need a hand with this one:
Having this equation:
Na2SO4 +BaCl2 = BaSO4+NaCl
If 10.09 grams of Na2SO4 were added to a 50mL barium solution and reacted completely, what was the BaCl2 molarity of the solution?
Yes, I already know its a displacement reaction
Thx
Answer:
[BaCl₂] = 1.42M
Explanation:
Given: Na₂SO₄(aq) + BaCl₂(aq) => 2NaCl(aq) + BaSO₄(s)
The balanced equation shows a 1:1 reaction between Na₂SO₄(aq) & BaCl₂(aq) and means the moles of sodium sulfate used equals the moles of baium chloride used. The concentration is the theoretical mole value calculated divided by 0.050 Liters.
Na₂SO₄(aq) + BaCl₂(aq) => 2NaCl(aq) + BaSO₄(s)
Moles of Na₂SO₄(aq) = moles of BaCl₂(aq) = 10.09g/142.04g/mol = 0.071mole
∴ Molar Concentration of BaCl₂(aq) = moles BaCl₂/Volume of Soln in Liters
= 0.071mole/0.050Liters = 1.42M in BaCl₂.
