Answer:
In acetic acid, due to the +I effect of the alkyl group the electron density on the oxygen atom increases.
The release of H + ion becomes difficult. Thus , greater the magnitude of +I effect weaker will be the acid.
Order of +I effect : CH 3>H
Therefore , formic acid (HCOOH) is more acidic than acetic acid (CH 3COOH).
3 facts about earths layers?
The inner core is solid, fourth layer and made out of iron and nickel. It's the one mostly in charge for the other layers. If the inner core stopped spinning, the outer core would lose its magnetic field, and this will be bad because of the sun's radiation wave. Including the other layers.
The outer core is the liquid, third layer. It's in charge of Earth's magnetic field.
The mantle is the second layer of earth, the original temperature can come up about to 1000+ or more, celsius.
is tasting an advisable method for identifying substance?why?
The glancing angle (θ) of a Bragg reflection (n = 1) from a set of crystal planes separated by 99.3 pm is 10.42°. Calculate the wavelength of the X-rays that is used.
Answer:
wavelength λ = 35.92 pm
Explanation:
Given that:
The glancing angle (θ) = 10.42°
Bragg reflection n = 1
wavelength λ = ???
diameter d = 99.3 pm
Using the formula:
nλ = 2dsinθ
we have:
1 × λ = 2 × ( 99.3) × sin (10.42°)
λ = 198.6 × 0.18086
λ = 35.92 pm
The wavelength of the X-rays that is used is equal to 35.9 nanometers.
Given the following data:
Bragg reflection, n = 1Glancing angle (θ) = 10.42°.Distance between planes = 99.3 picometers.To calculate the wavelength of the X-rays that is used, we would apply Bragg's law of reflection:
Mathematically, Bragg's law of reflection is given by the formula:
[tex]n\lambda = 2dsin\theta[/tex]
Where:
n is Bragg reflection.d is the distance between crystal planes.[tex]\lambda[/tex] is the wavelength.[tex]\theta[/tex] is the reflection angle.Substituting the given parameters into the formula, we have;
[tex]1 \times \lambda = 2 \times 99.3 \times 10^{-11} \times sin(10.42)\\\\ \lambda = 1.99 \times 10^{-9} \times 0.1809\\\\\lambda = 3.59 \times 10^{-10}[/tex]
Wavelength = 35.9 nanometers.
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Mole Conversion: How many moles in 45 grams of H2SO4
Answer:
0.45881381335
Explanation:
divide 45 by the molar mass of H2SO4
45/98.079
Answer:
0.45
Explanation:
divise
What type of chemical reaction is the following? BaCl2(aq) + Na2SO4(aq)
→ BaSO4(s) + 2 NaCl(aq) *
Answer:
it's a precipitation reaction.
Explanation:
since a solid is produced, one of the elements are insoluble with one another–making a precipitate.
Select the correct location on the. Image
Which of these four elements is the most reactive metal?
2
He
10
Ne
18
Ar
36
Kr
54
Xe
85 86
Rn
6
B
Be
12
Mg
20
Ca
38
Sr
17
CI
35
Br
53
16
14
Si
15
P
Na
19
K
37
Rb
34
Se
52
Te
32 33
31
Ga
49
In
81 82
TI
113
Nh
Ge
50
Sn
As
51
Sb
83
B
115
Mc
55 56
84
Cs
87
Fr
Ba
88
Ra
Pb
114
FI
Po
At
116 117 118
Lv
Ts Og
Answer:
detail is given below.
Explanation:
First of all we will discuss the reactivity trend.
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases and reactivity decreases.
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and reactivity increases.
In this way rubidium is more reactive than sodium and indium is more reactive than Al.
but when we compare across period sodium is more reactive than Al while Ra is more reactive than In.
7. What is the mass in grams of 5.90 mol CgH1g? (l point)
0.0512 g
O19.4 g
389 g
O673 g
Answer:
m = 673 g
Explanation:
We need to find the mass of 5.90 mol of [tex]C_8H_{18}[/tex]
Molar mass of [tex]C_8H_{18}[/tex] is:
[tex]M=8\times 12+1\times 18\\\\=114\ g/mol[/tex]
Let m be the mass of 5.90 mol of [tex]C_8H_{18}[/tex]. Using mole concept to find it.
No of moles = mass/molar mass
[tex]m=5.9\times 114\\\\=672.6\ g\\\\\approx 673\ g[/tex]
So, the required mass is 673 g. Hence, the correct option is (d).
Answer:
673 g
Explanation:
Whats the equation and answer for these two separate questions
Answer:
1).
[tex]speed = \frac{distance}{time} \\ speed = \frac{100}{4} \\ speed = 25 {ms}^{ - 1} [/tex]
2).
[tex]time = \frac{distance}{speed} \\ time = \frac{225}{75} \\ time = 3 \: s[/tex]
Two answer multiple-choice-- please help!
What is true about reaction spontaneity and entropy?
The rusting of iron is a nonspontaneous process because rust particles have less entropy than iron, and reactions with a decrease in entropy are nonspontaneous.
A spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
Answer:
A spray of perfume diffusing in a room is a spontaneous process because gas particles have higher entropy when they are spread evenly around the room.
This is true because entropy increase when gas particles spread
Explanation:
ANSWER THIS QUESTION AND GET 10 POINTS AND BRAINLEST
Answer:
A.All Mixtures Are Made Up Of Solutions
Explanation:
When you move one of the bonding pairs of a molecule closer to another one, what is the effect?
Answer:
They repel due to a force of repulsion
how could a carbon atom in coal end up in a penguin
Answer:
Explanation:
Combustion of coal releases carbon as CO2. Phytoplankton remove carbon dioxide from the atmosphere by photosynthesis. Carbon is passed along the food chain as fish eat the plants. Penguins feed on the fish, taking in the carbon compounds containing the original carbon atom.
The carbon atoms in coal end up in a penguin due to the process of food chain.
What is a penguin?
Penguins are aquatic flightless birds that are found in the Southern Hemisphere.
The food chain leads to the carbon atom into the penguin.
The carbon atoms are release from the coal combustion.
The released atoms go into plants leaves.
The herbivorous eat plants.
Then the carnivorous eats the herbivorous.
The carnivorous can be a fish and fish are eaten by penguins.
Thus, in this way, the carbon atoms in coal end up in a penguin due to the process of food chain.
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Calculate the number of moles in a liquid sample of a substance that has a molar heat of fusion of 3.811 kJ/mol, if the sample releases 90.6 kJ when it freezes. Answer in units of mol Calculate the molar mass of the substance if the mass of the sample is 2022 g. Answer in units of g/mol.
Answer:
23.77mole,85.1g/mol
Explanation:
the moles of liquid is 23.77mole which is obtained by divide 90.6kj to 3.811kj/mol and molar mass is obtained from the formula of mole eg mole=mass/molar mass but mass is given and moles is obtained above.
When the molar mass of the significance of the mass of the sample is 2022 g is = 23.77mole, 85.1g/mol.
Calculation of Molar mass
When the molar mass of a chemical combination is defined as the mass of a sample of that compound separated by the amount of substance in that instance, measured in moles.
Although, The molar mass is a bulk, not molecular, property of a substance. The molar mass is an average of many instances of the combination, which often change in mass due to the existence of isotopes.
When the moles of liquid is 23.77mole which is received by dividing 90.6kj to 3.811kj/mol and molar mass is acquired from the formula of mole eg mole is = mass/molar mass but the mass is given and moles is conveyed above.
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Consider the following properties of an element: (i) It is solid at room temperature. (ii) It easily forms an oxide when exposed to air. (iii) When it reacts with water, hydrogen gas evolves. (iv) It must be stored submerged in oil. Which element fits the above description the best
Answer: The options are not given, here are the options.
1.Sulfur.
2. Mercury.
3. Copper.
4. Sodium.
5. Magnesium.
The correct answer is sodium.
Explanation:
It is sodium because sodium is a chemical element with the symbol Na and it has atomic number 11. It is an akali metal, it is soft, slivery and does not occur free in nature.it is found in compound and group 1 on the periodic table. It is solid at room temperature. (ii) It easily forms an oxide when exposed to air. (iii) When it reacts with water, hydrogen gas evolves. (iv) It must be stored submerged in oil.
what conclusion can be drawn from the statement that the element has a high ionization energy and a small atomic size?
Answer: What conclusion can be drawn from the statement that an element has high ionization energy and small atomic size? The element is most likely from Group 1A or 2A and in period 1 or 2. Describe how the atomic radius of an element is related to metallic character.
Explanation:
How many grams make up 0.780 moles of calcium cyanide (CaCN)
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 71.84g is the mass of 0.780 moles of calcium cyanide.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically, the formula for mole can be given as
mole of calcium cyanide=given mass of calcium cyanide ÷ molar mass of calcium cyanide
number of mole of calcium cyanide= 0.780 moles
mass of calcium cyanide=?
molar mass of calcium cyanide=92.1128 g/mol
Substituting the values in above formula we get
0.780 moles = mass of carbon ÷92.1128 g/mol
On calculations, we get
mass of calcium cyanide=71.84g
Therefore, 71.84g is the mass of 0.780 moles of calcium cyanide.
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#SPJ2
as most substances are cooled they expand true or false
Answer:
False
Explanation:
which of the following describes a liquid
Answer:
b I beleive
Explanation:
the shape of a liquid changes based on the container it is in, but the volume stays the same
Answer:
Option B
Explanation:
why is this 2H2+O2=2H2O a chemical change
Answer:
chemical change, because you are changing the actual molecules into differerent substances in a chemical way
Explanation:
What are small subunits or building blocks of a large molecule called?
A. Macromolecules
B. Monomer
C. Polymer
D. Organic
Answer:
c
Explanation:
PLS PLS PLS HELP ME I WILL MARK YOU BRINLYEST JUST PLS :((
Complete the sentence to describe muscle tissue. Muscle tissue in the body is made up of a group of ___________ working together to perform a common function.
Answer:
tissue is made by a group of cells
Answer:
cells
Explanation:
taking the test =)
Suzy steps on the scale and measures her weight to be 125 lbs. How much
does she weigh in kg?
Select one:
O a 125 kg
O b. 0.0176 kg
O c.56.8 kg
O d. 275 kg
Answer:
125 lbs would round to C. 56.8kg
write the chemical equation of the reaction between more active metal and more active non metal ?
Answer: Jump to Active Metal Reactions with Oxygen · The method used to predict the products of reactions of the main group metals is simple, yet remarkably powerful. Exceptions to its predictions arise, however, when very active metals react with oxygen, which is one of the most reactive nonmetals. It reacts with O2 to form an oxide that contains the O2- ion.
The chemical formula of its chloride of a metal m is MCl3. Write the chemical formula of its chloride, bicarbonate, and sulphide.
plz answer asap
Explanation:
Chemical formula of chloride of metal M is MCl₃
We know that Cl has valency 1.
nowzl, it's cleared that M had valency 3.
Bcz the after criss-cross it forms MCl₃.
Now,
Chemical formula of bicarbonate:
we know that bicarbonate has its valency/charge 1
So, after criss-cross the formula of metal bicarbonate is M(HCO₃)₃
Chemical formula of sulphide:
we know that sulphide has its valency/charge 2
So, after criss-cross the formula of metal metal is M₂S₃
True or False
Very few faults occur along plate boundaries
Answer:
False, hope this helps :)
How many elements are in Na2CO3?
Answer:
3 i believe
Explanation:
Answer: 3
Explanation: I took the test!!!
Methane gas combusts according to the following
chemical equation:
CH4 (8) + 202(g) → CO2(g) + 2H2O(l)
29.2 L of methane gas is combusted with 63.3 L of
oxygen gas at STP. What volume of carbon dioxide
is produced in the reaction?
___L CO2
Your answer should be rounded to three significant figures. Do
not include units in your answer.
The volume of Carbon dioxide : 29.12 L
Further explanationGiven
ReactionCH4 (g) + 202(g) → CO2(g) + 2H2O(g)
Oxygen volume = 63.3 L
Methane volume = 29.2 L
RequiredThe volume of Carbon dioxide
Solution
1 mol gas at STP = 22.4 L
mol methane :
[tex]\tt \dfrac{29.2}{22.4}=1.3[/tex]
mol oxygen :
[tex]\tt \dfrac{63.3}{22.4}=2.83[/tex]
limiting reactant : CH₄(smaller ratio:mol/reaction coefficient)
So mol CO₂ based on CH₄
From equation, CO₂ : CH₄ = 1 : 1, so mol CO₂ = 1.3
The volume =
[tex]\tt 1.3\times 22.4=29.12~L[/tex]
The volume of carbon dioxide is produced in the reaction is 29.12 L
The calculation is as follows:We know that
1 mol gas at STP = 22.4 L
So,
The mol methane is
[tex]= 29.2 \div 22.4\\\\= 1.3[/tex]
Now
The mol oxygen is
[tex]= 63.3 \div 22.4\\\\= 2.83[/tex]
Now the volume is
[tex]= 22.4 \times 1.3[/tex]
= 29.12 L
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Suppose a new group 5A element is discovered. Photoelectron spectroscopy (PES) reveals that its last two peaks occur at 1370 kJ/mol and 777 kJ/mol. Calculate the average valence electron energy (AVEE) of this element.
Answer: The average valence electron energy (AVEE) of this element =
1014.2 KJ/ mol or 1.0142mJ/mol.
Explanation:
The average valence electron energy = (number of electrons in s subshell x Ionization energy of that subshell) + (number of electrons in p subshell x Ionization energy of that subshell) / total number of electrons in both subshells of the valence shells.
The 5A elements are non-metals like Nitrogen and Phosphorus with the metallic character increasing as you go down the group, So a new 5A element will have characteristics of its group with 5 valence electron in its outermost shell represented as ns2 np3
Therefore the average valence electron energy (AVEE) of this element will be calculated as
The average valence electron energy = (2 x 1370 kJ/mol + 3 x 777 kJ/mol.) / 5
2740+2331/ 5 =5071/5
=1014.2 KJ/ mol or 1.0142mJ/mol.
Describe Henri Becquerel's role in the discovery of radioactivity
Answer:
Explanation:
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
X-rays are neutral and cannot be bent in a magnetic field. The new radiation was bent by the magnetic field so that the radiation must be charged and different than x-rays.
