Answer:
study of chemical used in industries
Magnesium has 12 electrons. How many electrons will be orbiting in the outermost shell, farthest away from the nucleus?
1) 2
2) 10
3) 8
4) 4
5) 3
6) 7
Answer:
Magnesium has an outer energy level of n=3 with two electrons in in its energy level. Therefor Magnesium has 2 valance electrons.
Explanation:
For the reaction C+2H 2 —->CH 4 calculate the percent yield if 98 g of methane is produced when 100. g of carbon reacts with an excess of hydrogen?
The percent yield : 73.5%
Further explanationGiven
Reaction
C+2H₂⇒CH₄
Required
The percent yield
Solution
mol of Carbon(as a limiting reactant) :
[tex]\tt \dfrac{100}{12}=8.3[/tex]
mol CH₄ based on C, and from equation mol ratio C : CH₄, so mol CH₄ = 8.3
Mass of Methane(theoretical yield) :
[tex]\tt mass=mol\times MW\\\\mass=8.3\times 16=133.3~g[/tex]
[tex]\tt \%~yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{98}{133.3}\times 100\%=73.5\%[/tex]
what geologic process directly forms beaches on the shores of the bay?
The geologic process that directly forms beaches on the shores of the bay should be considered as the sediment deposition.
What is sediment deposition?The Deposition refer to the laying down of sediment that should be carried by wind, where the water should be flowing down or there is the sea or ice. Sediment could be transported just like the pebbles, sand ,and mud, or as salts mix in the water.
Therefore, The geologic process that directly forms beaches on the shores of the bay should be considered as the sediment deposition.
Learn more about geologic here: https://brainly.com/question/3101097
Dr. Moore and his team have learned from GPS data that two continents with an ocean between them have been moving toward each other. Some students living on the coast of one of these continents don’t understand what is happening and they are worried that the continents will run into each other. How could Dr. Moore explain to them what is happening?
Answer:
Dr. Moore can explain that it is continental drift.
Explanation:
continental drift is the phenomenon due to which all the continents are moving towards each other, due to this continental drift stundents afraidthat some day these continents will collide leading to catastrophe.
But this is not gonna happen in a snap, this needs a lot of time, this will take hundreds of years and even more. So there is nothing to be afraid of till then humans will find some or the other way to manage this. Plus as I said this process is very slow so there are very less chances that this could lead us to any kind of chaos or anhilation.
(Btw, this isn't my work, it's just that someone already answered this same question, and they didn't answer yours so I thought I'd give it to you.)
explain what happens during the chemical reaction
CaCO3 -> CaO + CO2
check out this article i found it very helpful,
I couldn't find the answer to your question.
SHOW WORK
How many drops are in a 2-L bottle of Pepsi?
Answer:
The number of drops depends upon the size of the drops. So, basically, 1 ml has a drops of 20
so 2000 mo will have a 40k drops
Name the three stress forces that cause changes in Earths crust. Explain how each type of force affects rock.Identify the type of fault that each force produces. This is science i couldnt find a science thing
Answer:
Shear
Tension
Compression
Explanation:
The 3 stress forces are;
-shear
-tension
-compression
1) Shear is the stress force that pushes back a mass of rock in two opposite directions which in turn will produce strike - slip faults.
2) Tension is the stress force that pulls on the crust thereby stretching in a manner that it becomes thinner at its middle which in turn will produce normal faults.
3) Compression is the stress force that makes rocks squeeze until they fold or break and this will in turn produce reverse faults.
if an unknown gas has one third the root mean squarevspeed of H2 at 300 K, what is the molar mass of the gas?
The molar mass of the gas : 18 x 10⁻³ kg/mol
Further explanationGiven
An unknown gas has one third the root mean square speed of H2 at 300 K
Required
the molar mass of the gas
Solution
Average velocities of gases can be expressed as root-mean-square (V rms)
[tex]\large {\boxed {\bold {v_ {rms} = \sqrt {\dfrac {3RT} {Mm}}}}[/tex]
T = temperature, Mm = molar mass of the gas particles , kg/mol
R = gas constant 8,314 J / mol K
v rms An unknown gas = 1/3 v rms H₂
v rms H₂ :
[tex]\tt v_{rms}=\sqrt{\dfrac{3\times 8.314\times 300}{2.10^{-3}} }\\\\v_{rms}=1934.22[/tex]
V rms of unknown gas =
[tex]\tt \dfrac{1}{3}\times 1934.22=644.74[/tex]
[tex]\tt 644.74^2=\dfrac{3\times 8.314\times 300}{M_{gas}}\\\\M_{gas}=18\times 10^{-3}~kg/mol[/tex]
What is the mass of sodium (Na) in 50 grams of table salt (NaCl)? Show
your work.
Calculate the amounts of each substance in the reaction below if an initial amount of 0.400 moles are brought together with an initial amount of 2.29 moles of Cl2 in a 1.00 L vessel
Complete Question
Calculate the equilibrium amounts of each substance in the reaction below if an initial amount of 0.400 moles of CO are brought together with an initial amount of 2.20 moles of Cl2 in a 1.00 L vessel and then equilibrium is established at 900 K. Kc at this temperature = 0.800. COCl2(g) CO(g) + Cl2(g)
Answer:
The amount of each substance at equilibrium is
[tex][COCl_2 ] = 0.282 \ M[/tex]
[tex][CO] = 0.12 \ M[/tex]
[tex][Cl_2] = 2.008 \ M[/tex]
Explanation:
From the question we are told that
The initial amount of CO is [tex]n_1 = 0.400[/tex]
The initial amount of [tex]Cl_2[/tex] is [tex]n_2 = 2.20 \ moles[/tex]
The volume of the vessel is [tex]V = 1.0 \ L[/tex]
The temperature is [tex]T = 900 \ K[/tex]
The equilibrium constant at the given temperature is [tex]K_c = 0.800[/tex]
The reaction is
[tex]COCl_2 \underset{}{\stackrel{}{\rightleftharpoons}} CO + Cl_2[/tex]
Now Generating an I C E table
[tex]COCl_2 \ \ \ \ \underset{}{\stackrel{}{\rightleftharpoons}} \ \ \ \ \ \ \ \ \ CO \ \ \ \ \ \ \ \ \ \ + \ \ \ \ Cl_2[/tex]
Initial [I] 0 0.400 2.20
Change [C ] + x -x - x
Equilibrium [E ] x 0.400- x 2.20 - x
Here x is the amount in terms of concentration by which [tex]COCl_2[/tex] and [tex]CO[/tex] and [tex]Cl_2[/tex] decreased during the reaction
Generally the equilibrium constant is mathematically represented as
[tex]K_c = \frac{[CO] [Cl_2]}{[COCl_2]}[/tex]
=> [tex]0.800 = \frac{[0.400 - x] [2.20 - x ]}{[x]}[/tex]
=> [tex]0.800 x = [0.400 - x ] * [ 2.20 - x ][/tex]
=> [tex]x = 0.282 \ M[/tex]
Generally at equilibrium the amount of [tex]COCl_2[/tex] present is
[tex][COCl_2 ] = 0.282 \ M[/tex]
Generally the equilibrium the amount of [tex]CO[/tex] present is
[tex][CO] = 0.400 - 0.282[/tex]
=> [tex][CO] = 0.12 \ M[/tex]
Generally the equilibrium the amount of [tex]Cl_2[/tex] present is
[tex][Cl_2 ] = 2.29 - 0.282[/tex]
=> [tex][Cl_2] = 2.008 \ M[/tex]
Convert the following word equation into a formula equation
fluorine + aluminum bromide → bromine + aluminum fluoride
Explanation:
Fluorine: F-
Aluminium: Al3+
Bromine: Br-
3F2 + 2AlBr3 => 3Br2 + 2AlF3
The balanced equation for the given chemical reaction can be given as
3F[tex]_2[/tex] + 2AlBr[tex]_3[/tex] [tex]\rightarrow[/tex] 3Br[tex]_2[/tex] + 2AlF[tex]_3[/tex]
What is balanced equation?An equation for just a chemical reaction is said to be balanced if both the reactants as well as the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of both the reaction have an equal balance of mass and charge.
The products and reactants of a chemical reaction are listed in an imbalanced chemical equation, but the amounts necessary to meet the conservation of mass are not specified.
The balanced equation for the given chemical reaction can be given as
3F[tex]_2[/tex] + 2AlBr[tex]_3[/tex] [tex]\rightarrow[/tex] 3Br[tex]_2[/tex] + 2AlF[tex]_3[/tex]
Therefore, the balanced equation for the given chemical reaction can be given as
3F[tex]_2[/tex] + 2AlBr[tex]_3[/tex] [tex]\rightarrow[/tex] 3Br[tex]_2[/tex] + 2AlF[tex]_3[/tex]
To know more about balanced equation, here:
https://brainly.com/question/29769009
#SPJ2
When combined in the correct ratio, hydrogen and oxygen atoms can form water as show
below. In this example, water is an example of which of the following? *
Hydrogen
Oxygen
Water
A mixture
Molecules of a compound
Atoms of a compound
Molecules of an element
Answer:
ok
Explanation:
hypothesize why carbohydrates are found in plant cell walls
Answer:
Plants can split starch into it's simpler glucose units for use as energy when needed. Cellulose is known as a structural carbohydrate because of the fibers formed by it's molecules. It is the major component of plant cell walls and comprises over half of the carbon found on planets.
Explanation:
I majored in Chemistry
All matter is involved in motion of some kind. True or false
Answer:
true
Explanation: all matter down to the molecular or even atomic level has a constant vibration and movement. The only time that any matter could stop moving would be at absolute zero.
________ is the enthalpy change when 1 mole of a substance is formed from its elements under standard conditions.
A. ΔHθc
B. ΔHθn
C. ΔHθf
D. ΔHθa
The correct answer is C. ΔHθf
We define the standard enthalpy of formation as the enthalpy change when one mole of a substance is formed from its elements under standard conditions. The standard conditions are 1 atm pressure, 273 K temperature and 1 M concentration.
The standard enthalpy of formation is denoted using the symbol ΔHθf.
Hence, ΔHθf is the enthalpy change when 1 mole of a substance is formed from its elements under standard conditions.
https://brainly.com/question/3640529
How many atoms of aluminum (Al) are in 3.94 mol of aluminum
Answer:
26.9
Explanation:
that is my answer I try to it
4. What do nutrigenomics and pharmacogenomics have in common?
Answer:
Individual genetic variation
Explanation:
is the common factor on which both pharmacogenomics and nutrigenomics are based.
A solution is prepared by dissolving 250 g of CH4N2O into 6.0 L of solution. What is the molarity of this solution?
________M
Answer:
Molarity = 0.65 M
Explanation:
Given data:
Mass of CH₄N₂O = 250 g
Volume of solution = 6.0 L
Molarity of solution = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Number of moles of solute:
Number of moles = mass/molar mass
Number of moles = 250 g/ 64.08 g/mol
Number of moles = 3.9 mol
by putting values,
Molarity = 3.9 mol / 6.0 L
Molarity = 0.65 M
HELP! ASAP!!! WILL MARK BRAINLIEST!!
Which of the following compounds in the main group is an alkali metal? Question 7 options: Beryllium (Be) Rubidium (Rb) Hydrogen (H) Strontium (Sr)
Answer:
Rb
Alkali Metals are Group 1 so
Rb it isnt Hydrogen because it is a gas
Explanation:
Which statement best describes how people within a country may be different? O People know that each region has the same traditions and culture. O People from different regions have different cultures, values and languages. O People believe that people from each region are equal to one another. O People think that mountainous regions are more important than others.
Answer:
its B People from different regions have different cultures, values and languages.
Explanation:
i just took the assignment
_____has particles with the greatest average kinetic energy
a
Ice water
b
Hot water
c
Warm water
d
Room temperature water
Answer:
c warm water
Explanation:
Kinetic energy is related to temperature. The molecules in a glass of warm water have more kinetic energy (they move faster – see Racing Molecules) than the molecules in a glass of cold water. The temperature of a substance is the average* amount of kinetic energy its molecules have.
Answer:
hot water
Explanation:
Help needed ASAP
= Select all that apply
Natural selection _____.
[] is random
[] cannot work if beneficial traits are not hereditary
[] is often called survival of the fittest
[] favors organism well adapted to the environment
Natural selection cannot work if beneficial traits are not hereditary
Answer:
favors organisms well adapted to the environment
cannot work if beneficial traits are not hereditary
is often called survival of the fittest
Explanation:
NOT
is random
happens by chance
how many atoms of hydrogen are in 420g sample of water
All living organisms are composed of
OA. at least three cells.
ОВ.
one or more cells.
OC. at least 100 cells.
OD. only one cell.
Answer:
OB- one or more cells
Explanation:
hope this helps :)
What are the predominant intermolecular forces in: Kr, CBr4, NaF, CH3OH, and ruby? Then rank by increasing boiling point.
Answer:
Kr- dispersion forces
CBr4- dispersion forces
CH3OH - dispersion forces, dipole interaction, hydrogen bonding
NaF- ionic
Kr-<CBr4<CH3OH<NaF
Explanation:
The magnitude of intermolecular forces influences the boiling points of substances. The stronger the intermolecular forces the higher the boiling point.
The strongest intermolecular forces here is the Ionic bond hence it accounts for the highest boiling point followed by CH3OH having hydrogen bonding.
Though Krypton and CBr4 both have dipole interaction, the higher relative molecular mass of CBr4 makes it to have a higher boiling point than Kr
There is an equal number of protons and __________ in a neutral atom.
A. electrons
B. neutrons
C. protons
D. elements.
the answer is electrons
What is the relationship between the circulatory and respiratory systems?
A. They work together to store the waste that blood collects from the body.
B. The circulatory system provides oxygen that the respiratory system uses to fill the lungs
C. The respiratory system provides blood that the circulatory system uses to transport nutrients.
D. They work together to supply oxygen to tissues and rid the body of carbon dioxide
Answer:
The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart
Explanation:
This should help you out
What is different about the atomic structure of the oxygen isotopes?
Answer:
Each isotope of oxygen contains 8 protons, but differs in the number of neutrons. An isotope number is a shorthand representation of its mass. Because protons and neutrons are roughly equal in mass, an isotope's number is equal to the sum of its protons and neutrons.
Explanation:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
What is tantalum's electron configuration?
Answer:
Xe 4f14 5d3 6s2
Explanation:
which of the following has the smallest radius? K+, K, Rb, Rb+
:
Option (c) is the correct answer.
Explanation:
It is known that when we move down a group then there is increase in size of atom. This is because there occurs increase in number of shells in the atom.
Also, when an atom loses electrons then it acquires a positive charge and size of the atom decreases. On the other hand, when an atom gain electrons then it acquires a negative charge and size of the atom increases.
Since, both Rb and K are same group elements and Rb has larger atomic size than K.
Hence, we can conclude that out of the given options K^{+}
+ has the smallest size.
Answer:
K+
Explanation:
Just took the quiz :)