Answer:
This can be proved by the following activity: Take some Iron fillings and dip them in the Copper sulphate solution. After some time you will notice that there is a colour change in the solution which is caused due to the displacement of Copper from it solution.
Explanation:
calculate the enthalpy for the reaction D + F = G + H using
G + C = A + B deltaH = 277
C + F = A delta H = 303
D = B + H delta H = -158
The enthalpy for the reaction : ΔH = -132
Further explanationGiven
Reaction and the enthalpy
Required
the enthalpy
Solution
Hess Law
Reaction 1 reverse :
A + B = G + C ΔH = -277
Reactions 2 and 3 remain the same (unchanged)
C + F = A ΔH = 303
D = B + H ΔH = -158
Add up all the reactions and remove the same compound from two different sides
D + F = G + H ΔH = -132
Which tool could be used to measure the mass of a rock?
A. Measuring cup
B. Digital thermometer
C. Triple-beam balance
D. Graduated cylinder
A substance that dissolves another substance is a _____________________
A. Solvent
B. Solute
Answer:
b it is easy its b
Explanation:
Answer:
B
Explanation:
hi can someone help me quickly please its for chemistry
Answer:
Explanation:
The atom X has 1 1 protons (atomic number) and thus would have 11 electrons. This means the atom X would have 1 valence electron in it's outermost shell. While the atom Y has 17 protons (atomic number) and thus would have 17 electrons. This means the atom Y would have 7 electrons in it's outermost shell.
The type of bond this atoms (X and Y) would form is an Ionic (or electrovalent) bond. This bond/combination involves the transfer of electron(s) and a molecule is not formed as seen in the image below.
A radioisotope forms a stable isotope after it undergoes radioactive decay. Which is the best conclusion to draw from this statement?
A. It undergoes alpha decay. B. It undergoes beta decay. C. It does not participate in a decay series. D. It does not have a long half-life.
Answer:
C. It does not participate in a decay series.
Explanation:
From this statement, we can deduce that a radioisotope that forms a stable isotope after it undergoes radioactive decay suggests that it does not participate in a decay series.
It could have emitted any form of radioactive particles which can be alpha or beta. We do not know if it has a long or short half life because the value is not given. But since the radioactive decay in one step produces a stable isotope, we can conclude that it did not participate in a decay series. A decay series involves a radioactive decay in multiple steps.Answer:
C
Explanation:
because that's just the answer:)
2020.is crazy
2021 is_____??!?!?
Answer:
zany
Explanation:
Answer:
a fresh start
Explanation:
How do jet streams affect temperature and precipitation?
a. affect temperature, but not precipitation
b. pull cold air from the equator; storms tend to form along the jet stream
c. pull cold air from the poles; storms tend to form along the jet stream
d. do not affect temperature or precipitation
A boy and girl are running with the same speed.if the mass of the boy is 20 times that of girl find the kinectic energy
Answer:
The kinetic energy of the boy is 20 times that of the kinetic energy of the girl.
Explanation:
It is given that,
The mass of the boy is 20 times that of girl.
Let [tex]m_b[/tex] and [tex]m_g[/tex] are the mases of boy and the girls.
A boy and girl are running with the same speed.
The formula for the kinetic energy is given by :
[tex]E=\dfrac{1}{2}mv^2[/tex]
Where m is mass and v is speed
As speed is same for both boy and girl.
Kinetic energy of a girl,
[tex]K_g=\dfrac{1}{2}m_gv^2[/tex] ...(1)
As [tex]m_b=20m_g[/tex]
Kinetic energy of a boy,
[tex]K_b=\dfrac{1}{2}m_bv^2\\\\=\dfrac{1}{2}\times 20m_g\times v^2\ ....(2)[/tex]
From equation (1) and (2) :
[tex]\dfrac{K_g}{K_b}=\dfrac{\dfrac{1}{2}m_gv^2}{\dfrac{1}{2}m_bv^2}\\\\=\dfrac{\dfrac{1}{2}m_gv^2}{\dfrac{1}{2}\times 20 m_gv^2}\\\\\dfrac{K_g}{K_b}=\dfrac{1}{20}\\\\K_b=20K_g[/tex]
So, the kinetic energy of the boy is 20 times that of the kinetic energy of the girl. Hence, this is the required solution.
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:
If energy absorbed is less than energy emitted does temperature increase or decrease?
Answer:
temperature increases energy
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]
Based on the replacement reaction, what would the products of the reaction be?
BeSO4 + 2NH4OH → Be(
)2 + (NH4)2SO4
BeSO₄ + 2NH₄OH → Be( OH)₂ + (NH₄)₂SO₄
Further explanationGiven
Reaction
BeSO₄ + 2NH₄OH → Be( ...)₂ + (NH₄)₂SO₄
Required
The products
Solution
There are two possible displacement reactions
Single replacement if one element replaces or reduces another element in the compound and forms a new compound
A + BC ⇒ AC + B
Double replacement if both the cations and anions of the two compounds in the reactant swap positions to form 2 new compounds in the product
AB + CD ⇒ AD + CB
Thus, the product is Be(OH)₂
Answer:
OH
Explanation:
describe Bohr’s model of the atom consisted of a central
surrounded by electrons moving in specific
Answer:
The answer to this question is given below in the explanation section.
Explanation:
The Bohr model depicts an atom as a small, positively charged nucleus surrounded by electrons.These electrons travel in circular orbit around the nucleus similar in structure to the solar system,except electrostatic forces rather than gravity provide attraction.Electron orbit around the nucleus resembles that of planets around the sun in the solar system.
The Bohr model was an improvement on the earlier cubic model(1902),the plum pudding model(1904) the saturnine model (1904) the rutherford model (1911) since the Bohr model is a quantum physics based modification of the Rutherford may source combine the two:the Rutherford-Bohr model
Although revolutionary at the time,the Bohr model is a relatively primitive model of the hydrogen atom compared to the valence shell atom.As an initial hypothesis it was derived as a first order approximation to describe the hydrogen atom.Due to its simplicity and correct results for selected systems.
In 913 Bohr suggested that electrons could only have certain classical motions:
Electrons in atoms orbit the nucleus.The electrons can only orbit stably,without radiating in certain orbits at a certain discrete set of distances from the nucleus.These orbit are associated with definite energies and are also called energy shells or energy levels.Electrons can only gives or lose energy by jumping from one allowed orbit to another,absorbing or emitting electromagnetic radiation with a frequency (v) determined by the energy difference of the levels according to the plank relation.The technetium-99 isotope has a half-life of 6.0 hours. If 100.0 mg were injected into a
patient how much remains after 18 hours?
Answer:
12.5mg of technetium-99 remain
Explanation:
When a radioactive isotope decays in the time, its concentration follows the equation:
ln[A] = -kt + ln[A]₀
Where [A] could be taken as the mass of radioactive isotope after time t (18h),
k is rate constant = ln 2 / Half-Life = ln 2 / 6hours = 0.1155hours⁻¹
[A]₀ is initial amount of the isotope = 100.0mg
Replacing:
ln[A] = -0.1155hours⁻¹ *18hours+ ln[100.0mg]
ln[A] = 2.5257
[A] =
12.5mg of technetium-99 remain
What is the mass of an object, when the volume of it is 50.0 mL and the density is 1.5
g/mL?
Answer:
75 g
Explanation:
Mass=Density x Volume so therefore you do the density which is 1.5 g/mL times the volume which is 50.0 mL so you get 75 g because the mL cancel out in the label!
How do I know if something is either a nonpolar or polar substance?
Answer:Read explanation
Explanation:
A polar molecule has a net dipole as a result of the opposing charges (i.e. having partial positive and partial negative charges) from polar bonds arranged asymmetrically. Water (H2O) is an example of a polar molecule since it has a slight positive charge on one side and a slight negative charge on the other. A non polar substance we be the opposite of what I said
Question 6 of 10
What is an anode?
A. The electrode that is oxidized in a galvanic cell
B. The solution inside a salt bridge
C. The electrode that is reduced in a galvanic cell
D. The electrolytes around an electrode
SUBMIT
Answer:
I believe the answer is A, sorry if i'm wrong
Explanation:
What would be the effect of removing NH3 from this reaction? 3H2 + N2 2NH3 A. Hz and N2 would react to produce more NH3. B. The remaining NH3 would react more to produce more H2 and Nz. O C. The reactions in both directions would slow down. D. The reactions in both directions would speed up.
A. H₂ and N₂ would react produce more NH₃
Further explanationGiven
Reaction
3H₂ + N₂ ⇔ 2NH₃
Required
The effect of removing NH₃
Solution
If the concentration of one component is enlarged, the system reaction is to reduce the component, and vice versa, if the concentration of one component is reduced, the reaction system is to add to the component
When NH₃ is taken from the system, then
The system will react by increasing the concentration of products by moving to the right ⇒ Shift in the direction of the product
Answer:
A. Hz and N2 would react to produce more NH3.
Explanation:
Describe what is ionic bonding and how it happens.
Answer:
Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
Explanation:
Answer:
Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
Explanation:
MAGNESIUM (Mg)
+FLUORINE (F) =
Answer:
MgF2 magnesium fluoride
Will give Brainliest!
30 Points!
Which of the following elements has properties different than the rest?
A:H
B:K
C:N
D:O
Answer:
K
Explanation:
its not a gas but the other's are.
As an electron in an atom moves from the ground state to the excited state, the electron...?
Answer:
Absorbs energy
Explanation:
As an electron in an atom moves from the ground state to the excited state, the electron absorbs energy.
Electrons moves around in permissible orbits around the nucleus of an atom.
An electron in a certain energy level has a definite amount of energy associated with it at that level. When an electron in ground state absorbs energy, it moves to a higher energy level. When an electron in excited state loses energy, it moves to a lower energy level.The transition of electrons from one level to another involves loss or gain of energy.
How many moles do you have in 17.23 grams of Cu(SO4)2
Answer:
0.06739 mol Cu(SO₄)₂
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
17.23 g Cu(SO₄)₂
Step 2: Identify Conversions
Molar Mass of Cu - 63.55 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Cu(SO₄)₂ - 63.55 + 2(32.07) + 8(16.00) = 255.69 g/mol
Step 3: Convert
[tex]17.23 \ g \ Cu(SO_4)_2(\frac{1 \ mol \ Cu(SO_4)_2}{255.69 \ g \ Cu(SO_4)_2} )[/tex] = 0.067386 mol Cu(SO₄)₂
Step 4: Check
We are given 4 sig figs. Follow sig fig rules and round.
0.067386 mol Cu(SO₄)₂ ≈ 0.06739 mol Cu(SO₄)₂
A chemical combination of two or more atoms is a(n) .
volume
molecule
chemical bond
isotope
Answer:
Molecule
Explanation:
Its simple definition
350 coulombs of charge flows through an iron in 70 seconds. What is the current flowing through the iron
what is the most massive object in our solar system
1. 100gm of a 55% (M/M) nitric acid solution is to be diluted to 20% (M/M) nitric acid.
How many liters of water should be added to the starting solution?
Answer:
The volume of water to be added is 0.175 liters of water
Explanation:
The given concentration of the nitric acid = 55% (M/M)
The mass of the nitric acid solution = 100 gm
The concentration solution is to diluted to = 20% (M/M)
The 100 g 55%(M/M) nitric acid solution gives 55g nitric acid in 100 g of solution
Therefore, to have 20% (M/M) nitric acid solution with the 55 g nitric acid, we get
Let "x" represent the volume of the resulting solution, we have;
20% of x = 55 g of nitric acid
∴ 20/100 × x = 55 g
x = 55 g × 100/20 = 275 g
The mass of extra water to be added = The mass of the 20%(M/M) solution solution of nitric acid - The current mass of the 55%(M/M) solution of nitric acid
The mass of extra water to be added = 275 g - 100 g = 175 g
Volume = Mass/Density
The density of water ≈ 1 g/ml
∴ The volume of water to be added that gives 175 g of water = 175 g/(1 g/ml) = 175 ml. = 0.175 l
The volume of water to be added = 0.175 liters of water.
how many total electrons can the d orbital hold
Answer:
10 electrons
Explanation:
The d sublevel has 5 orbitals, so can contain 10 electrons max. And the 4 sublevel has 7 orbitals, so can contain 14 electrons max. In the picture below, the orbitals are represented by the boxes. You can put two electrons in each box.
Answer:
10
Explanation:
you're welcome
When we mix water and sugar then they made
Why do scientists often use bacteria to produce medicines?
Answer:
Bbbbb eg2020
Explanation:
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