how many valence electrons does sr2+ have
Answer:
8 valence electrons
Explanation:
Explain the structure of an atom.
[tex]\huge\purple{Hi!}[/tex]
An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. This nucleus contains most of the atom's mass and is composed of protons and neutrons (except for common hydrogen which has only one proton). All atoms are roughly the same size. A convenient unit of length for measuring atomic sizes is the angstrom (Å), which is defined as 1 x 10-10 meters. The diameter of an atom is approximately 2-3 Å.
In 1897, J. J. Thomson discovered the existence of the electron, marking the beginning of modern atomic physics. The negatively charged electrons follow a random pattern within defined energy shells around the nucleus. Most properties of atoms are based on the number and arrangement of their electrons. The mass of an electron is 9.1 x 10-31 kilograms.
One of the two types of particles found in the nucleus is the proton. The existence of a positively charged particle, a proton, in the nucleus was proved by Sir Ernest Rutherford in 1919. The proton's charge is equal but opposite to the negative charge of the electron. The number of protons in the nucleus of an atom determines what kind of chemical element it is. A proton has a mass of 1.67 x 10-27 kilograms.
The neutron is the other type of particle found in the nucleus. It was discovered by a British physicist, Sir James Chadwick. The neutron carries no electrical charge and has the same mass as the proton. With a lack of electrical charge, the neutron is not repelled by the cloud of electrons or by the nucleus, making it a useful tool for probing the structure of the atom.
Even the individual protons and neutrons have internal structure, called quarks. Six types of quarks exist. These subatomic particles cannot be freed and studied in isolation. Current research continues into the structure of the atom.
right 9 in a equation
Answer:
x+y = 12
Explanation:
shfb gfgjj ghjj dvgg ggggg ghggs ufac t g dgyyh
Concentrated HCl is 15 M (15 molar). A 500 mL quantity of this solution is diluted by adding water to give a final volume of 2.5 L. What is the molarity of the resulting solution
The molarity of the resulting solution obtained by diluting the stock solution is 3 M
Data obtained from the question Molarity of stock solution (M₁) = 15 MVolume of stock solution (V₁) = 500 mL Volume of diluted solution (V₂) = 2.5 L = 2.5 × 1000 = 2500 mL Molarity of diluted solution (M₂) =? How to determine the molarity of diluted solutionM₁V₁ = M₂V₂
15 × 500 = M₂ × 2500
7500 = M₂ × 2500
Divide both side by 2500
M₂ = 7500 / 2500
M₂ = 3 M
Thus, the volume of the resulting solution is 3 M
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The pressure of x ml of a gas was increased from 2 atm to 4 atm at constant temperture. what will be the new volume?
The new volume of the gas given the data from the question is 1/2X mL
Data obtained from the question
Initial volume (V₁) = X mL
Initial pressure (P₁) = 2 atm
New pressure (P₂) = 4 atm
New Volume (V₂) = ?
How to determine the new volume
The new volume of the gas can be obtained by using the Boyles’ law equation as illustrated below:
P₁V₁ = P₂V₂
2 × X = 4 × V₂
2X = 4V₂
Divide both side by 4
V₂= 2X / 4
V₂ = 1/2X mL
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Circulacion de electrones en un material conductor en determinado tiempo.
Answer:
falso
Explanation:
tiempo no determinado El circulation de elctrones
3. Humans discovered how to use fire and tools. How was this knowledge passed along to younger generations?
Communication skills were developed so knowledge could be passed along to younger generations.
Primitive knowledge was instinctive so that the basic skills of fire and tools came naturally to everyone.
Younger people were forced to spend long hours building fires and making tools.
O The younger generations were able to figure out how to use tools on their own.
Communication skills were developed so knowledge could be passed along to younger generations.
How knowledge will pass through generations?Knowledge will pass from one generation to another with the help of education. The skill people give education to their youngers about fire and tools. In this way, skills of fire and tools pass from one generation to another.
So we can conclude that communication skills were developed so knowledge could be passed along to younger generations.
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Answer:
A
Explanation:
Decomposition occurs when...
Answer:
Decomposition begins at the moment of death, caused by two factors: 1.) autolysis, the breaking down of tissues by the body's own internal chemicals and enzymes, and 2.) putrefaction, the breakdown of tissues by bacteria.
Explanation:
hope it will help you
4.
A dead alkaline battery is found to contain a compound of manganese and oxygen. Its percentage composition
is 70.0% Mn and 30.0% O. What is the empirical formula of this substance?
The dead battery with a percentage composition of 70.0% Mn and 30.0% O has the empirical formula Mn₂O₃.
What is an empirical formula?An empirical formula is the minimal relationship between the atoms in a chemical formula.
A dead alkaline battery is 70.0 % Mn and 30.0 % O. To find the empirical formula, we will divide each percentage by the molar mass of the element.
Mn: 70.0/54.94 = 1.27O: 30.0/16.00 = 1.88Then, we divide both numbers by the smallest one.
Mn: 1.27/1.27 = 1O: 1.88/1.27 ≈ 1.5Finally, we multiply both numbers by 2 so that they are whole numbers.
Mn: 1 × 2 = 2O: 1.5 × 2 = 3The empirical formula of the compound is Mn₂O₃.
The dead battery with a percentage composition of 70.0% Mn and 30.0% O has the empirical formula Mn₂O₃.
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Classify each of the following as a homogeneous and heterogeneous mixture
Soda water, wood, air, soil, vinegar, filtered tea
Soda water, wood, air, soil, vinegar, filtered tea.
Answer:
Homogeneous mixtures : Soda water, vinegar and filtered tea. Heterogeneous mixtures : Wood and soil.
One atomic mass unit ( 1 amu)
is equal to the mass of a carbon-12 atom multiplied by the quantity
Answer: 1/12
Explanation:
A carbon-12 atom has a mass of 12 amu, so multiplying this by 1/12, we get 1 amu.
Question 2 of 35
Which two phrases describe ice storms?
A
A. Temperatures way below freezing
B. A large amount of snow falling
C. Temperatures near freezing
D. A large amount of ice forming
Please help!
An ice storm is a temperature below freezing resulting from large amount of snow falling, i.e., options A and B.
What is ice storm?Freezing rain causes ice storms. Raindrops travel into a tiny layer of below-freezing air near the earth's surface, where they freeze on contact with the ground, trees, automobiles, and other things.
Ice forms when cold rain freezes in contact with surfaces below the freezing point.
Thus, the correct options A and B.
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Assume a parent isotope has a half-life of 100 million years. How old is a sample that
contains 15% of its original parent isotope?
250 million years
270 million years
200 million years
100 million year
Answer:
270 million
Explanation:
1/2 ^n = .15 (.15 is 15% in decimal)
log both sides
n log (1/2) = log (.15 )
n = 2.737 half lives
EACH half life is 100 million
2.737 * 100 million = 273.7 million
Which reaction takes place in a nuclear fission reactor?
OCH N
→
239
O Pu+ He 242 Cm
94
96
O 27 Co+He→Co+n
139
O 235 U+n Kr+¹Ba+3/n
56
92
The reaction that takes place in a nuclear fission reactor is as follows: 235/92 U + 1/0n 94/36Kr + 139/56 Ba + 3/0n.
What is a nuclear fission reactor?A nuclear fission reactor is the place where nuclear chain reactions occur that produce energy by fission.
Nuclear fission is the nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.
Therefore, the option that involves the splitting of atoms into smaller ones is as follows: 235/92 U + 1/0n 94/36Kr + 139/56 Ba + 3/0n.
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How many grams of SO2 would you need to dissolve in 100g of 40 degree water to make a saturated solution?
If you heated the solution to 90 degrees would the new solution be unsaturated, or supersaturated?
The grams of SO₂ that would be dissolved in 100 g of 40 degree water to make a saturated solution can be calculated by making solubility curve.
What is mass?Mass is the quantity of matter of a physical body.
If you want to calculate the mass of Sulfur dioxide in 100 g of 40 degree, you have to make a solution curve.
With the increase in temperature, the solubility increases as well
Thus, the grams of SO₂ that would be dissolved in 100 g of 40 degree water to make a saturated solution can be calculated by making a solubility curve.
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23 Which device requires electrical energy to
produce a chemical change?
(3) voltaic cell
(1) electrolytic cell
(2) salt bridge
(4) voltmeter
Answer:
electrolytic cell
Explanation:
Electrolytic cell used electrical energy to do electrolysis.
Then by using oxidation and reduction ions produced it does produce chemical changes
Option A
The process of seeping of water into the ground in called
Answer: Infiltration
Explanation: it is the process by which surface water, rainwater or snowmelt seeps into the ground
The chemical colchicine is used in the production of karyotypes. Colchicine prevents spindle fibers from forming during the cell cycle. What is a result of preventing spindle fibers from forming?
The result of preventing spindle fibers from forming is mitotic division stops in metaphase and cannot proceed to anaphase.
What is colchicine?Colchicine is a drug use to remove swelling and decrease the amount of uric acid production.
It prevents the formation of spindle fibers during the cell cycle.
Thus, the correct option is C.
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What is the volume of the sphere? 8 cm
Perform the following operation
and express the answer in
scientific notation.
9.80x10-3 + 1.60x10-4
[ ? ]x10
Answer:
11.40x10-7
Explanation:
9.80+1.60x10-3-4
11.40x10-7
Identify the balanced chemical equation that represents a single displacement reaction.
CF 4 + 2Br 2 ⟶ CBr 4 + 2F 2
3H 2SO 4 + 2Al ⟶ Al 2(SO 4) 3 + 3H 2
CF 4 + Br 2 ⟶ CBr 4 + F 2
3H 2SO 4 + 2Al ⟶ Al 2(SO 4) 3 + H 2
3H₂SO₄ + 2Al₂(SO₄)₃ → Al₂(SO₄)₃ + 3H₂ is the balanced chemical equation that represents a single displacement reaction.
What is a balanced chemical equation?The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation.
3H₂SO₄ + 2Al₂(SO₄)₃ → Al₂(SO₄)₃ + 3H₂
In this type of reaction, one substance is replacing another:
A + BC → AC + B
In a single displacement reaction, atoms replace one another based on the activity series. Elements that are higher in the activity series. Also, if the element that is to replace the other in a compound is more reactive the reaction will occur. If it is less reactive, there will be no reation.
In the first equation, fluorine is more reactive than bromine. Therefore, bromine cannot replace bromine.
In the second equation, the displacement is between hydrogen and aluminium. Hydrogen is lower in the activity series, this implies that aluminium will replace it.
Hence, 3H₂SO₄ + 2Al₂(SO₄)₃ → Al₂(SO₄)₃ + 3H₂ is the balanced chemical equation that represents a single displacement reaction.
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A solid chloride E which sublimes on heating reacted with an alkali F to give a choking gas G.G turns red litmus paper blue . identify E, F and G
Answer:
E:ammonium chloride
F:sodium hydroxide
G:ammonia
Which change to a DNA molecule would have the least effect on an organism? an addition to a base sequence at the beginning of a gene a deletion from a base sequence in the middle of a gene a substitution in a base sequence that does not code for a protein a substitution that creates a “stop” code in the middle of a gene
Answer:
Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.So A: an addition to a base sequence at the beginning of a gene
Explanation:
This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.
An example of polytamic anoin would be a. Ca+2 b. NH4+ c. F d. PO4-3
[tex]PO_4^{-3}[/tex] and [tex]NH^{4+}[/tex] are polyatomic anions composed of two or more atoms.
What is a polyatomic anion?A polyatomic ion is an ion composed of two or more atoms. Examples: The hydroxide cation ([tex]OH^-[/tex]) and the phosphate cation ([tex]PO_4^{3-}[/tex]) are both polyatomic ions.
[tex]PO_4^{-3}[/tex] and [tex]NH^{4+}[/tex] are the polyatomic anions because both contain more than 1 atom.
Hence,[tex]PO_4{-3}[/tex] and [tex]NH^{4+}[/tex] are polyatomic anions composed of two or more atoms.
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Check Your Learning
What mass of CO is required to react with 25.13 g of Fe2O3
according to the equation Fe₂O3 + 3 CO2 Fe + 3CO₂?
Answer:
convert the 25.13 g of Fe2O3 into moles by dividing by its molar mass (159.69) to get that. When looking at the stoichiometric coefficients, we can see that for every 1 mole of Fe2O3, there needs to be 3 moles of CO.
Explanation:
How many moles of carbon dioxide are there in 52.06 g of carbon dixoide
Answer:
Moles of substance are defined ratio of the given mass of the substance to the molar mass of the substance.
Given :
The 52.06 grams of carbon dioxide.
To find :
The moles of carbon dioxide.
Solution:
The mass of carbon dioxide = 52.06 g
The molar mass of carbon dioxide = 44.01 g/mol
The moles of carbon dioxide:
1.183 moles of carbon dioxide are there in 52.06 g of carbon dioxide.
Explanation:
HELP NEED DONE ASAPP BEFORE 11:59PM!!!!
Predict the total pressure in Container C if the initial pressure in Container A was tripled and. Container B was reduced by one-third then mixed in Container C.
Container A Oxygen 287 kPa
Container B Nitrogen 429 kPa
Container C Oxygen + Nitrogen
Pressure
=
P total
Answer:
I think B sorry if wrong
Explanation:
have a good day
How many moles of O2 are formed from 1.252 g of HgO?
Moles of Hg
Given mass/Molar mass1.252/200.590.006mol2 moles produce 1 mol O2
1 mol produces 1/2mol O_2
0.006 mol produces
0.006(0.5)0.003mol
Which fundamental force allows you to use a compass?
O A. Strong nuclear
OB. Gravitational
C. Weak nuclear
OD. Electromagnetic
PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
ITS B
Explanation:
MY CONSCIOUS MIND IS TELLING ME