Answer:
Oxygen has 6 valence electrons and follows the octet rule.
If you were drawing a lewis structure for O2, there would be a total of 12 valence electrons (6 x 2 = 12).
The completed structure would have a double bond between the two oxygen atoms with 2 lone pairs per oxygen, giving you a total of 8 electrons that are lone pairs (or dots).
Why is mining for coal a long-term concern?
A. It is being replenished faster than it can be mined.
B. The supply will eventually be exhausted.
C. New methods of mining need to be developed.
D. The demand for coal is diminishing.
Answer: Is B: the supply will eventually be exhausted.
Explanation:
there is only so much coal in the world as in many other elements. That is why we are looking for more appropriate and resourceful way of supplying energy and it is a lot safer for the workers involved
As coal is a nonrenewable source of energy so its supply will eventually be exhausted. Therefore, option (B) is correct.
What are nonrenewable sources of energy?Non-renewable energy can be described as energy that comes from fossil fuels such as coal, natural gas, crude oil, and uranium. Non-renewable energy requires human intervention to create it suitable for consumption. Fossil fuels are generally made up of Carbon. Fossil fuels were produced over 300 million years ago.
Non-renewable energy is generally fossil fuels such as coal, oil, natural gas, etc. Fossil Fuels are produced from the remains of animals and plants and can be is divided into three categories.
To produce natural gas from fossil fuels, the decomposition process is longer and conducted with high amounts of pressure and heat. Coal takes millions of years under the crust of the earth to produce through the decomposition of trees, plants, and ferns.
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HELP SOON PLEASE THIS IS DUE TONIGHT! I WILL GIVE BRAINLIEST!
In an experiment where you use wires, a 9 volt battery, and a light bulb; what would be the best conductor to put on the ends of the wires? Please rate the following solution/liquids and their brightness from 1-5
-Tap water
-Baking soda
-Vinegar
-Coca Cola (or any soda, I guess)
Answer:
I would say baking powder maybe or you should try tap water
Answer:
1st one - tap water (ill go over them one by one to help you understand why)
Its honestly rather vinegar or tap water but if I would go with tap water however I could be wrong. I don't take your class lol
Step by step:
First, tap water includes a lot of ions and contaminants. As a result, tap water only contains ions capable of conducting electricity. As a result, tap water is an excellent electrical conductor.
2nd) Ammonia and baking soda are both weak bases. When weak electrolytes dissolve in water, the resulting solution has a low conductivity.
Third, because it releases H+ and CH3COO- ions, the mobility of these ions in the solution assists in electrical conduction. As a result, vinegar is a good electrical conductor.
4th) When dissolved in water, soda compounds (chemicals mostly containing sodium) include ions, and ions assist conduct electricity. As a result, it does not conduct because it lacks ions or charged particles.
WILL MARK BRAINLY
Under what conditions will a low temperature make a reaction spontaneous?
O A. If AH and AS are both positive
O B. If AH and AS are both negative
O c. If a catalyst is used in the reaction
O D. If the reaction is endothermic
Answer:
B
Explanation:
If AH and AS are both negative will a low temperature make a reaction spontaneous.
What is Spontaneous reaction?A spontaneous reaction is a reaction that favors the formation of products at the conditions under which the reaction is occurring. A roaring bonfire (see figure below) is an example of a spontaneous reaction.
A fire is exothermic, which means a decrease in the energy of the system as energy is released to the surroundings as heat.
The products of a fire are composed mostly of gases such as carbon dioxide and water vapor, so the entropy of the system increases during most combustion reactions.
Therefore, If AH and AS are both negative will a low temperature make a reaction spontaneous.
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what is an ion?what are the two ways to which an ion can be made?
Answer:
please give me brainlist and follow
Explanation:
ion
Home
Science
Chemistry
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physics
BY The Editors of Encyclopaedia Britannica | View Edit History
ion, any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations; negatively charged ions, anions. Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms. Examples of these processes include the reaction of a sodium atom with a chlorine atom to form a sodium cation and a chloride anion; the addition of a hydrogen cation to an ammonia molecule to form an ammonium cation; and the dissociation of a water molecule to form a hydrogen cation and a hydroxide anion.
During autumn, days grow colder. What happens to the nights?
They grow brighter.
They grow shorter.
They grow warmer.
They grow longer.
Answer:
I thinks its they grow longer explaination: I have a massive brain
Answer:
Brighter
Explanation:
does exercise increase, decrease or have no effect on the amount of carbon dioxide you exhale
Answer:
It increases the amount you exhale
Explanation:
The more you exercise and make your body work, the more oxygen you inhale which causes you to let out more carbon dioxide than if you were just resting.
What is the hydroxide concentration in a 0.20 M potassium acetate solution?
Answer:
Molar concentration of potassium hydroxide
= 0.27 Mol liter/approx
List the steps in naming covalent compounds.
1. Name the non-metal furthest to the left on the periodic table by its elemental name.
2. Name the other non-metal by its elemental name and an -ide ending.
3. Use the prefixes mono-, di-, tri-.... to indicate the number of that element in the molecule.
4. If mono is the first prefix, it is understood and not written
Answer:
Rules for naming simple covalent compounds:
1. Name the non-metal furthest to the left on the periodic table by its elemental name.
2. Name the other non-metal by its elemental name and an -ide ending.
3. Use the prefixes mono-, di-, tri-.... to indicate the number of that element in the molecule.
4. If mono is the first prefix, it is understood and not written
Examples:
N2O4 is called dinitrogen monoxideCO2 is called carbon dioxideCO is called carbon monoxideN2O is called dinitrogen monoxide. (It is also called nitrous oxide but that is another naming scheme.)CCl4 is called carbon tetrachlorideHere is a chart of those prefixes:
1 - mono
2 - di
3 - tri
4 - tetra
5 - penta
6 - hexa
7 - hepta
8 - octa
9 - nona
10 - deca
Determine the amount of grams present in 3.25x1024 atoms of Lithium.
Tin has the atomic number Sn (Z = 50).
(a). Give its electronic structure
(b). Is it one of the transition metals?
(c). Knowing that it loses its electrons in pairs and that the 4d subshell is not affected. What are the possible degrees of oxidation for this element?
Tin has electron configuration [Kr] 5s²4d¹⁰5p² and it is not a transition element because its outermost orbitals are 5s² 5p². It has oxidation states of +2 and +4.
The electron configuration of tin is [Kr] 5s²4d¹⁰5p². The electronic structure of an atom shows the arrangement of electrons in the atom of an element. The electrons are arranged in sub-shells.
Tin is not a transition metal because it has a completely filled d sub-shell and its outermost shell consists of ns, np orbitals.
Tin looses its electrons in pairs. Remember that the outermost orbitals are 5s² 5p². This means that tin can have two stable oxidation states, +2 and +4.
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What is a small description of a molecule
Answer:
molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance.
Give one example of a question that science could test. Then, explain in your own words why it is an example of a scientific question. Please!
Answer:
Questions are an essential part of science. ... They state the final question in a way that can be answered by investigation or experiment. A good scientific question is: “What effect does the pH of water have on radish seed germination?” Good scientific questions are defined, measurable, and controllable.
John Dalton thought that atoms
1. Cannot be broken down further
2. Have no mass
3. Contain molecules
4. Are all composed of carbon
Answer:
cannot be broken down further
what is the molarity of Li in a solution that contains of 46.552ppm lithium ferrocyanide Li3fe(cn)6
Answer:
hgfdjsuejssj_uyghgjiyr656⁸8⁴83jbv
Describe how you could show by adding aqueous sodium hydroxide and aqueous ammonia that a solution contained zinc ions.
Answer:
Learning Task 3. Solving word problems involving multiplication of deci-
the
A cstep in solving word problems. Do these in your notebook. ),
1. A clerk is paid P 45.25 per hour for 40 hours a week, 1.50 times the
regular rate for overtime and double the rate for a holiday. How much
holiday?
2. fofkmputer programmer earns a regular hourly rate of P50.00. If he
worked 42.75 hours in a week, how much did he earn?
3. Arthur earns P1350.00 a day. He sets aside 0.10 of this for savings.
How much does he save in a month?
4. Mr. Fernandez has a monthly pay of P 5,450. The tax deducted from
year?
5. Dianne works 2.5 hours a day from Monday to Friday and 3.75 hours
his a
on Saturday. If he is paid P25.00 per hour, how much does he earn in
a
week?
Explanation:
Learning Task 3. Solving word problems involving multiplication of deci-
the
A cstep in solving word problems. Do these in your notebook. ),
1. A clerk is paid P 45.25 per hour for 40 hours a week, 1.50 times the
regular rate for overtime and double the rate for a holiday. How much
holiday?
2. fofkmputer programmer earns a regular hourly rate of P50.00. If he
worked 42.75 hours in a week, how much did he earn?
3. Arthur earns P1350.00 a day. He sets aside 0.10 of this for savings.
How much does he save in a month?
4. Mr. Fernandez has a monthly pay of P 5,450. The tax deducted from
year?
5. Dianne works 2.5 hours a day from Monday to Friday and 3.75 hours
his a
on Saturday. If he is paid P25.00 per hour, how much does he earn in
a
week?
.. How many seconds will it take for a satellite to travel 650 km at a rate of 220 m/s?
Answer: 3750s Happy To Help
Explanation:
What mass of carbon dioxide is produced from the complete combustion of 4.60x10^-3g of methane?
Answer:
Explanation:
CH4 + 2O2 ==> CO2 + 2H2O
mols CH4 = grams/molar mass
Using the coefficients in the balanced equation, convert mols CH4 to mols CO2.
Now convert mols CO2 to grams. g = mols x molar mass.
Protons and neutrons have opposite, but equal magnitude, charges. An atom contains the same number of protons and electrons Neutrons and electrons are found in the nucleus of an atom. Protons have about the same mass as electrons. Electrons make up most of the mass of an atom. which one is true about subatomic particles
Answer:
the true statement is an atom contains the same number of electron and protonExplanation:
let us see the behaviour of the sub atomic particles
nutrons and protons found in the nucleus of an atoman atom have the same number of electron and proton but they have different chargenutron is chargeless particlemost mass of the atom concentrated in the nucleus of an atomelectrons have almost 0 mass from an atommass of proton and mass of nutron are equvalent or almost equalthere are many properties of subatomic particles i have listed some of them above .
I think it is help ful for youDetermine whether the bonds in CCl4 and N2 are polar or non-polar. If the bond is polar, assign the partial positive and negative charges. Electronegativity values: C = 2.5, Cl= 3.0, N= 3.0
Refer to the attachment
According to the molecular geometry, bonds in carbon tetrachloride are polar and that in nitrogen are non polar.
What is molecular geometry?Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.
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If 5.0g nitrogen dioxide completed reacted, how many grams of nitric acid would form?
Answer:
71847284737283774737373737
60) Which of the following is a chemical property?
A) Sugar is a solid at room temperature.
B) Potassium reacts with water to form potassium hydroxide.
C) Sugar dissolves in water.
D) Gasoline and water do not mix.
.
Answer:
C is the answer. Sugar Dissolves in water
Explanation:
Brainliest Maybe
Sugar dissolves in water is a chemical property. Therefore, option C is correct.
What do you mean by chemical properties ?Chemical properties describe a substance's characteristic ability to react to form new substances; they include flammability and corrosion susceptibility. A pure substance's chemical and physical properties are the same in all samples.
A chemical property is the ability or inability to change one type of matter into another. Chemical properties include flammability, toxicity, acidity, reactivity, and heat of combustion.
A chemical property explain the ability of a substance to undergo a specific chemical change. To verify a chemical property, we look for a chemical change.
Thus, Sugar dissolves in water is a chemical property, option C is correct.
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Oxalic acid is a diprotic acid with a first dissociation constant Ka1 = 0.0537 and a second dissociation constant Ka2 = 5.42×10-5. Consider all the species in equilibrium with each other in a 0.45 M solution. Note that the first acid dissociation constant is pretty large. This acid is almost a strong acid.
Part 1:
What is the concentration of undissociated oxalic acid in the 0.45 M oxalic acid solution?
Part 2:
What is the concentration of hydrogen oxalate?
Part 3:
What is the concentration of oxalate?
Part 4:
What is the concentration of hydronium?
Part 5:
What is the concentration of hydroxide?
Part 6:
What is the pH of the solution?
Answer:
50 points for this easy question
6. What is true about Calcium (Ca)?
A. It is a very unreactive metal.
B. It is reactive and is found with nonmetals in nature.
C. naturally uncombined with other elements.
D.It is a very reactive nonmetal.
Answer:
C. naturally uncombined with other elements.
Explanation: Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air.
helppppppppppppppppppppppppppp
Answer:
It's also true
Explanation:
the answer is written in this question
I hope that helps
Identify which of the following equations are balanced and which ones are not balanced
A. CH4 +202 —> CO2 + 2H20
B. 6CO2 + 6H2O—> C6H12O6+602
C. 2Na + H2O —> 2NaOH+ H2
Answer:
A. balancedB. UnblalancedC. UnbalancedExplanation:
What is this atom structure?
How many grams of potassium (K) contain 5.11 x 10^22 atoms of potassium?
The atomic mass of K is 39
from Avogadro's law
39g of K contains 6.02x10^23 atoms
therefore if
39=6.02x19^23
X=5.11×10^22
making X the subject of the formula
X= (5.11×10^22×39)÷6.02×10^23
X= 33g
The statement, that describes grams of potassium (K) contain 5.11 × [tex]10^{22}[/tex] atoms is "33.1 g."
What is an atom?An atom is a fundamental particle of matter that contains at least one proton.
1 mole will be of 6.022 × [tex]10^{23}[/tex] atoms
Then,
[tex]= 5.11*10^{22} \;atoms\;.\;\frac{1\;mol}{6.022*10^{23} \;atoms} \;.\;39.098\;g/mol\\\\= 33.171\;g[/tex]
≈ 33.1 g
As a result, 33.1 g of K contains 5.11 × [tex]10^{22}[/tex] atoms.
Hence, the correct option is 33.1 g.
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HELPPPPPP
Calculate the frequency of light with a wavelength 559nm
Answer:
Refer to the attachment
How will you describe the appearance of a saturated solution?
Answer:
A saturated solution is one where there are equal numbers of particles, or solutes, and solvent in the solution.
Explanation:
The characteristics of a solvent are that it can be a liquid, a solid, or a gas; although the solvent is usually a liquid. When a solution cannot have solute added and dissolved, the solution is saturated.
Explanation:
A saturated solution is one where there are equal numbers of particles, or solutes, and solvent in the solution
helpppppppppppppppppppppppppp
Answer:
B
Explanation:
Answer:
B
Explanation:
U can read the second part