Answer:
There are 13 core electrons in a sodium atom.
⚠️⚠️⚠️⚠️HELPPP⚠️⚠️⚠️⚠️
A 250 kg rock falls off a cliff and comes to a rest on the ground, which is 40m below the cliff. At what point is the rock’s kinetic energy at maximum?
Answer:
at 39m
Explanation:
because thats where gravitational potential energy has been acting on it the most before it hits the ground.
pretty sure btw
sodium chloride is a compound of sodium and chlorine. which of these elements is the alkali metal and which is the halogen. why
Answer:
Chlorine is a halogen and sodium is an alkali metal.
Explanation:
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Question~}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
Solve this question ~
Find the Hybridization of N in compound " NH3 " and determine its shape ~
Let's check Electronic configuration of N in ground state
[tex]\\ \sf\longmapsto 1s^22s^22p^3[/tex]
In exited state[tex]\\ \sf\longmapsto 1s^22s^22px^12py^12pz^2[/tex]
3 p orbitalsIn hydrogen case
[tex]\\ \sf\longmapsto 1s^1[/tex]
1 s orbitalHence Hybridization
[tex]\\ \sf\longmapsto s-p-p-p[/tex]
[tex]\\ \sf\longmapsto sp^3[/tex]
Structure is tetrahedral .
Spare way:-
Bond pairs==3=>Bonding electrons=6Lone pair=1=>Anti bonding electrons=2Hybridization
[tex]\\ \sf\longmapsto \dfrac{1}{2}[\sigma+\sigma *][/tex]
[tex]\\ \sf\longmapsto \dfrac{1}{2}[6+2][/tex]
[tex]\\ \sf\longmapsto \dfrac{1}{2}[8][/tex]
[tex]\\ \sf\longmapsto 4[/tex]
sp3 HybridizationShape-Tetrahedral .The gain of electrons by an element or ion in a reaction is called __.
A. fractionation
B. Disproportionation
C. Oxidation
D. Reducing
Answer:
Reduction
Explanation:
took the test
Which of the following are phase changes? (Select all that apply.)
melting
gases
sublimation
reactions
Answer:
- melting
- sublimation
Explanation:
A phase change is a, well, change between phases. Solid to liquid. Gas to solid. Etc. Gases is a phase, but not a change. Reactions is a change, but not a phase change. This leaves us with melting (solid to liquid) and sublimation (solid to gas).
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- Heather
What are the features that allow you to identify an ionic compound based on its chemical formula
Answer:
first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge.
Explanation:
2- Bromo – 2 – methyl propane is :
(a) Primary alkyl halide
(b) Secondary alkyl Halide
(c) Tertiary alkyl amine
(d) Tertiary alkyl Halide
Answer:
(B) SECONDARY ALKYL HALIDE
In the malate-aspartate shuttle, _____ is reduced to _____ in the cytosol. oxaloacetate; malate aspartate; malate malate; aspartate malate; oxaloacetate aspartate; oxaloacetate
The malate-aspartate shuttle enables oxidative phosphorylation by allowing electrons to be moved across the inner membrane in the mitochondrion during glycolysis in eukaryotes.
In this malate-aspartate shuttle, oxaloacetate is reduced to malate in the cytosol.
During this biochemical system process, the cytosolic malate dehydrogenase which is the primary enzyme present in this shuttle system catalyzes the reaction of oxaloacetate and NADH to produce malate and NAD in the cytosol. This system enables oxidative phosphorylation in eukaryotes.Learn more: https://brainly.com/question/17216910
Which is one factor that adds to the greenhouse effect?
a decrease in the amount of dust in the atmosphere
a decrease in the amount of water on Earth’s surface
an increase in gases in the atmosphere that absorb heat
an increase in the amount of solar radiation that reflects into space
Answer:
C
Explanation:
Edge 2022 trust the process
Knowing about the greenhouse effect we have that what intensifies this effect is an increase in gases in the atmosphere that absorb heat.
What is the greenhouse effect?Greenhouse effect is a natural atmospheric phenomenon responsible for the maintenance of life on Earth. Without the presence of this phenomenon, the temperature on Earth would be very low, around -18ºC, which would make the development of living beings impossible.
Thus, the main cause of the greenhouse effect is industrialization. Due to this process, the burning of fossil fuels has intensified in recent centuries. The main products of the combustion reaction of these reagents are the gases mentioned above as the main ones for the greenhouse effect.
See more about greenhouse effect at brainly.com/question/1577730
things which are matter but not substance
Answer:
Vacuum
Explanation:
It may be bounded by a volume. Energy: Light, heat, kinetic and potential energy, and sound are non-matter because they are massless. Objects that have mass and are matter may emit energy.
Convert 4.0 moles of krypton into liters of krypton.
Answer:
4.0 moles of krypton converts to 89.6L.
Explanation:
To convert moles to liters, remember that at standard temperature and pressure (STP), 1 mole is equal to 22.4 liters. Multiply your mole value - in this case, 4.0 - by the molar volume constant, 22.4L, to convert moles into liters. 4.0 x 22.4 is equal to 89.6, thus your answer is 89.6L.
We can check this by dividing 89.6 by 4.0, which will give us the molar volume constant 22.4L, proving that this answer is correct.
Indique cuáles son las unidades de la molaridad *
eq-g/m³
eq-g/L
mol/cm³
mol/L
Answer:
hm
Explanation:
To form a charge of +2 an atom must________electrons.
To form -3 it must ________ electrons.
Multiple choice:
1) gain2 ;lose 3
2) gain3: lose2
3) lose2;gain3
4) lose3; gain2
Answer:
Explanation:
3
what do you put in the turkey cavity when not using stuffing
reagents that can be used to convert CH3MgBr to CH4 are?
a) H2O
b) CH3-C - - -(triple bond) CH
c) R3CH
d)H2C=CH2
Answer:
reagents that can be used to convert CH3MgBr to CH4 are?
a) H2O
b) CH3-C - - -(triple bond) CH
c) R3CH
d)H2C=CH2
its a) H20
Select the atom that will attract the electron pair (:) more strongly (the atom with the greater electronegativity)
HELP PLEASE
which compound is soluble in excess ammonia solution. A. Copper (II) sulphate B. iron (II) chloride. C.Magnesium chloride. D. Magnesium Chloride
Some single-celled organisms make copies of themselves through mitosis. Which describes the function of the cell cycle in such single-celled organisms?
Answer:
mitosis?
Explanation:
Some single celled organisms make copies of themselves through mitosis
In unicellular organisms such as bacteria, mitosis is a type of asexual reproduction, making identical copies of a single cell. In multicellular organisms, mitosis produces more cells for growth and repair.
What is the white solid that quickly forms when the methyl salicylate is added to the sodium hydroxide solution
1. What are five examples of observable properties?
the largest source of anthropogenic greenhouse gases in the united states is
Answer:
Human activities are responsible for almost all of the increase in greenhouse gases in the atmosphere over the last 150 years. The largest source of greenhouse gas emissions from human activities in the United States is from burning fossil fuels for electricity, heat, and transportation.
Write a 4-6 sentence paragraph using science vocabulary, full sentences, proper grammar, and details explaining the difference between plant cells and animal cells. Science...
Answer:
Plant cells and animal cells are both eukaryotic cells. They both have a nucleus, Golgi complex, endoplasmic reticulum, ribosomes, mitochondria, cytoskeleton and cell membrane. Only plants cells have a vacuole, cell wall and chloroplast, while animal cells have cilia, centrioles and lysosomes which plant cells don't usually have. Because of their cell walls plant cells are in rigid rectangular shapes while animal cells have looser round shapes. The main difference in their functions is that animals don't produce their own food while plan cells do.
What will a wave look like with high amplitude and long wavelength?
A. Tall and narrow
B. Short and narrow
C. Tall and wide
D. Short and wide
Answer:
A tall and narrow A tall and narrow
Explanation:
Answer:
A. Tall and Narrow
Explanation:
The frequency of a wave is inversely proportional to its wavelength. That means that waves with a high frequency have a short wavelength, while waves with a low frequency have a longer wavelength. But high amplitude waves tend to be short spent and tall narrow linings.
_KOH+_H3PO4=_K3PO4+_H2O
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The balanced chemical equation for given reaction is ~
[tex] \sf{3KOH + H_3PO_4 \rightarrow K_3PO_4 + 3H_2O}[/tex]A chemist heats a fixed amount of gas in a sealed glass container. Which law is the chemist most likely
investigating? (1 point)
O Charles's law, by seeing how changes in temperature affect the volume of the gas
O Charles's law, by seeing how changes in temperature affect the pressure of the gas
O Gay-Lussac's law, by seeing how changes in temperature affect the volume of the gas
O Gay-Lussac's law, by seeing how changes in temperature affect the pressure of the gas
The chemist is most likely investigating Gay Lussac's law. To study the changes in temperature affect the pressure of the gas when a fixed amount of gas is heated in a sealed glass container. Therefore, option (D) is correct.
What is Gay Lussac's law?Gay-Lussac's law states that when the volume of the gas is kept constant the pressure of a gas is directly proportional to the absolute temperature.
The mathematical expression of Gay Lussca's law can be written as follows:
P/T = k
It can be also represented as the pressure being directly proportional to the temperature of the gas.
P ∝ T (where V volume of gas is constant)
or
[tex]\frac{P_1}{T_1} =\frac{P_2}{T_2}[/tex]
Where P₁ and T₁ are the initial temperature and pressure of the gas. The P₂ and T₂ are the final temperature and pressure of the gas.
As the container is sealed on heating the volume of the gas will not change. On increasing the temperature the molecules of the gas acquire more and more kinetic energy. So the pressure of the gas will increase.
Therefore, the chemist is investing the Gay-Lussac's law by noticing how changes in temperature affect the pressure of the gas.
Learn more about Gay Lussac's law, here:
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What happens to the ionizing rate if the steps of ionizing polyprotic acid increases?
Answer:
An acid that contains more than one ionizable proton is a polyprotic acid. The protons of these acids ionize in steps. The differences in the acid ionization constants for the successive ionizations of the protons in a polyprotic acid usually vary by roughly five orders of magnitude.Answer:
What happens to the ionizing rate if the steps of ionizing polyprotic acid increases? Well they have this stepwise ionization process occurs for all polyprotic acids
Explanation:
Which of the following shows a valid combustion reaction?
2Al + 2O2 → 2AlO + O2
C2H4 + 3O2 → 2CO2 + 2H2O
2CH4 + O2 → 2CO + 4H2
Ca + O2 → CaOH
Combustion reaction means two common products
CO_2H_2OOption B is correct
[tex]\\ \sf\longmapsto C_2H_4+O_2\longrightarrow 2CO_2+2H_2O[/tex]
Would results of solubility of sugar dissolving in water change if a person used a different solute?
Answer:
If a solute is a solid or liquid, increasing the temperature increases its solubility. For example, more sugar can dissolve in hot water than in cold water. If a solute is a gas, increasing the temperature decreases its solubility. For example, less carbon dioxide can dissolve in warm water than in cold water.
Explanation:
which is larger 0.45 mol of a material or 2.75×10^23 of the same material?
Which of the following typically increases the rate of a chemical reaction? А avoiding the use of a catalyst B heating the reaction C increasing the volume of the reaction vessel D decreasing the concentration of the reactants
B: heating the reaction
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