PLZ HELP! An electron moved from a lower energy level to a higher energy level. What most likely happened during the transition?
Answers
Answer:
Explanation:B
Related Questions
Iron is the most commonly used metal iron is extracted in a blast fumace from iron
oxide using carbon monoxide.
Fe:03
Fe 300
A sample of the ore haematite contains 70% iron oxide.
Calculate the amount of iron oxide in 2000 tonnes of haematite.
tonnes
Amount of iron oxide =
Answers
Answer:
70/100 X 2000 = 1400 tonnes of iron.
Explanation:
take the percentage of iron oxide and divide with overall amount of iron oxide using 2000 tonnes of hematite ore. 1400 tonnes of iron will be produced. this is not the percentage. if you want the percentage of iron produced just divide.
70/100 x 200 = 1400 tonnes of iron
percentage of iron produced = 70/1400 x 100 = 5 % of iron produced from 70% of iron oxide in 2000 tones of hematite ore
Which of the following examples best illustrates an effect of pollution on an ecosystem?
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
Cutting down a forest for lumber removes available habitat for local animals, forcing them to move or compete for remaining resources.
(Choice B)
B
The number of wolves in an area declines due to urbanization and hunting, allowing elk and deer populations to grow rapidly.
(Choice C)
C
Nitrogen and phosphorus runoff from agricultural fields creates harmful algal blooms and dead zones in the ocean.
Answers
24. Which of the following pairs of solutions produce a precipitate when combined? A) Fe(NO); and KCI B) NH4Cl and AgNO3 C) KOH and NH C1 D) Na2SO, and KC1 /
Answers
The pairs of solutions produce a precipitate when combined are NH4Cl and AgNO3. Therefore, option B is correct.
What do you mean by precipitation ?Chemical precipitation is the process of turning a liquid into a solid by either making the liquid insoluble or making it extremely saturated.
The chemical reaction between potassium chloride and silver nitrate, in which solid silver chloride is precipitated out, is one of the best examples of precipitation reactions. This is the precipitation reaction's byproduct, the insoluble salt.
Thus, The pairs of solutions produce a precipitate when combined are NH4Cl and AgNO3, option B is correct.
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Suppose that 5.2 L of methane at a pressure
of 782 Torr is transferred to a vessel of volume
2.2 L. What is the final pressure of methane
if the change occurs at constant temperature?
Answer in units of Torr.
Answers
Answer:
Final pressure = 1848.36 Torr
Explanation:
Given that,
Initial volume, V₁ = 5.2 L
Initial pressure, P₁ = 782 Torr
Initial volume, V₂ = 2.2 L
We need to find the final pressure. We know that the relationship between pressure and volume is given by :
[tex]P\propto \dfrac{1}{V}\\\\\dfrac{P_1}{P_2}=\dfrac{V_2}{V_1}\\\\P_2=\dfrac{P_1V_1}{V_2}\\\\P_2=\dfrac{782\times 5.2}{2.2}\\\\P_2=1848.36\ torr[/tex]
So, the final pressure is equal to 1848.36 Torr.
Which watershed drains into Chesapeake Bay?
Label A
Label B
Label C
Label D
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Answer:
the correct answer is label D
Explanation:
label D is the only watershed that touches the chesapeak bay
If the student added larger drops to the pan, the
what?of the waves would increase.
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Answer:
this makes no sense you arent gonna get help
Explanation:
Answer:
Amplitude
Explanation:
Im taking this test rn lol
Li2O + MgCl2 → 2 LiCl + MgO
What type of reaction is going on in this equation.
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Answer:
water
Explanation:
I’m kinda stuck with this part of the paper
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Answer:
oK so pay pattention to the fractions
Explanation:
Why does energy spread out evenly if there's only a 21% chance that energy spreads out evenly?
Answers
Answer:
It has to do with increasing the entropy of the universe.
Explanation:
The modern definition of entropy is that it is the extent to which a system is able to disperse its energy. Energy (such as heat!) likes to spread itself out, so that as many states as possible are occupied with the least amount of energy.
Why were scientists unsure about the last common ancestor between apes and humans?
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Answer:
Scientists were unsure about the last common ancestor between apes and humans because fossils are so scarce, researchers do not know what the last common ancestors of living apes and humans looked like or where they originated.
Explanation:
Ethylenediaminetetraacetic acid EDTA is 41.09% C, 5.53% H, 9.58%N, and 43.8% O. What is the empirical formula of EDTA?
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Answer:
41.09% B N. The formula in EDTA
Explanation:
What type of observation can be stated with just numbers?
A. Qualitative
B. Sensory
C. Behavioral
D. Quantitative
Answers
Answer:
D. Quantitative
Explanation:
Quantitative observation deals with numbers, or amounts.
Qualitative observation deals with de- scriptions that cannot be expressed in numbers.
When an object is pushed by a force and moves in the direction of the force, work is done on the object. The amount of work equals the force times the distance (W = Fd). A small particle is pushed by a force of 2.6 × 10-4 newtons over a distance of 3.7 × 10-3 meters. How much work was done on the particle? Express the answer to the correct number of significant figures and in proper scientific notation. The force did × 10 newton-meters of work on the particle.
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Explanation:
[tex]workdone = force \times distance \\ W = (2.6 \times {10}^{ - 4} ) \times (3.7 \times {10}^{ - 3} ) \\ W = 9.62 \times {10}^{ - 7} \: joules[/tex]
The formula W = Fd, where W is the amount of work done, F is the force, and d is the distance, is used to determine how much work is done on a particle when it is pushed by a force. The force and distance in this issue are 2.6 10-4 newtons and 3.7 10-3 metres, respectively.
What is the way to calculate the work done ?We add the force and distance together to determine the work done: 9.62 10-7 newton-meters are equal to W = 2.6 10-4 newtons x 3.7 10-3 metres. The response must be presented using the appropriate scientific notation and significant numbers.
The solution should include three significant figures, just like the numbers in the problem, which have three. Therefore, 9.62 10-7 newton-meters is the correct answer.
This response uses appropriate scientific language.notation because the exponent is a negative power of 10 and the coefficient ranges from 1 to 10. In conclusion, the particle underwent work from the force of 9.62 10-7 newton-meters. This response uses the appropriate scientific notation and the correct number of significant digits.
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How are the concentrations of hydrogen ions and hydroxide ions related in an aqueous solution?
Answers
Arrhenius acid increases the concentration of hydrogen ion in an aqueous solution and Arrhenius base increases the concentration of hydroxide ion in an aqueous solution.
What is Arrhenius Acid and Base ?Arrhenius acid dissociates in aqueous solution to form hydrogen ion. In aqueous solution Arrhenius acid increases the concentration of hydrogen ions.
Arrhenius base dissociates in aqueous solution to form hydroxide ion. In aqueous solution Arrhenius base increases the concentration of hydroxide ions.
Hydrogen Ion [tex](H^+)[/tex] and Hydroxide Ion [tex](OH^{-})[/tex].In aqueous solution of hydroxide ions bases dissociates. Greater the concentration of base means greater the concentration of hydroxide ion. If hydroxide ion concentration is more then pH will be less.
Thus, we can say that Arrhenius acid increases the concentration of hydrogen ion in an aqueous solution and Arrhenius base increases the concentration of hydroxide ion in an aqueous solution.
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The temperature of a gas is decreased. What effect does this
have on the speed of the particles?
o The particles speed up.
o The particles slow down.
o The particles are destroyed.
The temperature has no effect on the speed of the
particles.
Answers
Explanation:
The temperature has no effect on the speed of the
particles.
How would the equilibrium of the reaction below be affected if the
temperature decreased?
200 kJ +2503(9)
702() +250 (9)
A. The reaction would shift to produce more SO3.
B. The reaction would shift to produce more O2 and SO2-
C. The reaction would produce less O2, SO2, and SO3.
D. The reaction would produce more O2, SO2, and SO3.
Answers
Answer:
B. The reaction would shift to produce more O2 and SO2-
Explanation:
This is because the forward reaction is exothermic.
The correct answer is option B. The reaction would shift to produce more O2 and SO2-
How would the equilibrium of the reaction below be affected if the temperature decreased?
A decrease in temperature will cause the equilibrium to shift to favour the exothermic reaction. Therefore the reverse reaction rate will decrease sharply, and then gradually increase until equilibrium is re-established.
When the temperature has increased the equilibrium will shift to the?
If the temperature is increasing, a product is being added to the equilibrium, so the equilibrium shifts to minimize the addition of extra product: it shifts back toward reactants.
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A certain metal M forms a soluble sulfate salt M2SO4. Suppose the left half cell of a galvanic cell apparatus is filled with a 50.0mM solution of M2SO4 and the right half cell with a 5.00M solution of the same substance. Electrodes made of M are dipped into both solutions and a voltmeter is connected between them. The temperature of the apparatus is held constant at 20.0°C.
Which electrode will be positive?
Left
Right
Answers
Answer:
Right
Explanation:
The given parameters are;
The soluble sulfate formed by the metal, M = M₂SO₄
In the galvanic cell formed by the metal M, we have;
The concentration of M₂SO₄ in the left half cell = 50.0 mM = 0.05 M
The concentration of M₂SO₄ in the right half cell = 5.00 M
In the galvanic cell, the metal 'M' will be dissolved into the solution with lower concentration as M²⁺ which is the left half cell, making the cell negative and the solution more concentrated
In the right half cell, the metal 'M²⁺' in the solution will be plated unto the electrode making the solution less concentrated and the electrode in the right half cell will be the positive electrode
Therefore;
The electrode which will be positive is the electrode in the right half cell.
help pls it's about cells
Answers
Yep
How
Yep
The Soil conservation method in which mountain slope is cut into step is..
Answers
Answer:
Terracing.
Explanation:
Soil formation occurs as a result of the the decay or the remains of plants and animals which are used up.
Weathering can be defined as the physical and chemical breakdown of rock into smaller pieces called sediment. Weathering can be classified into two categories namely;
I. Physical weathering : it is the process of breaking rocks into pieces without affecting its chemical composition e.g temperature, abrasion and frost action.
II. Chemical weathering : it is the process of breaking rocks into pieces by chemical action which leads to changes in its chemical composition e.g carbonation, hydration, plant acid and oxidation.
Soil conservation can be defined as the use of various techniques so as to prevent the loss of the top most later of the soil and protecting it from degradation. Thus, the fertility of the soil is maintained.
The soil conservation method in which mountain slope is cut into step is terracing.
Answer:
Terracing
Explanation:
The Soil conservation method in which mountain slope is cut into step is Terracing.
The pH of a solution is 2.55. What is the [H3O+]?
Answers
Answer:
[H₃O⁺] ≈ 0.00282 M
General Formulas and Concepts:
Acid/Base Equilibria
Bronsted Acid/Bronsted Base
pH Formula: pH = -log[H₃O⁺]
[H₃O⁺] Formula: [tex]\displaystyle [H_3O^+] = 10^{-pH}[/tex]
Explanation:
Step 1: Define
pH = 2.55 (Acidic)
Step 2: Solve
Substitute in pH [Molar Concentration Formula]: [tex]\displaystyle [H_3O^+] = 10^{-2.55}[/tex]Evaluate exponent: [tex]\displaystyle [H_3O^+] = 0.002818[/tex]Step 3: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.002818 M ≈ 0.00282 M
Which physical property causes cork to float on top of water?
Answers
Discuss some of the biotic (living) and abiotic (nonliving) factors in the chimps’ ecosystem that affect their behavior.
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Answer:
Diet: fruit, leaves, bark, stems, seeds, eggs, insects, birds, small to medium sized primates - red tail monkeys, yellow baboons, bushbuck and warthogs.
Environmental Relationship - The chimpanzee keeps the plants it eats short, moves dirt around which helps things living in the dirt, keeps bird and small monkey populations that it eats from overpopulating.
Different biotic and abiotic factors affect why the chimps live where they do. (Spatial Relationships)
Explanation:
If today is October 22nd and we view a new moon, on what date will we observe the next first quarter?
a. October 5th
b. October 8th
c. October 15th
d. October 29th witch oneeee i need it done like rn
Answers
Answer:
The answer is C
Explanation:
Why can’t sound vibrations travel in outer space? *
Your answer
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Answer:
Sound does not travel at all in space. The vacuum of outer space has essentially zero air. Because sound is just vibrating air, space has no air to vibrate and therefore no sound. ... Radio is a form of electromagnetic radiation just like light and can therefore travel through the vacuum of space just fine
Be + Cl₃N -----> Cl₂ + Be₃N₂ *
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Answer:
3Be + 2NCl₃ ⟶ 3Cl₂ + Be₃N₂
-TheUnknownScientist
what are the products in a chemical reaction?
Answers
Answer:
it's c trust me
Explanation:
c cause it's c
Answer:
d
Explanation:
i dont know
makes the most sense to me
why are so many products made from plastic ?
Answers
Explanation:
Plastic takes time to degrade which means it has great longevity. Plastic does not break as easily as glass or other materials. It lasts long and offers great service. Plastic storage containers offer greater flexibility than any other packaging materials.
help please, thank you:)
Answers
Answer:
1.67 × 10⁻¹⁰m is the answer.
Explanation:
Given,
4 × 10⁻⁷m thick
2400 atoms thick
therefore 1 atom,
Diameter = 4 × 10⁻⁷/2400
d = 4000 × 10⁻¹⁰/2400
d = 1.67 × 10⁻¹⁰m
∴ diameter of 1 gold atom (3 significant figures) = 1.67 × 10⁻¹⁰m
what are the properties of gas, liquid and solid.
Answers
Explanation:
The particles in solids are tightly packed, whereas the particles in liquid move around each other. The particles in gas move around quickly in all directions. Solids can only vibrate, but liquids and gas have some space for movement,
A surfact that DOES NOT allow water to pass through.
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Answer:
impermeable
Explanation:
Answer:
aquifer?
Explanation: