Calculate the energy required to excite a hydrogen electron from level n=1 to level n=3.
Answer:
The energy required is 1.634×J, the wavelength is 1.215×m, and the kind of electromagnetic radiation is the ultraviolet radiation.
Explanation:
In the question above, the initial level = 1, and = 2. Then, we use Rydberg's equation to calculate the wavelength of the light absorbed by the atom during the transition.
6.
Which of the following is NOT an example of a chemical change?
A. burning wood
B. the production of simple sugars through photosynthesis
C. fermentation of sugars into alcohol
D. grinding wood into sawdust
Answer:
D
Explanation:
Is glycosphingolipid and Sphingomyelin same?
Answer:
Yes, they are same
Explanation:
Glycosphingolipids are a subtype of glycolipids containing the amino alcohol sphingosine. They may be considered as sphingolipids with an attached carbohydrate. Glycosphingolipids are a group of lipids (more specifically, sphingolipids) and are a part of the cell membrane.
Answer:
glycosphingolipid is an example of sphingomyelin
What is the maximum concentration of Ag⁺ that can be added to a 0.00620 M solution of Na₂CO₃ before a precipitate will form? (Ksp for Ag₂CO₃ is 8.10 × 10⁻¹²)
For the maximum concentration of Ag+ is mathematically given as
x = 3.6×10−5
What is the maximum concentration of Ag⁺ that can be added to a 0.00620 M solution of Na₂CO₃ before a precipitate will form?Generally, the Ksp equation for this reaction is mathematically given as
[tex]K_{sp}=[Ag^+]^2[CO_3^{2-}][/tex]
[CO3^2-]=0.00620M
Ksp =[Ag+}^2 x 0.00620
8.1x10^-12 = x^2 x 0.00620
x = [tex]\sqrt{8.1*10^{-12}/0.00620}[/tex]
x = 3.6×10−5
In conclusion, the maximum concentration of Ag⁺ is
x = 3.6×10−5
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For the reaction, determine the equilibrium constant and identify if the reaction is reactant or product favored at equilibrium
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's calculate Equilibrium constant for the following reaction. [tex] \sf{K_c} [/tex]
if we balance the equation, we will get :
[tex] \qquad\sf{C_{(s)}+ CO_2\:{(g)} \leftrightarrow2\: CO_{(g)}} [/tex]
According to question ~
[tex] \qquad \sf{K_c = \dfrac{[CO]²}{[CO_2]}} [/tex][tex] \qquad \sf{K_c = \dfrac{({5.4×10}^{-5})²}{({8.3×{10}^{-6}}} }[/tex][tex] \qquad \sf{K_c = \dfrac{(29.16×{10}^{-10})}{({8.3×{10}^{-6}}}} [/tex][tex] \qquad \sf{K_c = \dfrac{{29.16 }}{{8.3}} ×{10}^{-4}}[/tex][tex] \qquad \sf K_c = 3.51×{10}^{-4} [/tex]What is the formula for calculating pH?
O A. pOH= [H*]
————
[OH -]
B. pH = -log[OH-]
C. pH = -log[H+]
D. pH = log[ht]
Answer:
c. pH=-log[H+]
Explanation:
pH=-log10[H+]
If a 50.00 mL of 0.0155 M HI(aq) is mixed with 75.00 mL of 0.0106 M KOH(aq), what is the pH of the final solution
If a 50.00 mL of 0.0155 M HI(aq) is mixed with 75.00 mL of 0.0106 M KOH(aq), the pH of the final solution is mathematically given as
pH=13.16
What is the pH of the final solution?Generally, the equation for the Chemical reaction is mathematically given as
2HI+Ba(OH_2)--->BaI2+2H2O
Therefore
pOH=-log{OH}
pOH=-log(6.52)
pOH=0.8142
In conclusion, for the pH
pH+pOH=14
pH=14-0.8142
pH=13.16
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A 100g piece of iron at 150oC is emersed in 268.5 g of water at 20oC. the temperature of both iron and water became 25oC. If the specific heat of iron is 0.449 J/g.K, find the specific heat of water?
Answer:
cW = 4.2J/g.k
Explanation:
Heat gained = Heat lost
iron(mc∆€) = water(mc∆€)
mi= 100g
ci = 0.449
∆€i= 150-25 = 125
...
mw= 268.5g
cw = ?
∆€w=25-20 = 5
...
100×0.449×125= 268.5×cw×5
5612.5= 1342.5cw
cw = 5612.5/1342.5
cw= 4.18 ~ 4.2J/g.K
When 96 grams of oxygen are produced, how many grams of hydrogen must react
according to the equation 2H2+O2--> 2H20?
A. 12
B. 6
C. 48
D. 24
m A 10.00g sample of a substance is found to contain 5.12g of water. What is the percent by of water in the compound? A
. 5.12% B. 4.88% C. 48.8% D. 51.2%
Answer:
The answer is D) 51.2%
Explanation:
5.12g of 10.00g of the substance is water:
percentage of water= 5.12 x 10.00 =51.2%
Answer:
b
Explanation:
Which reaction represents a nuclear reaction?
CO2+H2O→H2CO3
2Na+Cl2→2NaCl
92238U→90234Th+24He2+
2H2O2→2H2+O2
92238U→90234Th+24He2 is a Niclear reaction
Nuclear reaction involves Nuclear elements.
It is usually defined as spontaneous emission of electrons.
Uranium 238 is a nuclear element
The reaction that represents a nuclear reaction is : ( C ) 92238U→90234Th+24He2+
What is a nuclear reaction?A nuclear reaction is a process whereby two nuclei collide to form one or more nuclides. There are 4 different types of nuclear reaction and they are ;
FissionFusionNuclear decayTransmutationUranium 238 is a nuclear element therefore the reaction involving Uranium 238 is a nuclear reaction.
Hence we can conclude that The reaction that represents a nuclear reaction is : ( C ) 92238U→90234Th+24He2+
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1. If the water is not completely removed from the salt during the heating process will the reported water-to-salt mole ratio (X) be high or low? Explain
Answer:
The water in the hydrate (referred to as "water of hydration") can be removed by heating the hydrate. When all hydrating water is removed, the material is said to be anhydrous and is referred to as an anhydrate.
Explanation:
If the water is not completely removed from salt during heating process it will result in higher mole ratio of water to salt as mass of water will also be accounted while calculating mole ratio.
What is salt?Salt is defined as a chemical compound which is ionic in nature and consists of cation and an anion.It has no net electrical charge as the charges are completely neutralized in case of salts.
They are classified as acidic, basic or neutral salts depending on the ions they produce on dissolution.They have wide variety of colors depending on the elements from which they are formed and have five basic tastes.Salts are usually odorless except a few exceptions . They are highly soluble in water and are insulators in the solid state, to make them conductive they need to be melted or dissolved.
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Scenario A: 100 g of glucose in the presence of unlimited oxygen is metabolized through aerobic respiration.
Scenario B: 100 g of glucose in the absence of oxygen is metabolized through anaerobic respiration.
Would the mass of products produced in Scenario A be greater than, less than, or equal to the mass of products produced in Scenario B? Justify your answer.
A 25.0 g sample of N2 gas, has a volume of 50.0 L and a pressure of 630. mm of Hg. What is the temperature of the gas? Universal Gas Constant, R = 62.4 L.mm Hg/mole.K
Answer:
565.4 K
Explanation:
Remember PV = nRT
630 * 50 = 25/28 * 62.4 T
T = 565.4 kelvin
possible cause of water hammering?
Answer:
At home, a water hammer may occur when a dishwasher, washing machine or toilet shuts off water flow. The result may be heard as a loud bang or repetitive banging since the shock wave travels back and forth in the plumbing system.
How can you tell that Mercury is not a gas giant?
A.
because it is dense and rocky
B.
because of where it orbits the sun
C.
because it has only one moon
D.
because it has no ring system
Answer:
The answer to this question is A.
hope it helps :)
2. Calculate and express the following in the correct units with the correct number of
significant figures
(a) 7.310 km + 5.70 km
(b)(3.26 x 10^-3mg)-(7.88 x 10^-5 mg)
(c) (4.02 x 10^6dm) + (7.74 x 10^7dm)
(d) (7.8 m - 0.34 m) + (1.15 s +0.82 s)
Answer:
Socratic app
Explanation:
it will help you
Man is circled here in blue in the Quaternary Period. Locate it. Compare the location of man to the entire history of the world (the beginning of the spiral at the bottom left). What do you notice about the amount of water vs the amount of land as you spiral upward? Why do you think that is? What do you notice about the complexity of life as you spiral upward? Why do you think that is?
Answer:The upward spiral theory of lifestyle change explains how positive affect can facilitate long-term adherence to positive health behaviors. The inner loop of this spiral model identifies nonconscious motives as a central mechanism of behavioral maintenance.
Explanation://
Which of the following is a valid mole ratio from the balanced equation 2Fe2O3 + 3C --> 4Fe + 3CO2?
2 mol Fe2O3
4 mol Fe
4 mol C
3 mol Fe
2 mol Fe2O3
4 mol C
3 mol C
4 mol CO2
Answer:
From the given balanced equation, the valid mole ratio is four moles of Fe over 3 moles of moles of c02..
Explanation:
Mole ratio can be defined as the ratio of mole compound with the another.
What is required in addition to oxygen to create a high
temperature flame?
Answer:
Oxygen enrichment of combustion air to increase flame temperatures by reducing the proportion of nitrogen used in the combustion process is of particular value to operators of high-temperature furnaces.
Read the passage on the California Zero-Emission Vehicle Program. Should automobile makers be made to adhere to quotas of zero-emission vehicles set by states, even if it causes automakers to lose revenue?
Transport media is a significant pollution source by emitting gasses and particles. YES. Automobile makers should adhere to quotas for zero-emission vehicles.
What are the Zero-Emission vehicles?
These are cars, trucks, and buses that mostly run on electricity. The pollution degree caused by these vehicles is highly reduced compared with ordinary vehicles because of the reduction in fuel use and the consequent reduction in gasses and other substances emissions.
There are three types of zero-emission vehicles
Hybrids vehicles that combine gasoline and electricityFully electric vehicles that run entirely on electricityHydrogen cells vehicles that use hydrogen gas to produce electricity
Currently, and for decades, transport media are one of the most significant sources of gasses and other polluting substances emissions that lead to an increase in the greenhouse effect and global warming. Some of them are mentioned in the article -VOCs, nitrogen oxide, carbon monoxide, and dioxide, hydrocarbon-.
These are all primary pollutants suspended in the air that can produce secondary pollutants.
The mentioned pollutants could be significantly reduced by substituting transport media or improving the combustion processes. This last goal could be achieved by using alternative fuels and technologies or by using catalytic converters.
A considerable reduction in pollutant emissions from Zero-Emission Vehicles has already been proven in many countries. So several actions and regulations should be done about it to decrease even more -to near-zero- gasses and other particles emission. And more countries should be involved.
Following this thinking line, the answer is YES. Automobile makers should adhere to quotas of zero-emission vehicles set by states, even if it causes automakers to lose revenue.
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A soil sample of 2.65g was analyzed and found to contain 0.0625mg of Ca2+ and 2.45*10^-3g of Mg2+.Classify each analyte based on its level in the soil sample
Based on the milligram per Kg of soil sample of each analyte, calcium ion, Ca2+ and magnesium ion, Mg2+ are both classified as macronutrients.
What are soil nutrients?Soil nutrients are minerals which are found present in the soil and which are required by plants for their growth and development.
Soil nutrients can be classified based on amount needed by plants as well as the amount present in the soil into:
micronutrients- present in small amounts (<100 mg/kgmacronutrients- present in relatively larger amounts (>100 mg/kg)The mg/Kg of each analyte in the soil sample is as follows:
mass of soil sample = 2.65 g = 0.00265 kg
Calcium ion:
amount per mg/Kg of soil sample = 0.625mg/0.00265 kg
amount per mg/Kg of soil sample = 236 mg/kg
Magnesium ion:
0.00245 g = 2.45 g
amount per mg/Kg of soil sample = 2.45 mg/0.00265
amount per mg/Kg of soil sample = 924 mg/Kg
Therefore, calcium ion, Ca2+ and magnesium ion, Mg2+ are both classified as macronutrients.
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A certain orbital has four nodes in total. Which of the following could it be?
-5s
-5p
-5d
-5f
-all
Answer:
5p
Explanation:
We know
Number of Nodes =n-l
i)5s
n=5
l=0
Number of nodes=5-0=5
ii)5p
n=5
l=1
Number of nodes=5-1=4
Hence correct option is option b 5P
Atomic orbitals are the property that explains the position of the electron. 5p orbital has four nodes in total. Thus, option B is correct.
What are nodes?Nodes are the point in the orbit where the electron density is zero and is given by n-1.
In 5s the n = 5, l = 0 so, number of nodes = 5. In 5p, n = 5, l = 1, so nodes = 4. In 5d, n = 5, l = 2, so nodes = 3, and in 5f, n = 5, l = 3 so, nodes = 2.
Therefore, option b. 5p has four orbital nodes.
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Question 2 (1 point)
A group of friends is cooking an exotic stew in a house in South Florida. One of the
steps of the recipe is that they have to cool off the cooking mixture from 81.70 °C to
49.10 °C. The pot is too big to put it in a fridge for cooling down faster, the cooking
mixture weighted 34.6 kg. Fortunately, one of the friends remembered
thermochemistry and suggested that they put the pot in the small pool that is at the
house to cool it off faster. The pool was not heated and its temperature before
putting the pot with the stew was 19.24 °C. Given that the mass of water in the pool
was 4,825.6 kg, and the specific heat capacity of the pool is 4.30 J/(g°C) and that of
the cooking mixture is 4.20 J/(g°C), what is the final temperature of the pool after
the cooking mixture cooled down to the temperature needed by the recipe?
Your Answer:
Answer
units
Knowing that the system will attin a state of thermal equilibrium, the final temperature of the system is 19.24°C.
What is Thermochemistry?The term thermochemistry has to do with the heat evolved or absorbed in a chemical reaction.
Now we know that the heat gained by the pool is equal to the heat lost by the stew. Hence;
34.6 * 4.20 * ( 81.70 - T) = 4,825.6 * 4.30 * (T - 19.24)
11873 - 145.3T = 2075008T - 39923153.92
11873 + 39923153.9 = 2075008T + 145.3T
39935026.92 = 2075153.3T
T = 39935026.92/2075153.3
T = 19.24°C
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Most of the food that organisms eat can be traced back to? .
A. plants
B. soil
C. animals
D. bacteria
Answer:
A. Plants
Explanation:
Plants are producers, which make their own food. Other organisms, such as rodents, birds, and wild cats, are consumers, which receive their energy from plants or other consumers.
If you did not neutralize the saturated citric acid before you poured it down the drain, describe the potential consequences to the plumbing and the environment.
The plumbing will be corroded and could lower the pH of natural water bodies
What is acidic waste water?The term acidic waste water means water that has a low pH due to the presence of an acidic substance inside the waste water. As we know, citric acid has a low pH.
If this acid is disposed without proper neutralization, the plumbing will be corroded due to the fact that the acid will react with the plumbing material.
Also, this acidc waste could lower the pH of natural water bodies when it gets into natural water bodies.
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If the mercury in a barometer raises 21.7 centimeters due to a change in ambient pressure, what is the corresponding change in pressure in atm?
The corresponding change in pressure in atm is 0.285 atm.
To solve the question, we need to know what pressure is.
What is pressure?This is the force per unit area acting on a surface.
Change in pressure in the mercury barometer.The change in pressure in the mercury barometer is given by ΔP = ρgh where
ρ = density of mercury = 13600 kg/m³, g = acceleration due to gravity = 9.8 m/s² and h = height of mercury = 21.7 cm = 0.217 mSo, ΔP = ρgh
= 13600 kg/m³ × 9.8 m/s² × 0.217 m
= 28921.76 kg/m-s²
= 28921.76 N/m²
= 28921.76 Pa
The change in pressure in atm
Since 1 atm = 101325 Pa
28921.76 Pa = 28921.76 Pa × 1 atm/101325 Pa
= 0.285 atm
So, the corresponding change in pressure in atm is 0.285 atm.
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When 8.45 g of propane burns at STP, what volume of carbon dioxide is produced?
C3H8+ 5O2 > 4H2O+ 3CO2
The answer is 12.9L (I NEED THE STEPS)
The volume of carbon dioxide produced if 8.45 g of propane is burned would be 12.9 L
Stoichiometric calculationFrom the equation of the burning:
[tex]C_3H_8+ 5O_2 -- > 4H_2O+ 3CO_2[/tex]
The mole ratio of propane burned to carbon dioxide produced is 1:3.
Mole of 8.45 g propane = 8.45/44.1 = 0.19 moles
Equivalent mole of carbon dioxide produced = 0.19 x 3 = 0.57 moles
1 mole of any gas at STP = 22.4 L
0.57 moles of carbon dioxide at STP = 22.4 x 0.57 = 12.9 L
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Which of the following conditions would lead to a small population size? a. a low birth to death ratio b. a high birth to death ratio c. immigration d. large number of resources Please select the best answer from the choices provided A B C D Mark this and return
Answer:
Choice A.
A low birth to death ratio
Explanation:
A low birth to death ratio means that people are dying faster than they are being born. This leads to a decreasing population size.
Answer:
It's A
Explanation:
i’ll give brainliest to whoever can give me these answers or at least the intra and intermolecular bonds answers
#1
Intermolecular bonds:-
One Single bond#Carbon monoxide
Formula:-
COMolecular geometry
LinearDrawing
C=OBonds=3
#Silicon tetrafluoride
Formula
SiF_4geometry
TetrahedralBonds=4
#Titanium (4) Sulfide
TiS_2Geometry
LinearBonds=2