Answer:
B
Explanation:
When the electron goes up levels it absorbs energy to enter that higher energy state. When it goes down, it releases energy but just not as much because 1-4 is more than 4-2.
Which of the following would be expected to have the lowest boiling point?
CH3CH2CH2CH3, CH3CH2NHCH3, NH2CH2CH2NH2, CH3CH2CH2NH2
O CH3CH2NHCH3
O NH2CH2CH2NH2
O CH3CH2CH2NH2
O CH3CH2CH2CH3
Answer:
CH3CH2CH2CH3
Explanation:
The boiling point of a compound depends on the nature of intermolecular interaction between the molecules of the compound.
If a molecule is nonpolar and has a low molecular mass, then its molecules are most likely held together only by weak intermolecular bonds such as dispersion forces. These forces are easily broken and the molecules move apart hence the molecule possess a low boiling point.
Polar molecules and molecules having higher molecular mass tend to have higher boiling points.
Among all the compounds listed, CH3CH2CH2CH3 is non polar and has the lowest molecular mass hence it exhibits the least boiling point.
how much energy (in joules) is needed to change 45.0 grams of ice at -25.0 C to water at 49 C?
Explanation:
The heat required to convert 25 grams of -10 °C steam is 78360 J or 78.36 kJ.
What is the phase of water at 1.0 atm and 50°C?
A. Liquid and gas
B. Solid
C. Liquid
D. Gas
heyoo I need help pleaseeeeee
c) Current cannot flow
Reason: Because the switch is not closed.
Answer:
current can't flow
Explanation:
by the way of explanation it is open circuit in which the current flow whereas in closed circuit the current flow.
if you like my answer please mark as brainlist.
it will be too much help for me.
Please answer. Brainliest!
Answer:
the equation is unbalanced
Please answer ASAP!!
Cu+2 + 2e- ———> Cu E*= 0.52 V
Ag+1 + 1e- ———> Ag E*= 0.80 V
Using the two cell reduction potential shown for the corresponding reaction calculate the cell potential for a voltaic cell made from these two metals.
A. 1.32 V
B. -0.28 V
C.0.28 V
D. -1.32 V
Answer:
C.0.28 V
Explanation:
Using the standard cell potential we can find the standard cell potential for a voltaic cell as follows:
The most positive potential is the potential that will be more easily reduced. The other reaction will be the oxidized one. That means for the reactions:
Cu²⁺ + 2e⁻ → Cu E° = 0.52V
Ag⁺ + 1e⁻ → Ag E° = 0.80V
As the Cu will be oxidized:
Cu → Cu²⁺ + 2e⁻
The cell potential is:
E°Cell = E°cathode(reduced) - E°cathode(oxidized)
E°cell = 0.80V - (0.52V)
E°cell = 1.32V
Right answer is:
C.0.28 V
Jason combines the two intermediate steps shown. 2 equations. First: upper N subscript 2 (g) plus upper O subscript 2 (g) right arrow 2 upper N upper O (g). Second: 2 upper N upper O (g) plus upper O subscript 2 (g) right arrow 2 upper N upper O subscript 2 (g). Which best describes what Jason should do with the oxygen molecules?
Answer:
The molecules of oxygen should be placed as reactants in the equation.
Explanation:
1: N₂ + O₂ → 2NO
2: 2NO + O₂ → 2NO₂
complete reaction:
N₂ + 2O₂ → 2NO₂
In both intermediate equations' oxygen is used as reactant because the end product is the product of the combination of nitrogen and oxygen. So in the complete or overall reaction, oxygen should also be placed as reactant.We can not place oxygen at the side of products neither we can cancel it because, products can only be obtained at the end of the reaction but according to the equations' oxygen is not the end product of the reaction. But the addition into the reaction (Eq. 2) to make the new product.
Also, we can not cancel it because to cancel out molecules of oxygen should be present at the both sides with same amount in the stoichiometric equation.
Hence, in a balanced chemical equation, oxygen should be written as a reactant by using the correct number of moles.
A gas volume of 800.0 litres at _23.00 Celsius and 300.0 torr what would the volume of the gas be at 227.0 Celsius and 600.0 torr of pressure
Answer:
676 L
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 800 L
Initial temperature (T₁) = 23 °C = 23 + 273 = 296 K
Initial pressure (P₁) = 300 torr
Final temperature (T₂) = 227 °C = 227 + 273 = 500 K
Final pressure (P₂) = 600 torr
Final volume (V₂) =?
The final volume of the gas can be obtained as follow:
P₁V₁/T₁ = P₂V₂/T₂
300 × 800 / 296 = 600 × V₂ / 500
240000 / 296 = 600 × V₂ / 500
Cross multiply
296 × 600 × V₂ = 240000 × 500
177600 × V₂ = 12000000
Divide both side by 177600
V₂ = 12000000 / 177600
V₂ = 675.68 L
V₂ ≈ 676 L
Thus, the final volume of gas is 676 L
How many places after the decimal should your measurements contain?
Answer:
Minimum 2. ( Thats how I do, and till now there is no probs)
Thank You'
Hope it helps u
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Open Ended
21. What does it mean to say that "atoms are not created or destroyed" in a chemical reaction?
22. In a chemical reactičn, is it possible to change the amount of products by changing the
amount of reactants? Why?
23. Can atoms that are not in the reactants end up in the products of a chemical reaction? Why?
24. How would you prove that a chemical equation is balanced?
Answer:
Explanation:
21. Atoms are not created or destroyed means that atoms that you begin with are the atoms that you will end with. The catch is that the atoms will rearrange to give you new compounds, but the atoms that you initially had are the atoms you will still have after reaction. For eg, if you started with eggs and made omelet. Omelet is a "new" compound, but the atoms that were in the eggs have rearranged to become the omelet so can you see that atoms were not created or destroyed to make the omelet.
22. Yes because amount of products you make depends on how much reactants you have. For eg, I need two graham cracker(GC), one marshmallow(M), and one chocolate (C) to make a s'more. If I get more of each item then I can make more s'mores and consequently having minimum amounts results in less s'mores that I make.
23. Not possible, due to law of conservation of matter and energy. Atoms cannot be created nor be destroyed, they are simply rearranged. For eg, Taking A + B cannot give you a new compound with a chemical formula D or XZ. A + B can however give you AB which is rearrangement of the starting atoms.
24. Chemical equation is balanced when atoms on reactant side and atoms of product side are in equal counts. I have attached a graphic below for more help.
How many electron containing orbitals are in an atom of tin ?
Answer:
10
Explanation:
how many electron-containing d orbitals are there in an atom of tin? name the element in the 4th period whose atoms have the same number of highest-energy-level elctrons as tin
10, germanium
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the total number of orbitals containing electrons in an atom of tin are 10 orbitals.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
The electronic configuration of tin is 1s² 2s² 2p⁶ 3s²3p⁶ 4s² 3d¹⁰ 4p⁶ 5s²4d¹⁰ 5p² or [Kr] 5s² 4d¹⁰ 5p². The total number of orbitals containing electrons in an atom of tin are 10 orbitals. tin an element that belongs to p block of periodic table.
Therefore, the total number of orbitals containing electrons in an atom of tin are 10 orbitals.
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1/10
Mixtures in which one ingredient dissolves in
another to form an uniform systerp are known
as suspensions.
Truth or false?
Answer:
True.
Explanation:
Suspensions are formed when a mixture is not fully dissolved in another mixture, and happens when solid particles can be seen floating on the surface of the mixture of the mixtures.
can someone pls tell me if this is correct? and also if possible, pls explain the difference between fractional and simple distillation, thank you sm <3
Explanation:
everything can be found in the picture
One mole of Beryllium weighs 9.0122 grams. How many atoms of Beryllium are
there?
4
9.0122
6.022 x 10^23
18
Answer:
4
Explanation:
cause 1 mole of beryllium weighs 4gram
The hydrogen emission spectrum is shown below. What is the energy of the
486 nm emission line? (The speed of light in a vacuum is 3.00 x 10^8 m/s, and Planck's constant is 6.626 x 10^-34 Jos.)
A. 2.44 x 10^18 J
B. 7.33 x 10^26 J
C. 6.17 x 10^14 J
D. 4.09 x 10^-19 J
Answer:
D
Explanation:
answer is in photo above
can anyone tell me how i can balance this equation: Al203 = Al (l) + O2(g)
into this balanced equation: 2Al203(l) =4Al(l)+ 3O2(g)
Answer:
Explanation:
please see the picture
Plzzzz someone Help fasttt
Answer:
1,181 g
Explanation:
143.091 × 8.250 = 1,180.5 round up to 1,181
⬆️= you need to come up with investigation question, to help inform your decision.
Think about how land, water, and air absorb and release
Thermal energy and then formulate your hypothesis
I need some Investigation questions about how land, water, and air absorb and release
Thermal energy :,)
Subject: science
Answer:
1. how dense is the land and what matreal
2. what is the humidity and is there any wind
3.how pure is the water if it full of minarils
Explanation:
why is polyester hard to decompose
Polyester is not biodegradable
Equation balancing a. S(s) + O2(g) → SO3(8) b. 2Al(s) + 3C12(8) ► 2AICI,(s) E. 2NaOH(s) + H2SO,(ac) —Na,SO (ac) + H2O(1) d. CHg(8) + 50(8) - A 3C02(8) + 4H2O(g)
Answer:
a. S(s) + 3/2 O₂(g) → SO₃(g)
b. Al(s) + 3/2 Cl₂(g) → AICI₃(s)
c. 2 NaOH(s) + H₂SO₄(ac) → Na₂SO₄(ac) + 2 H₂O(l)
d. C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(g)
Explanation:
We will balance the equation using the trial and error method.
a. S(s) + O₂(g) → SO₃(g)
1. We will balance O atoms by multiplying O₂by 3/2.
S(s) + 3/2 O₂(g) → SO₃(g)
b. Al(s) + Cl₂(g) → AICI₃(s)
1. We will balance Cl atoms by multiplying Cl₂ by 3/2.
Al(s) + 3/2 Cl₂(g) → AICI₃(s)
c. NaOH(s) + H₂SO₄(ac) → Na₂SO₄(ac) + H₂O(l)
1. We will balance Na atoms by multiplying NaOH by 2.
2. We will balance H and O atoms by multiplying H₂O by 2.
2 NaOH(s) + H₂SO₄(ac) → Na₂SO₄(ac) + 2 H₂O(l)
d. C₃H₈(g) + O₂(g) → CO₂(g) + H₂O(g)
1. We will balance C atoms by multiplying CO₂ by 3.
2. We will balance H atoms by multiplying H₂O by 4.
3. We will balance O atoms by multiplying O₂ by 5.
C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(g)
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What happens in nuclear fission?
A. Electrons fall to lower energy levels, emitting photons.
B. Two separate nuclei join together to form one nucleus.
C. A nucleus gains neutrons by emitting an alpha particle.
D. A nucleus is divided into more than one nucleus.
Answer: D
Explanation:
I just did it
Give the IUPAC name of the following compound
Answer:
3-phenylprop-2-enal
Explanation:
The given compound consists of a phenyl group, which is the ring
Considering the longest chain starting from the carbon atom closest to the aldehyde, CHO, functional group, the location of the phenyl group is at the 3rd carbon atom on the longest chain
C6H5-C₃H = C₂H - C₁HO
Therefore, for the name of the branched group, we have;
3-phenyl
Based on the location of the double bond, at the second carbon atom, we have;
The name of the straight chin = Prop-2-ene
The name of the aldehyde functional group, CHO, is then added at the end by indicating its position on the longest chain, which is on the first carbon, the IUPAC name of the aldehyde functional group is -al, to give;
1-al
Combining, we get
3-phenylprop-2-ene-1-al
We remove the 1, to get the IUPAC name of the compound as follows;
3-phenylprop-2-enal
A se ion has a mass number of 77
and a charge of −2
. Determine the number of neutrons, protons, and electrons in this ion.
Answer:
1. Neutron number = 43
2. Proton number = 34
3. Electron number = 36
Explanation:
From the question given above, the following data were obtained:
Mass number = 77
Charge of ion = –2
1. Determination of the number of neutron.
Mass number of Se = 77
Atomic number = 34
Neutron number =?
NOTE: Atomic number = proton number
Mass number = Proton + Neutron
77 = 34 + Neutron
Collect like terms
77 – 34 = Neutron
Neutron number = 43
2. Determination of the proton number.
The atomic number of an element is simply defined as the number of protons in the atom of the element. Mathematically,
Atomic number = Proton number
Atomic number of Se = 34
Therefore, the proton number of Se²¯ is 34.
NOTE: The atomic number does not change be it atom, ion or molecule. It remains the same.
3. Determination of electron number.
Charge of ion = –2
Proton number = 34
Electron number =?
Proton – Electron = Charge
34 – Electron = –2
Rearrange
34 + 2 = Electron
36 = Electron
Electron number = 36
There are 43 neutrons, 34 protons, and 36 electrons in the given selenium ion with a (-2) charge.
Explanation:
Given:
A selenium ion with a mass number of 77 and a charge of (-2).
To find:
The number of neutrons, protons, and electrons in selenium ion
Solution:
Charge on the selenium ion = -2
The atomic number of selenium = 34
Number of protons = Atomic number
Number of protons in selenium atom = 34
Number of protons in selenium ion = 34
Number of electrons in selenium atom = 34
Number of electrons in selenium ion= 34+2 = 36
(anion is formed by gaining of electrons that is why adding two electrons )
The mass number of selenium = 77
Mass number = Number of protons + Number of neutrons
77 = 34 + Number of neutrons in selenium
Number of neutrons in selenium ion = 77 - 34 = 43
There are 43 neutrons, 34 protons, and 36 electrons in the given selenium ion with a (-2) charge.
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PLEASE HELP! Will give BRAINLIEST——List two possible steps where copper yield may be lost (why you may not get all the copper back at the end). Be specific about the steps and how they might lose the copper.
Answer:
Throughout the below section of explanation, the two possible steps are provided.
Explanation:
The CuO produced by that of the Cu(OH)2 heat treatment might cause reduced copper output, It's because of the technique of decanting. Following this Cu(OH)2, this would be translated into filtered parchment which causes certain contaminants to be added in the specimen and therefore doesn't decant throughout warming.When H2SO4 would be added to that same CuO that has been produced throughout the ending phase, CuSO4 has been accumulated that is transmitted as a way to solve something else that might reduce or lose copper content.the electrolyte does not need heating to keep it in its molten state; why?
Answer:
Because an electrolyte already has mobile molecules.
The image shows two siblings with their grandparents.
Which best explains why the siblings look more like each other and less like their grandparents?
The siblings are more closely related to each other than they are to their grandparents.
Each sibling is more closely related to the grandparents than to the other sibling.
The grandparents do not have any shared characteristics in common with the siblings.
The grandparents do not have any shared characteristics with one another.
Answer:
the siblings are more closely related to eachother than they are to their grandparents
Answer:
a
Explanation:
The formation of a gaseous product is usually indicated by a/an______________ in a chemical reaction.
Answer: The formation of a gaseous product is indicated by an UPWARD ARROW in a chemical reaction.
Explanation:
A chemical reaction is defined as the process whereby chemical bonds between atoms of
substances known as reactants are either formed or broken leading to the formation of products. New substances are usually formed during a chemical reaction. The following are features of chemical reaction:
--> Evolution of gas
--> Formation of a precipitate
--> Change in color
--> Change in temperature
--> Change in state and
--> Formation of new substances.
Some chemical reactions takes place with the evolution of gas. This can be seen in the reaction of Zinc metal with hydrochloric acid. Hydrogen gas is EVOLVED with the formation of zinc chloride.
UPWARD ARROW in a chemical reaction indicates the evolution of a gas. It appears only on the product side and is written next to the gaseous product.
Se puede inferir que el órgano de los sentidos que contiene un mayor número de terminaciones nerviosas debido a su extensión es *
Answer:
La piel.
Explanation:
La piel es el órgano que forma el límite del cuerpo con el mundo exterior. La piel sirve para varios propósitos. Protege al cuerpo de influencias externas como el calor, el frío, la radiación o las bacterias y ayuda a mantener un ambiente interno estable. La piel está fuertemente atada a los huesos y tejidos. Por lo general, la piel alberga más de 100 especies bacterianas diferentes y algunas investigaciones sugieren que la mayoría de estas bacterias son beneficiosas y aumentan la probabilidad de que se evite la infestación de parásitos.
While molecules such as glucose move freely in the blood, triglycerides are carried in the blood by very low density lipoproteins (VLDLs) in the form of chylomicrons. A chylomicron resembles a droplet, with phospholipid heads and VLDLs facing water, the solvent of blood, while triglycerides are found within. The outer surface resembles that of a regular phospholipid bilayer. If the contents of a chylomicron are all lipids
A. then they should be soluble in blood plasma.
B. an inner layer is needed because phospholipids always form bilayers,
C. there is no need for an inner phospholipid layer in a chylomicron
Answer:
B. an inner layer is needed because phospholipids always form bilayers.
Explanation:
Lipids are organic compounds which are not soluble in water but they are soluble in organic compounds. They are formed in body by combination of various molecules. The inner layer of phospholipids always form bilayers.