Answer:
0.0036 moles of NaOH are present
Explanation:
A solution of 0.1mol/dm³ contains 0.1 moles of solute (In this case, NaOH), per 1 dm³ of solution.
36cm³ are in dm³ (1000cm³ / 1dm³):
36cm³ * (1dm³/1000cm³) = 0.036dm³
The moles are:
0.036dm³ * (0.1mol/dm³) = 0.0036 moles of NaOH are present
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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If one of the reactants in a reaction us Na2O, what is known about the products?
Ok here's the deal
the answer is A: The products will contain exactly 2 Na atoms and 1 O atom.
Explanation:
thank me later space-ex kids
The ksp of StS04 is 3.2x10-7 What is the equilibrium concentration of sulfate lon a 1.0-L solution of strontium sulfate to which 0.10 mol of Sr(CH3CO2)2 has been added?
Answer:ehwusvudhwdvwxkwvbxbwxbxiwhxjvwxjvxwjxvjxvwxiwvxiwzgiwxvwjsbwis
HOPE IT HELPS IF YOU LIKE MY ANSWER THEN MARK ME AS BRAINLIEST ;-);-)
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
Nitrogen in plants and soil is changed into nitrogen compounds by _____ ?
Nitrogen Fixation because It's the process by which atmospheric nitrogen is converted either by a natural or an industrial means to form of nitrogen such as ammonia.
the electrolyte does not need heating to keep it in its molten state; why?
Answer:
Because an electrolyte already has mobile molecules.
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.
Nat+ is which of the following
1. a solution
2. a mixture
3. an ion
4. a compound
Answer:
3.
[tex]{ \tt{Na {}^{ + } }} \: is \: an \: ion[/tex]
equivalent massof sodium
Answer:
Sodium
Formula : Na
Equivalent mass:23.0
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⬆️= 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:
10. A laboratory experiment requires that
exactly 3 mL of chemical be dispensed into a
test tube. Which piece of equipment would be
MOST appropriate for measuring and
dispensing the chemical?
A another test tube
B a pipette
C a beaker
D a scale balance
Answer:
B) a pipette
Explanation:
Also known as a graduated pipette, they vary in volume, with most measuring between 0 and 25.0 mL. A small pipette can be used for precise measurement of fluids.
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.
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
What does a low number on the pH scale say about a solution?
A. The solution is neutral.
B. The solution is a base.
C. The solution is changing.
D. The solution is an acid.
Answer:
d. the solution is a acid
Answer:D The solution is an acid
Explanation:The lower the pH of a substance the stronger the acidic level.
pls answer the following question for me
1. and C.
Terrycot is a fiber that is made by mixing two fibers. Terrycot is a blended fabric made of terylene and cotton. It has better absorbing power as compared to Terylene. Nylon and terylene are produced through condensation polymeriztation.
Hope it helps...
Answer:
Explanation:
1-B
2-A
3-D
4-C
How is the AHfusion used to calculate the energy required to vaporize a
volume of liquid?
O A. Liters liquid x 1000ml/1L x ml/g x g/mol x AHfusion
O B. Liters liquid x 1000ml/1L x g/ml x mol/g < 1/A Hfusion
C. Liters liquid 1000ml/1L x ml/g x g/mol < 1/AHfusion
O D. Liters liquid x 1000ml/1L x g/ml x mol/g < AHfusion
Your Question is complete but the options are very much confusing and contradicting. Below you will find the true and full content.
The correct answer for the given question about Enthalpy of vaporisation is ( Volume of liquid in L x 1000 g/L x ΔHvap cal/gm ) where ΔHvap = 540 cal/gm (in case of water).
What is Enthalpy of vaporisation ?The amount of energy (enthalpy) required to convert a portion of a liquid into a gas is known as the enthalpy of vaporisation, abbreviated as ΔHvap and also referred to as the latent heat of vaporisation or heat of evaporation.
How to solve this question?
Let E be the energy required to calculate the energy required to vaporise a volume of liquid.
Then,
E = Volume of liquid in L x Density of liquid in gm/L x ΔHvap in cal/gm
and E will came out in calorie.
E = Volume of liquid in L x 1000 g/L x 540 cal/gm --- (in case of water)
Thus we can conclude that to calculate the energy required to vaporise a volume of liquid, we can use the formula with ΔHvap which is E = (Volume of liquid in L x Density of liquid g/L x ΔHvap cal/gm ) and the answer will be in calorie.
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specific rights related to freedom of expression
Answer:
beliefs, thoughts, ideas, and emotions
Explanation:
freedom of expression guarantees the freedom to express oneself without government censorship or media censorship.
H2O có tác dụng được với O2 không?
Answer:
A water molecule (formally known as dihydrogen monoxide) is composed of two hydrogen atoms and one oxygen atom. ... In English, the equation says: To produce two molecules of water (H2O), two molecules of diatomic hydrogen (H2) must be combined with one molecule of diatomic oxygen (O2).
Which one is it ?? Hurry please!!
Answer:
3-Ethyl-2,4-Dimethylhexane
Explanation:
3-ethyl-2,4-dimethylhexane
While playing soccer, Caria slides across one of the lines on the field. When she stands up, what base does she stop?
O calcium hydroxide
O ammonium hydroxide
O zinc hydroxide
potassium hydroxide
l
Answer:
Canxi hydroxit
Explanation:
Answer:
A- calcium hydroxide
Explanation:
Got it right on Edge.
In animal skin tissue, cell division is responsible for
A. Growth and repair
B. Sexual reproduction
C. Obtaining energy
D. production of sex cells
Answer: Its A Your Welcome
In animal skin tissue, cell division is responsible for growth and repair. The correct answer is option A.
Cell division is the process by which a single cell divides into two or more daughter cells. This process is essential for growth, repair, and reproduction in living organisms.
Cell division in animal skin tissue is responsible for growth and repair. When the skin is damaged, cells divide to repair the damaged area.
There are two main types of cell division:
Mitosis is the process of cell division that produces two identical daughter cells.Meiosis is the process of cell division that produces four genetically diverse daughter cells, used in the production of gametes (sex cells).Additionally, cell division is responsible for the growth of skin tissue during development and throughout the life of the organism.
Therefore, the correct answer is option A. Growth and repair.
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2. Which equation does not represent a neutralisation reaction?
HELP PLEASE
Answer:
Zn + 2HCl => ZnCl2 + H2
Explanation:
This equation represents salt formation or salt preparation. Thus not a neutralization reaction.
A mixture of 0.5940 M CO and 0.3950 M Cl2 is enclosed in a vessel and heated to 1000 K . CO(g)+Cl2(g)↽−−⇀COCl2(g)c=255.0 at 1000 K Calculate the equilibrium concentration of each gas at 1000 K
Answer:
[CO] = 0.2064M
[Cl2] = 0.0074M
[COCl2] = 0.3876M
Explanation:
Based on the reaction, Kc at 1000K is:
Kc = 255.0 = [COCl2] / [CO] [Cl2]
Where [] are concentrations at equilibrium
As the reaction is 1:1, the concentrations at equilibrium are:
[CO] = 0.5940M - X
[Cl2] = 0.3950M - X
[COCl2] = X
Where X is reaction coordinate
Replacing:
255.0 = [X] / [0.5940 - X] [0.3950 - X]
255.0 = X / 0.23463 - 0.989 X + X²
59.8307 - 252.195 X + 255 X² = X
59.8307 - 253.195 X + 255 X² = 0
Solving for X:
X = 0.605M. False solution because produce negative answers
X = 0.3876M. Right solution.
Replacing:
[CO] = 0.5940M - 0.3876M
[Cl2] = 0.3950M - 0.3876M
[COCl2] = 0.3876M
[CO] = 0.2064M
[Cl2] = 0.0074M
[COCl2] = 0.3876M
The concentration at equilibrium of CO is 0.2064 M, [tex]\rm Cl_2[/tex] is 0.0074 M, and [tex]\rm COCl_2[/tex] is 0.3876 M.
The initial concentration of CO = 0.5940 M
[tex]\rm Cl_2[/tex] = 0.3950 M
At equilibrium,
Let the concentration of formed [tex]\rm COCl_2[/tex] = x
Concentration of CO = 0.5940 - x M
Concentration of [tex]\rm Cl_2[/tex] = 0.3950 - x M
[tex]\rm K_c[/tex] = 255
[tex]\rm K_c[/tex] = [tex]\rm \dfrac{[COCl_2]}{[CO]\;[Cl_2]}[/tex]
255 = [tex]\rm \dfrac{x}{[0.5940-x]\;[0.3950-x]}[/tex]
(151.47 - 255x) (100.727-255x) = x
15,256 - 65,025 [tex]\rm x^2[/tex] = x
0 = 65,025 [tex]\rm x^2[/tex] +x - 15,256
x = [tex]\rm\dfrac{-b\;\pm\;\sqrt{b^2\;-\;4ac} }{2a}[/tex]
a = 65,025
b = 1
c = -15,256
x = 0.38 M
Thus, the concentration at equilibrium of CO is 0.2064 M, [tex]\rm Cl_2[/tex] is 0.0074 M, and [tex]\rm COCl_2[/tex] is 0.3876 M.
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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.
CHEMISTRY HW... DUE in 2.5 hours! HELP!!!!
Answer:
The final temperature aluminium-water system is 24° C
Explanation:
Heat energy, H = mcθ
Where m is mass of substance, c is specific heat capacity, θ is temperature difference
Using the principle, Heat lost = Heat gained
Let the final temperature of the aluminium-water system be Tfinal
Heat lost by aluminium, H₁ = -m₁c₁(Tfinal - 40)
Heat gained by water, H₂ = m₂c₂(Tfinal -21)
Heat lost by aluminium, H = -[30 × 0.21 × (Tfinal - 40)]
H₁ = -6.3Tfinal + 252
Heat gained by water, H₂ = 50 × 1.0 × (Tfinal - 21)
H₂ = 5Tfinal - 21
Equating H₁ and H₂
-6.3Tfinal + 252 = 5 Tfinal - 21
5Tfinal + 6.3Ffinal = 252 + 21
11.3 Tfinal = 273
Tfinal = 273/11.3
Tfinal = 24° C
Therefore, the final temperature aluminium-water system is 24° C
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:
Please answer. Brainliest!
Answer:
the equation is unbalanced
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.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
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.