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
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.
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.
can someone please explain core and valence electrons in periods for me please
Answer:
The electrons of an atom are typically divided into two categories: valence and core electrons. Valence electrons occupy the outermost shell or highest energy level of an atom while core electrons are those occupying the innermost shell or lowest energy levels
Explanation:
i hope u get it :))
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).
los metales se oxidan
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.
-. You have 100 grams of methane. How many moles do you have?
Answer:
6.25mol
Explanation:
Using the following formula;
Mole = mass ÷ molar mass
According to this question, there are 100 grams of methane (CH4)
Molar Mass of methane (CH4) = 12 + 1(4)
= 12 + 4
= 16g/mol
mole = 100/16
mole = 6.25moles
Therefore, there are 6.25moles of methane in 100g
ionic bonds show which characteristics that arent seen in covalent bonds
What characterizes an Arrhenius acid-base reaction?
O A. It forms a conjugate pair.
O B. It forms a salt and water.
O C. It forms hydrogen gas.
OD. It forms a buffer in water.
An Arrhenius acid-base reaction forms a salt and water.
Arrhenius acid base reaction forms a salt and water.
Hence, option (B) is correct answer.
What is Arrhenius acid-base reaction ?Arrhenius acid-base reaction is Arrhenius acid + Arrhenius Base means water + salt. When Arrhenius acid reacts with Arrhenius base it produce water and salt as product. This is known as neutralization reaction.
Thus, from the above conclusion we can say that Arrhenius acid base reaction forms a salt and water.
Hence, option (B) is correct answer.
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How many atoms of phosphorus are in 7.00 mol of copper(II) phosphate?
Answer: The number of phosphorus atoms in given amount of copper(II) phosphate is [tex]8.431\times 10^{24}[/tex]
Explanation:
We are given:
Moles of copper(II) phosphate [tex]Cu_3(PO_4)_2[/tex] = 7.00 mol
1 mole of copper(II) phosphate contains 3 moles of copper, 2 moles of phosphorus and 8 moles of oxygen atoms
Moles of phosphorus in copper(II) phosphate = [tex](2\times 7.00mol[/tex]
According to the mole concept:
1 mole of a compound contains [tex]6.022\times 10^{23}[/tex] number of particles
So, 7.00 moles of copper(II) phosphate will contain = [tex](2\times 7\times 6.022\times 10^{23}=8.431\times 10^{24}[/tex] number of phosphorus atoms.
Hence, the number of phosphorus atoms in given amount of copper(II) phosphate is [tex]8.431\times 10^{24}[/tex]
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 ;-);-)
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
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.
What are most likely the values of the quantum numbers I and mI for an
electron in a 3p orbital?
A. I = 1, 2, 3; mI = -1/2, + 1/2
B. I = 3; mI = -1/2, + 1/2
C. I = 0, 1, 2, 3; mI = -1, 0, 1
D. I = 1; mI = -1, 0, 1
Answer:
I think its D
Not too sure
The quantum numbers denote the position of an electron in the orbital. The angular momentum quantum number (l) and magnetic quantum number (ml) of the 3p orbital is I = 1; mI = -1, 0, 1. Thus, option D is correct.
What are quantum numbers?The quantum numbers are conserved quantities used to describe the energy and the position of the electron in the atomic orbital. The azimuthal, principal, magnetic, and spin are the four quantum numbers.
The angular momentum quantum number (l) represents the orbital shape and depends on the principal quantum number, n. The magnetic quantum number (ml) represents the orientation.
If an electron is in a 3p orbital then,
n = 3
l = 1
ml = -1, 0, 1
Therefore, option D. 3p orbital contains I = 1; mI = -1, 0, 1.
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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
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]
Please select the word from the list that best fits the definition
Flow of blood from the heart to the body tissues and back to the heart
Artery
Vein
Capillary
Systemic Circulation
Pulmonary Circulation
Answer:
Systemic Circulation
Explanation:
Answer:
Systemic Circuit
Systemic circulation carries oxygenated blood from the left ventricle, through the arteries, to the capillaries in the tissues of the body. From the tissue capillaries, the deoxygenated blood returns through a system of veins to the right atrium of the heart.Explanation:
I hope it's helpful for you ☺️Need organic chemistry 11th grade
for practice and 1 question is enough :)
Answer:
ok all you need is a little study
Explanation:
organic chemistry isn't something to worry about is something that is a very simple concept if you understand what you're doing so a little bit of studying will help you go through it and you really don't this is not the topics that you will really understand if you just go through it as once so there is no need to worry about organic chemistry it is very simple concept just learning you are a you are close just learn all those simple aspects alkane etc it's very easy
Which statement is true for most autotrophic organisms?
A. They carry on extracellular digestion of nutrients before they ingest them.
B. They synthesize organic molecules from inorganic molecules.
C. They obtain organic molecules from heterotrophic organisms.
O O
D. They require no external energy source.
omg yees
eExplanation:
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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equivalent massof sodium
Answer:
Sodium
Formula : Na
Equivalent mass:23.0
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Which of the following would DECREASE the rate of a reaction?
1. add a catalyst
2. increase the concentration
3. increase the volume
4. increase the pressure
Answer: increasing volume
Explanation: adding a catalyst would increase reaction time and increasing INCREASING concentration definently makes reaction time alot faster increasing pressure actually makes it more concentrated, so no it is not
Which one is it ?? Hurry please!!
Answer:
3-Ethyl-2,4-Dimethylhexane
Explanation:
3-ethyl-2,4-dimethylhexane
Which of the following equations is balanced?
(options in photo)
Answer:
Option (B)
Explanation:
Na2SO4 (aq) + CaCl2 (aq) → CaSO4 (s) + 2 NaCl (aq)
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.
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.
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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