Explanation:
I
have not yet learnt chemistry so sorry
Answer:
350
Explanation:
What would you expect to be the electron-group arrangement around atom A in the following case? Give the ideal bond angles and the direction of any expected deviation.
Answer:
The answer is "Tetrahedral".
Explanation:
The carbon atom of approximately [tex]109.5^{\circ}[/tex] with four attachments. Its general form is one of a tetrahedron: a polyhedron consisting of 4 triangular sides, six straight edges, and four vertex corners from all faces equilateral triangles. The triangular pyramid is often referred to as the triangular pyramid.
What’s a chemical property
Answer:
A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity. ... They can also be useful to identify an unknown substance or to separate or purify it from other substances.
help ! thank u / ill give brainlist !
Give two examples of energy transformations that occur throughout the journey to or on the planet.
Answer:
Our bodies convert chemical energy in our food into mechanical energy for us to move.
An electric fan transforms electrical energy into kinetic energy
Reword it tho
Hope this helps!!
True or false: A skeleton equation in chemistry shows the relative amounts of all materials in the reaction
Answer:
false im pretty sure.
Which best explains the relationship between evaporation and temperature?
• A liquid evaporates slower at lower temperatures because the molecules are more spread apart and are not pushed
as easily from the liquid's surface.
O A liquid evaporates faster at lower temperatures becaus the attractions are decreased and more particles can
escape the surface of the liquid.
© A liquid evaporates slower at higher temperatures because the vapor pressure of the liquid is higher, SO fewer
molecules can escape the surface.
• A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome
attractions in the liquid.
Answer: D
Explanation:
liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Answer:
D. A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
Climate change as we know it today is
characterized by a(n) __change in the
earth's temperature.
slow
abrupt (sudden)
rough
How many moles are in 482 mL of a 1.91 M solution of NaBr?
Answer:
0.921 moles
Explanation:
1.91 M means 1.91 moles/liter
482 mL = 0.482 L
0.482 L × 1.91 moles/liter = 0.92062 moles
How is the molar mass of a molecule determined? What are its units?
Answer:
Explanation:
molar mass=valency of the element*atomic number
its unit is amu
why does a plant have a cell wall and a cell membrane?
ASAP Pls have to turn it in at 11:00pm
Answer:
The cell wall surrounds the plasma membrane and provides the cell tensile strength and protection. ... The cell wall surrounds the plasma membrane of plant cells and provides tensile strength and protection against mechanical and osmotic stress.
hope It Helps U
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Fassst. A or b or c or d plzzz
Answer:
C
Explanation:
Kepler first law means that planets mover around the sun in a elliptical motion
The boiling point of Kelvin scale is:
a) 237º K
b) 100°C
c) 100°K
d) 373°
Answer:
The boiling point of Kelvin scale is: 373° k
hope it is helpful to you
D D 8. (06.02 LC)
A heating curve has two flat lines, or plateaus. What does the plateau at the lower temperature represent? (5 poin
A. Boiling of a liquid
B. Melting of a solid
C. Increase in temperature of a substance
D. Decrease in temperature of a substance
Answer:
Boiling of a liquid
The plateau at the lower temperature represents option A. Boiling of a liquid.
Representation of the plateau at the lower temperature:At the time when the heating curve should have two flat line or the plateaus so here the lower temperature shows the boiling of the liquid.
As the first plateau shows the melting and the second plateau shows the boiling.
hence, the option a is correct.
Learn more about temperature here: https://brainly.com/question/22262659
2.50 g of CO2 gas is confined in a rigid cylinder at a pressure of 4.65 atm. If 0.42 g of gas is released from the cylinder, what is the new pressure?
Answer:
5.59atm
Explanation:
boyles law
P1V1=P2V2
4.65×2.5=P2×(2.5-0.42)
11.625=P2×2.08
P2=5.59atm
What is the general form for the simplest type of acid-base reaction?
O A. Acid + base > H+ + OH-
B. Acid + base → base + acid
C. Acid + base + salt + water
D. Acid + base → solid + water
Answer:
Your answer is C
Explanation:
When an acid and base react, the acidic hydrogen ion and the basic hydroxide ion in each acid and base neutralize each other and form water. Meanwhile the conjugate base and conjugate acid (the leftover compounds) react to form an ionic molecule, or a salt. (In chemistry, when an anion and a cation form an ionic bond the new molecule is called a salt). Hope this helps!
ou discover that the complex decomposes in water. When 0.1000 g of the complex is dissolved in water with excess NaHg(SCN)4, all of the Co(II) is precipitated as CoHg(SCN)4 (s). After the precipitate is washed and dried, its mass is found to be 0.1102 g. How many grams of cobalt are contained in the original 0.1000 grams of the complex
Answer:
6.28x10⁻³ g
Explanation:
First we convert 0.1102 grams of CoHg(SCN)₄ into moles, using its molar mass:
0.1102 g ÷ 491.9 g/mol = 2.24x10⁻⁴ mol CoHg(SCN)₄There is 1 Co mol per CoHg(SCN)₄ mol, meaning there's also 2.24x10⁻⁴ moles of Co.
We now convert 2.24x10⁻⁴ moles of Co into grams, using its molar mass:
2.24x10⁻⁴ mol Co * 28.01 g/mol = 6.28x10⁻³ gWhat is the thermal efficiency of an engine that takes n moles of diatomic ideal gas through the cycle
Answer:
The thermal efficiency of an engine is [tex]0.15[/tex] that is 15%
Explanation:
Specific heat of a gas at constant volume is
[tex]C_{v}=\frac{fR}{2}[/tex]
here, [tex]f=[/tex]degree of freedom
[tex]R=[/tex]universal gas constant
Thermal efficiency of a cycle is
[tex]\frac{total workdone}{gross heat absorbed}[/tex]
Gross heat absorbed is amount of heat that absorbed.
ω[tex]=P_{o} V_{o}[/tex]
[tex]Q_{AB}=[/tex]Δ[tex]V_{AB}+[/tex]ω[tex]_{AB}[/tex][tex]=nC_{v}(T_{f}-T_{i} )[/tex]
[tex]=n\frac{f}{2}(RT_{f}-RT_{i} )[/tex][tex]=\frac{f}{2}(P_{o}V_{o} )[/tex]
[tex]Q_{BC}=n(\frac{f}{2}+1 )R(T_{f}-T_{i} )[/tex]
[tex]=(\frac{f}{2} +1)(4P_{o}V_{o}-2P_{o}V_{o} )[/tex]=[tex]=(\frac{f}{2}+1)2P_{o}V_{o}[/tex]
[tex]Q_{CD}=-ve and Q_{DA}=-ve[/tex] these 2 are not the part of gross heat
η[tex]=\frac{P_{o}V_{o} }{(\frac{3f}{2}+2 )(P_{o}V_{o})}[/tex]
[tex]=\frac{1}{(\frac{3f}{2}+2 )}[/tex]
For monoatomic gas [tex]f=3[/tex]
η[tex]=\frac{2}{13}[/tex]
[tex]=0.15[/tex]
Calculate the percent composition of Ca3P2
Answer:
Ca - 66%, P - 34%
Explanation:
So, this is the formula we can use to find the amount of each element:
Element count * Atomic mass = Mass
Plug in our elements for this:
Ca - 3*40.078=120.234
P - 2*30.973=61.946
Now, to find the percentage of mass, we must find total mass, and divide the two elements mass count by this total mass:
120.234+61.946=182.18
Now divide each element mass by the total mass:
Ca - 120.234/182.18=0.6599(Round to 0.65)
P - 61.946/182.18=0.34002(Round to 0.34)
Then multiply both numbers by 100 to get the percentage:
Ca - 65%
P - 34%
So these our your two answer!
Hope this helps!
Chemical Reactions:Question 3
The graph shows the energy change that occurs during a chemical reaction.
Graph 1
Energy
Reaction Progress
What conclusion can be reached based upon the graph?
Select one
The energy of the reactants is less than the energy of the products,
The energy of the products and the energy of the reactants are equal.
The energy of the products is less than the energy of the reactants
Energy was neither absorbed not released during this reaction
Answer:
because of how big it is
Explanation:
frgftvtv
The graphs shows the energy change of an exothermic reaction. Hence, the energy of products is less than the energy of reactants. Thus, option c is correct.
What is an exothermic reaction?The reaction in which heat energy is evolved to the surroundings is called an exothermic reaction. The reaction where, the heat energy is absorbed by the system is called endothermic reaction.
An energy diagram is used to describe the energy change in a reaction and the energy difference between reactants and products. In an endothermic reaction, the reactants are absorbing sufficient energy and thus easily overcome the barrier potential.
In exothermic reactions, products are absorbing energy and overcome the barrier potential. Therefore, in exothermic reactions, the potential energy of products is less than that of reactants as shown in the diagram.
Find more on energy diagram:
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PPLLLLLZZZZZ HELPPPPPPPPP ME WITH THIS QUESTION BRAINLIEST PLUS 20 POINTS If CO2 was added to this system what would the outcomes for this reaction be?
CO2 + H2O <-> H2CO3
Question 4 options:
It would shift to the right, favor the forward reaction and the rate of reaction would decrease.
It would shift to the left, favor the forward reaction and the rate of reaction would increase.
It would shift to the right, favor the forward reaction and the rate of reaction would increase.
It would shift to the left, favor the reverse reaction and the rate of reaction would decrease.
It would shift to the right, favor the forward reaction and the rate of reaction would increase.
(third option)
an erlenmeyer flask contains 15.00mL of 0.030 M HCI before titration. 5.00 mL of 0.050 of M NaOH is added to the HCI in the flask during titration. What is the mole ratio of acid (HCI) to base (NaOH) in the balanced neutralization equation?
0.05 to 0.03
1:1
1:2
which expression. gives the actual moles of base added?
0.050x5.00
0.030x0.015
0.050x0.005
How many moles of H+ will be present following neautralization?
0.25
0.00025
0.025
Answer:
1.1
0.050*0.005
0.00025
Explanation:
What is the major organic product obtained from the reaction of (R)-2-bromohexane with sodium cyanide/acetone
Answer:
Option C
Explanation:
The complete question is
What is the major organic product obtained from the reaction of
(R)-2-bromohexane with sodium cyanide/acetone?
A) ) trans-2-pentene
B) ( S)-2-Methylpentanenitrile
C) ( S)-2-Methylhexanenitrile
D) (plus or minus)-2-Methylpentanenitrile
Solution
This is an inversion reaction in which (R) 2 Bromohexane convert into (S) -2 – methyl hexane in the presence of Acetone and NaCN.
The reaction occurs through the SN2 mechanism and there is inversion of confiruration
Hence, option C is correct
Please help and explain how to do it need the answer asap, please.
Answer:
45 and 20 c2 Or4
Explanation:
HELP ME ASAP PLEASE
I need the answers I’m in a hurry
Answer: First box----Hail
Second Box-------Snow
Thrid Box-------Sleet
Forth Box-----Rain
Hope that helped! :)
Three solutions are mixed together to form a single solution; in the final solution, there are 0.2 mol Pb(CH3COO)2, 0.1 mol Na2S, and 0.1 mol LiCl present. find preciptate
Three solutions are mixed together to form a single solution. The precipitate in the solution is PbS and PbCl₂.
What are precipitates?Precipitates are the residues that are present in the solution. These residues are solid that came out of the solution.
Here given 3 compounds are water-soluble.
From the solution, we have to find the possible combination which is water-soluble.
Consider,
Pb(CH3COO)₂ Pb₂+(aq) + 2CH₃COO-(aq)
Na₂S₂Na+(aq) + S₂-(aq)
LiCl Li+(aq) + Cl-(aq)
Now consider a potential accumulation of positive and negative ions which is water-soluble.
The possible accumulations are,
PbS , PbCl₂
Ca(CH₃COO)₂ , CaS
Now viewing with solubility charge, we can find that both PbS and PbCl2 are water indissoluble and create a precipitate.
But both Ca(CH₃COO)₂ and CaS are water-soluble.
Therefore, the precipitates are PbS and PbCl₂.
To learn more about precipitates, refer to the link:
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For the reaction Cu2S(s)⇌2Cu+(aq)+S2−(aq)Cu2S(s)⇌2Cu+(aq)+S2−(aq), the equilibrium concentrations are as follows: [Cu+]=1.0×10−5[Cu+]=1.0×10−5 M, [S2−]=1.0×10−2[S2−]=1.0×10−2 M. The equilibrium constant is:
Answer:
1x10⁻¹²
Explanation:
Cu₂S(s) ⇌ 2Cu⁺(aq) + S²⁻(aq)At equilibrium:
[Cu⁺] = 1.0x10⁻⁵ M[S²⁻] = 1.0x10⁻² MThe equilibrium constant for the the reaction can be written as:
Keq = [Cu⁺]² * [S²⁻][Cu⁺] is squared because it has a stoichiometric coefficient of 2 in the reaction. Cu₂S has no effect on the constant because it is a solid.
Now we can calculate the equilibrium constant:
Keq = (1.0x10⁻⁵)² * 1.0x10⁻² = 1x10⁻¹²A radioactive nuclide is used to detect eye tumors. An atom of this radionuclide contains 15 protons, 15 electrons, and
17 neutrons. Which is symbol of this radionuclide?
Answer: ³²P
Explanation:
The radionuclide in question is known as Phosphorus-32. It is an isotope of Phosphorus that is radioactive and has one more neutron than the normal phosphorus does.
Phosphorus does not exist in nature and is created artificially by bombarding the normal stable phosphorus with neutrons. Due to its radioactive nature, it has proven to be useful in the medical industry where it has been used to detect eye tumors as well as in treating some diseases.
PPLLLLLZZZZZ HELPPPPPPPPP ME WITH THIS QUESTION BRAINLIEST ANY ANSWERS WOULD BE GREATLY APPRECIATED :) chemical reaction will stop when the limiting reactant is used up.Question 1 options:
True
False
I believe that this statement is true
Fill the missing blank
i’m generally confused about this so if anyone could help me it would mean a lot!!!!
Answer:
The answers to your questions are given below.
Explanation:
1. The symbol of Zinc is Zn
2. Determination of the proton number
Atomic number is simply defined as the number of protons in the nucleus of an atom. Mathematically, it is expressed:
Atomic number = proton number
Atomic number = 30
Therefore,
Proton number = 30
3. Determination of the neutron number
Mass Number = 65
Proton number = 30
Neutron number =?
Mass number = Proton + Neutron
65 = 30 + Neutron
Collect like terms
65 – 30 = Neutron
35 = Neutron
Thus,
Neutron number = 35
4. Determination of the electron number
Since the element is in it's ground state (i.e it has no charge), thus, the number of protons of the element is the same as number of electrons i.e
Electron number = proton number
Proton number = 30
Thus,
Electron number = 30
A sample of sodium reacts completely with 0.497 kg of chlorine, forming 819 g of sodium chloride. What mass of sodium reacted?
Express your answer to three significant figures and include the appropriate units.
Answer:
[tex]819 \: g = 819 \times {10}^{ - 3} \: kg = 0.819 \: kg \\ 0.819 \: kg - 0.497 \: kg \\ = 0.322 \: kg[/tex]
Help.
Work needs to be shown
show equations and how you did it
Answer:
436.8 mmHg.
Explanation:
From the question given above, the following data were obtained:
Total pressure (Pₜ) = 0.93 atm
Pressure of N₂ (Pₙ₂) = 270 mmHg
Pressure of O₂ (Pₒ₂) =?
Next, we shall convert the total pressure to mmHg . This can be obtained as follow:
1 atm = 760 mmHg
Therefore,
0.93 atm = 0.93 × 760 mmHg / 1 atm
0.93 atm = 706.8 mmHg
Finally, we shall determine the pressure of the O₂. This can be obtained as follow:
Total pressure (Pₜ) = 706.8 mmHg
Pressure of N₂ (Pₙ₂) = 270 mmHg
Pressure of O₂ (Pₒ₂) =?
Pₜ = Pₙ₂ + Pₒ₂
706.8 = 270 + Pₒ₂
Collect like terms
706.8 – 270 = Pₒ₂
436.8 = Pₒ₂
Pₒ₂ = 436.8 mmHg
Thus, the pressure of O₂ is 436.8 mmHg