During ________________________, a new nuclear membrane forms around eachgroup of chromosomes.
Answer:
Telophase
Explanation:
I looked up the ending lol!hope this helps
How might the information on melting point, boiling point, and flammability be useful to materials scientists
The information on melting point, boiling point, and flammability might be useful to materials scientists as:
What is Melting point?The temperature for the pure substance at which the liquid and solid phase exist in equilibrium condition
What is Boiling point?The temperature at which the vapour pressure of the liquid is equal to the atmospheric pressure.
What is flammability?Flammability is the ability of a substance such as solid, liquid and gases to ignite in air if source of ignition is applied.
Material scientist apply the knowledge of physical and chemical properties of different compounds to synthesize new product or improve existing ones.
Hence to know the knowledge about melting point, boiling point, flammability might be necessary conditions for material scientist.
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Using the expression Ka=[H+][A−][HA] , explain how to determine which solution has the lower pH , 0.10MHF(aq) or 0.10MHC2H3O2(aq) . Do not perform any numerical calculations.
Answer:
0.10MHF(aq)
Explanation:
Given that:
[tex]K_a = \dfrac{[H^+][A^-]}{HA}[/tex] , to find the solution with a lower pH between 0.10MHF(aq) or 0.10MHC2H3O2(aq).
Recall that:
The higher the Ka value, the higher the ionization, hence more formation of protons in the solution. Also, higher H⁺ in solution results in a lower pH value.
Since HF have a higher Ka value, then HF solution will have a lower pH.
The acidity and alkalinity measure of a substance based on hydroxyl or hydrogen ion released is called pH. It is measured based on the pH scale that tells about the acidity and basicity of the substance.
0.10 M [tex]\rm HF[/tex] (aq) has lower pH.
The pH can be explained as:The acid dissociation constant ([tex]\rm K_{a}[/tex]) is given by,
[tex]\rm K_{a} = \dfrac{[H^{+}][A^{-}]}{[HA]}[/tex]
The value [tex]\rm K_{a}[/tex] of can be used for determining the lower and higher pH.When the [tex]\rm K_{a}[/tex] value is high then the ionization of the substance will be higher resulting in the release of more protons in the solution.When [tex]\rm H^{+}[/tex] is high then the pH will be lower and the solution will be more acidic.The [tex]\rm K_{a}[/tex] value of [tex]\rm HF[/tex] is more compared to the [tex]\rm HC_{2}H_{3}O_{2}[/tex] resulting in lower pH and more acidity.Therefore, 0.10 M [tex]\rm HF[/tex] (aq) has lower pH.
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A chef is cooking with a 2000-gram stainless steel skillet. Stainless steel has a specific heat capacity of 0.450 J/(g *oC). How much heat energy is required to raise the temperature of the skillet from 25oC to 125oC?
Group of answer choices
44,000 Joules
90,000 Joules
22,500 Joules
855 Joule
Answer:
Q = 90,000 J
Explanation:
Given data:
Mass skillet = 2000 g
Specific heat capacity = 0.450 J/g.°C
Energy required to raise temperature = ?
Initial temperature = 25°C
Final temperature = 125°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 125°C - 25°C
ΔT = 100°C
Q = 2000 g × 0.450 J/g.°C × 100°C
Q = 90,000 J
Which of the following is a necessary product of a combustion reaction?
A. A precipitate
B. Heat
C. A hydrocarbon
D. Oxygen
Answer:
B. Heat
Have a nice day everyone!
To solve such this we must know the concept of combustion reaction. Therefore, heat is a necessary product of a combustion reaction. The correct option is option B.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Combustion reaction is a reaction in which a substance, basically hydrocarbons burns in presence of oxygen to produce carbon dioxide and water and heat in huge amount.
Therefore, heat is a necessary product of a combustion reaction. The correct option is option B.
Learn more about the chemical reactions, here:
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what are the parts of a chemical change
Answer:
These include decomposition, synthesis, displacement, acid-base, combustion, oxidation-reduction, electrochemical
Answer:
Chemical Reaction Parts:
These include decomposition, synthesis, displacement, acid-base, combustion, oxidation-reduction, electrochemical, and myriad others.
Explanation:
Seven Things That Indicate a Chemical Change Is Occurring
Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas. ...
Formation of a Precipitate. ...
Color Change. ...
Temperature Change. ...
Production of Light. ...
Volume Change. ...
Change in Smell or Taste. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.
2) If I have an unknown quantity (# of moles) of gas at a pressure of 32 atm, a volume of 70 L, and a temperature of 25˚C. How many moles of gas are in the sample?
Answer:
91.5 mol
Explanation:
Volume of gas = 70 L
Temperature = 25°C
Pressure = 32 atm
Moles of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
25+273.15 = 298.15 K
By putting values,
32 atm × 70 L = n ×0.0821 atm.L /mol.K × 298.15 K
2240 atm.L = n ×24.48 atm.L /mol
n = 2240 atm.L / 24.48 atm.L /mol
n = 91.5 mol
An ionic bond is a bond that forms between
A. ions with opposite charges
B. atoms with neutral charges
C. one atom's nucleus and another atom's electrons
D. the electrons of two different atoms
Answer:
A. ions with opposite charges
Explanation:
Ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.
I need help please help me !
Answer:
the rust formed because of the water sitting in sied a metal bowl for long time but they can fix this if they get filters
Explanation:
Which of the following is not a unit of volume? (A) L (B) mL (C) m3 (D) cm2
HELP PLS IT DUE TODAY!!!!!
Answer: Choice D) cm^2
This is the same as saying "square cm". This is a unit of area, and not a unit of volume. Consider a 1 cm by 1 cm square. It's area is 1 square cm. As another example: a rectangle with sides 7 cm by 14 cm has area 14*7 = 98 cm^2.
Much like how 5*5 = 5^2, we apply this idea to the units which is why cm*cm = cm^2.
Please help me, Thank you!
Answer:
2
Explanation:
The atom shown in the image has 2 core electrons.
Electrons are the negatively charged particles within an atom. Therefore the total number of electrons surrounding the nucleus in the given specie is 7.
So;
We have 2 core electrons
And 5 valence electrons
The core electrons are the inner orbital electrons.
The valence electrons are the outermost electrons.
The photo shows a frozen juice pop on a hot day.
Which detail could be added to the photo to model the thermal energy
transfer that is taking place?
A. Arrows pointing from the juice pop to the sun
B. Arrows pointing from the persons hand to the juice pop
C. Circles with arrows on the top of the juice pop
D. Arrows pointing from the sun to the juice pop
Answer:
C! Hope this helps !:)
Explanation:
Answer:
Arrows pointing from the sun to the juice pop
Explanation: Trust I got it right
a toy car is pushed forward with a force of 5N. Air resistance and friction apply a combined force of 3.5N backwards, what is the resultant force
Answer:
Hi... U should do like this
5 - 3.5=1.5 (N)
Uranium contains two isotopes, U-235 with an atomic mas of 235 g/mol, and u-238 with an atomic mass of 238g/mol. U-235 is needed
as a fuel in nuclear reactors. Until recently, the method used to separate U-235 from U-238 was by gas diffusion. Use U-235 as R1, and
U-238 as R2 and determine the rate of diffusion and which gas will diffuse faster.
⚪︎U-235 diffused 10.01 times faster than U-238
⚪︎U-235 diffused 1.01 times slower than U-238
⚪︎U-235 effused 2.01 times slower than U-238
⚪︎U-235 effused 1.01 times faster than U-238
⚪︎U-235 diffused 1.01 times faster than U-238
Answer:
the answer is in the image
Explanation:
How are the electron structures of boron (B) and aluminum (Al) similar?
A. They both have valence electrons in the second energy level.
B. They both have 3 electrons in each sublevel.
C. They both have 1 electron in a p orbital.
D. The highest sublevel that has electrons is the 3p sublevel.
my brain isn't functioning correctly. 2 days up working on homework lol
Answer:
C: They both have 1 electron in a p orbital.
Explanation:
Find the electron configuration of B
Boron is 1s 2s2 2p1
Find the electron configuration of Al
Aluminum is 1s2 2s2 2p6 3s2 2p1
If you look at the p orbital, they both have 1 electron.
Therefore, the correct answer is C.
Hope it helped!
