Answer:
It is the proportion of atoms of an isotope in a sample of an element taken from the natural world.
Explanation:
The radius of a single atom of a generic element X is 169 picometers (pm) and a crystal of X has a unit cell that is body-centered cubic. Calculate the volume of the unit cell.
The volume of the unit cell is 2.67 x 10⁻²⁸ m³.
What is the volume of a unit cell of a body-centered cubic crystal?In a body-centered cubic unit cell, the volume occupied by the particles of the substance is about 68% of the total unit cell.
Assuming that a single atomic a sphere, the volume is:
Volume(atom) = 4/3 x π x r³
Volume(atom) = 4/3 x π x (169 x 10⁻¹²)³
Volume(atom) = 2.02 x 10⁻²⁹ m³
There are a total of 9 atoms in a body-centered unit cell, so the total volume occupied by atoms is:
2.02 x 10⁻²⁹ x 9
= 1.82 x 10⁻²⁸ m³
Volume of cell = (1.15 x 10⁻²⁸ ) / 0.68
Volume of cell = 2.67 x 10⁻²⁸ m³
Therefore, the volume of the unit cell is 2.67 x 10⁻²⁸ m³.
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what is the shape of the molecule that has 2 atoms bonded to a central atom and 1 lone pair of electrons
When there are two bond pairs and one lone pair, the molecule will have a bent molecular shape.
What is the shape of a molecule?The shape of a molecule depends on the orientation and number of electron pairs on the valence shell of the central atom in the molecule. This is based on the postulates of the valence shell electron pair repulsion theory.
When there are two bond pairs and one lone pair, the molecule will have a bent molecular shape.
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To what temperature must a balloon, initially at 9°C and 4.00 L, be heated in order to have a volume of 6.00 L?
The balloon must be heated to a temperature of 150 °C in order to have a volume of 6.00 L.
How are volume and temperature of gases related?The volume of a gas is directly proportional to the temperature of the gas.
According to Charles' law: V1/T1 / = V2/T2
V1 =4.0 L
T1 = 9°C = (273. + 9) K = 282 K
V2 = 6.0 L
T2 = ?
T2 = V2×T1/V1
T2 = 6 × 282 / 4 = 423 K
423.2 K = 423 -273 = 150 °C
Therefore, the balloon must be heated to a temperature of 150 °C in order to have a volume of 6.00 L.
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Which class of organic compound would neutralize a carboxylic acid?
Answer:
amine
Explanation:
amine is a base
base would neutralize an acid
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Answer:
amine
Explanation:
LIMITED TIME I WILL MARK BRAINLYEST
The stored energy an object has due to its position is ?
energy.
kinetic
potential
gravitational
work
Explanation:
potential energy is the correct answer
HELPP!!
Methane (CH4) undergoes combustion. Which products form?
A. CO₂ and H₂
B. C and H₂O
C. CO₂ and H₂O
D. CO₂, H₂O, and 02
Answer: C. CO₂ and H₂O
Explanation:
Combustion reactions produce carbon dioxide and water.
Lipid-soluble hormones can't be stored within vesicles.
Select one:
O True
O False
Answer:
true
Explanation:
they can not be stored within the vesicles
Two identical syringes are filled to the same volume at the same temperature and pressure. If one
syringe is filled with chlorine gas and the other with nitrogen gas
A. the syringe filled with nitrogen gas contains more moles of gas.
B. the syringe filled with nitrogen gas contains more grams of gas.
C. the different gases have the same average kinetic energy.
D. the molecules of chlorine gas have a higher average velocity than the molecules of nitrogen gas.
Could someone explain why the answer is C?
The temperature is the same, so the amount of kinetic energy will also be the same.
100 POINTS! Final Honor Activity Question
An unbreakable meteorological balloon is released from the ground. Ground level pressure is 98.5 kPa and the temperature is 18oC. The balloon contains 74.0 dm3 of hydrogen gas. As the balloon ascends, the pressure drops to 7.0 kPa.
What is the new volume of the balloon, assuming no temperature change?
If a temperature drop of 80oC occurs, what is the new volume of the balloon?
Of the two factors, pressure and temperature, which had the greatest effect in changing the volume of the balloon? Support your answer with your calculations.
Approximately 160 km above the Earth the pressure of the atmosphere is about 3.00 x 10-4 Pa and the temperature is about -180oC. If 100 cm of a gas at STP is released at this distance from the Earth, what volume would it occupy?
The change in temperature had the greatest effect at changing the volume of the balloon.
What are the gas laws?The gas laws are used to describe the parameters that has to do with gases.
Given that;
P1 = 98.5 kPa
T1 = 18oC or 291 K
V1 = 74.0 dm3
P2 = 7.0 kPa
V2 = ?
T2 = 18oC or 291 K
P1V1/T1 = P2V2/T2
P1V1T2 =P2V2T1
V2= P1V1T2/P2T1
V2 = 98.5 kPa * 74.0 dm3 * 291 K/ 7.0 kPa * 291 K
V2 = 1041.3 dm3
When;
V1 = 1041.3 dm3
T1 = 291 K
V2 = ?
T2 = 80oC or 353 K
V1/T1 = V2/T2
V1T2 = V2T1
V2 = V1T2/T1
V2 = 1041.3 dm3 * 353 K/291 K
V2 = 1263 dm3
The change in temperature had the greatest effect at changing the volume of the balloon.
Given that
V1 = 100 cm^3
T1 = 273 K
P1 = 1.01 * 10^5 Pa
V2 = ?
P2 = 3.00 x 10^-4 Pa
T2 = -180oC or 255 K
V2= P1V1T2/P2T1
V2 = 1.01 * 10^5 Pa * 100 cm^3 * 255 K / 3.00 x 10^-4 Pa * 273 K
V2 = 3.14 * 10^10 cm^3
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advantages of artificial silk over natural silk
Answer:
Less expensive than natural fibers
Strong and long-lasting
Easily available
Easy to maintain
Dry up quickly
What is the product of the unbalanced equation below?
H₂(g) + Cl₂(g) →
The Periodic Table
OA. H₂(g) + Cl₂(g)
OB. H₂Cl₂(9)
O C. HC1₂(g)
OD. HCI(g)
D
Explanation:
B/c both the hydrogen and chlorine have the same valance number so if a metal or non metal have the same valance number you should cancel out the numbers and you will have to put only the non metal or metals.
Which statement below is true about a nuclear power plant?
O There is no air pollution from its operation.
O It produces less electricity than a coal-burning power plant.
O No fuel is needed for this type of power plant.
O It is not possible for a leakage of nuclear material.
Answer:
There is no air pollution
Explanation:
Unless there is a meltdown.
Nuclear plants generate far more power than coal plants
FUEL is needed....nuclear fuel
Leakage CAN happen.... see info on Three Mile Island or Cchernobryl (Ukraine)
A chemical reaction can be reversed if?
The energy of the reactants exceeds the activation energy threshold.
The energy of the products exceeds the activation energy threshold.
The energy of the reactants is less than the activation energy threshold.
The energy of the products is less than the activation energy threshold.
Answer: The energy of the products exceeds the activation energy threshold.
Explanation:
In the reverse reaction, the reactants of the forward reaction are now the products of the reverse reaction and vice versa.
This means that normally since you would need the energy of the reactants of the forward reaction to exceed the activation energy threshold, in the reverse reaction, the energy of the products would need to exceed the activation energy threshold.
A chemistry graduate student is studying the rate of this reaction:→2Cl2O5g+2Cl2g5O2gShe fills a reaction vessel with Cl2O5 and measures its
Rate = 1.321M/s[H₂CO₃]¹ ; k = 1.32M/s
How many mL 18.0 M H₂SO4 is needed to make 1.50 L of 0.120 M H₂SO4?
mL
PLEASE HELP I need to do it tonight
Answer: You would need 0.67 liters of the concentrated acid. ... To solve for V 1 , multiply 4.0 Molar by 3.00 L and divide by 18.0 M. V1 = M2.V2M1.
Explanation:
What is the mass percent of oxygen in Nickel (III) sulfate?
The mass percent of oxygen in Nickel([tex]III[/tex])sulfate is [tex]23.68[/tex] percent.
At first, we look up the atomic masses for the element from the periodic table.
The atomic masses are found to be:
Ni is [tex]58.7[/tex]S is [tex]32[/tex]O is [tex]16[/tex]Next, we determine how many grams of each element are present in one mole of [tex]Ni_{2}(SO_{4})_{3}[/tex]
[tex]117.4g(2 mol*58.7)[/tex] of Ni[tex]96g(3 mol*32)[/tex] of S[tex]192g(12 mol * 16.00)[/tex] of OThe mass of one mole [tex]Ni_{2}(SO_{4})_{3}[/tex] is:
[tex]117.4g+96g+192g=405.4g[/tex]
So, The mass percent of oxygen [tex]=(96g/405.4)*100=0.2368*100%\\[/tex]
[tex]=23.68 %[/tex] percent.
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https://brainly.com/question/25255030you have a sample of.neon gas that you want to use to.make a glowing sign. you investigate that the gas sample is at 45c and has a volume of 10 liters. when you place the sample of neon gas your fridge you observe the temperature descreasing to 13.5
the density of 190mg of a liquid is 0.0076g/cm calculate the volume in ml
[tex]\\ \rm\Rrightarrow Density=\dfrac{Mass}{Volume}[/tex]
[tex]\\ \rm\Rrightarrow Volume=\dfrac{Mass}{Density}[/tex]
[tex]\\ \rm\Rrightarrow Volume=\dfrac{0.19}{0.0076}[/tex]
[tex]\\ \rm\Rrightarrow Volume=25cm³[/tex]
[tex]\\ \rm\Rrightarrow Volume=25mL[/tex]
How many moles of C are formed upon complete reaction of 2 mol of B according to the generic chemical reaction:
A + 2 B=C
The magnet below is cut in half. What will be the result
the cut pieces will have their own north and south pole
A lead ball is added to a graduated cylinder containing 50.6 ml of water, causing the level of the water to increase to 93.0 mL. What is the volume in milliliters of the lead ball, Vieras? Viead =
42.4 ml is the volume in milliliters of the lead ball if a lead ball is added to a graduated cylinder containing 50.6 ml of water.
What is a graduated cylinder?A tall narrow container with a volume scale is used especially for measuring liquids.
The graduated cylinder contains water
mL is a volume unit.
Water volume = 50.6 ml
The lead ball caused an increase in volume from 50.6 ml to 93.0 mL.
The new volume is the lead ball volume plus the original water volume :
Final volume = Vlead ball+ Water original volume
[tex]93.0 mL= V_(lead ball) +50.6 ml[/tex]
[tex]V_(lead ball) = 93.0 mL - 50.6 ml[/tex]
[tex]V_(lead ball) = 42.4 ml[/tex]
Hence, 42.4 ml is the volume in milliliters of the lead ball.
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A piece of metal weighing 500g is put into a boiling (100 degrees C) water bath. After 10 minutes, the
metal is immediately placed in 250g of water at 40°C. The maximum temperature that the water reaches
is 50°C. What is the specific heat of the metal? (The Specific heat of water is 1.0 cal/g x°C). Show your
calculations!
thermometer
The specific heat of the metal is calculated using the change in temperature, heat, and mass. The specific heat of the metal is 0.21 J/g °C.
What is heat energy?Heat energy is a transfer of the energy lost by a system to the energy gained by another system. The calorimeter is used to measure the specific heat of the system.
Given,
Mass of metal = 500 gm
Temperature = 100 °C
Mass of water = 250 gm
Temperature = 40 °C
Specific heat of water = 4.184 J/g °C
The specific heat (c) of metal is calculated as:
Q = mC ΔT
and, Q (metal) = Q (water)
Substituting values in the above equation:
(500 )(c)(100) = (250)(4.184)(50-40)
50000 c = 10460
c = 0.21 J/g °C
Therefore, the specific heat of metal is 0.21 J/g °C.
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Assistance please
Which of the following ions is formed when the positive hydrogen ions from an acid bond to water molecules? (4 points)
H−
OH−
H2O+
H3O+
I think the last one but I am not sure
Explanation:
help me to find Xian pleaseee:( i miss him so much:(
sorry for answering Non sense po i hope u understand me ty po!
Answer:
H3O+
Explanation:
In an aqueous solution, polar water molecules remove one or more hydrogen ions from an acidic molecule (like HCl), leaving behind a negative ion (Cl−). The positive hydrogen ions from the acidic substance bond to water molecules to form hydronium ions (H3O+). In the reaction above, you can see that the acid donates the hydrogen ion. -FLVS
YW friends
If it help mind giving a thankz
:D
How many grams are in 27 L of O2 gas at STP
Answer:
Approx. 38.61 grams
I WILL GIVE BRAINLEST PLSSSS HELP!!!
What type of multimedia presentation can be planned using an outline?
1. an animation. created digitally using a program like Flash.
2. a presentation that lets users link our from a "home" page or slide.
3. a slide show that starts on slide one and goes slide by slide to the end
Answer: 3. a slide show that starts on slide one and goes slide by slide to the end
Explanation:
An outline is typically a plan with lists of steps and details about the timing, order, etc. In this case, the option that would most need a clear outline is option 3.
A slide show that starts on slide one and goes slide by slide to the end.
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Answer: a slide show that starts on slide one and goes slide by slide to the end
Explanation:
Which of the following CAN NOT be considered a single phase?
a) a pure liquid
b) a heterogeneous mixture
c) a homogeneous mixture
d( a pure solid
Answer:
b
Explanation:
Heterogeneous is a mixture of two or more things (phases)...the others are all one phase
In a laboratory investigation, a student separates
colored compounds obtained from a mixture of
crushed spinach leaves and water by using paper
chromatography. The colored compounds
separate because of differences in
(1) molecular polarity
malleability
(3) boiling point
(4) electrical conductivity
Answer:
Molecular polarity
Explanation:
tell me if im right
in an addition reaction, which bond of the reactant is broken?
A. carbon-hydrogen single bond
B. carbon-carbon single bond
C. carbon-carbon double bond
D. carbon-hydrogen double bond
Answer:
C. carbon-carbon double bond
Explanation:
A reaction in which two or more molecules combine together to result in the formation of a larger molecules then this type of reactions are known as addition reactions.
Usually compounds which contain a double bond undergo addition reactions.
For example, a compound with carbon-carbon double bond, carbonyl group, imine group etc undergo addition reaction.
Thus, we can conclude that in an addition reaction, carbon carbon double bond of the reactant is broken.
Carbon-carbon double bonds (unsaturations) are found in naturally occurring fatty acids.
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Which statement below is NOT true of fission?
O It is the splitting of a large nuclide into 2 smaller nuclei.
O Slow neutrons are fired at a large nucleus.
Released neutrons can be used to start more fission reactions.
The only products are two smaller isotopes.
The statement that is NOT true of fission is B. slow neutrons are fired at a large nucleus.
What is Nuclear fissionThis is the splitting of large nuclei to smaller ones. It could be a natural or spontaneous dissociation by radioactive decay, or can be initiated in in a laboratory under required conditions. It involves;
Splitting of large nuclei to two smaller onesRelease of large amount of energyNeutrons released can be used to initiate chain reactionsHence, the statement that is not true about fission is that slow neutrons are fired at a large nucleus.
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Which substance will form a solution when mixed with solid sodium chloride?
OA. NaO₂ (s)
O B. Cl₂(g)
O C. CCl4(0)
OD. CH₂OH()
The substance that will form a solution when mixed with solid sodium chloride would be CH₂OH
Solubility of NaClA solution is only formed when a solute dissolves in a solvent.
In this case, [tex]CCl4_[/tex] and CH₂OH are the only liquid solvents. However, NaCl is insoluble in [tex]CCl_4[/tex] while it is soluble in CH₂OH due to its polarity.
Thus, NaCl can form a solution only with CH₂OH.
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The substance that will form a solution when mixed with solid sodium chloride would be CH₂OH.
What is the solution?A solution is only formed when a solute dissolves in a solvent.
In this case, CH₂OH are the only liquid solvents. However, NaCl is insoluble in while it is soluble in CH₂OH due to its polarity and Common-Ion Effect.
Thus, NaCl can form a solution only with CH₂OH.
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