A thermos slows down the process of heat transfer as it minimizes the process of conduction and convection.
What is conduction?
Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules ,
When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
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why does iodine have a lower atomic mass than tellurium
Why is alchemy no longer accepted?
A. Alchemists were not able to turn other metals into gold.
B. Scientists used evidence, analysis, and experiments to disprove
alchemy.
c. Alchemy became less popular once Aristotle died.
O D. The discovery of radioactivity took people's attention away from
alchemy
i think the answer is B. scientists used evidence, analysis, and experiments to disprove Alchemy. apologies if its incorrect.
What is the main process that happens in the mantle?
Answer:
Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. The Earth's surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.
I think it is helpful for you!!!!
Please make me brainliest..
Which of the following physical properties would tell you about an element's mass per unit volume ratio?
hardness
boiling point
crystalline shape
density
all of the above
Answer:
It's the density
The electronegativity of an atom generally _____ going up columns and _____going right to left across rows. An element like calcium
would most likely form a(n) _____ bond with an element like nitrogen.
1. increases: increases: covalent
2. increases; increases : ionic
3. increases; decreases : ionic
4. decreases; decreases ionic
5. decreases: increases : ionic
6. decreases; increases covalent
7. decreases; decreases covalent
8. increases; decreases : covalent
Answer:
8
Explanation:
It increases going up, because atom size is smaller, with greater energy levels; going right to left decreases, because they will have smaller charges when going through right to left.
Then, Calcium (Ca) is non-metal that reacts with Nitrogen (N), a non-metal. When 2 non-metal elements become a compound, it's covalent. Therefore, the bond between both of the elements are covalent.
What isotope forms when radon-215 emits two alpha particle and three gamma rays
5. Element X has two isotopes: X-100 and X-104. If the atomic mass of X is 101
amu, what is the relative abundance of each isotope in nature?
Answer:
The abundance of X-100 is 75 percent, and X-104 has an abundance of 25 percent. The answers are found by solving two equations with two unknowns, which are A plus B equals 100, and 100A plus 104B equals 10,100.
The relative abundance of each isotope in nature
X-100 = 75%
X-104=25%
By dividing the total number of ions identified by the number of ions with a particular m/z m/z m/z ratio, one may determine the relative abundance for each individual ion in the sample.
How can the abundance of two isotopes be determined?
For chemistry problems involving relative abundance, use the following formula:
(M1)(x) + (M2)(1-x) = M (E)
Find the relative abundance of the isotopes if one nitrogen isotope, nitrogen-14, has a mass of 14.003 amu and another, nitrogen-15, has a mass of 15.000 amu.
Algebra can be used to find x. ...
x = 0.996
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A wind turbine transfers energy from
energy stores. What one word
completes the sentence?
Answer:
The word "transfers" completes the sentence.
Explanation:
A wind turbine transforms the mechanical energy of wind into electrical energy. A turbine takes the kinetic energy of a moving fluid, air in this case, and converts it to a rotary motion. As wind moves past the blades of a wind turbine, it moves or rotates the blades. These blades turn a generator.
Hope This Helps!
Answer:
The right answer is "kinetic"
Explanation:
Wind is moving, so has kinetic energy.
trộn 100ml dung dịch HCL 0.1M với 100ml dung dịch H2SO4 0,05
Which of the flowing painting did Miss meacham set up against the bread counter?
What is the last step in the scientific method?
Answer:
D. Communication of results
Answer:
b.
conclusion
because it gives the overall information about the experiment
Which is not the correct grouping of elements? (Refer to periodic table)
A. Argon, potassium, slicon, strontium
B. Darmstadtum, nickel, piatinum, palladium
C. Barum berrylium, calcium, radium
D. Cesium, hydragon, lithium, sodium
Please help me guys..I need the answer ASAP!..(｡ŏ﹏ŏ)(╥﹏╥)
The incorrect grouping of elements is Argon, potassium, slicon, strontium.
What is periodic table?Periodic table is a systematic arrangement of chemical elements within the coloums and rowns on the basis of their properties.
In all options given elements belongs from the same group except the first one, beacuse in argon, potassium, silicon & strontium all are present in different groups of periodic table. As argon is present in the 18th group, potassium is present in the 1st group, silicon is present in the 14th group and strontium is present in the 2nd group of the periodic table.
Hence, correct option is (A).
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PLEASE HURRY AND TELL ME THE ANWERS
Answer:
Explanation:
helppppppppppppppp please please please
Answer:
For your first one it is C and your second one is D how deep is the lake.
Its going to be disicult to swim down at the bottom of a lake with all your class just to see how deep it is, so its better to make a model
Density is a ___ that ____ the ____ of an object to its ______
Answer:
matter , equals , weight , size
Determinar los gramos de ácido clorhídrico que se requiere para preparar 500 ml de solución 0.2 M de ácido clorhídrico
Answer:
m = 3.65 gram
Explanation:
ácido clorhídrico = HCl
M = m/Mr × 1000/mL
0.2 M = m/36.5 gr/mol × 1000/500 mL
0.2 M = m/36.5 gr/mol × 2
m/36.5 gr/mol = 0.2 M/2/L
m/36.5 gr/mol = 0.1 mol
m = 36.5 gr/mol × 0.1 mol
m = 3.65 gram
NEED ANSWER ASAP
Concerning chromatography, why do different colors in the ink separate?
A)Some colors had a greater repulsion for the paper or water. The colors that had a greater repulsion for the paper moved faster, and those with a greater repulsion for the water moved slowly up the paper.
B)Some colors had a greater affinity for the paper or water. The colors that had a greater affinity for the water moved faster, and those with a greater affinity for the paper moved slowly up the paper.
C)Some colors had a greater repulsion for the paper or water. The colors that had a greater repulsion for the water moved faster, and those with a greater repulsion for the paper moved slowly up the paper.
D)Some colors had a greater repulsion for the paper or air. The colors that had a greater affinity for the air moved faster, and those with a greater affinity for the paper moved slowly up the paper.
E)Some colors had a greater affinity for the paper or water. The colors that had a greater affinity for the paper moved faster, and those with a greater affinity for the water moved slowly.
Substances that have greater affinity for the solvent travel faster while the substance that have greater affinity for the paper travel more slowly.
Chromatography involves a mobile phase and a stationary phase. The mobile phase is the solvent that carries the mixture. while the stationary phase is the medium that performs the actual separation
The speed with which components of the ink moves up the paper depends on its affinity for the paper or the water.
The different colors in the ink separate because some colors had a greater affinity for the paper or water. The colors that had a greater affinity for the water moved faster, and those with a greater affinity for the paper moved slowly up the paper.
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I'LL MARK BRAINLIST
Lab: Kinetic Energy
I NEED TWO PARAGRAPHS ABOUT THE LAB AND ABOUT KINETIC ENERGY
Answer:
In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.
In classical mechanics, the kinetic energy of a non-rotating object of mass m traveling at a speed v is 1/2*mv^2. In relativistic mechanics, this is a good approximation only when v is much less than the speed of light.
The standard unit of kinetic energy is the joule, while the English unit of kinetic energy is the foot-pound.
Explanation:
Don't directly copy and paste this because you will get flagged for plagiarism. Just type this out in your own words and change a few of the words to their synonyms.
the only report that will fool the teachers
1.What is another term for the 24 hour clock?
Answer:
military time
Explanation:
military time
The best way to get the sugar out of a sugar-water solution is to __________.
Answer:
Distillation is the process by which sugar can be separated from the sugar solution.
Explanation:
Distillation, or classical distillation, is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation.
Answer:
Boil the water, this would cause the water to evaporate and will leave behind the sugar crystals, which is known as distillation.
when food looks bad this type of food spoilage is usually due to
microbial growth
nitrates
organic acids
sulfides
Answer:
microbial growth
Explanation:
food that is not properly kept at a proper temperature bacteria will grow causing spoilage
What does temperature indirectly measure? 1)Sound 2)Thermometers 3)Chemical Reactions 4)Heat
Answer:
Heat
Explanation:
Temperature is the average thermal energy (or heat) in a substance. Sound isn't really related, thermometers measure temperature, and chemical reactions can produce heat, but none of those are measured by temperature.
Mountains form when plates _______.
collide (convergent boundary)
have faulting occur
divide (divergent boundary)
slide past each other (transform boundary
Answer:
They form when plates collide. I hope this helps you!
What is sliver?
[tex]silver[/tex]
Chemical element
Silver is a chemical element with the symbol Ag (from the Latin argentum, derived from the Proto-Indo-European h₂erǵ: "shiny" or "white") and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal.
Explanation:
Silver is a chemical element with the symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal.
How many metals, nonmetals and metalloids are there in the periodic table?
Answer:
113 because there are 113 elements
Explanation:
Which is a chemical property of hydrogen?
A.
It is a light gas.
B.
It is a combustible gas.
C.
It is a colorless gas.
D.
It has a boiling point of -252.87°C.
E.
It is a good conductor of electricity.
Answer:
CExplanation:
It is a colorlessI hope you help by my answee
1. A sample of nitrogen occupies a volume of 250 mL
at 298 K. What volume will it occupy at 268 K?
Answer:
0.225 L = 225 mL
Explanation:
Charles' Law states that for a fixed pressure, the volume is directly proportional to the temperature, which means things expand at the same rate as the rate of it being heated up
Mathematically, we can write that as:
V1/T1 = V2/T2, where 1 and 2 are the two situations
So, when we substitute the values in, we get:
0.25 L/298 K = V2/268 K
Rearranging this, we get:
(0.25/298) x 268 = 0.225 L = 225 mL.
This also makes sense, as the volume reduced a little when the temperature reduced (cooled down)
Let me know if this makes sense, and hope I helped! :)
___+___=__KOH+H2 It Is chemistry question
Answer:
It's from the quation:
[tex] \boxed{ \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }}[/tex]
(How did I know?)
I learnt it while studying the elements of group 1.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Group 1 elements:K, here, is Potassium. It's position in the periodic table is Group 1, Period 4.
Group 1 elements are also called Alkali metals. Group 1 elements have 1 electron in their valence shell(outermost shell), the electron that takes part in chemical reactions.Valance electrons of elements of this group contribute to the valency of the group's elements I.e.,
valency of Alkali metals is 1!
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Reaction with water:Alkali metals react vigorously with cold water to form their hydroxides alongwith the evolution of Hydrogen gas.What are hydroxides?
Hydroxides of an element comprises one atom each of oxygen and Hydrogen bonded together, acting as an anion, the hydorxide anion — OH-.
Example:
KOH (hydroxide of Potassium) NaOH (Hydroxide of Sodium)- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Back to the question:In the question, The reactants are missing but the products are known, that are, Potassium Hydroxide and water.
Keeping the above mentioned property in mind, the reactants come clear as Potassium(K) and Cold water(H2O).
that makes the equation:
[tex] \mathsf{K + H_2O \rightarrow \: KOH + H_2 }[/tex]
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Balancing the equation:For an equation to be balanced, the number of atoms of each elements on both side of the equation must be equal.
Number of atoms of each element on the LHS:
K = 1 H = 2O = 1(subscript in front of an atom represents its number of atoms in the compund)
Number of atoms of each element on the LHS:
K = 1 H = 1 + 2 = 3O = 1The number of Hydrogen atoms on boths sides is NOT balanced!
Hit and trial method:
If we add a "2" in front of K, H2O and KOH
[tex] \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }[/tex]
Number of atoms on both the sides become equal.
(TIP: This comes thru practice:/. but main point is even out the oxygen and Hydrogen atoms first. like if it's 3 multiply it by 2 and you get an even number, I.e., 6)
Number of atoms of each element on the LHS:
K = 2H = 4O = 2Number of atoms of each element on the LHS:
K = 2H = 2 + 2 = 4 O = 2- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Answer:Hence, the balanced form of the equation is:
[tex] \boxed{ \mathsf{ \underline{2K} +\underline{2 H_2O} \rightarrow \:\underline{2}KOH + H_2 }}[/tex]
What two factors must be held constant for density to be a constant ratio?
The two factors which must be held constant for density to be a constant ratio are: Mass and Volume
As we know, the density of a material is simply defined as the ratio of mass to volume.
In essence, Density = Mass/VolumeConsequently, To obtain a constant ratio for density, the mass and volume of the material in discuss must be kept constant.
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How many moles of hydrogen gas would be required to produce 25 moles of H2O?
The balanced equation for the production of water from hydrogen gas is
2H₂ + O₂ → 2H₂O
Based on the balanced equation, for every mole of hydrogen, a mole of water is produced.
∴ Since the moles of water = 25 moles
then the moles of hydrogen gas = 25 moles25 moles of H₂ (hydrogen gas) are required to make 25 moles of H₂O.
What is Stoichiometry ?Stoichiometry is an important concept which helps us use the balanced chemical equation to measures the amount of reactants and products.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the left hand side that is reactant side is equal to the number of atoms on the right hand side that is product side in an equation.
First we have to write the Balanced chemical equation
2H₂ + O₂ → 2H₂O
To produce 2 moles of water, 2 moles of hydrogen are required to produce 25 moles of water.
According to the Stoichiometry
[tex]\frac{2\ \text{moles of}\ H_2}{2\ \text{moles of}\ H_2O} \times 25\ \text{moles of}\ H_2O[/tex]
= 25 moles of hydrogen gas is required
Thus, from above conclusion we can say that 25 moles of H₂ (hydrogen gas) are required to make 25 moles of H₂O.
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A hypothetical element has an atomic weight of 42.8452 amu. There are three main isotopes of this element with mass numbers of 41, 43 and 44. The 44 amu isotope has a 8% abundance. What is the percent abundance of the isotope with the mass number of 41?
1. 7.740%
2. 12.04%
3. 92.26%
4. 46.00%
5. 12.34\%
Answer:
Answer is 46.00%
Explanation:
absolute mass= A1F1 +A2F2
100
42.8452= 44×8% + 41×( 100--F2)
100
so you get
F2= 46.00%
am not sure
