With its surroundings, an open system can interchange both matter and energy. Since heat and water vapor can be lost to the air, the stovetop example would be considered an open system. On the other hand, a closed system can only interchange energy, not matter, with its surrounds.
Is the atmosphere a closed or an open system?All systems within the earth's atmosphere are thought of as open systems even if the earth itself is a closed system. An open system is one in which matter and energy can move between it and its environment.
An open system is one that permits the exchange of materials and energy with the environment. For instance, a hot soup bowl that is open, etc.
A closed system is one that only permits the interchange of energy with its surroundings and forbids the exchange of matter.
Systems types:
No energy enters or leaves an isolated area. Closed: Material does not exit, but energy does. Open: both matter and energy can enter and exit. Sunlight energy enters the closed system that is the Earth. and "no" stuff comes into or goes out (except for the rare meteorite).
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POSSIB
A student drops three balls of identical size but different masses from a height of one meter high into a container of sand.
The first ball has a mass of one gram.
The second ball has a mass of three grams.
The third ball has a mass of five grams.
Which ball will make the biggest crater in the sand and why?
(1 point for correct answer, 1 point for correct reason why)
B I
1
0/1
9 10 11 12 13 14 15
The third ball of 5 grams of mass will make the biggest crater in the sand because force is directly proportional to mass. so the greeter the mass, the greater its force and impact.
what is mass?Mass is described as the quantity of matter in a physical body.
Mass is also a measure of the body's inertia, the resistance to acceleration when a net force is applied.
Mass is always known to be constant for a body. We can calculate mass by:
Mass = volume × density.
Weight is the measure of the gravitational force acting on a mass. The SI unit of mass is the "kilogram"
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identify the expected color of each element in a model of a molecule.
The expected color of each element in a model of a molecule is black, red, blue, and white.
When we observe the model of a molecule in a color-based spectrum then we see different colors as the molecule is made up of different atoms.
So, in the full color-based spectrum, elements of organic carbon show different colors. It appears to be black, blue, red, and green.
However, in the color-based spectrum, carbon is black.
In the gaseous state, oxygen is colorless, however, in liquid form, it appears to have a pale blue color.
Nitrogen makes up a major portion of the atmosphere. The sky color appears to be blue due to nitrogen. Hence, nitrogen is blue. Hydrogen is a white colorless gas.
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The complete question is:
Identify the expected color of each element in a model of a molecule.
Carbon
Oxygen
Nitrogen
Hydrogen
A rock dropped in a graduated cylinder raises the level of water from 30mL to 45mL the Rock has a mass of 60g. What is the density of the rock ?
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property The density of rock is 1.33g/ml
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water
Mathematically,
Density = Mass of the rock ÷volume marked on the graduated cylinder
Substituting all the values in above formula, we get
Density = 60g÷45mL
= 1.33g/ml
Thus the density of the rock is 1.33g/ml
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How many moles are in 28 grams of carbon dioxide CO2
Answer:
0.636 moles
Explanation:
Complete answer:
Complete answer:The molecular weight of a material is required to tell an individual how many grams there are in one mole of that chemical substance i.e. molecular weight of any substance contains 1 mole of that substance. Then 28 g of $C{{O}_{2}}$ contains = 0.636 moles of $C{{O}_{2}}$.
3.
Find the correct element based on the information given (on the right side) and then drag
the element over.
Cesium
Magnesium
Bismuth
Bromine
Period 3 & Group 2A
Answer by dragging items here
Period & Group 7A
Answer by dragging items here
Period 6 & Group 1A
Answer by dragging items here
Period 6 & Group SA
Answer by dragging items here
Period 3 & Group 2A = Magnesium
Period & Group 7A = Bromine
Period 6 & Group 1A = Cesium
Period 6 & Group SA = Bismuth
What is groups and period in periodic table ?Groups - The horizontal row of the periodic table that represents an element's valence electron count.
Periods - The horizontal columns of the periodic table that represent an element's number of electron shells. Families: Compounds with comparable characteristics and the same number of valence electrons.
Elements in the periodic table can be divided into groups and eras. The periodic table is organised into horizontal rows for periods and vertical columns for groupings. As you proceed over a period or down a group, the atomic number rises.Learn more about Periodic table here:
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A standard solution of sodium carbonate was prepared by dissolving 10.6 g of the anhydrous salt in distilled water. The solution was then transferred to a standard flask and the total volume was adjusted to the 500 mL mark.Calculate the concentration of the sodium carbonate solution in mol/L.
ANSWER
The concentration of the solution is 0.2 mol/L
EXPLANATION
Given that;
The mass of sodium carbonate dissolved is 10.6 grams
The volume of the flask is 500mL
Follow the steps below to find the concentration of the solution
Step 1; Find the number of moles of the solute using the below formula
[tex]\text{ mole = }\frac{\text{ mass}}{\text{ molar mass}}[/tex]Recall, the molar mass of sodium carbonate is 106 g/mol
[tex]\begin{gathered} \text{ mole = }\frac{\text{ 10.6}}{\text{ 106}} \\ \text{ mole = 0.1 moles} \end{gathered}[/tex]The moles of sodium carbonate is 0.1 moles
Step 2; Convert the volume to liters
Let x represents the volume of the flask in liters
[tex]\begin{gathered} \text{ 1mL }\rightarrow\text{ 0.001L} \\ \text{ 500mL }\rightarrow\text{ xL} \\ \text{ cross multiply} \\ \text{ 1mL }\times\text{ xL = 0.001L }\times\text{ 500mL} \\ \text{ Isolate xL} \\ \text{ xL = }\frac{\text{ 0.001L }\times500\cancel{mL}}{1\cancel{mL}} \\ \text{ xL = 0.001}\times\text{ 500} \\ \text{ xL = 0.5L} \end{gathered}[/tex]The volume of the flask is 0.5L
Step 3; Find the concentration of the solution
[tex]\begin{gathered} \text{ Concentration = }\frac{\text{ 0.1}}{\text{ 0.5}} \\ \text{ concentration = 0.2 mol/L} \end{gathered}[/tex]Therefore, the concentration of the solution is 0.2 mol/L
A chemistry graduate student combines 3.90 grams of potassium and 12.7 grams of iodine to form potassium iodide. according to the law of conservation of mass, how much potassium iodide should be formed if the reaction proceeds to completion?
A chemistry graduate student combines 3.90 grams of potassium and 12.7 grams of iodine to form potassium iodide. according to the law of conservation of mass, potassium iodide should be formed after the reaction is complete is 16.70 g.
According to the law of conservation mass, in a chemical reaction mass can neither be created nor destroyed.
According to the law, mass of the reactant is always equal to the mass of product, because in a chemical reaction, mass can neither be created nor destroyed.
The balanced chemical reaction is -
2 K + I₂ → 2 KI
3.90 g + 12.7 g = 16.70 g
16.70 g = 16.70 g
Therefore, when the reaction proceeds to completion, 16.70 g product is obtained as the sum of reactants is 16.70 g and according to law of conservation of mass, mass is neither created nor destroyed but it only converts from one form to another form.
Hence, potassium iodide formed is 16.70 g.
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how do you convert the salts of organic acids back into their original form?
To convert the salts of organic acids back into their original form you have to alter the pH of solution.
What is pH of solution ?pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions . The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per liter, into numbers between 0 and 14.
pH is an important quantity that reflects the chemical conditions of a solution. The pH can control the availability of nutrients, biological functions, microbial activity, and the behavior of chemicals.
You may do this by including a mineral base, such sodium hydroxide. The proton will be eliminated by the mineral base, leaving the original organic molecule. The organic component has lost its charge and is no longer as soluble in water.
Thus, to convert the salts of organic acids back into their original form you have to alter the pH of solution.
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What is the number of electrons in an Al³+ ion?
A) 10
B) 13
C) 3
D) 16
Answer: there are 10 electrons associated with a single Al3+ ion.
Explanation:
7. According to the law of conservation of mass, the mass of the Must be equal to the mass of the
Answer:
According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products
Explanation:
law of conservation of mass
Which of the following correctly matches the chemical formula with the name of the compound? Select all that apply.
a. K3NK3N, potassium nitride
b. SO2SO2, sulfur dioxide
c. Cl2OCl2O, chlorine(II) oxide
d. MgOMgO, monomagnesium monoxide
e. Fe2(SO4)3Fe2(SO4)3 (iron has variable charges), iron(III) sulfate
Every chemical formula has a name. In a perfect world, this name would describe the compound's characteristics as well as its makeup.
Chemical formula that correctly matches with the name of the compound
K3N, potassium nitride
SO2, sulfur dioxide
Fe2(SO4)3, iron(III) sulfate
These names are based on a set of IUPAC standards and are referred to as systematic names. Although every chemical has a scientific name, many compounds also have popular names.
But where do the names of chemical substances come from?
Ionic compound names:
Chemical formula known as ionic compounds have ionic bonds holding the constituent ions together. These are composed of negatively charged polyatomic ions and positively charged metal cations. To be classified as an ion, they must have a positive or negative charge, though.
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Elements that have an intermediate number of valence electrons will behave more like metals if they are?
Elements that have an intermediate number of valence electrons will behave more like metals if they are lower in group .
What is metal ?
In chemical processes, metals frequently lose electrons. In chemical reactions, nonmetals pick up electrons. When they are lower in the group and higher in the group, elements with an intermediate amount of valence electrons behave more like metals and less like nonmetals, respectively. They will act as metalloids if they are in the middle.
The elements that make up the periodic table are metals, nonmetals, and metalloids. Metals tend to lose electrons in chemical reactions because they are electropositive.
Because of the weak nucleus-based attraction, lesser elements can easily lose electrons from the valence shell.
What are valence electrons ?The amount of electrons an atom must gain or lose in order to achieve the electrical configuration of the nearby noble gas or inert gas is known as valence. "Valence electrons" are described as "non-filled electrons in the outer shells."
Because they have higher energy than the electrons in inner orbits, valence electrons participate in chemical reactions. A specific element's chemical characteristics, such as its valence or valency and the ability to form bonds with other elements, can also be determined by the quantity of valence electrons that are present. It also provides us with information on the quantity of unpaired electrons, the number of atoms that can participate, and how easily the atoms can make bonds.
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discuss the relative permeability of the membrane to na and k in a resting neuron
A resting neuron is 4-5 times more permeable to potassium ions i.e K+ as there is a large number of open channels for the passage of ions.
At a normal resting period, the membrane is highly permeable to potassium ions (K+) because sodium ions are expelled out from the cells and potassium ions are forced inward the cell.
At this moment, the sodium-potassium gradient pump operates efficiently in order to exchange potassium inward and sodium outward the cell creating a potential gradient across the cell membrane. Moreover, in this case, the value of resting permeability of potassium ions is 1 as compared to sodium ions i.e. 0.4 much lower than potassium.
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Can someone check my answers please?? please it’s due today !!
George is trying to move a heavy bookshelf across the classroom. He pushes on the bookshelf with a force of 57 N to the right Friction is resisting his movement with a force of 78 N. The bookshelf does not move. A friend comes to help George. The friend pushes the bookshelf in the same direction as George with a force of 25 N. What will happen to the bookshelf?
The book shelf will move to the right with a force of 4 newton when george is trying to move a heavy bookshelf across the classroom.
What is force and how the bookshelf is calculated out to move to the right with 4 N ?Force is a newtonian quantity that is it is discovered by Newton and it represents the product of mass and acceleration.Here in this question is given George pushed the bookshelf with a force of 57 N to the right.The resistive frictional force is 78 N and the book shelf did not move.The total force would be 57 + 25 = 82 N , and then substracting it by friction force will give 82N - 78 N = 4N.So the bookshelf will move to the right with a force of 4 N .To know more about friction visit:
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if 9.65 g of nacl reacts with excesses of the other reactants and 4.11 g of nahco3 is isolated, what is the percent yield of the reaction?
The percent yield of the reaction is 28.60 %
The first step for this problem is to convert the given 10.0 grams of NaCl to moles using the molar mass of NaCl:
9.65 g of NaCl = 9.65/58.5
= 0.165 moles of NaCl
Next, we look at the balanced reaction equation and determine how many moles of NaHCO3 we could potentially make without 0.165 moles of NaCl (this is called the "theoretical yield"):
0.165 moles NaCl × 1 mol NaHCO₃/1 mol NaCl
= 0.165 moles of NaHCO₃
Next, we convert the 0.165 moles of NaHCO3 theoretical yield to grams so that we can compare this to our "actual yield" of 4.11 grams:
0.165 moles of NaHCO₃ × 84 gtrams/1 mole
= 13.86 grams of NaHCO₃
Finally, we compare our theoretical yield of 13.86 grams to our actual yield of 4.11 grams and multiply by 100 to get our percent yield:
4.11 grams / 14.37 grams × 100 = 28.60 %
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Which of the following pairs of elements would you expect to form a polar
covalent bond?
N and P
S and S
Ba and S
B and H
N and P pairs of elements would you expect to form a polar covalent bond.
What is a covalent bond ?A covalent bond is formed when two atoms exchange one or more pairs of electrons. The two nucleus are concurrently drawing these electrons to them. When the difference between both the electronegativity values of two atoms is too tiny for a transfer of electrons to actually occur to create ions, a covalent bond is formed.
How are covalent bonds represented?Covalent bonds between atoms in a Lewis structure are shown as a single line connecting the two atoms, which corresponds to the chemical symbol for the element. Diatomic molecules including hydrogen, nitrogen, fluorine, chlorine, bromine, iodine, and astatine are the principal sources of covalent bonding.
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why do organisms need to respond to their environment
I Hope this will Help You:-
Organisms need to detect and respond to changes in their internal and external environment. This is because the conditions inside our body must be carefully controlled for it to function effectively and survive. The control systems that allow organisms to respond to changes are incredibly important.
explain the difference in boiling points between water and methane in terms of intermolecular forces present
Answer: Water has a higher boiling point than methane. Water has a higher boiling point because water molecules have hydrogen bonds, which means MUCH STRONGER intermolecular forces, than methane.
Methane and water have different boiling points. Because water molecules have hydrogen bonds, which equate to much stronger intermolecular interactions than methane, water has a higher boiling point than methane.
What is the boiling point?The temperature at which a liquid's vapor pressure matches the pressure surrounding the liquid is known as the boiling point of that substance.
An O-H bond has a bigger bond dipole than a C-H bond because oxygen is more electronegative than carbon. As a result, there is a stronger force of attraction between two water molecules than between two methane molecules.
Therefore, the boiling points of water and methane are dissimilar. Water has a greater boiling point than methane because water molecules have hydrogen bonds, which translate to far stronger intermolecular interactions.
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WILL GIVE BRAINLIEST PLS HELP
Answer: I think the answer is B
Balance the equation:
H3PO4 + (NH4)2MoO4+ HNO3 = (NH4)3PO4*12MoO3 + NH4NO3 = H2O
Balance the equation :
8H₃PO₄ + 24(NH₄)₂MoO₄ + 24HNO₃ -----> 8(NH₄)₃PO₄×24MoO₃ +
24NH₄NO₃+ 24H₂O
The given reaction :
H₃PO₄ + (NH₄)₂MoO₄ + HNO₃ -----> (NH₄)₃PO₄×12MoO₃ +
NH₄NO₃+ H₂O
now sperate the reactant and product and count the no. of each element
Reactant Product
H - 4 NH₄ - 4
PO₄ - 1 PO₄ - 1
NH₄ - 2 Mo - 12
Mo - 1 O - 4
O - 4 NO₃ - 1
NO₃ - 1 H - 2
compare the coefficient ,
multiply 12 to NH₄MoO₄ We get
H₃PO₄ + 12(NH₄)₂MoO₄ + HNO₃ -----> (NH₄)₃PO₄×12MoO₃ +
NH₄NO₃+ H₂O
now, we have 24 NH₄ on the left side and 3 on right side, multiply 8 we get
H₃PO₄ + 12(NH₄)₂MoO₄ + HNO₃ -----> 8(NH₄)₃PO₄×12MoO₃ +
NH₄NO₃+ H₂O
now look at PO₄ , we have 1 on left side and 8 on right side , multiply 8 in H₃PO₄, and compare coefficient, we get
8H₃PO₄ + 24(NH₄)₂MoO₄ + 24HNO₃ -----> 8(NH₄)₃PO₄×12MoO₃ +
24NH₄NO₃+ 24H₂O
now compare the coefficient , the equation is now balance
Thus, Balance the equation :
8H₃PO₄ + 24(NH₄)₂MoO₄ + 24HNO₃ -----> 8(NH₄)₃PO₄×24MoO₃ +
24NH₄NO₃+ 24H₂O
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which compounds could be represented by the empirical formula c h 2 ?
The compounds that can be represented by the empirical formula CH2 are C2H4, C3H6, and C8H16.
The empirical formula gives the smallest ratio of the total number of atoms present in a compound. It simply gives a ratio of the number of atoms that are present in a compound.
The formula that relates empirical formula with molecular formula is:
Molecular Formula = n × Empirical Formula
Where n is any integer.
Thus CH2 is the simplest ratio of C2H4, C3H6, and C8H16 and CH2 is the empirical formula of these compounds.
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A sample of gas occupies a volume of 450.0 mL at 740 mm Hg and 16°C. Determine the volume of this
sample at 760 mm Hg and 37°C.
The volume of this sample at 760 mm Hg and 37°C is 474.92 mL.
How to calculate volume?We know that,
PV = nRT, the fundamental law of ideal gas.
Where P is the gas's pressure in atmospheres.
The gas's volume in L is denoted by V.
n is the number of moles of the gas in a mole.
The general gas constant is R.
The gas's temperature is T in Kelvins.
If n is constant and (P, V, and T) have two different values:
P1V1T2 = P2V2T1
P1 is 740 mmHg, V1 is 450 mL, and T1 is 16 °C plus 273 K.
P2 equals 760 mmHg, V2 is??? mL, and T2 is 37 °C plus 273 K, or 310 K.
V2 = P1V1T2/P2T1 = (740 mmHg), 450 mL, 310 K), and 760 mmHg, 286 K) = 474.92 mL, respectively.
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IM GIVING BRAINLEST!
What is the name of Pb(NO3 ) 2 Explain how you determined the bond type and the steps you used to determine the naming convention for the compound
Name of Pb(NO3 )2 is Lead(II) nitrate.
Pb(NO3)2 is ionic as well as covalent
Pb is the symbol of lead and NO3 is a complex ion called nitrate. It has one nitrogen and three oxygens. Pb(NO3)2 is ionic as well as covalent. NO3 is covalent in nature because both nitrogen and oxygen are non-metals and therefore an ionic bond cannot be formed between them.
Ionic compounds are formed when a metal reacts with a nonmetal whereas covalent compounds are formed when two non -metals react with each other. Binary compounds containing hydrogen are usually covalent compounds as hydrogen is a non - metal.
An ionic bond donates an electron to the other atom in the bond whereas electrons in a covalent bond are shared equally between the atoms.
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how would you prepare from the stock solution of 0.5 m cuso4, 5 ml of 0.1m, 0.2m, 0.3m, and 0.4m, and 0.5m cuso4? show your calculations in your submission.
We will prepare the stock solution of 0.5 m CuSO₄ by using the formulae M1V1 = M2V2
1. Prepare 5 ml of 0.1 m
Use the formulae M1V1 = M2V2
Where M1 = 0.5 m
M2 = 0.1 m
V2 = 5 ml
V1 = ?
Put the values
0.5 × V1 = 0.1 × 5
V1 = 0.5 / 0.5
V1 = 1 ml
1 ml of 0.5 m CuSO₄ solution is diluted up to 5 ml to get 0.1 m CuSO₄ solution
1. Prepare 5 ml of 0.1 m
Use the formulae M1V1 = M2V2
Where M1 = 0.5 m
M2 = 0.1 m
V2 = 5 ml
V1 = ?
Put the values
0.5 × V1 = 0.1 × 5
V1 = 0.5 / 0.5
V1 = 1 ml
1 ml of 0.5 m CuSO₄ solution is diluted up to 5 ml to get 0.1 m CuSO₄ solution
2. Prepare 5 ml of 0.2 m
Use the formulae M1V1 = M2V2
Where M1 = 0.5 m
M2 = 0.2 m
V2 = 5 ml
V1 = ?
Put the values
0.5 × V1 = 0.2 × 5
V1 = 1 / 0.5
V1 = 2 ml
2 ml of 0.5 m CuSO₄ solution is diluted up to 5 ml to get 0.2 m CuSO₄ solution
3. Prepare 5 ml of 0.3 m
Use the formulae M1V1 = M2V2
Where M1 = 0.5 m
M2 = 0.3 m
V2 = 5 ml
V1 = ?
Put the values
0.5 × V1 = 0.3 × 5
V1 = 1.5 / 0.5
V1 = 3 ml
3 ml of 0.5 m CuSO₄ solution is diluted up to 5 ml to get 0.3 m CuSO₄ solution
4. Prepare 5 ml of 0.4 m
Use the formulae M1V1 = M2V2
Where M1 = 0.5 m
M2 = 0.4 m
V2 = 5 ml
V1 = ?
Put the values
0.5 × V1 = 0.4 × 5
V1 = 2 / 0.5
V1 = 4 ml
4 ml of 0.5 m CuSO₄ solution is diluted up to 5 ml to get 0.4 m CuSO₄ solution
5. Prepare 5 ml of 0.5 m
The stock solution is already a 0.5 m solution so no need for any addition.
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If your job is to test the amount of lead found in paint samples, what area of chemistry would have you studied
If your job is to test the amount of lead found in paint samples, then you should be specialized in Analytical Chemistry.
Analytical Chemistry is a branch of Chemistry and is a stream of Science that deals with the identification and quantification of various chemical substances in a mixture.
Sometimes the work of the chemists in the field may be related to inventing a new method for testing and identification of a certain chemical or element from a mixture. Their role is usually to perform analysis and interpret a lot by performing the analysis.
It also involves quantitative analysis for determining the numerical amount and concentration of various chemical substances.
So, if you wish to test the amount of lead found in paint samples, you need to focus on Analytical chemistry.
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A piece of barium has a volume of
4.00 cm3. The density of barium
is 3.62 g/cm3. What is the mass
of the sample of barium?
These three variables have a common equation:
[tex]D=\dfrac{m}{V}[/tex]
Solving the Question:We're given:
V = 4.00 cm³D = 3.62 g/cm³Isolate m in the equation:
[tex]m=DV[/tex]
Plug these values into the equation:
[tex]m=(3.62\frac{g}{cm^3})(4.00 cm^{3})\\\\m=14.48g[/tex]
AnswerThe mass of the sample of barium is 14.48 g.
I need help with this science question
Answer:
c Draw Ernest Rutherford atomic model
Explanation:
which properties of a system would determine whether vacancy or interstitial diffusion is more likely?
The size of the particles decides whether vacancy or interstitial diffusion is more likely.
In vacancy diffusion, the atoms moves in a particular direction and the vacancies are filled and new vacancies are created on the places of the atoms.
While in Interstitial diffusion, the atoms moves inside the lattice of the structure of the crystals.
Interstitial diffusion is faster than vacancy diffusion because it is easier to move inside the lattice, and if the size of the atom is small, it will prefer interstitial diffusion over vacancy diffusion. So, smaller the size of the atoms, faster is the rate of interstitial diffusion.
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Which statement correctly describes photons? (Will give brainliest)
A. Photons behave like waves but not particles.
B. Photons behave like particles but not waves.
C. Photons are particles of light without a wavelength.
D. Photons are particles of light and have a wavelength.
Answer: Its D
Photons are particles of light and have a wavelength.
Explanation:
i did the quiz
Photons are the particles of light which have a particular wavelength and frequency. Photons are the units of light which contain energy. Thus, the correct option is D.
What are photons?
A photon is a tiny particle which comprises of the waves of electromagnetic radiation. As explained by Maxwell, photons are just electric fields which travels through the space. Photons have no net charge, no resting mass, and can travel at the speed of light.
Photons are the packets of light energy (quantum). These are required for the process of photosynthesis in plants. Plants capture the light energy and convert it into chemical energy which is useable by living organisms.
Therefore, the correct option is D.
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