Option A is correct which says when a liquid changes into a solid, the molecular motion decreases.
What is molecular motion?
The movement of its component atoms or molecules in a certain direction is referred to as molecular motion.
There is a decrease in the molecular motion when liquid moves towards a solid state. This is because the kinetic energy of the molecules decreases as molecules are moving from a less uniform space to a more uniform phase. As a result, molecular motion decreases.
Hence, option A is correct
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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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Can someone check my answers please?? please it’s due today !!
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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the hydrologic cycle is the movement of ____. group of answer choices carbon carbohydrates water hydrocarbons hydrogen
The hydrologic cycle is the movement of water.
Water can recycle itself in the water cycle which is called the hydrologic cycle.
This cycle can be considered to start from the evaporation of water from the ocean's surface, making the air moist. As this moist air is lifted it cools and the water vapor condenses. It then forms clouds; in fact, clouds are made from tiny water droplets and ice crystals that are so small that they can float in the air.
The moisture in the atmosphere can also be transported around the globe until it returns to the surface as precipitation. Precipitation may take the form of rain, snow, sleet, or hail. Once the water reaches the ground, water may evaporate back into the atmosphere, or the water may penetrate the surface and become groundwater.
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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
I need help with this science question
Answer:
c Draw Ernest Rutherford atomic model
Explanation:
If a measurement is 23.895 m, which digit is the uncertain number?
2
8
9
5
Answer:
5 is the uncertain number
n is known as the principal quantum number. ... l is known as the orbital quantum number. ... ml is known as the magnetic quantum number. ... n specifies l specifies ml specifies ... a. the subshell - orbital shape. b. the energy and distance from the nucleus. c. the orbital orientation.
The first shell of an atom is its electron shell, or energy level.
The subshell is the second shell.
The particular orbital (or "cloud") within that subshell is the third shell.
What are Quantum Numbers?The position and energy of an electron in an atom are represented by a set of numbers known as quantum numbers.
principal quantum number
azimuthal quantum number
magnetic quantum number
The electron shell, also known as the atom's energy level, is the initial shell. The value of N ranges from 1 to the atom's outermost electron's shell.
By using the connection, the second shell, which is the subshell, determines the magnitude of the orbital angular momentum.
The third shell creates the orbital angular projection momentum along a certain axis and is the particular orbital (or "cloud") within that subshell.
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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.
How many moles are in 35 grams of NaCl
The 0.59 moles of NaCl are present in 35grams of NaCl.
What do you understand by moles?
Chemists employ the mole, as a very significant unit of measurement.
Given:
The given mass of NaCl = 35 gram
The molar mass of NaCl = 58.44 g/mol
By applying the mole's formula = moles = Given mass/molar mass
Moles = 35/58.44 = 0.59 moles
Hence, the answer is 0.59 moles of NaCl
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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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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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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 of the following examples is a way to live sustainably?
Responses
Drive your car as much as possible.
Have a nice green, fertilized lawn.
Recycle and reuse materials.
Leave computer screens and light bulbs on.
The example 'recycle and reuse materials' is a way to live sustainability because it involves the use of old materials instead of obtaining new ones (Option 3).
What is recycling?The expression recycling is used to denote the reuse of material with different purposes, which involve the absence of extraction techniques that may be harmful to the environment and therefore promote sustainability.
Therefore, with this data, we can see that recycling is an excellent manner to maintain the sustainability objective in order to reduce the need to obtain more and more material from nature.
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How did fossil fuels get there name
Answer:
Explanation:
Fossil fuels got their name because they are made from dead organisms, mostly plants that didn't decay because they were squashed under water or mud with no oxygen.
At the equivalence point of a strong acid-strong base titration, all of the acid and base have reacted producing water and a salt. What affects the ph at this point in the titration?.
The self-auto ionization affects the pH at the titration and is greater than 7
Strong acid and strong base completely suppress the effect of each other upon arriving at the equivalence point. The salt of strong acid and strong base neither gets hydrolyzed to furnish any mother acid or base because in this case, the acid-base equilibrium strongly favors the product. So, neither cation nor anion influences the pH of the neutralization point, and thus, it is only governed by the self-ionization of water. So, the correct option is the auto-ionization of water.It produced an alkaline that is susceptible and the pH of the equivalence factor will be higher than 7.Therefore the solution generated is just marginally alkaline, therefore the equivalence point's pH will be higher than 7.To learn more about equivalence point visit:
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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 $C{{O}_{2}}$.
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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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
Which quantity must be determined experimentally in order to determine the bonding atomic radius of an atom?.
Only by measuring the separation between the nuclei of two contacting atoms and halving that distance can one determine the radius of an atom. The illustrations show how the environment around an atom can cause it to have a varied radius, even if it is the same atom.
How can the atomic size of an element be determined?By measuring the distance between the two atoms after two are united, we may determine the atomic size of the new molecule. The third technique for determining an element's atomic size is to create a single covalent link between two atoms and measure the space between them.
Atomic radii in the periodic table change from left to right across a row and from top to bottom along a column. Because of these two patterns, the periodic table's bottom left corner contains the biggest atoms, while the upper right corner has the smallest.
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13. Practice: You and your brother are pushing a car with a dead battery with forces of 20 N and 25 N in the
same direction. What is the net force applied on the car?
Show your work:
Solution:
You and your brother are pushing a car with a dead battery with forces of 20 N and 25 N in the same direction and the net force is 45N.
Net force = 20 N + 25 N
Net force = 45 N.
What is force?Force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. The SI unit of force is Newton(N).
The Force has different effects:
Force can make a body that is at rest to move.It can stop a moving body or slow it down.It can accelerate the speed of a moving body.It can also change the direction of a moving body along with its shape and size.To learn more about force, refer;
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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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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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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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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 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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The energy that is released in the hydrogen fusion reaction comes from __________.
Jam in a jar has a mass of 91grams and a volume of 65cubic centimeters. Calculate its density. Write your answer to the tenths place. gramspercubic centimeter
Taking into account the definition of density, the density of the jam in the jar is 1.4 g/cm³.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Density of jamIn this case, you know that:
Mass= 91 gVolume= 65 cm³Replacing in the definition of density:
density= 91 g÷ 65 cm³
Solving:
density= 1.4 g/cm³
In summary, the density is 1.4 g/cm³.
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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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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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