Answer:
When rubbing a balloon with a wool cloth, it puts negative charges on the balloon. Negative charges attract to positive charges. ... When both balloons are rubbed with the wool cloth, the both receive negative charges, so they will repel each other.
How many molecules of glucose are in 1.15 mol of glucose, C6H1206?
Answer: There are [tex]6.926\times 10^{23}[/tex] molecules of glucose.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the molecules, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given molecules}}{\text {Avogadro's number}}[/tex]
[tex]1.15=\frac{x}{6.023\times 10^{23}}[/tex]
[tex]x=1.15\times 6.023\times 10^{23}=6.926\times 10^{23}[/tex]
Thus there are [tex]6.926\times 10^{23}[/tex] molecules of glucose.
Which process is used to separate soluble compounds from insoluble compounds?
Select one:
a. Sublimation
b. Extraction
c. Decantation
Answer:
the answer is b extraction
Answer: Decantation
Explanation:
Decantation is a method used to separate mixtures of immiscible liquids or soluble compounds from insoluble compounds.
The procedure follows that the solids are mixed together and water is added. The soluble solid dissolves and the insoluble solid settles at the bottom of the flask. Now the soluble solid is poured out gently leaving the insoluble solid behind using a glass rod.
The disadvantage of Decantation is that it does not perfectly separate the mixture and Filtration is often a preferred method to separate soluble compounds from insoluble compoundsSee related answer here: https://brainly.com/question/14482995
Infer: Naos is a star in the Argos constellation. It has a very deep blue color. What do you think is the approximate temperature of Naos?
Answer:
Being an extreme blue supergiant with 59 solar masses and a surface temperature of over 42000 kelvins, Naos is actually one of the brightest stars in the Milky Way. It's almost 800 000 times as bright as the Sun, although most of that light is ultraviolet.
Explanation:
Wien's displacement law to find the approximate temperature of a star, in this case the Naos temperature would be 64000K, the real temperature is 42000K
Wien's displacement law states that the product of the maximum wavelength emitted by a black body and its temperature is constant
λ_{max} T = 2,898 10⁻³ [ m K]
A black body is a body that absorbs all the radiation that reaches it, which is why it looks black, the cavity inside the black body must be at a fixed mask and it was there so that a thermal equilibrium is established and the radiation can be emitted by the black hole.
The stars approach a black body in the sense that their mission has a similar maximum to that of the black holes, but the temperature is an effective temperature that does not take into account the different processes within the star.
With this wavelength of the emission maximum, the temperature of the stars is calculated, in this case the star Naos is a whitish-blue star, the surface temperature found in tables is 42000K
if we use Wien's displacement law the emission should be
λ_{max} = 2,898 10-3 / T
λ_{max} = 2,898 10-3 / 42000
λ_{max} = 690 nm
this emission corresponds to the color orange
For a blue emission ranging from 450 nm to 500 nm, the temperature of a black body would be
T = 64000K to 57000 K
therefore using wien's displament law the temperature of the star Naos should be approximately 64000k, the fact that the real temperature is lower is because there are several processes with different temperatures inside the star.
In conclusion, Wien's Displacement Law can be used to find the approximate temperature of a star, in this case the Naos Temperature would be 64000K
Learn more about the temperature of the stars here:
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which temperature do they need to perform the experiment for perovskite to conduct electric current?
A: T=1980°C
B: T>1980°
C: T>_ 1980°C
D:T< 1980°C
For C it's suppose to be an less than equal sign .
Answer:
Correct answer is D : T < 1980°C
Explanation:
Correct answer is D:T< 1980°C
Perovskite proton conductors belong to the class of high temperature proton conductors (HTPCs) , solid that conduct electricity by transporting H⁺ ions (protons ) at temperatures above ambient , typically 400 - 1000°C
So, we get T < 1980°C
How many grams of P2O5 are formed from 3.4 moles of O2? SHOW the math below
Answer:
I will do it again soon to open the door to my house with a new year sa imo lang mam kay I have a great time to go to work for the last time
The mass of the P₂O₅ formed from 3.4 moles of O₂ gas is equal to 386.1 g.
What is a mole?A mole can be described as a unit for measurement of a huge number of quantities of atoms, molecules, ions, or other particles. The atomic mass can be expressed as the one mole of any element.
The number of particles present in one mole was to be equal to 6.023 × 10 ²³ which is Avogadro’s constant.
Given, the number of moles of O₂ gas = 3.4 moles
The balanced chemical reaction of phosphorous and oxygen gas can be given as:
4 P + 5 O₂ → 2 P₂O₅
5 mol of Oxygen reacts with moles of P₂O₅ = 2 mol
3.4 mol of O₂ gas reacts with moles of P₂O₅ = (2/5) × 3.4 = 1.36 mol
The mass of the 1.36 mol of P₂O₅ = 1.36 × 283.89 = 386.1 g
Learn more about the mole, here:
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whats a Natural Selection?
Answer:
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
Explanation:
I hope this helps :) Thank you. Plz mark brainliest.
What is the molecular formula for hydrogen peroxide?
What provides the source of energy for the water cycle?
rain
soil
the Sun
the Moon
The formation of tert-butanol is described by the following chemical equation: Suppose a two-step mechanism is proposed for this reaction, beginning with this elementary reaction: Suppose also that the second step of the mechanism should be bimolecular. Suggest a reasonable second step. That is, write the balanced chemical equation of a bimolecular elementary reaction that would complete the proposed mechanism.
Answer:
(CH3)3C^+ + OH^- --------> (CH3)3COH
Explanation:
This reaction has to do with SN1 reaction of alkyl halides. Here tert-butanol is formed from tert-butyl bromide.
The first step in the reaction is the formation of a carbocation. This is a unimolecular reaction. The rate of reaction depends on the concentration of the alkyl halide. This is a slow step and thus the rate determining step in the mechanism.
(CH3)3CBr -------> (CH3)3C^+ + Br^-
The second step is a fast step and it completes the reaction mechanism. It is a bimolecular reaction as follows;
(CH3)3C^+ + OH^- --------> (CH3)3COH
Is a bowling ball made of matter?
Answer:
Yes a bowling ball made of matter.
Explanation:
What type of tide would this arrangement of earth-moon-sun create?*
O full moon tide
O neap tide
O new moon tide
Ospring tide
HURRY!!!
Answer:
neap tide
Explanation:
There are two different types of tides, which are the spring tide and the neap tide.
Neap tides are weak tides which occur when the gravitational forces of the sun and the moon are at right angles to each other with respect to the earth. Since the sun and moon are at right angles, it causes a difference between the low and high tide.
The spring tide are strong tides which occur when the moon, sun and earth are in straight line. The spring tide occur during full moon and new moon.
Answer:
Neap Tides
The result is a neap tide. The same effect happens during third quarter. These occur during first and last quarter moons. The gravitational pull is not as strong.
Explanation:
the first answer is correct
somebody please explain how to determine the relative abundance of isotopes.im having trouble understaning the rule :)
Answer:
isotopes have the SAME number of protonsbut DIFFERENT number of neutrons . to find out the neutrons you need to subtract atomic number from the mass "m-a=n"
Write the net ionic equation for the precipitation of calcium sulfide from aqueous solution
Answer:
Answer is Ca2+(aq)+S2-(aq)=>CaS(s)
Explanation:
I hope it's helpful!
The net ionic equation for the precipitation of calcium sulfide in solution is; Ca^2+(aq) + S^2-(aq) -------> CaS(s)
Let me give a typical instance since your question is incomplete. Imagine an aqueous solution of H2S and CaCl2 from which calcium sulfide does precipitate.
The molecular reaction equation is;
H2S(aq) + CaCl2(aq) -------> CaS(s) + 2HCl(aq)
The complete ionic equation is;
2H^+(aq) + S^2-(aq) + Ca^2+(aq) + 2Cl^-(aq) -------> CaS(s) + 2H^+(aq) + 2Cl^-(aq)
The net ionic equation is;
Ca^2+(aq) + S^2-(aq) -------> CaS(s)
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A certain chemical reaction releases of heat energy per mole of reactant consumed. Suppose some moles of the reactant are put into a calorimeter (a device for measuring heat flow). It takes of heat energy to raise the temperature of this calorimeter by . Now the reaction is run until all the reactant is gone, and the temperature of the calorimeter is found to rise by . How would you calculate the number of moles of reactant that were consumed?
Set the math up. But don't do any of it. Just leave your answer as a math expression.
Also, be sure your answer includes all the correct unit symbols.
Answer:
The expression to calculate the number of moles reactants is:
n = 59.714 J / 368000 J/mole
Explanation:
Note: The question is missing some parts. The complete question is as follows:
A certain chemical reaction releases 368.kJ of heat energy per mole of reactant consumed. Suppose some moles of the reactant are put into a calorimeter (a device for measuring heat flow). It takes 4.09J of heat energy to raise the temperature of this calorimeter by 1°C. Now the reaction is run until all the reactant is gone, and the temperature of the calorimeter is found to rise by 14.6°C. How would you calculate the number of moles of reactant that were consumed?
Set the math up. But don't do any of it. Just leave your answer as a math expression.
Also, be sure your answer includes all the correct unit symbols.
Step 1: Determine the quantity of heat required to raise the temperature of the calorimeter by 14.6°C
Quantity of heat required to raise the temperature of the calorimeter by 1°C = 4.09 J
Quantity of heat required to raise the temperature of the calorimeter by 14.6°C = 4.09 * 14.6 = 59.714 J
Step 2: Express the quantity of heat released per mole of reactant in J/mole
368 kJ/mole = 368 kJ/mole * 1000 J/kJ = 368000 J/mole
Step 3: Express the moles of reactant as n and equate it to the energy absorbed by the calorimeter
Let the number of moles of reactant be n
Assuming that there is no heat lost to the surrounding, from the law of conservation of energy, Heat released = Heat absorbed
Heat released = number of moles of reactant * quantity of heat released per mole of reactant
Heat released = n * 368000 J/mole
Heat absorbed by calorimeter = 59.714 J
From the relation above, n * 368000 J/mole = 59.714 J
n = 59.714 J / 368000 J/mole
Therefore, the expression to calculate the number of moles is n = 59.714 J / 368000 J/mole
Mr. Smith creates a new sauce because he wants to increase his restaurant’s sales by creating a burger that reduces gas production. He recruits 100 customers with a history of gas problems. He has 50 of them eat burgers with the new sauce. The other 50 eat burgers with sauce that looks just like the new sauce, but it is really just a mixture of mayonnaise and food coloring. Both groups were told that they were getting the new sauce. Mr. Smith has all of the participants track their production of gas for 24 hours. Mr. Smith finds that customers who ate the new sauce had less gas production for 24 hours.
what do you expect me to say on brainly can I text you the answer on ig ?
Explanation: so that I can give you a full answer
Calculate the molarity of 0.300 mol of Na2S in 1.75 L of solution.
Calculate the molarity of 31.3 g of MgS in 955 mL of solution
Answer:
Molarity[Na2S] = 0.1714
Molarity[Mgs] = 0.5811
Explanation:
Given:
0.300 mol [Na2S in 1.75 L]
31.3 g [MgS in 955 mL]
Find:
Molarity
Computation:
Molarity = Number of mole / volume in liter
Molarity[Na2S] = 0.300 / 1.75
Molarity[Na2S] = 0.1714
Molar mass of Mgs = 56.38 g/mol
Number of mole = 31.3 / 56.38
Number of mole = 0.555
Molarity[Mgs] = Number of mole / volume in liter
Molarity[Mgs] = [0.555 / 955]1000
Molarity[Mgs] = 0.5811
There are four conditions an atom needs to meet to participate in hydrogen bonding. It needs to be_______ enough not to bump into other atoms when approaching the 1s orbital of the hydrogen, it needs to carry at least one________ atom, it needs to be_________enough to create a delta on the connected hydrogen, and it needs to have at least one________.
Answer:
The conditions are
1) Small enough
2) Electronegative atom
3) highly electronegative
4) lone pair of electrons
The correct statement therefore is
It needs to be small enough not to bump into other atoms when approaching the 1s orbital of the hydrogen, it needs to carry at least one electronegative atom, it needs to be highly electronegative enough to create a delta on the connected hydrogen, and it needs to have at least one lone pair of electrons.
Explanation:
Hydrogen bonding is a type of intermolecular bond that occurs between the partial positive charge (delta) on a hydrogen atom bonded to a small highly electronegative element (like nitrogen, oxygen or fluorine) and the free electrons on another electronegative element of another molecule.
The hydrogen atom with the partial positive charge (delta) is known as the hydrogen bond donor, while the electronegative element, carrying lone electrons is called the hydrogen bond acceptor.
Let's take a deeper look at these terms:
1) Hydrogen bond donor
Using water (H₂O) as an example, the high electronegativity of the oxygen atom covalently bonded to the hydrogen atom draws the lone electron in the 1s orbital of the hydrogen atom, creating a partial positive charge (d⁺) on the hydrogen atom. This is what happens within one water molecule
2) Hydrogen bond acceptor
When two or more molecules of water interact, the partial positive charge (d⁺) on the hydrogen atom of one molecule, is attracted to the valence or free electrons on the oxygen atom of a nearby molecule of water thus creating a dipole-dipole intermolecular bond known as a hydrogen bond.
For the hydrogen bond to be effective, the electronegative atom bonded to the hydrogen acting as the hydrogen bond donor in the first water molecule needs to be small enough so as not to disrupt the 1s orbital of the hydrogen atom. The smaller the size of the electronegative atom, the stronger the partial negative charge created on the hydrogen atom.
The valence or free pair of electrons on the electronegative (oxygen) atom of the second molecule of water (hydrogen bond acceptor) is what attracts the partial positive charge on the hydrogen atom to create the hydrogen bond
How are you finding the moles of the unknown substance when you are only given the grams of the unknown molecular compound?
Answer:
Determine the moles of unknown (the solute) from the molality of the solution and the mass of solvent (in kilograms) used to make the solution. Determine the molar mass from the mass of the unknown and the number of moles of unknown.
If 3.53 g of CuNO, is dissolved in water to make a 0.330 M solution, what is the volume of the solution in milliliters?
Answer:
84.8 mL
Explanation:
From the question given above, the following data were obtained:
Mass of CuNO₃ = 3.53 g
Molarity of CuNO₃ = 0.330 M
Volume of solution =?
Next, we shall determine the number of mole in 3.53 g of CuNO₃. This can be obtained as follow:
Mass of CuNO₃ = 3.53 g
Molar mass of CuNO₃ = 63.5 + 14 + (16×3)
= 63.5 + 14 + 48
= 125.5 g/mol
Mole of CuNO₃ =?
Mole = mass / Molar mass
Mole of CuNO₃ = 3.53 / 125.5
Mole of CuNO₃ = 0.028 moles
Next, we shall determine the volume of the solution. This can be obtained as follow:
Molarity of CuNO₃ = 0.330 M
Mole of CuNO₃ = 0.028 moles
Volume of solution =?
Molarity = mole /Volume
0.330 = 0.028 / Volume
Cross multiply
0.330 × Volume = 0.028
Divide both side by 0.330
Volume = 0.028 / 0.330
Volume = 0.0848 L
Finally, we shall convert 0.0848 L to millilitres (mL). This can be obtained as follow:
1 L = 1000 mL
Therefore,
0.0848 L = 0.0848 L × 1000 mL / 1 L
0.0848 L = 84.8 mL
Therefore, the volume of the solution is 84.8 mL.
4. How many grams are there in 7.5 x 1027 formula units of Sr(OH)2?
5. How many grams are there in 9.30 x 1026 molecules of H2SO4?
PLEASE ANSWER I WILL MARK YOU BRAINLIEST
Answer:
4) 1.52 × 10^6 g
5) 1.51 × 10^5 g
Explanation:
4. There are 121.63 g/mol of Sr(OH)₂, and there are 6.02214·10^23 formula units per mol. Then the number of grams is ...
(7.5×10^27 formula units) × (121.63 g)/(6.02214×10^23 formula units)
= 7.5×121.63/6.02214 × 10^4 g
≈ 1.52 × 10^6 g
__
5. H₂SO₄ has a molar mass of about 98.079 g, so the given quantity has a mass of about ...
(9.30×10^26 formula units)(98.079 g)/(6.02214×10^23 formula units)
= 9.30×98.079/6.02214 × 10^3 g
≈ 1.51 × 10^5 g
Answer:
4. 1.52×10^6 g
5. 1.51×10^5 g
Explanation:
hope it helps
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How are the smallest ocean waves produced?
Answer:
The moon is not pulling the tide as hard
Explanation:
I suppose, I know it dills with the moon though
Explanation:
Normalmente, las olas se forman por el viento aunque su historia comienza muy lejos, en el Sol. ... Cuando el viento sopla sobre el mar, las partículas de aire rozan a las partículas de agua y se empiezan a formar pequeñas olas de pocos milímetros de longitud, llamadas ondas capilares.
Normally, waves are formed by the wind, although their history begins very far away, in the Sun. ... When the wind blows over the sea, the air particles brush against the water particles and small waves of few millimeters in length, called capillary waves.
Which molecule has a high specific heat?
a) C2H6
b) C2H6O
c) H2O
What mass (g) of magnesium nitride (Mg3N2) can be made from the reaction of 1.22 g of magnesium with excess nitrogen? __Mg + __N2__Mg3N2
a. 1.69 b. 15.2
c. 5.07 d. 5.02 e. 3.38
I’ll give brainest
1.69 g Mg₃N₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisReactions RxNExplanation:Step 1: Define
[RxN - Unbalanced] Mg + N₂ → Mg₃N₂
[RxN - Balanced] 3Mg + N₂ → Mg₃N₂
[Given] 1.22 g Mg
[Solve] grams Mg₃N₂
Step 2: Identify Conversions
[RxN] 3 mol Mg → Mg₃N₂
[PT] Molar Mass of Mg - 24.31 g/mol
[PT] Molar Mass of N - 14.01 g/mol
Molar Mass of Mg₃N₂ - 3(24.31) + 2(14.01) = 100.95 g/mol
Step 3: Stoich
[DA] Set up: [tex]\displaystyle 1.22 \ g \ Mg(\frac{1 \ mol \ Mg}{24.31 \ g \ Mg})(\frac{1 \ mol \ Mg_3N_2}{3 \ mol \ Mg})(\frac{100.95 \ g \ Mg_3N_2}{1 \ mol\ Mg_3N_2})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 1.68873 \ g \ Mg_3N_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.68873 g Mg₃N₂ ≈ 1.69 g Mg₃N₂
The following pieces of evidence were found at separate explosion sites. For each item, indicate whether the explosion was more likely caused by low or high explosive, and explain your answer.
a. Lead azide residues
b. Nitrocellulose residues
c. Ammonium nitrate residues
d. Scraps of primacord
e. Potassium chlorate residues
Explanation:
The major difference between low and high explosives is the rate of detonation. Low explosives detonate very slowly (less than 1,000 meters per second), whereas high explosives detonate very quickly (from 1,000 to 8,500 meters per second).
High explosives among the given list are Lead azide residues, Ammonium nitrate residues, and Scraps of primacord. Whereas Nitrocellulose residues and, Potassium chlorate residues are low explosives.
How are acids and alkalis
similar?
Answer:h
Explanation:
Answer:
Acids and alkalis both contain ions. Acids contain lots of hydrogen ions, which have the symbol H+. Alkalis contain lots of hydroxide ions, symbol OH-. Water is neutral because the number of hydrogen ions is equal to the number of hydroxide ions.
What is the molar mass of KOH?
56.11 g/mol
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableExplanation:Step 1: Define
[Compound] KOH
Step 2: Identify
[PT] Molar Mass of K - 39.10 g/mol
[PT] Molar Mass of O - 16.00 g/mol
[PT] Molar Mass of H - 1.01 g/mol
Step 3: Find
39.10 + 16.00 + 1.01 = 56.11 g/mol
describe how zinc oxide is made from zinc sulfide
Convert −319 ∘F to kelvins.
Answer:
it is 78.15 Kelvins
Explanation:
-319 Fahrenheit to 78.15 Kelvins
1.
Draw the Dot Structure for Na!
Answer:
Na ·
Explanation:
Hello!
In this case, since the Lewis dot structure of any element illustrates the number of valence electrons at the outer shell; we can set up the electron configuration of sodium to obtain:
[tex]Na^1^1\rightarrow 1s^2,2s^2,2p^6,3s^1[/tex]
We can see there is only one valence electron, for that reason the Lewis dot structure is:
Na ·
Whereas the dot represents the valence electron.
Best regards!
Which process is not a state of matter change
A.melting
B.freezing
C.stirring
D.evaporation
Answer:
C. sterling hope it helps