Answer:
4.03 × 10²² particles of beryllium sulfide.
Explanation:
The formula to find the number of particles is:
Number of particles/atoms = number of moles × (6.02 × 10²³)
6.02 × 10²³ = Avogadro's number
But first, we will have to find the number of moles. This can be found using the formula:
Number of moles = mass ÷ Mr
Mr of BeS = 9 + 32.1 = 41.1
Number of moles = 2.74 ÷ 41.1 = 0.067 mol
Now that we know the number of moles, we can find the number of particles.
Number of particles = 0.067 × 6.02 × 10²³
∴ Number of particles = 4.03 × 10²²
Answer:
4.03 × 10²² particles
Explanation:
Had the same question and got it correct.
How many grams of SO2 would you need to dissolve in 100g of 40 degree water to make a saturated solution?
If you heated the solution to 90 degrees would the new solution be unsaturated, or supersaturated?
The grams of SO₂ that would be dissolved in 100 g of 40 degree water to make a saturated solution can be calculated by making solubility curve.
What is mass?Mass is the quantity of matter of a physical body.
If you want to calculate the mass of Sulfur dioxide in 100 g of 40 degree, you have to make a solution curve.
With the increase in temperature, the solubility increases as well
Thus, the grams of SO₂ that would be dissolved in 100 g of 40 degree water to make a saturated solution can be calculated by making a solubility curve.
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can you guys please help me on these 2 questions im stuck
Answer:
O2 is limiting reactant
Explanation:
4 x Al = 107.924 gm
6 x O = 95.994 gm
you need ALMOST as many grams of O2 as Aluminum....
you are short of O2 <======the limiting reactant
One atomic mass unit ( 1 amu)
is equal to the mass of a carbon-12 atom multiplied by the quantity
Answer: 1/12
Explanation:
A carbon-12 atom has a mass of 12 amu, so multiplying this by 1/12, we get 1 amu.
Calculate the molarity of an HCl solution if 23.88 mL of it reacts with 6.5287 grams of sodium carbonate (106 g/mol) according to
2HCl + Na2CO3 → 2NaCl + H2O + CO2 Answer in units of mol/L.
I NEED HELP
Answer:
5.158 mol/L
Explanation:
To find the molarity, you need to use the formula:
Molarity (M) = moles / volume (L)
You have been grams sodium carbonate. You need to (1) convert grams Na₂CO₃ to moles (via molar mass), then (2) convert moles Na₂CO₃ to moles HCl (via mole-to-mole ratio from equation), then (3) convert mL to L (by dividing by 1,000), and then (4) use the molarity equation.
Steps 1 - 2:
2 HCl + 1 Na₂CO₃ ----> 2 NaCl + H₂O + CO₂
6.5287 g Na₂CO₃ 1 mole 2 moles HCl
-------------------------- x ------------- x ------------------------- = 0.12318 mole HCl
106 g 1 mole Na₂CO₃
Step 3:
23.88 mL / 1,000 = 0.02388 L
Step 4:
Molarity = moles / volume
Molarity = 0.12318 mole / 0.02388 L
Molarity = 5.158 mole/L
**mole/L is equal to M**
which of the following is not balanced equation
Answer: (2)
Explanation:
There are 16 oxygen atoms on the reactant side but only 10 on the products side.
Assume that your electrical power company gets its energy from a hydroelectric dam. Outline all of the energy changes that occurred from the falling water that turned the generators at the dam to the hot air that was produced from your hair dryer this morning.
Kinetic energy in different forms occurred from the falling water that turned the generators at the dam to the hot air that was produced from your hair dryer this morning.
What is Kinetic energy ?Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
Kinetic energy (water) to electric energy (dam) as the hydroelectric dam works.
Then, as the current travels from the plant to your crib, electric energy to heat energy (wire resistance).
Then, when you are using the dryer electric energy to heat energy (hot air) and sound energy (air particles vibrate due to the heat energy).
Therefore, Kinetic energy in different forms occurred from the falling water that turned the generators at the dam to the hot air that was produced from your hair dryer this morning.
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How many grams are in 0.50 moles of LiBr?
What general trend does electronegativity follow on the periodic table?
Answer:
On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.
A bottle contains 3.100 ml of a liquid. the total mass of the bottle and the liquid together is 6.300 g. the mass of the empty bottle is 4.240 g. what is the density of the liquid?
The density of the liquid in the bottle will be 0.665 g/mL
What is density?Mathematically, density is given as:
Density = mass/volume
Mass of liquid = mass of bottle + liquid - mass of empty bottle
= 6.3 - 4.24 = 2.06 g
volume of liquid = 3.100 mL
Density of liquid = 2.06/3.100 = 0.665 g/mL
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During dehydration synthesis, an enzyme removes a ____________ functional group from the monomers of one organic molecule and a hydrogen from another monomer, linking monomers together to form a ____________ . This chemical reaction also forms ____________ .
Linking monomers together to form a polymer .This chemical reaction also forms water molecules.
What is Polymerization?This is a type of reaction which involves the linking of two or more monomers to form a polymer.
Dehydration reaction forms water molecules as part of the product thereby making it the most appropriate choice.
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You wish to make a 0.285 M hydroiodic acid solution from a stock solution of 12.0 M hydroiodic acid. How much concentrated acid must you add to obtain a total volume of 50.0 mL of the dilute solution
The amount, in mL, of the concentrated acid required, would be 1.1875 mL
DilutionFrom the dilution equation:
m1v1=m2v2 where m1 and m2 = molarity before and after dilution, and v1 and v2 = volume before and after dilution.
m2 = 0.285M, m1 = 12.0M v2 = 50.0 mL
v1 = m2v2/m1 = 0.285x50/12 = 1.1875 mL
Thus, 1.1875 mL of the acid would be taken and diluted with water up to the 50 mL mark.
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Part A
Look at the graphical display for the group 1 elements. What pattern do you observe about atomic radii as you move from
ydrogen at the top of the table to francium at the bottom?
The atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.
What is atomic radii ?The total distance from the nucleus of an atom to the outermost orbital of its electron is known as its atomic radii or atomic radius.
As we go down the group, the number of orbits or shell increases.
Hence, atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.
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help me plss ty in advanced
Answer:
See below ~
Explanation:
The respective pairs are :
× Ribose ⇒ The sugar of RNA
× Double helix ⇒ Structures of DNA
× Watson & Crick ⇒ Proposed the double helix model
× Base pair ⇒ Adenine - Thymine pair
× Cytosine ⇒ The nucleotide pair of Guanine
please help!
What happens when a hot metal rod with a temperature of 100 degrees is placed in 10 degree cold water ?
1) the temperatures of the rod & water will both decrease
2) heat will travel out of the metal rod & into the water
3) the temperatures of the rod & water will both decrease
4) the temperatures of the rod & water will both increase
Answer:
What happens when a piece of hot metal is dropped in room temperature water. Over time the metal will cool and the water will heat up. Eventually the two objects will have the same temperature. They are then said to be in thermal equilibrium with one another.
Explanation:
i hope this helps you!!
4.
A dead alkaline battery is found to contain a compound of manganese and oxygen. Its percentage composition
is 70.0% Mn and 30.0% O. What is the empirical formula of this substance?
The dead battery with a percentage composition of 70.0% Mn and 30.0% O has the empirical formula Mn₂O₃.
What is an empirical formula?An empirical formula is the minimal relationship between the atoms in a chemical formula.
A dead alkaline battery is 70.0 % Mn and 30.0 % O. To find the empirical formula, we will divide each percentage by the molar mass of the element.
Mn: 70.0/54.94 = 1.27O: 30.0/16.00 = 1.88Then, we divide both numbers by the smallest one.
Mn: 1.27/1.27 = 1O: 1.88/1.27 ≈ 1.5Finally, we multiply both numbers by 2 so that they are whole numbers.
Mn: 1 × 2 = 2O: 1.5 × 2 = 3The empirical formula of the compound is Mn₂O₃.
The dead battery with a percentage composition of 70.0% Mn and 30.0% O has the empirical formula Mn₂O₃.
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Find the number of protons, neutrons, and electrons in 6429Cu.
Answer:
bottom :)
Explanation:
Question: How Many Protons, Neutrons, And Electrons Are In A Neutral Atom Of Copper, Cu, With An Atomic Number Of 29 And Mass Number Of 64? A. Protons = 64, Neutrons = 29, Electrons = 29 B. Protons = 35, Neutrons = 29, Electrons = 35 C.
How much iodine (I2), in grams, should be added to water to produce 2.5L of solution with a molarity of 0.56M?
Molarity=Moles of solute/Volume of solution in L
So
0.56M=moles/2.5Lmoles=0.56(2.5)moles of Iodine=1.4molMads of Iodine
Moles(Molar mass)1.4(126.9)177.66gWhich two factors decrease as the averagespeed of the particles in a sample
of matter decreases?
o a. the average mass of the particles
b. the temperature of the sample
o c. the weight of the sample
d. the average kinetic energy of the particles
Answer:
d the average kinetic energy of the particles
A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution
[tex]~~~~~\text{pH} + \text{pOH} = 14\\\\\implies \text{pOH} = 14- \text{pH}\\\\\implies \text{pOH} = 14 - 11.8\\\\\implies \text{pOH} = 2.2\\\\\text{Now,}\\\\~~~~~~~\text{pOH}= -\log\left[\text{OH}^{-1}\right]\\\\\implies \left[\text{OH}^{-1} \right] = 10^{-\text{pOH}} = 10^{-2.2}~ = 0.006309~M\\\\\text{Hence the concentration of OG}^{-1}~ \text{is 0.006309~M}[/tex]
How many grams of aluminum chloride can be produced from 7.32g of ammonium perchlorate?
Answer:
2.77g of [tex]AlCl_{3}[/tex] can be produced.
Explanation:
Use stoichiometry.
Balanced equation: [tex]3Al + 3NH_{4} ClO_{4}[/tex] ⇒ [tex]Al_{2} O_{3} + AlCl_{3} +3NO + 6H_{2} O[/tex]
[tex]NH_{4} ClO_{4} : AlCl_{3}[/tex]
3 : 1 **[tex]n=\frac{m}{M}[/tex]
0.0623** : [tex]x[/tex] [tex]n=\frac{7.32}{117.49}[/tex] = 0.0623
[tex]3x=0.0623\\x=0.020767[/tex]
[tex]n=\frac{m}{M}[/tex]
[tex]m=nM[/tex]
m= (0.020767)(133.34)
m= 2.77g
Each substance to the right of the arrow in a chemical equation is a.
49. How much precipitate would result if you have 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation
a. 5g
b.70 g
c. 35g
d. 13g
Option D is the correct answer , 13.5gm of precipitate would result if 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation.
What is Solubility ?the maximum quantity of a substance that will dissolve in a certain quantity of water at a specified temperature.
From the Solubility Graph of NaCl , we can see that the solubility of NaCl at 10 C is around 36.5gm/L.
If it is cooled down to saturation we will see the precipitate forming and that will be equal to the difference of solute present and the solubility.
As it is given that 50gm of solute is present
The precipitate will be 50- 36.5 gm, = 13.5 gm.
Therefore Option D is the correct answer , 13.5gm of precipitate would result if 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation.
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An example of polytamic anoin would be a. Ca+2 b. NH4+ c. F d. PO4-3
[tex]PO_4^{-3}[/tex] and [tex]NH^{4+}[/tex] are polyatomic anions composed of two or more atoms.
What is a polyatomic anion?A polyatomic ion is an ion composed of two or more atoms. Examples: The hydroxide cation ([tex]OH^-[/tex]) and the phosphate cation ([tex]PO_4^{3-}[/tex]) are both polyatomic ions.
[tex]PO_4^{-3}[/tex] and [tex]NH^{4+}[/tex] are the polyatomic anions because both contain more than 1 atom.
Hence,[tex]PO_4{-3}[/tex] and [tex]NH^{4+}[/tex] are polyatomic anions composed of two or more atoms.
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Which structure is the Lewis structure for ammonia (NH3)?
Answer:
C
Explanation:
Because NH3 has 8 valence electrons, and Hydrogen can only have 1 bond
Cyclohexenone is a useful starting material for drug synthesis. For each reaction, predict the major addition product for the reaction between an α,β‑unsaturated ketone and carbon nucleophile
Cyclohexenone is a useful starting material for drug synthesis. For each reaction. The major additional product for the reactions are respectively given as;
A soft electrophile A hard electrophileThis is further explained below.
What is an electrophile?Generally, An electrophile is simply defined as a species of a chemical compound that may receive an electron pair from a carbonyl group in order to establish chemical bonds.
In conclusion, It is common practice to add 1,4 significance to the alkene of asymmetric nucleophiles when using organocuprate reagents in the process at the top.
Grignard reagents often add 1,2 to the carbonyl of asymmetric carbonyl compounds in the bottom reaction
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Cyclohexenone is a useful starting material for drug synthesis. For each reaction. The major additional product for the reactions are respectively given as;
A soft electrophile
A hard electrophile
What is an electrophile?Generally, An electrophile is simply defined as a species of a chemical compound that may receive an electron pair from a carbonyl group in order to establish chemical bonds.
In conclusion, It is common practice to add 1,4 significance to the alkene of asymmetric nucleophiles when using organocuprate reagents in the process at the top.
Grignard reagents often add 1,2 to the carbonyl of asymmetric carbonyl compounds in the bottom reaction
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Which describe beta decay? check all that apply. in beta decay, a proton becomes a neutron and a positron. in beta decay, a neutron becomes a proton and an electron. in beta decay, a neutron becomes a proton and a gamma ray. beta decay releases energy. beta decay releases a helium-4 nucleus.
The statements which best describe beta decay are: option 1, 2 and 4.
What is a beta particle?A beta particle can be defined as an isotope which typically undergoes radioactive decay through the emission of a radiation with a -1 charge.
Based on scientific information and records from radioactivity, we can infer that the statements which best describe beta decay are:
During beta decay, an atom of proton becomes a neutron and a positron. During beta decay, an atom of neutron becomes a proton and an electron.Beta decay releases energy.Read more on beta decay here: https://brainly.com/question/12448836
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Answer:
1,2,4
Explanation:
Circulacion de electrones en un material conductor en determinado tiempo.
Answer:
falso
Explanation:
tiempo no determinado El circulation de elctrones
Explain what is meant by the phrase 'the heat death of the universe."
Answer:
See explanation.
Explanation:
Are you literally posting your entire you chemistry homework on this site, one question at a time? Anyways, the heat death refers to the second law of thermodynamics and entropy. Heat is constantly flowing from warmer to cooler objects and never the other way around. This heat flow increases entropy, which is constantly increasing. The universe will eventually disperse all of its heat energy away to continuously increase entropy and reach a limit as the temperature reaches 0 K at which point all molecular motion will cease and so will the life of the universe.
Answer:
hypothesis on the ultimate fate of the universe, which suggests the universe would evolve to a state of no thermodynamic free energy and would therefore be unable to sustain processes that increase entropy.
Explanation:
What is the name of this structural formula?
Answer:
3-methyl pentane
Explanation:
The longest chain of carbons is 5, so it will have the prefix pent-.
The first branch is on the 3rd carbon, and it is a 1 carbon branch. This means the branch will be called 3-methyl.
Now to find the suffix we need to count the carbons and the hydrogens. There are 6 carbons and 14 hydrogens, which follows the formula for an alkane ([tex]C{_n}H{_{n+2}}[/tex]). This gives it the suffix -ane.
Now we can name the compound:
3-methyl pentane
That is the answer
- Kan Academy Advance
How many moles of Calcium Oxide are needed to produce 4 moles of Calcium Hydroxide?
Taking into account the reaction stoichiometry, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.
Reaction stoichiometryIn first place, the balanced reaction is:
CaO + H₂O → Ca(OH)₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CaO: 1 mole H₂O: 1 moleCa(OH)₂: 1 moleMoles of CaO requiredThe following rule of three can be applied: If by stoichiometric reaction 1 mole of Ca(OH)₂ is produced by 1 mole of CaO, 2 moles of Ca(OH)₂ are produced by how many moles of CaO?
[tex]moles of CaO=\frac{2 moles of Ca(OH)_{2}x1 mol of CaO }{1 mole of Ca(OH)_{2}}[/tex]
moles of CaO= 2 moles
Finally, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.
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