Explanation:
double replacement is type of reaction of this.it is already balanced.
Plate boundaries are places where which of these are known to occur?
a.volcanoes
b. earthquakes
c. trenches
d.mountains
e. all of the above
Answer:
all of the above
Explanation:
How much electrical energy is required to generate 1.000L of H, at 25°C and 1.00 atm pressure by the electrolysis of water?
The electrical energy required : 0.082 F
Further explanationGiven
1.000L of H₂ at 25°C and 1.00 atm
Required
Electrical energy
Solution
Redox reactions in water electrolysis :
Anode: 2H2O (l) → O2 (g) + 4H⁺ (aq) + 4e
Cathode: 4H2O (l) + 4e → 2H2 (g) + 4OH⁻ (aq)
Reaction: 2H2O → 2H2 (g) + O2 (g)
mol H₂ :
n = PV/RT
n = (1 atm x 1 L)/(0.082 x 298)
n = 0.041
From reaction at cathode : mol ratio of electron and H₂ = 4 : 2, so mol electrons :
= 4/2 x mol H₂
= 2 x 0.041
= 0.082
1 Faraday is the amount of electricity that is passed in the electrolysis cell to obtain 1 mole of electrons.
1 Faraday = 1 mole of electrons = 96500 Coulombs
So the energy required :
0.082 Faraday
What is the molarity of a CaCl2 solution containing 150g of CaCl2 in 400 mL?
Answer:
you have a 3.17molal solution: This is 3.17mol CaCl2 dissolved in 1 litre of water. Make this solution.
Molar mass CaCl2 = 110.9848 g/mol
3.17mol = 3.17*110.9848 = 351.822g
Total mass = 1000g H2O + 351.822g CaCl2 = 1,351.822g
Volume of this solution:
Volume = mass / density
Volume = 1,351.822/1.24
Volume = 1,090.2 mL
You have 3.17mol CaCl2 dissolved in 1,090.2 mL solution
Mol CaCl2 dissolved in 1000mL solution = 1000/1090.2*3.17 = 2.91 mol CaCl2
Molarity of CaCl2 solution = 2.91M
Explanation:
Do you think the amount of the liquid changes how acidic or basic it is? Explain your thinking.
I'll give brailiest.
Answer:
yes, the cells in the liguid is all congrating together.
Explanation:
Science Experiment : What can you fit in your mouth?
Answer:
u got a me off guard and thought sum else, lol but um a marble?
Explanation:
Please answer ASAP I’ll give the brainliest!
1. How many moles are in 3.63 x 1023 atoms of Mn?
2. Calculate the molar mass if AlBr3
3. Find the mass of 31.6 moles MnCI2
4. How many moles are in 5.6 L of KNO3?
5. How many moles are in 0.50 grams of CH3OH?
6. How many liters are in 8.20 x 10^14 molecules CsBr?
1. 1 mol=6.02.10²³ particles
[tex]\tt \dfrac{3.63\times 10^{23}}{6.02\times 10^{23}}=0.602~moles[/tex]
2. Molar mass = Total atomic mass of component
AlBr₃ = Ar Al + 3. Ar Br
AlBr₃ = 27 + 3. 80 = 267 g/mol
3. mass = mol x MW
MW MnCl₂ = 55 + 2.35.5=126 g/mol
mass = 31.6 x 126 =3981.6 g
4. at STP, 1 mol =22.4 L, so for 5.6 L :
[tex]\tt \dfrac{5.6}{22.4}=0.25~moles[/tex]
5. moles = mass : MW
MW CH₃OH = 12.1 + 4. 1 + 16.1 =32 g/mol
[tex]\tt moles=\dfrac{0.5}{32}=0.016[/tex]
6. 1 mol = 22.4 L at STP
1 mol = 6.02.10²³ particles
moles for 8.20 x 10¹⁴ molecules
[tex]\tt \dfrac{8.2\times 10^{14}}{6.02\times 10^{23}}=1.36\times 10^{-9}[/tex]
volume :
[tex]\tt 1.36\times 10^{-19}\times 22.4=3.05\times 10^{-8}~L[/tex]
Explain the Rules that determine how electrons are arranged around the nuclei of atoms. Use examples to explain the rules/principles.
Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. ... In a more realistic model, electrons move in atomic orbitals, or subshells.
By definition:
there are 7 energy levelsthere are 4 sub-levelsAufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits.Example: for hydrogen, its electronic configuration would be: 1s¹.The Electronic Configuration of the elements is the arrangement of all electrons of an element in energy levels and sub-levels (orbitals).
There are 7 energy levels, numbered from 1 to 7, and in which electrons are distributed, logically in order according to their energy level. Electrons with less energy will be spinning at level 1.
Each level is divided into sub-levels. These sub-levels into which each level is divided can be up to 4. These 4 sub-levels are called: s, p, d, f.
In the sub-level s there can only be a maximum of 2 electrons, in sub-level p there can be a maximum of 6 electrons, in the sub-level d 10 electrons and finally in the sub-level f there can be a maximum of 14 electrons.
Aufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits around the nucleus of the atom. This principle states that the filling of these orbitals occurs in increasing order of energy, that is, from the orbitals of lower energy to those of higher energy.
The simplest of the sub-levels is 1s. If you fill the 1s you can start filling the 2s. After the 2s sub-level is satisfied, the 2p can begin to fill and so on. The order is:
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p⁶7s²5f¹⁴6d¹⁰7p⁶
In this way, taking into account the atomic number Z of the element (which represents the number of protons of the element, and in a neutral atom it also indicates the number of electrons), the electrons that it has in the orbitals will be placed following the previously established.
For example, for hydrogen, whose atomic number is Z = 1, its electronic configuration would be: 1s¹.
Remember that the number 1 that precedes the representative letter of the orbital indicates the level of energy where the electron is located, the letter s indicates the type of orbital where the electron is located, and the exponent 1 indicates the number of electrons that are located in said orbital.
In summary:
there are 7 energy levelsthere are 4 sub-levelsAufbau's principle is a principle of atomic physics, which explains how electrons are accommodated in their orbits.Example: for hydrogen, its electronic configuration would be: 1s¹.Learn more:
https://brainly.com/question/5429660A living thing must respond to the environment, has needs, grows, must be 1 point
able to reproduce, breathes/respirates, and is made of one or more cells. *
True
False
What do we call the energy that travels from the sun in the form of waves
Answer:
Solar energy is essentially the light and heat emitted from the sun
a piece of tin foil has a volume of 0.645 ml to the 3rd if a piece measures 10.0 mm by 12.5 m what is the thickness of the foil
Explanation:
Fundamentally the aluminum foil is a rectangular prism. It has a length, a width, and a thickness.
The volume of a rectangular prism is expressed as
[tex]V = l * w * h[/tex]
If we know the volume and two of the three dimensions, we can rearrange the equation to solve for the thickness.
[tex]h = V/(l*w)[/tex]
But we should also be sure to confirm our units.
A liter is defined as 1000 cm^3. Therefore a mL is equal to 1 cm^3.
You should convert the units of measure given in the problem statement such that the units are aligned. For example, 10.0mm will be 1 cm and 12.5m will be 1250 cm. This will give you a height in cm.
do guitar strings deform? and how??
Answer:
yes; and because of how roughly they are played.
Explanation:
Which has the larger first ionization energy—magnesium or phosphorus?
a
Phosphorus has the greater first ionization energy.
b
Magnesium and phosphorus have equal first ionization energies.
c
Magnesium, but not phosphorus, has a measurable first ionization energy.
d
Magnesium has the greater first ionization energy.
Answer:
The correct option is a
Explanation:
First ionization energy is the minimum amount of energy required to remove the most loosely bound electron (valence electron) from the outermost shell of a gaseous or neutral atom. Since it takes more amount of energy to remove more electrons, it (ionization energy) generally increases across the period and decreases down a group because the closer the outermost shell is to the nucleus, the more difficult/energy required to remove electrons in that shell.
Since magnesium and phosphorus are on the same period (period 3), it can be deduced from the explanation above that phosphorus has a greater first ionization energy than magnesium because phosphorus (5 valence electrons) has more electrons in it's outermost shell than magnesium (2 valence electrons).
11. What is deceleration also called?
negative velocity
negative acceleration
negative speed
positive stopping
Explanation:
it is negative acceleration
Answer:
negative acceleration
Explanation:
Calculate the mass of lead (III) iodide, Pb13, that can be produced by the reaction of 135 g of lead, Pb,
and 338 g of iodine.
1. What is the limiting reactant?
2. How much product is formed?
Answer:
[tex]m_{PbI_3}=383.05gPbI_3[/tex]
Explanation:
Hello!
In this case, since the reaction between lead and iodine is:
[tex]2Pb+3I_2\rightarrow 2PbI_3[/tex]
We can see there is 2:2 and 3:2 mole ratio between each reactant and the product; in such a way, for the limiting reactant we must compute the moles of lead (III) iodide yielded by each reactant first:
[tex]n_{PbI_3}^{by\ Pb}=135gPb*\frac{1molPb}{207.2gPb}*\frac{2molPbI_3}{2molPb} =0.652molPbI_3\\\\n_{PbI_3}^{by\ I_2}=338gI_2*\frac{1molI_2}{253.81gI_2}*\frac{2molPbI_3}{3molI_2} =0.888molPbI_3[/tex]
Thus, the limiting reactant is lead because it yields the fewest moles of product. Next, we compute the mass of lead (III) iodide by multiplying the produced 0.652 moles by its molar mass:
[tex]m_{PbI_3}=0.652molPbI_3*\frac{587.91gPbI_3}{1molPbI_3} \\\\m_{PbI_3}=383.05gPbI_3[/tex]
Best regards!
a client is to receive 2.00g of a drug. The drug comes on a solution that has 500 mg per 5.0 mL. Each vial contains 10 milliliters. How many vials do you need?
True or false: In a chemical reaction, atoms of elements cannot be present in the products if they were not present in the reactants.
A
True
B
False
Answer:
A
Explanation: Your answer is A true
what information do you obtain from molecular formula?
Answer:
Molecular formulas describe the exact number and type of atoms in a single molecule of a compound. The constituent elements are represented by their chemical symbols, and the number of atoms of each element present in each molecule is shown as a subscript following that element's symbol.
Explanation:
hope this helped !
In a solution, there is 1 g of NaCl for every 5 g of water.
What is the ratio of sodium to water?
Answer:
i dont know
Explanation:
sorry
A 1% solution of Ivermectin contains how many mcg per mL?
Ivermectin is present at doses of 10 mg per mL, which is adequate to treat 110 lb (50 kg) of body weight (maximum 10 mL per injection site.).
What is Ivermectin ?
Antiparasitic medication ivermectin is used. It was first used in veterinary medicine to prevent and treat heartworm and acariasis after being discovered in 1975.
A steroid is not ivermectin. Drugs called steroids behave similarly to cortisol and work to reduce edoema in the body. Prednisolone, betamethasone, and other typical steroids are listed below. Ivermectin, on the other hand, is an anthelmintic medication.
Barbiturates (such as phenobarbital and butalbital), benzodiazepines (such as clonazepam and lorazepam), sodium oxybate (GHB), and valproic acid are a few of the medications that may interact with this medication.
Thus, Ivermectin is present at doses of 10 mg per mL, which is adequate to treat 110 lb (50 kg) of body weight (maximum 10 mL per injection site.)
To learn more about Ivermectin, follow the link;
https://brainly.com/question/28524204
#SPJ2
Which is least likely to occur after an experiment i conducted to test a hypothesis?
O The data is analyzed to see if it supports or refutes the hypothesis.
O The same experiment is conducted again to see if the data are reliable.
O The hypothesis becomes a theory if the results support it.
O Anew experiment is designed to provide additional data about the hypothesis.
Answer:
The hypothesis becomes a theory if the results support it is answer.
Explanation:
I hope it's helpful!
What is a pure substance made of two or more elements that are
chemically combined called?
element
mixture
compound
O proton
Answer:
compound
Explanation:
compound is something that consists of two or more element.
What kind of mixture is formed when you mix sugar and water? Explain.
please helppp
Answer:
You will form a solution
Explanation:
The sugar is added into the water, then the sugar will dissolve into the water.
Identify the most acidic hydrogens in each of the following molecules. Give the structure of the enolate ion arising from deprotonation. (a) Acetaldehyde; (b) propanal; (c) acetone; (d) 4-heptanone; (e) cyclopentanone.
Answer:
See explanation below (Brainlist please)
Explanation:
First of all, we need to understand what is an acidic hydrogen.
An acidic hydrogen, is the atom of hydrogen which is more propense to undergo an acid base reaction, and form a stable ion or molecule in the process.
In other words, is the hydrogen that is more vulnerable to get substracted in an acid base reaction to form another compound.
Knowing this information, gives us an idea of how a molecule can be formed and which kind of compound is formed.
Now, in this question, we have 5 molecules. Each of them is either a ketone or aldehyde, so this mean that we have the carbonile group (C = O), which means that is easier to identify the acidic hydrogen. This is because the Carbonile group is an attractor group, so, it will attract the charges by inductive effect (in some cases by resonance), and the molecule is more stable.
This can be shown by drawing the enolate ion that is formed once the molecule undergo the acid base reaction. As it's an enolate form that we are looking for, then it means that the ketone or aldehyde is undergoing an electrofilic attack with a base. This base will substract the most acidic hydrogen to form a better and stable enolate. The acidic hydrogen and the enolate form can be seen in the attached picture.
a) In the case of acetaldehyde, the most acidic will be the hydrogen of carbon 2, because the hydrogen from the carbonile, once it's substracted, the charge of the carbon cannot be stabilized by resonance. Carbon 2 hydrogens, can do this job easily.
b) Propanal happens something similar to acetaldehyde, the terminal hydrogen cannot be substracted, and carbon 3, once the hydrogen is gone, the negative charge cannot be stabilized by resonance, so hydrogens of carbon 2 can do this.
c) in the case of acetone, is easier to look because we only have the C = O between two methyl group, so you can use either carbon 1 or 3 to do the job.
d) 4 heptanone the most acidic hydrogen would be carbon 3 or 5, because they are closer to the C=O and the ion can be stabilized by resonance.
e) Finally in ciclopentanone, the most acidic hydrogen would be carbon 2 or 5.
See picture for a better understanding.
Hope it helps.
Which of these would be affected
immediately, if energy from the Sun were
stopped?
F. the flying birds
G. the ability of wood to burn
H. the chemical reaction that makes ash
J. the growth of trees
Answer:
J. the growth of trees
Explanation:
The growth of trees would be greatly impaired if the energy from the sun were stopped.
Plants generally use the energy from the sun to obtain their nourishment. This same process makes food available in the ecosystem.
Plants are producers of food. The process of photosynthesis allows plants to manufacture food by using sunlight to drive the reaction between carbon dioxide and water to produce glucose and oxygen gas. The glucose is used by plant for nourishment.determine the mass of 840 cm3 of oxygen gas, O2 at rtp
Answer:
Mass = 0.96 g
Explanation:
Given data:
Volume of oxygen = 840cm³
Temperature = at room = 25°C
Pressure = at room = 1 atm
Mass of oxygen = ?
Solution:
Volume of oxygen = 840 cm³ × 1 L /1000 cm³ = 0.84 L
Temperature = 25 +273.15k = 298.15 K
Formula:
PV = nRT
n = PV/RT
R = 0.0821 atm.L/mol.K
n = 1 atm × 0.84 L / 0.0821 atm.L/mol.K × 298.15 K
n = 0.84 atm.L / 24.48 atm.L/mol
n = 0.03 mol
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 0.03 mol × 32 g/mol
Mass = 0.96 g
how does the mass and size of an atom compare to the mass and size of the nucleus
Answer:
Explanation:
The nucleus of an atom is about 10-15 m in size; this means it is about 10-5 (or 1/100,000) of the size of the whole atom. ... (10-15 m is typical for the smaller nuclei; larger ones go up to about 10 times that.) Mass. Although it is very small, the nucleus is massive compared to the rest of the atom.
Answer:
The nucleus of an atom is about 10-15 m in size; this means it is about 10-5 (or 1/100,000) of the size of the whole atom. ... (10-15 m is typical for the smaller nuclei; larger ones go up to about 10 times that.) Mass. Although it is very small, the nucleus is massive compared to the rest of the atom.
Explanation:
Which would be the first of the two magnetic mentals in the mixture to be Melted? A. Copper B. Iron C. Nickel D. Yin
Answer:D. Tin
Explanation:
How many atoms make 3.42 moles of zinc (Zn)?
O 2.06 x 1024
65.38
1.76 x 1023
O 6.02 x 1023
Answer:
To obtain one mole of copper atoms (6.02 x 1023 atoms), ... mol Ag? (b) How many atoms of Ag are in 0.0342 mol Ag? 7 ... contain one S atom and two O atoms; calculate its molar mass.
PLZ HURRY GIVING 35 POINTS
HELP ASAP PLEASEEEEE!!!!! (serious answers only or i’ll report)
Mg(s)+2HCl(aq)—>MgCl2(aq) + H2(g)
what is the order of the reaction between magnesium and hydrochloric acid, with respect to magnesium?
Answer:
1st order
Explanation:
because magnesium has a coefficient of 1, it is first order
hydrochloric acid has a coefficient of 2, so it is second order
overall the reaction is third order (1+2)
