Answer:
Percient yield of reaction: 85 %
Explanation:
The reaction is:
PCl₃ + 3H₂O → H₃PO₃ + 3HCl
We only have data from the chloride, so we assume water is in excess. We convert the mass to moles:
62 g . 1mol / 137.32 g = 0.452 mol
If ratio is 1:3, from 0.452 mol we would produce three times as big, that amount. (0.452 . 3) = 1.36 moles of HCl.
We convert the amount to mass.
1.36 mol . 36.45g / 1mol = 49.4 g
This value of produced HCl is the theoretical yield. To determine the percent yield we make:
(Yield produced / Theoretical yield) . 100
(42 g / 49.4g) . 100 = 85%
Answer:
Yes it is 85.0%
Explanation:
A group of scientists are studying the microhabitat on the inside of a hollow log. Twice a year, they take samples of the wood and make observations about organisms living in the log. They observe that the types of bacteria and fungi living in the log change over time. The properties of the wood inside of the log also change.
Which of the following statements best describes why the types of organisms in the log change over time?
A.
Some organisms are adapted to live in a wide range of conditions.
B.
Organisms in the log do not compete for available resources.
C.
Organisms in the log stabilize the conditions in their environment.
D.
Different organisms are adapted for different conditions.
Answer:
D
Explanation:
I took a study island on this
Help!!!!!!!!!!!!!!!!!!
The density of the sample : 0.827 g/L
Further explanationIn general, the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm , N/m²
V = volume, liter
n = number of moles
R = gas constant = 0.082 l.atm / mol K (P= atm, v= liter),or 8,314 J/mol K (P=Pa or N/m2, v= m³)
T = temperature, Kelvin
n= 1 mol
MW Neon = 20,1797 g/mol
mass of Neon :
[tex]\tt mass=mol\times MW\\\\mass=1\times 20,1797 =20.1797~g[/tex]
The density of the sample :
[tex]\tt \rho=\dfrac{m}{V}\\\\\rho=\dfrac{20,1797}{24.4}=0.827~g/L[/tex]
or We can use the ideal gas formula ta find density :
[tex]\tt \rho=\dfrac{P\times MW}{RT}\\\\\rho=\dfrac{1\times 20.1797}{0.082\times 298}\\\\\rho=0.826~g/L[/tex]
Identify the number of protons and electrons
in fluorine and iodine.
The element fluorine helps prevent tooth decay and is found in many toothpastes,
Atomic number: 9
Answer:
Fluorine has 9 protons and 9 electrons
Iodine has 53 protons and 53 electrons
Explanation:
Fluorine has 9 protons and 9 electrons and Iodine has 53 protons and 53 electrons.
What is an electron?An electron is defined as a subatomic particle which is charged negatively either bound to an atom or not it means they are freely found. The nucleus of an atom is made up of electron, proton and neutron. The electron is a basic particle and electron is not made of anything.
The nature of electron is free it means they are present freely in nature and an atom consist of electron.The main function of electron is that function of negatively- charged component of an atom.
The electrons are primary function of current conducting and electrons number as well as atomic number of an element is always same or equal. There is no size of electron but the mass of electron is 9×10^-31.
Therefore, Fluorine has 9 protons and 9 electrons and Iodine has 53 protons and 53 electrons.
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What is the primary result of a fission
reaction?
(1) conversion of mass to energy
(2) conversion of energy to mass
(3) binding together of two heavy nuclei
(4) binding together of two light nuclei
Answer:
(1) conversion of mass to energy
Explanation:
Nuclear fission: In nuclear fission, an unstable atom splits into two or more smaller pieces that are more stable, and releases energy in the process. The fission process also releases extra neutrons, which can then split additional atoms, resulting in a chain reaction that releases a lot of energy.
The primary result of a nuclear fission reaction is the conversion of energy to mass.
What is nuclear fission reaction?Nuclear fission reaction is a reaction in which the nucleus of an atom splits into two or more smaller nuclei. The nuclear fission reaction produces gamma photons and releases a very large amount of energy even by the energetic standards of radioactive decay.Hence, option 2 is the answer.
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Without looking at the periodic table, identify the group, period, and
block in which the element that has the electron configuration [Xe]6s2 is
located
the group : 2
periode : 6
block = 2
atomic number = 56
Further explanationWe can divide the periodic system into several parts:
1. Block s: groups 1 and 2 (having a configuration of 1s-7s) consist of active metals except for H (non-metals) and He (noble gases)
2. Block p: group 13-18 (has a 2p-6p configuration), also called a representative element because it includes metals, non-metals and metalloids
3. Block d: group 3-12 (having the 3d-6d configuration), are transition metal elements
4. Block f: Lanthanides and Actinides (having a 4f-5f configuration), are inner transition elements that are also metal
The element with the electron configuration : [Xe]6s²
The outer shell 6s² :
Electron configuration :
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s² : electron =56
group⇒valence electron ⇒2
period⇒the greatest value of the quantum number n⇒6
The element that is in period 6, and belongs to group 2 and has the atomic number 56 and in the block s
if you had 15 moles of Oxygen (O2), how many moles of water (H2O) would you be able to make?
Answer:
30 moles of water will produced.
Explanation:
Given data:
Number of moles of O₂ react = 15 mol
Number of moles of water formed = ?
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Now we will compare the moles of water with oxygen.
O₂ : H₂O
1 : 2
15 : 2×15 = 30 mol
30 moles of water will produced.
Which one is not acid? Na₂O or CO₂
Answer:
It is Na2O because it doesn't show any acidic properties.
Balance this equation pls
__NaCl + __CaF2→ __NaF +__CaCl2
Answer:
2NaCl + 1CaF²--------》2NaF + 1CaCl²
Answer:
2NaCl + CaF2 >>> 2NaF + CaCl2
In the following reaction, which element or compound is the oxidizing agent?
I NEED HELP ASAP
Answer:
[tex]O_{2}[/tex] is the oxidizing agent
Explanation:
An oxidizing agent is an element in a reaction that accepts the electrons of another element. It is typically hydrogen, oxide, or any halogen. In this case, it is oxygen. The answer is 02.
Answer:
i think it's 02 i might be wrongExplanation:
Which measurement is a vector?
What two things determine the gravity of an object?
A. mass & distance
B. mass & weight
C. density & mass
D. distance & weight
Answer:
A mass and distance
Explanation:
How many moles are in 1.81 x 1024 molecules of CO2?
Answer:
3.01 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{1.81 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 3.006644...[/tex]
We have the final answer as
3.01 molesHope this helps you
how can you tell if an element has been reduced?
Answer:
Chemists keep track of how electrons are transferred between atoms in a reaction using an oxidation number. If the oxidation number of an element in the reaction increases or becomes less negative, the element has been oxidized, while a decreased or more negative oxidation number means the element has been reduced.
Answer:
It has more electrons in the product than in the reactant
Explanation:
A p e x
How does the quantum theory of atoms explain the nature of the emission-line spectrum of hydrogen?
Energy takes on discreet values, we notice that only certain values of energy are allowed hence the line spectrum of the hydrogen atom.
According to the Bohr model of the atom, energy levels within the atom is quantized. Energy quantization implies that energy occurs in discreet packets and do not take on intermediate values.
Because energy takes on discreet values, we notice that only certain values of energy are allowed hence the line spectrum of the hydrogen atom.
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The period of daylight experienced each day on every part of Earth would be shorter if which one of the following changes occurred?
A Earth had a greater diameter.
B The mass of the Sun was greater.
C Earth rotated more quickly on its axis.
D The Sun was farther away from Earth.
Answer:
c
Explanation:
Which option listed above represents the correct way the layers would form? Explain
your choice by describing which chemical or physical property determines the
layering.
Answer:
option 1 pls mark bbrainliest
Using the model,what is the mass of the atom pictured?
A)3amu
B)5amu
C)7amu
D)9amu
Answer:
with 20 protons (p=20) and 22 neutrons (n=22)? 47 ... Listed below are the charges and masses of four ... a) +2,2 amu c ) +1, 1 amu least b) ... pudding” Model.
Explanation:
Answer:
7amu
Explanation:
Atoms are composed of three particles. The proton, neutron, and electron.
The mass of the atom in amu is just the number of protons and neutrons in the nucleolus since they both have a mass of about 1 amu. Electrons are not counted since they have an incredibly small mass that ultimately does not matter.
This atom has 3 protons (positively charged particle) and 4 neutrons (particle with no charge) which together gives a mass of 7 amu.
which information does the chemical formula co2 not give you?
A. number of valence electrons in each atom
B. ratio of atoms in the compound
C. total number of atoms in one molecule of the compound
D. type of elements in the compound
Answer:
A
Explanation:
Considering the definition of chemical formula, the correct answer is option A): number of valence electrons in each atom.
A chemical formula is the representation of the elements that make up a compound and the proportion in which they are found, or the number of atoms that make up a molecule.
In other words, a chemical formula is an alphanumeric expression that is used to indicate the composition of a chemical substance and that is constructed from the symbols of its constituent elements, affected by numerical subscripts that report the number of atoms of each element that it is part of the substance.
In summary, the correct answer is option A): number of valence electrons in each atom.
Learn more:
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With all his gear, Neil Armstrong weighed 360 pounds on Earth. When he landed on the Moon, he weighed 60 pounds. Why?
EASY QUESTION!!!! 12 POINTS!!!
Neutron____Neutron
push apart
pull together
Answer:
Neutron pull together Neutron
How many more valence electrons does this atom need to fulfill the Octet
Rule? (Urgent need help)
Answer: The octet rule is a bonding theory used to predict the molecular structure of covalently bonded molecules. According to the rule, atoms seek to have eight electrons in their outer—or valence—electron shells. Each atom will share, gain, or lose electrons to fill these outer electron shells with exactly eight electrons.
Explanation:
How many cells could form from one frog egg cell and three hours
Answer:
Some cells, such as the frog egg cells shown here, divide every 30 minutes, and others take as long as a year! The table below compares the length of different cell cycles. 2. With each cell cycle, two cells form from one cell.
After 3 hours, the number of cells formed from one frog egg cell has been 64.
The division of the frog cell occurs every 30 minutes. Thus in 3 hours, the number of divisions occurs:
30 minutes = 1 division
3 [tex]\times[/tex] 60 minutes = [tex]\rm \dfrac{1}{30}\;\times\;180[/tex]
= 6 divisions.
The number of cells formed after n divisions can be given by = [tex]\rm 2^n[/tex]
where n is the number of division cycles.
The number of cells after 6 division cycles = [tex]\rm 2^6[/tex]
The number of cells = 64.
After 3 hours, the number of cells formed from one frog egg cell has been 64.
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What is the volume of 50.0 g of table sugar if the density of the sugar is 1.59 gcm3 ?
Answer:
31.45 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{50}{1.59} \\ = 31.446540...[/tex]
We have the final answer as
31.45 cm³Hope this helps you
Which of the following is NOT a physical property?
A. melting point
B. state of matter
C. density
D. flammability
Answer:
i think.its D ddddddddddddd
MULTIPLE CHOICE QUESTION URGENT URGENT URGENT PLS HELP ME
Answer:
The answer is 4
Explanation:
plz give me brainliest :)
An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. What is its mass number? *
Answer:
26.981539
Explanation:
Which orders the activities from the greatest to least impact to reduce consumption of fossil fuels?(1 point)
carpool to work, walk to work, drive an electric car to work
walk to work, carpool to work, drive alone to work
drive an electric car to work, walk to work, carpool to work
drive alone to work, drive an electric car to work, carpool to work
Answer:
walk to work, carpool to work, drive alone to work
Explanation:
A solution is made by dissolving 0.0503 kg of biphenyl (C12H10) in
350.0 mL of benzene (C6H6).
What would be the osmotic pressure (in atm) of this solution at 40.0
°C? (The density of benzene is 0.877 g/mL.)
Answer:
Letter A po
Explanation:
yanffdddddd
What is the correct name for the following compound? "Make sure you are using correct naming
rules"
Answer:
c
Good luck on your assessment!