Answer:
42.394
Explanation:
trust me lol
SUB TO RahimZ for 15 points i want 100 subs
The equilibrium constant Kc for the reaction below is 0.00584 at a certain temperature. Br2(g) ⇌ 2Br(g) If the initial concentrations are [Br2] = 0.0345 M and [Br] = 0.0416 M, calculate the concentrations of these species at equilibrium.
Answer:
Explanation:
Given that:
The chemical equation for the reaction is:
Br2(g) ⇌ 2Br(g)
Initially 0.0345M 0.0416M
[tex]Q_C = \dfrac{[Br]^2}{[Br_2]} = \dfrac{(0.0416)^2}{(0.0345)}= 0.05016[/tex]
[tex]Q_C =0.05016 >>> K_c(0.00584)[/tex]
Thus, the given reaction will proceed in the backward direction
The I.C.E table is as follows:
Br2(g) ⇌ 2Br(g)
I 0.0345 0.0416
C +x -2x
E (0.0345+x) (0.0416 -2x)
[tex]K_c = \dfrac{[Br]^2}{[Br_2]} = \dfrac{(0.0416-2x)^2}{(0.0345+x)} = 0.00584[/tex]
= 0.00173056 - 0.0832x - 0.0832x + 4x² = 0.00584 (0.0345 +x)
= 0.00173056 - 0.166x + 4x² = 2.0148× 10⁻⁴ + 0.00584x
= 0.00173056 - 2.0148× 10⁻⁴ - 0.166x - 0.00584x + 4x²
= 0.00152908 - 0.17184x + 4x²
Solving by using Quadratic formula
x = 0.03038 or 0.0126
For x = 0.03038
At equilibrium
[Br₂] = (0.0345 + 0.03038) = 0.06488 M
[Br] = (0.0416 -2(0.03038)) = - 0.01916 M
Since we have a negative value for [Br], we discard the value for x
For x = 0.0126
At equilibrium
[Br₂] = (0.0345 + 0.0126) = 0.0471 M
[Br] = (0.0416 -2(0.0126)) = 0.0164 M
What is iron's atomic mass? (round to tenths )
plz help me and fast
Answer:1.atoms give one or more electrons with each other to form the bond
2. Each atom is left with a complete outer shell
3. A covalent bond forms between two
nonmetals
Explanation:
What is the purpose of coating a plastic record with metal before electroplating is done?
Answer:
i hope it helps
Explanation:
The purpose of preparing the surface before beginning to plate another metal onto it is to ensure that it is clean and free of contaminants, which may interfere with the bonding. Contamination often prevents deposition and lack of adhesion. Normally this is done in three steps: cleaning, treatment and rinsing. Cleaning usually consists of using certain solvents such as alkaline cleaners, water, or acid cleaners in order to remove layers of oil on the surface. Treatment includes surface modification which is the hardening of the parts and applying metal layers. Rinsing leads to the final product and is the final touch to electroplating. Two certain methods of preparing the surface are physical cleaning and chemical cleaning. Chemical cleaning consists of using solvents that are either surface-active chemicals or chemicals which react with the metal/surface. In physical cleaning there is mechanical energy being applied in order to remove contaminants. Physical cleaning includes brush abrasion and ultrasonic agitation.
SOMEONE HELP ME PLEASEEEE!!!
What is the outermost layer of the Earth called?
Answer:
the outermost layer called Crust
A force of 49 Newtons is applied to a rock, which causes it
to be lifted 2 meters in 5 seconds. How much power is
exerted during this time?
Answer:
19.6Watts
Explanation:
Given parameters:
Force applied = 49N
Distance = 2m
Time = 5s
Unknown:
Power = ?
Solution:
Power is the rate at which work is being done;
Power = [tex]\frac{Work done }{time}[/tex]
Work done = force x distance = 49 x 2 = 98J
So;
Power = [tex]\frac{98}{5}[/tex] = 19.6Watts
An object with a mass of 3.2kg has a force of 16.3 newtons to the right and 6.7 newtons to the left applied to it. What is the resulting acceleration of the object?
Answer:
3m/s²
Explanation:
Given parameters:
Mass of object = 3.2kg
Force to the right = 16.3N
Force to the left = 6.7N
Unknown:
Acceleration of the object = ?
Solution:
To solve this problem, we use newtons second law of motion;
Net force = mass x acceleration
Net force on object = Force to the right - Force to the left
Net force = 16.3N - 6.7N = 9.6N
So;
9.6 = 3.2 x a
a = [tex]\frac{9.6}{3.2}[/tex] = 3m/s²
plzzzzzz help me I will mark u brainiest
Brainless answer:
I think it is ionic.. I am not sure
To take a weighted average of all the naturally occurring isotopes of an element in order to arrive at an average
atomic mass, you would
o multiply the mass of each isotope by the decimal fraction representing its abundance naturally, then add all these products
together.
O use the isotope with the largest mass.
O use the isotope with the most average mass.
o add all the masses of all of the isotopes, then divide by the number of isotopes.
Answer:
o multiply the mass of each isotope by the decimal fraction representing its abundance naturally, then add all these products together.
Explanation:
To find the average atomic mass of an atom, take the weighted average of all naturally occurring isotopes of an element and sum them together.
The average atomic mass is determined from the geonormal abundances of the isotopes.Average mass of all isotopes = summation of all the mass of isotopes of the element x abundance of the isotope.
The abundance of the isotope is usually taken as a decimal fraction.
Why do electrons gain energy?
Electrons can gain the energy it needs by absorbing light. If the electron jumps from the second energy level down to the first energy level, it must give off some energy by emitting light. The atom absorbs or emits light in discrete packets called photons, and each photon has a definite energy.
☁️My Answer☁️:
Atomic electrons lose / gain energy when transferring from one orbital to another and hence emitting / absorbing a photon. Free electrons (by which I mean electrons that are not part of an atom) lose or gain energy by scattering inelastic ally with atoms or molecules. In this case, energy is transferred to / from the atom or molecule from / to the electron in the form of kinetic energy
When metal atoms bond with nonmetal atoms, what will the non metal atoms do?
Answer:
Ionic bonding involves the transfer of electrons from a metal atom to a non-metal atom until the outer shells of their resultant atoms are similar to that of a noble gas. The metals lose electrons and form cations while the non-metals accept the electrons and form anions.
When a chemical bond forms between metal and nonmetal atoms, the nonmetal atom accepts electrons from the metal atom to reach a stable state.
A bond that forms between metal and nonmetal atoms is called an ionic bond. In ionic bonding, the metal atom, the cation, donates electrons to the nonmetal atom, the anion.
Thus, both electron donor and acceptor are able to reach an octet state through donation/acceptance of electrons and an ionic bond is formed as a result.
More on ionic bonding can be found here: https://brainly.com/question/11527546?referrer=searchResults
A genetic mutation is always observable in an organism physical appearance True or false
Answer:
false
Explanation:
false, only a small percentage of mutations cause genetic disorders—most have no impact on health or development. For example, some mutations alter a gene's DNA sequence but do not change the function of the protein made by the gene.
A person is pushing a box across a table. The measured forces on the box are 10N, 14N, -7N, -10N.
Which force is represented by -7N?
force of friction
normal force
force of gravity
push force
Answer:
a
Explanation:
The force acting downwards or opposite to normal force which reduces the movement is indicated with a negative sign. Hence, the force of -7N is frictional force.
What is force?Force is an external agent acts on a body to change it from the state of rest or motion. There are various forces such as frictional force, magnetic force, gravitational force etc.
Frictional force is the resistive force which make the object resistive in motion. Thus it is indicated with a negative sign. Gravitational force is the force by which an object attracts other objects into its centre of mass.
Hence, gravitational force also making the body resistive to motion. Here, -10 N is the gravitational force acting on the box and it experience a force of -7N which also resists its force in the opposite direction of the normal force.
Hence, -7N is the force of friction acting on the body.
To find more on friction, refer here:
https://brainly.com/question/13000653
#SPJ6
Oil of vitriol is a substance that humankind has known of for
thousands of years! Today the substance is known by it's
scientific name sulfuric acid and has the molecular formula
H2SO4.
What is the molar mass of H2SO4?
g/mol
Answer: 98.08 g/mol
:))))))))
Which scientific phenomena strengthen wegener's theory?
Seawater is salty and has the ability to rot metal and wood.
True
False
Answer:
maybe it is true
Explanation:
it can 5×then the normal one
A sample of an element has a volume of 78.0 mL and a density of 1.85 g/mL. What is the mass in grams of the sample?
Hey there!:
density = 1.85 g/mL
volume = 78.0 mL
Mass = ??
therefore:
D = m / V
1.85 = m / 78.0
m = 1.85 x 78.0
m = 144.3 grams
Hope this helps!
How would one convert 36 yd to centimeters 2.54 cm = 1 in)?
Answer:
D
Explanation:
A P E X
D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.
What are centimetres?A metric unit of length, equal to one-hundredth of a metre.
To convert a yard measurement to a centimetre measurement, multiply the length by the conversion ratio. The length in centimeters is equal to the yards multiplied by 91.44.
D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.
Learn more about centimetres here:
https://brainly.com/question/668007
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How to test for ionic and covalent substances
Answer:
An easy way of determining the type of bond within a molecule is to look for the type of compound involved.
if you are given one element name and % by mass, how do you find the other element in the compound? give example plz
The percentage of elements in the compound is determined from the number of elements in the compound
Further explanationProust states the Comparative Law that compounds are formed from elements with the same Mass Comparison so that compounds have a fixed composition of elements
[tex]\tt \%A~in~A_xB_y=\dfrac{x\times Ar~A}{MW~A_xB_y}\times 100\%[/tex]
[tex]\tt \%B~in~A_xB_y=\dfrac{y\times Ar~B}{MW~A_xB_y}\times 100\%[/tex]
Example
% Lithium (Li) in Li₂CO₃(lithium carbonate)
Ar of Li = 6.941 g/mol
MW of Li₂CO₃ = 73.891 g/mol
[tex]\tt \%Li=\dfrac{2.Ar~Li}{MW~Li_2CO_3}\times 100\%\\\\\%Li=\dfrac{2\times 6.941}{73.891}\times 100\%=18.79\%[/tex]
Explain what happened to the valence electrons in each atom.
Answer:
the happen is a fraction of valence is a compalation of the electrons
Explanation:
yan yung answer ko sana makatulong
An unknown element is found to have three naturally occurring isotopes with atomic masses of 34.9689 (76.000%), 36.9659 (23.988%) and 35.9683 (0.012%) Which of the following is the unknown element?
Answer:
Chlorine (35.44 amu)
Explanation:
An unknown element is found to have three naturally occurring isotopes with atomic masses of 34.9689 (76.000%), 36.9659 (23.988%) and 35.9683 (0.012%).
We need to find the mass of the unknown element. When abundances is given, then atomic mass is given by :
[tex]M=34.9689 (76.000\%)+36.9659 (23.988\%) +35.9683(0.012\%)\\\\=34.9689 (\dfrac{76}{100})+36.9659 (\dfrac{23.988}{100}) +35.9683(\dfrac{0.012}{100})\\\\=35.44\ \text{amu}[/tex]
So, the atomic mass of the unknown element is 35.44 amu and it is chlorine.
!!please help asap ty only if you can ty!!!
2. How many atoms of zinc are present in 0.48 mol of zinc?
(show solution)
Answer:
2.89× 10²³ atom of Zn
Explanation:
Given data:
Number of moles of Zn = 0.48 mol
Number of atoms of Zn = ?
Solution:
Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atom
0.48 mol × 6.022 × 10²³ atom / 1mol
2.89× 10²³ atom
can someone help me please?
Why can’t you see individual atoms without special tools?
Answer:
Even the most powerful light-focusing microscopes can't visualise single atoms. What makes an object visible is the way it deflects visible light waves. Atoms are so much smaller than the wavelength of visible light that the two don't really interact. To put it another way, atoms are invisible to light itself.
Explanation:
Can you give me Brainliest pls
And Your welcome :)
Answer:
The atoms are too small to see.
Explanation:
Hope my answer helped you!!
PLS HELP THIS IS TIMED
Describe how heat is transferred when you touch a piece of metal (that feels cool but is room temperature) with your finger. Use complete sentences and use the terms kinetic energy, collide, and conduct/conduction
Answer:
Explanation:
Conduction is the transfer of heat through stationary matter by physical contact. (The matter is stationary on a macroscopic scale—we know there is thermal motion of the atoms and molecules at any temperature above absolute zero.) Heat transferred from an electric stove to the bottom of a pot is an example of conduction.
Some materials conduct thermal energy faster than others. For example, the pillow in your room may the same temperature as the metal doorknob, but the doorknob feels cooler to the touch. In general, good conductors of electricity (metals like copper, aluminum, gold, and silver) are also good heat conductors, whereas insulators of electricity (wood, plastic, and rubber) are poor he
When baking it is best to use which of the following types of butter
Answer:
unsalted butter
Explanation: because it lets the real natural flavor come through.
Elements in Group 17 form which ion?
A. 1
B. +1
C. -1
D. 0
Answer:
Elements in group 17 form C. -1 ions
What happens to the atomic radius when an electron is lost?
A. The positive ionic radius is the same size as the neutral atomic
radius.
B. The positive ionic radius is larger than the neutral atomic radius.
C. The positive ionic radius does not follow a trend with the neutral
radius.
D. The positive ionic radius is smaller than the neutral atomic radius.
What is an atom? In your own words
What is at the center of an atom?
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across
The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged)
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