Answer:
the number of protons is called the atomic number
hope it helps you buddy
Answer: number of protons in an atom
Explanation:
What is the mass of 5 mole of ammonia . Calculate the number of NH₃ molecules, nitrogen atom and hydrogen atoms in it..
Molar mass of NH_3
[tex]\\ \sf\longmapsto 14u+3(1u)[/tex]
[tex]\\ \sf\longmapsto 14u+3u[/tex]
[tex]\\ \sf\longmapsto 17g/mol[/tex]
We know.
No of moles=Given mass/Molar mass
[tex]\\ \sf\longmapsto Given\;Mass=17(5)[/tex]
[tex]\\ \sf\longmapsto Given \:Mass\:of\:NH_3=85g[/tex]
Now
Lets write the balanced equation
[tex]\\ \sf\longmapsto N_2+3H_2=2NH_3[/tex]
There is 2moles of Ammonia 3moles of H_21mole of N_2Now
[tex]\boxed{\sf No\:of\:Molecules =No\:of\;moles\times Avagadro\:no}[/tex]
For Hydrogen
[tex]\\ \sf\longmapsto 3\times 6.023\times 10^{23}[/tex]
[tex]\\ \sf\longmapsto 18.069\times 10^{23}[/tex]
[tex]\\ \sf\longmapsto 1.8\times 10^{22}molecules[/tex]
For Ammonia
[tex]\\ \sf\longmapsto 2\times 6.023\times 10^{23}[/tex]
[tex]\\ \sf\longmapsto 12.046\times 10^{23}[/tex]
[tex]\\ \sf\longmapsto 1.2\times 10^{22}molecules[/tex]
For Nitrogen
[tex]\\ \sf\longmapsto 1\times 6.023\times 10^{23}[/tex]
[tex]\\ \sf\longmapsto 6.023\times 10^{23}molecules[/tex]
Did they scientist believe in God
Answer:
some of them not believe in God
A sample of solid X is carefully weighed and put inside a sealed flask. Pure hydrogen gas is added to the flask, and the mixture heated until the hydrogen starts being consumed. After hydrogen stops being consumed, the contents of the flask are removed and weighed, and from the increase in weight the value of may be calculated.
The following are the correct decisions;
1) Chemical property
2) Physical property
3) Chemical property
The question is incomplete, the complete question is;
Experiments were done on a certain pure substance X to determine some of its properties. There's a description of each experiment in the table below. In each case, decide whether the property measured was a chemical or physical property of X, if you can. If you don't have enough information to decide, choose can't decide in the third column. property experiment physical or chemical? Х O physical 0 A sample of solid X is carefully weighed and put inside a vented flask. The flask is heated until oxygen gas starts being produced. After no more oxygen gas is produced, the contents of the flask are removed and weighed, and from the decrease in weight the value of O may be calculated. O chemical O (can't decide) O physical V A sample of X is melted and put into a reservoir from which a very thin tube leads down. The rate at which X flows out of the tube is measured, and from this rate the value of V may be calculated. chemical (can't decide) O physical Q A sample of solid X is carefully weighed and put inside a sealed flask. Pure hydrogen gas is added to the flask, and the mixture heated until the hydrogen starts being consumed. After hydrogen stops being consumed, the contents of the flask are removed and weighed, and from the increase in weight the value of may be calculated. O chemical O (can't decide)
A chemical property is one in which atoms of a substances are rearranged in the process. In the first case, the substance was heated and oxygen was produced. This is a decomposition reaction hence it is a chemical property that is being measured.
In the second case, the molten substance is made to flow and the flow rate is measured. The flow rate of a substance is a physical property.
In the third case, hydrogen combines with an element in the flask. This is a chemical property.
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3. What is the best explanation for the decrease in first ionization energy moving from Be to B?
(A) Moving from Be to B, more electrons are added to the
atoms, thus increasing the electron-electron repulsions.
(B) Moving from Be to B, more protons in the nucleus
attract the valence electrons, making it harder to remove
the electrons.
(C) The electrons in Be are being removed from a full sub- shell, which is more stable than the half-filled sub-shell in B.
(D) The electrons in Be are located in the 2s subshell. These electrons penetrate closer to the nucleus than the 2p electrons in B.
Answer:
The electrons in Be are located in the 2s subshell .These electrons penetrate closer to the Nucleus than the 2p electrons in B
Explanation:
See the Electronic Configurations
[tex]\\ \sf\longmapsto Be=1s^22s^2[/tex]
[tex]\\ \sf\longmapsto B=1s^22s^22p^1[/tex]
2s orbitals are more powerful than 2p orbitals.The best explanation for the decrease in first ionization energy moving from Be to B is option d. The electrons in Be are located in the 2s subshell.
The Explanation for reducing the first ionization energy:When there is reduction in the first ionization energy that moved from be to B so here the electrons in Be should be located in the 2s subsell.
Also, these electrons should penetrate closer to the nucleus as compared to the 2p electrons in B.
Hence, the option d is correct.
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What is the atomic number of all Calcium Isotopes?
Answer:
all calcium atoms have an atomic number of 20 but there are three isotopes of calcium - 39, 40, and 42
The rate law of the overall reaction A + B → C is rate = k[A]2. Which of the following will not increase the rate of the reaction?
a. increasing the concentration of reactant B
b. adding a catalyst for the reaction
c. increasing the concentration of reactant A
d. increasing the temperature of the reactant
e. all of these will increase the rate
To solve this we need to have knowledge of experimental rate law which relates the rate to the concentration raise to some power. Therefore, the correct option is option A that is increasing the concentration of reactant B.
What is rate law?A rate law represents the rate of a reaction . According to this rate is directly proportional to the concentration of reactants. There is another expression of rate law which is integrated rate law which is just opposite of differential rate law.
The experimental rate law for given reaction is given as:
Rate = rate = k[A]²
To not to increase the rate of the reaction, we need to increasing concentration of B as there is no concentration of B in the rate law expression. Rate is independent of concentration of B.
Therefore, the correct option is option A that is increasing the concentration of reactant B.
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Mixture of oil and water heterogeneous?give reasons.
Answer:
because mixed particles are visible in this mixture.
Answer:
Oil and water do not mix, instead forming two distinct layer called phase. The oil phase is less dense than the water phase, and so the oil floats on top of the water.
The gas laws explain how __ gases ___ . There is actually no such thing as an ideal gas, but these laws still explain generally how gases behave. The separate laws combine into an “_____”.
what’s the missing blanks ?
The gas laws explain how ideal gases are . There is actually no such thing as an ideal gas, but these laws still explain generally how gases behave. The separate laws combine into an equation ”.
Hope it helps you...
Answered by Benjemin
how many molecules are in 3.8 grams of c6h6
Answer:
i dont really know how to explain but its the math
Explanation:
296.8249919999934
Answer:
Molar mass of benzene [C6H6] = (12 × 6) + (6 × 1)
= 78 grams
from avogadro's number:
[tex]78 \: g \: of \: benzene = 6.02 \times {10}^{23} \: molecules \\ 3.8 \: g = \{ \frac{3.8 \times (6.02 \times {10}^{23}) }{78} \} \\ \\ = { \boxed{ \boxed{2.93 \times {10}^{22} \: molecules}}}[/tex]
How are thermal energy, particle motion, and temperature related?
Thermal energy of a substance is obtained by absorbing temperature. Thermal energy is increased by the particle motion where an increase in kinetic energy is followed by an increase in thermal energy.
What is thermal energy?Thermal energy is a form of energy gained by the absorption of temperature and results in thermal expansion of particles. As the temperature increases, the particles gains sufficient energy to move apart.
Thus, kinetic energy of molecules increases by thermal expansion. Thereby volume of the system increases. Kinetic energy is the energy generated by virtue of the motion of particles in an object.
According to kinetic theory of gases kinetic energy of particles increases with an increase in thermal energy and vice versa.
Therefore, it can be said that the thermal expansion of particles is caused by the kinetic energy gained by them which is acquired by the thermal energy gained by the particles through the absorption of temperature.
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GET IT RIGHT FOR BONUS
Filtration is the most appropriate method for separating a solution of water and which substance?(1 point)
salt
sand
sugar
alcohol
Answer:
Sand
Explanation:
with salt distillation will work, heat the solution and collect the water in a seperate beaker
With sugar you do the same, boil away the water and collect the water vapour, you'll be left with sugar in the original container and water if you collected it
Use a fraction of column and heat the solution, the alcohol will be seperated out
Sand is the only one that uses mechanical filtration
Please help (20 points)
Answer:
universe, galaxy, solar system, planet
An unknown compound has the following chemical formula: where stands for a whole number. Measurements also show that a certain sample of the unknown compound contains of magnesium and of chlorine. Write the complete chemical formula for the unknown compound.
Answer: This is only a guess: The "following chemical formula: " doesn't appear on my screen. But since you mentioned Mg and Cl, I would guess MgCl2
Explanation: Mr loses 2 electrons while each Cl gains one each: Two chlorines for every 1 magnesium.
Place the following gases in order of increasing average velocity at 300 K: Ar, CH4, N2, and N2O.
a. Ar = CH4 = N2 = N2O
b. N2O < Ar < N2 < CH4
c. N20 < N2 < CH4 < Ar
d. Ar < N2 < N2O < CH4
e. CH4 < N2 < N2O < Ar
At 300 K, The gases in order of increasing average velocity will be N2O < Ar < N2 < CH4
The molecular mass of of a gas is directly proportional to its Molecular Velocity. That is to say that Gases made up lighter molecules will have greater high-speed particles and relatively higher velocities while . Gases made up of heavier molecules have greater low-speed particles, and relatively lower velocities.
Therefore considering the gases
N20 with 44.013 g/mol , Ar with 39.948g/mol N2 with 28.0134 g/mol CH4 with 16.04 g/molThe order of increasing average velocity at 300K will be N2O < Ar < N2 < CH4
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What is the mass of the silver sphere in kg?
Could someone help me name this compound?
Answer:
the answer is ethanedioc acid
Answer:
Notice the double carboxy group(COOH)
Since There's two carbons
The Name of this compound is
Ethanedioic acid✅.
Some insects, like bees, can see light of shorter wavelengths than humans can see. What kind of radiation do you think a bee sees?
Answer:
ultraviolet light (UV light)
One afternoon, a man painted his house brown. Two days later, however, the house caught fire and burned down. What two changes occurred to the house?
The painting was a physical change and the burning was a chemical change
Both painting and burning were physical changes
Neither physical nor chemical changes occurred
The painting was a chemical change and the burning was a physical change
Answer:
the painting was physical and burning chemical
the idea that atoms are indivisible explains all of the following except which of the following
Answer:
ll matter is composed of extremely small particles called atoms.
Atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass, and other properties.
Atoms cannot be subdivided, created, or destroyed.
Atoms of different elements can combine in simple whole number ratios to form chemical compounds.
In chemical reactions, atoms are combined, separated, or rearranged.
Each atom is uniform, homogeneous, colorless, tasteless, and indivisible.ll atoms of a given element are identical in mass and properties. Compounds are formed by a combination of two or more different kinds of atoms. A chemical reaction is a rearrangement of atom.
The basic idea that atoms are indivisible implies that atoms cannot be divided into any known smaller fractions.
Why are atoms indivisible?John Daltons theory of matter was based on the law of conservation of mass and the law of constant composition. The first part of his theory states that all matter is made of atoms, which are indivisible.
The basic idea that atoms are indivisible implies that atoms cannot be divided into any known smaller fractions. That is atom is the simplest form of any element.
However, atoms are not indestructible and it can be observed in radioactivity.
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fill the blanks :
a standing wave can only exist when the.....path around the nucles accommodates a certain number of.......
1.orbit
2.wavelength
3.frequency
4.electrons
5.radiation
Answer:
Hi, Friend!
My Answer would be Number 3 Frequency
Explanation:
Frequency describes the number of waves that pass a fixed place in a given amount of time.
Convert 5.15 meters to inches
Answer:
202.76 inches
Explanation:
1 meter = 39.37 inches
5.15 × 39.37 = 202.7559,when rounded it's 202.76
how do chemical characteristics of rocks effect water
Answer:
Freezing water can break rock without any change in the minerals that form the rock
Explanation:
Hope this helps→←Which part of the Periodic Table of the elements is used to identify valence electrons? *
Answer: Groups
Explanation:
The number of valence electrons of an element can be determined by the periodic table groups in which the element is categorized
P.S. Families rows in the table!
temperature at which the substance changes from solid to liquid is known as the:
Answer:
it is called the melting point
Of the following, which compound has the highest boiling point? Hexanone Hexanoic acid 1-Hexanol Hexanal
88.06 meters to centimeters
Answer:
8806cm
Explanation:
* by 100
8806cm
what is the mass of an object that has a density of 8 g/cm3 and a volume of 12 cm3
Answer:
96 grams
Explanation:
Density = mass / volume Multiply both sides by the volume
density * volume = mass
mass = 8 g / cm^3 * 12 cm^3
mass = 96 grams
What are the transitional elements?
Answer:
Transitional element are those elements which partially fill D and F subsells.
Answer:
an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital
Identify the contents of the following mixtures. Select all that apply. Each circle is an atom. Different colors are used for different types of atoms. Indicate atoms only for atoms not bound to other atoms. Please remember that the elemental form of some materials is simply the atom itself.
Answer:
What’s the question
Explanation:
Archer is a soil scientist and needs to examine a bacteria sample. He wants to be able to change his magnification with different objective lenses. Which microscope should he choose?
A. Compound light microscope
B. Transmission electron microscope
C. Dissecting microscope
D. Scanning electron microscope
Answer:
C. Dissecting microscope
Explanation:
It is trying to see the surface
