1. To solve this we assumethat the gas inside the balloon is an ideal gas. Then, we can use the ideal gasequation which is expressed as PV = nRT. At a constant pressure and number ofmoles of the gas the ratio T/V is equal to some constant. At another set ofcondition of temperature, the constant is still the same. Calculations are asfollows:
T1 / V1 = T2 / V2
V2 = T2 x V1 / T1
V2 = 296.15 x 535 / 319.15
V2 = 496.44 mL
The mass of the products equals the mass of the reactants because energy is not absorbed or given off by the reaction.
The mass of the products is less than the mass of the reactants because energy is given off by the reaction.
The mass of the products equals the mass of the reactants because the same atoms are present throughout the reaction
(2) an isotope (4) a compound
Any substance composed of two or more elements that are chemically combined in a fixed proportion is known as a Compound. Thus, it's D.
Elements may be defined as any substance that cannot be disintegrated into more superficial substances by standard chemical processes.
In chemistry, an isomer may be defined as those molecules which the same molecular formulas, but different arrangements of atoms.
An Isotope may be defined as an atom that bears the same atomic number and chemical identities but possesses a different atomic mass.
A solution may be defined as a homogeneous mixture of one or more solutes disbanded in a specific solvent.
Therefore, the correct option for this question is D.
To learn more about Compounds, refer to the link:
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Complete question is;
Molding a shape from soft, malleable material (clay or plaster) or constructing a shape from harder material (such as metal or paper) is called what?
Molding is what a child does with Play-Doh or origami
Answer:
Modeling
Explanation:
In chemistry, we have a branch called modeling chemistry. In modeling, we organize together a series of models instead of a collection of topics. In this approach, we will begin with a phenomena that can be readily observed and are gradually develop the simplest model of matter that helps us make sense of our observations.
Now in the question, we are Molding a shape from soft, malleable materials like clay/plaster or constructing from harder materials like metal/paper. This means that we are organizing a series of models from either soft & malleable or harder materials to produce a simple model shape.
Thus, this is simply modeling.
We need to crack molecules in order for us to get the desired molecule. For example, in the extraction of crude oil, after entering the fractional distillation, it will give products base on their molecular structure. The products are gasoline, diesel fuel, jet fuel, wax, asbestos,kerosene.
Answer is: (3) 2–8–17–6.
1) This is ground state of sodum atom.
Electron configuration of sodium atom: ₁₁Na 1s² 2s² 2p⁶ 3s¹.
Atomic number of sodium is 11, it means that it has 11 protons and 11 electrons, so atom of sodium is neutral.
2) This is ground state of sulfur atom.
Sulfur electron configuration: ₁₆S 1s²2s²2p⁶3s²3p⁴.
Sulfur has six valence electrons (3s²3p⁴), in 3s orbital, two electrons are paired, in 3p orbital, two electrons are paired and two are unpaired.
4) This is ground state of arsenic atom.
Electron configuration of arsenic atom:
₃₃As 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p³.
Electron configuration represents an excited state : (3) 2–8–17–6
In an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
Charging electrons in the sub shell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
Determination of electron configurations based on principles:
According to Niels Bohr, electrons surround the nucleus of an atom on a path called the electron shell. Each shell has an energy level. The further from the core, the higher the energy level
Maximum electrons of shells :
The maximum number of electrons in each shell can be formulated = 2n² (n = shell number)
Electrons can move the shell up or down by releasing energy or absorbing energy
Excited electrons show higher electron transfer to the shell by absorbing energy
So it can be concluded that there are 2 conditions :
Ground state is the state of electrons filling skins with the lowest energy levels.
Excited state is the state of electrons which occupy a higher energy level
The state of excited electrons can be seen from the presence of electrons which do not fill the skin completely but fill the skin afterwards
From the electron configuration , option 3 shows the excitation of one electron in the M shell towards the N shell, which should have a configuration in the ground state:
2–8–18–5
element X
electrons and atomic orbitals
about subatomic particles statement
Keywords: electron configurations, the shell of atoms, excited state