A. C and C
B. C and O
C. H and C
D. H and O
The bond between hydrogen and oxygen has the greatest degree of polarity as there is wide electronegativity difference between the atoms.
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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The symbol of an isotope that atom of its element contains 50 electrons and 70 neutrons is Tin (Sn).
The Isotope may be characterized as one of two or more types of atoms of a chemical element that significantly have the same number of protons but with different numbers of neutrons and therefore different atomic masses.
In a more simple sense, an isotope may be defined as an atom that has the same atomic number but different atomic mass and physical properties.
According to the question,
The number of electrons an atom possesses = 50.
The number of neutrons = 70.
Since, the number of electrons = the number of protons = the atomic mass of an atom = 50.
∴ According to the periodic table, an element having an atomic number of 50 is known as Tin (Sn).
Its atomic mass = the number of protons + the number of neutrons.
= 50 + 70 = 120 amu.
Therefore, the symbol of an isotope that the atom of its element contains 50 electrons and 70 neutrons is Tin (Sn).
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Answer : Evaporative salts are majorly used as common salts or halites, which are highly and widely used to preserve foods, dye fabric, and de-ice roads.
Explanation : Evaporative salts are produced by evaporation of the sea water hence it is named as evaporative salts. These are mainly extracted through evaporation from seawater. The salts from shallow ponds where the seawater gets collected in a land, which is later harvested and then purified.
A.)He is correct. Dissolving salt in water is a physical change, but evaporating the water is a chemical change. Formation of a solid is evidence that a chemical change occurred.
B.)He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.
C.)He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.
D.)He is incorrect. Dissolving salt in water and evaporation of the water are both chemical changes. The reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.
Answer:
C.)He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.
Explanation:
From the analogy of the problem presented, we can see that Henry is grossly incorrect. His conclusion from the process of the experiment he carried out is completely wrong.
Physical changes are changes that alters the physical properties of matter particularly the form and state.
Chemical changes leads to the formation of a new kind of matter.
We can see that since the salt was obtained back after evaporation, no change has occurred to it.
Therefore, evaporation in itself is a physical change process.
Answer:
c on ed
Explanation:
To calculate the fuel value in kJ, convert nutritional calories to joules and then to kilojoules.
To calculate the fuel value in kJ, we need to convert the nutritional calories to joules and then to kilojoules. We can use the equation: fuel value (in kJ) = fuel value (in cal) x 4.184 / 1000. Given that the fuel value is 2.04 × 10⁻¹ nutritional cal, we can substitute it into the equation to get the fuel value in kJ.
fuel value (in kJ) = 2.04 × 10⁻¹ x 4.184 / 1000 =8.5288 x 10⁻³ kJ
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The boiling point of an aqueous solution is elevated due to the presence of a nonvolatile solute. The extent of the boiling point elevation depends on the total number of solute particles in the solution. The solution with the highest boiling point would be 0.100 m AlCl3 because it breaks down into the most ions in solution.
The subject of this question is boiling point elevation, a chemical concept that is most relevant to the field of chemistry. The boiling point of an aqueous solution is elevated due to the presence of a nonvolatile solute because the solute lowers the solution's vapor pressure, requiring a higher temperature for the solution to boil. The extent of the boiling point elevation depends on the total number of solute particles in the solution, rather than their individual properties such as mass or chemical identity.
Given the choices of 0.100 m C6H12O6, 0.100 m AlCl3, 0.100 m NaCl, and 0.100 m MgCl2, the solution with the highest boiling point would be 0.100 m AlCl3. This is because AlCl3, aluminum chloride, breaks down into four ions in solution (one Al3+ ion and three Cl- ions), whereas the other substances break down into fewer ions (C6H12O6 doesn't break down into ions at all, NaCl breaks down into two ions, and MgCl2 breaks down into three ions). The more ions a substance breaks down into, the higher the elevation of the solution's boiling point.
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Among the given solutions, the 0.100 m AlCl3 (aluminum chloride) solution should have the highest boiling point as it produces the most particles when it dissociates in the solution, according to the principle of 'boiling point elevation'.
The question asks to choose the aqueous solution with the highest boiling point among 0.100 m C6H12O6 (glucose), 0.100 m AlCl3 (aluminum chloride), 0.100 m NaCl (sodium chloride), and 0.100 m MgCl2 (magnesium chloride). The highest boiling point will be determined by the solution with the most particles, because as the number of particles increase, the boiling point will rise. This concept is part of 'boiling point elevation' in solutions.
Both NaCl and MgCl2 will dissociate into ions when dissolved in water, producing 2 and 3 particles respectively for each formula unit. Meanwhile, AlCl3 will produce 4 particles when it dissociates (Al3+ and three Cl- ions). Glucose is a covalent compound and will not dissociate when dissolved in water; hence it only counts as one particle.
Based on the number of solute particles, AlCl3 should have the highest boiling point as it produces the most particles when it dissociates in the solution.
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