The density of Argon gas at a pressure of 753 mmHg and a temperature of 35 °C is equal to 1.59 g/L.
The state of a quantity of gas is calculated by its pressure, volume, and temperature. The ideal gas law can be explained as the product of the volume and pressure of gas is equal to the multiplication of the universal gas constant and absolute temperature.
The mathematical equation for an ideal gas can be written as follows:
PV = nRT
PV =(m/M) RT
PM/RT = m/V
d = PM/RT
Where n is the moles of gas, T is the temperature of the gas, V is the volume of the gas, and R is the gas constant.
Given, the temperature of argon gas, T = 35 °C = 35 +273 = 308 K
The pressure of the argon gas, P = 753 mmHg = 1.01 atm
The molar mass of the Argon gas, M = 40 g/mol
Substitute V, R, P, and T in the ideal gas equation, we get:
The density of Argon gas, d = PM/RT
d= 1.01 ×40/(0.082 × 308)
d = 1.59 g/L
Therefore, the density of Ar gas is 1.59 g/L.
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The substance that turns blue litmus red should turn methyl orange to red because it is an acid.
An acid is a substance that produces hydrogen ions as the only positive ions when dissolved in water.
Properties of acid include :
Therefore, the substance that turns blue litmus red is an acid:
It should turn methyl orange to red because it is an acid.
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If the nucleus was the size of a tennis ball, the atom would be the size of a sphere about 1,450 feet in diameter.
The size of one atom would be comparable to one of the world's largest sports stadiums if the nucleus were the size of a tennis ball, or around 1,450 feet in circumference.
There are protons, neutrons, and electrons, three types of subatomic particles. Protons and electrons, two of the subatomic particles, each carry an electrical charge of one or the other.
Electrically charged protons and electrically neutral neutrons make up atomic nuclei. The strongest basic force known to science, often known as the strong force, holds these things together.
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b. CH₃CH(Br)CH(Br)CH₃
c. CH₃CH₂CH(Br)CH₃
d. CH₃CH₂CH₂COOH
e. CH₃CH₂CH₂CH₃
(2) Cu(s) + 2AgNO3(aq) ==>2Ag(s) + Cu(NO3)2(aq)
(3) 2H2(g) + O2(g) ==>2H2O(l)
(4) KOH(aq) + HCl(aq) ==>KCl(aq) + H2O(l)
Answer : The correct option is, (1)
Explanation :
The option (1) reaction is an example of decomposition reaction because in this reaction the larger compound, calcium carbonate decomposes into smaller molecule, calcium oxide and carbon dioxide.
Decomposition reaction : It is a type of reaction in which a larger compound decomposes into a smaller molecule or elements.
The option (2) reaction is an example of single displacement reaction because in this reaction the most reactive metal, copper displace the less reaction metal, silver.
The option (3) reaction is an example of combination reaction because in this reaction two reactants, hydrogen and oxygen react to give a single product as water.
The option (4) reaction is an example of double displacement reaction because in this reaction a positive cation and a negative anion of two reactants exchange their places to give two new products.
Hence, the correct option is, (1)
(2) melting and evaporating
(3) condensation and sublimation
(4) condensation and deposition
Melting and evaporating are the physical changes that are endothermic. Therefore, the correct option is option 2.
Physical modifications are those that modify a chemical substance's shape yet do not affect its chemical content. Physical changes may normally be utilised to separate compounds to chemical elements and simpler compounds, but they cannot be utilised for separate mixtures to their individual components. When something changes physically but not chemically, it is said to have undergone a physical transformation. This contrasts to the idea of a chemical change, when a material's composition changes or a substance or substances mix or separate to generate new compounds. Melting and evaporating are the physical changes that are endothermic.
Therefore, the correct option is option 2.
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