Answer: The resulting mass would be 35 grams.
Explanation: Mass cannot be destroyed, there would be no need to re-measure the mass. Therefore, if we add the masses we get 35.
Static electricity just did the test
The number of moles that are 1.50 x10^23 molecules of NH3 are
=0.249 moles
calculation
The number of moles is calculated using Avogadro's law constant
that is According to Avogadro's law
1 moles of a substance = 6.02 x10^23 molecules
? moles = 1.50 x10^23 molecules
by cross multiplication
= [( 1.50 x 10^23 molecules x 1 moles) / (6.02 x10^23)] = 0.249 moles
Answer:
Magnet
Durability and heaviness.(texture)
Explanation:
Magnet can be use to separate Aluminum from mixture of steel and aluminum.
Though aluminum and steel look alike but magnet can be use to separate it.
If the can attract the magnet or magnet stick to the can, it is a steel can. Aluminum does not stick to magnet.
A mixture of Aluminum and tin can also be separated by magnet.
Tin attract magnet but tin is more durable, heavy and does not corrode easily.
When u touch the three cans, tin is heavy and durable.
(2) ethanol (4) water
The compound that has the lowest vapor pressure is ethanoicacid. The correct option is 1.
Vapor pressure is a measure of a material'stendency to change into a gaseous or vapor state, and it rises with temperature.
The boilingpoint of a liquid is the temperature at which the vapor pressure at its surface equals the pressure exerted by its surroundings.
A liquid with weak intermolecularforces evaporates faster and has a higher vapor pressure. A liquid with stronger intermolecular forces is more difficult to evaporate and thus has a lower vapor pressure.
At 50°C, ethanoloicacid has the lowest vapor pressure, which is 0.08 atm. Propanone has a vapor pressure of 0.84 atm at 50°C. At 50°C, ethanol has a vapor pressure of 0.30 atm.
Thus, the correct option is 1.
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Answer : Option A) Ethanoic Acid
Explanation : Ethanoic acid has the lowest vapor pressure i.e 0.08 atm at the temperature of 50°C compared to the other given options.
The vapour pressure of propanone at 50°C is 0.84 atm
Ethanol has vapour pressure as 0.30 atm at 50°C
water has vapour pressure of 0.12 atm at 50°C.
Dalton recognized that tiny atoms combined to form complex structures.
B
Dalton recognized the presence of electrons around a nucleus.
C
Dalton recognized the presence of protons in the nucleus.
Answer:
endothermic, causing an increase in the kinetic energy of the water molecules.
(exothermic, causing an increase in the kinetic energy of the water molecules.)
exothermic, causing an increase in the kinetic energy of the solute particles.
The reaction is exothermic, causing an increase in the kinetic energy of the water molecules.
• In a calorimeter when the reaction takes place, and there is an increase in temperature recorded in the thermometer, it shows that the reaction is emitting heat to the surrounding, and such kind of reactions is known as exothermic reaction.
• With the mixing of aqueous solution of HCl and NaOH the temperature of the solution increases, this shows that the kinetic energy of the water molecules increases. As, kinetic energy is directly proportional to the temperature.
• With increase in temperature, the collision or vibration of molecules increases, thus, there is an increase in the kinetic energy between the molecules.
Thus, the reaction is exothermic, causing an increase in the kinetic energy of the water molecules.
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