Answer: In an open system the vapor pressure is equal to the outside air pressure.
Explanation:
An open system is a system that is capable of exchanging both matter and energy with its surroundings.
For example, a hot cup of coffee is an open system as the cup is not covered with a lid. Therefore, heat energy from the coffee goes into the surroundings.
Vapor pressure is defined as the ability of a substance to change into vapor state. pressure
Therefore, we can conclude that in an open system the vapor pressure is equal to the outside air pressure.
Answer:
B. The temperature of object A is higher than that of object B.
Explanation:
Thermal energy always transfers from hotter object to colder one. Temperature indicates the hotness and coldness of a body. In a hotter body, molecules move faster and thus, their average kinetic energy would be greater.
If thermal energy will transfer from object A to object B, then the temperature of object A would be higher than that of object B. Also, its molecules would move faster and would have greater average kinetic energy.
Answer:
TRUE: The equivalence point is where the amount of acid equals the amount of base during any acid-base titration.
Explanation:
The point on the titration curve where the number of base equivalents added equals the number of acid equivalents is the equivalence point or neutralization point.
Chemical indicators are substances that change color thanks to a chemical change, depending on the pH of the medium, and thus indicate the end point or point of equivalence of an acid-base volumetry.
A titration curve occurs by representing the measured pH as a function of the added volume of titrant, where the rapid change in pH for a given volume is observed. The inflection point of this curve is called the equivalence point and its volume indicates the volume of titrant consumed to fully react with the analyte.
In some cases, there are multiple equivalence points that are multiples of the first equivalence point, as in the valuation of a diprotic acid, which indicates that its pH value will not always be 7.
Answer:
As we move from left to right across a period, the ionization energy of elements increases. This is due to the decrease in the size of atoms across a period.