Answer:
This question is incomplete
Explanation:
This question is incomplete but the answer to (1) and steps involved in calculating (2) and (3) will be discussed in the attachment
1. The reaction is an exothermic reaction because heat was given off. Exothermic reaction is a reaction in which heat is released from a reaction into the surroundings. And according to the question, the student observed <em>that the temperature of the water increased during the course of the minutes.</em>
Answer:
The dependent variable is the cleanliness of the clothes.
Explanation:
The cleanliness of the clothes <em>depends</em> on the laundry detergent.
Hope this helps :)
-Adrien
Answer:
18 KJ
Explanation:
Data Given:
mass of Lead (m) = 21 g
Heat taken for vaporization (Q) = ?
Solution:
This problem is related to phase change and latent heat of vaporization.
Latent heat of vaporization is the amount of heat taken to convert one mole of substance at its boiling point to its vapor.
So, Latent heat of vaporization of lead has a constant value
Latent heat of vaporization of lead = 177.7 KJ/mol
Formula used
Q = m x Lv. . . . . (1)
where
Lv = specific latent heat of vaporization
here the value for latent heat of vaporization is for mole so instead of mass we will use moles in formula.
So,
Q = no. of mol x Lv. . . . . (2)
first find no. of moles for 21 g of lead
no. of moles = mass in grams / molar mass . . . . . . (3)
molar mass of lead (Pb) = 207 g/mol
put values in equation 3
no. of moles = 21g / 207 g/mol
no. of moles = 0.101 mol
so,
number of moles of lead (Pb) = 0.101 mol
Put values in the eq.2
Q = 0.101 mol x 177.7 KJ/mol
Q = 18 kJ
So, 18KJ of heat is taken to vaporize 21 g of lead (Pb)
Ammonia is the compound NH3
In order to maintain neutrality, the negatively charged ions in the salt bridge will migrate into the anodic half-cell. A similar (but reversed) situation is found in the cathodic cell.
<h3>
What purpose does a salt bridge serve in an oxidation process?</h3>
Anions (negatively charged particles) are added to the solution of the oxidation half of the cell by the salt bridge, and cations (positively charged particles) are added to the solution of the reduction half of the reaction.
<h3>
What purpose does the salt bridge serve in a galvanic cell?</h3>
For instance, KCl, AgNO3, etc. In a galvanic cell, such as a voltaic cell or Daniel cell, salt bridges are typically used. A salt bridge's primary job is to assist in preserving the electrical neutrality of the internal circuit. Additionally, it aids in keeping the cell's response from reaching equilibrium.
Learn more about Salt bridge here:-
brainly.com/question/20345420
#SPJ4
