Answer:
Calcium
Explanation:
Hi!
So, the best way to solve this is with a period table with all of the sublevels labeled. (check below)
So the s sublevel starts at 1s which is Hydrogen. If you go down 4 rows, or periods, you get to sublevels 4s. As you should know, as you go across groups/columns, the valence electrons get higher. So the element that you are looking for has 2 valence electrons. So, the element you are looking for should be 4 down and 1 right of Hydrogen which is: Calcium
I hope I helped and have a wonderful evening!
Answer:
The partial pressure of the gas produced by the reaction is 0.9187 atm
Explanation:
Given;
vapor pressure of water,
= 0.0313 atm
measured atmospheric pressure,
= 0.950 atm
partial pressure of the gas produced by the reaction = ?
According to Dalton's law of partial pressure; total pressure is equal to sum of partial pressure of water vapor and gas produced.

= 
= 0.95 - 0.0313
= 0.9187 atm
Therefore, the partial pressure of the gas produced by the reaction is 0.9187 atm
Answer :
For a given reaction to take place, there might be at least one of these (7) signs;
- formation of gas bubbles, formation of a precipitate (creation of a solid from a solution), a change in color, a change in volume (due to change in density), a change in temperature (endothermic or exothermic), change in taste or smell and emission of light or fire..
Answer:
A. When two aqueous solutions are mixed, a precipitate is formed.
Explanation:
The precipitate (a solid substance that falls from the liquid) is the result of a chemical reaction taking place between the liquids.
The other three answer choices are indicative of physical changes (temperature change, phase change, color change).
Explanation:
The given reaction is as follows.

The number of elements on reactant side are as follows.
The number of elements on product side are as follows.
Therefore, the equation is completely balanced.
Thus, we can conclude that only one formula units of calcium chloride must be part of the products.