Answer:
True
Explanation:
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.
Answer:
A
Explanation:
an element contains only one kind of particle
Answer:
Explanation:
A solar collector is a device that absords Sun's heat energy to heat air or water. It is majorly used for heating purpose, and do not generate electricity directly.
The flow tubes and collector plate are black in color so as to increase the intensity of heat generated by the collector. A black body is a good absorber of heat, it absorbs most heat directed to the collector. Also, a black body is a good radiator of heat, the heat absorbed is rediated to the appropriate channels for the heating of water or air molecules. The black color increases the efficeincy and percentage of solar energy absorbed by the collector.
If a reflective color is used (e.g white), major percentage of the incident heat would be reflected. This would decrease the efficiency of the solar collector.
Answer:
26.899 g of Li
Solution:
The Balance Chemical Equation for given reaction is as follow;
6 Li + N₂ → 2 Li₃N
According to equation,
69.66 g (2 mol) Li₃N is produced by = 41.64 g (6 mol) of Li
So,
45.0 g of Li₃N will be produced by = X g of Li
Solving for X,
X = (45.0 g × 41.64 g) ÷ 69.66 g
X = 26.899 g of Li
Hence, 26.9 g of Lithium is required to produce 45.0 g of Lithium Nitride.