Answer:
Selenium
Explanation:
Electronegativity of Boron is 2.04
Electronegativity of Selenium is 2.55
Electronegativity of Beryllium is 1.57
We will assume that the only reactants are x and y and that the only product is xy.
Based on the law of mass conservation, mass is an isolated system that can neither be created nor destroyed.
Applying this concept to the chemical reaction, we will find that the total mass of the reactants must be equal to the total mass of the products,
therefore:
mass of x + mass of y = mass of xy
12.2 + mass of y = 78.9
mass of y = 78.9 - 12.2 = 66.7 grams
Answer:
The word "Halloween" comes from All Hallows' Eve and means "hallowed evening."
Halloween's origins can be traced back to the ancient Celtic festival known as Samhain, which was held on November 1 in contemporary calendars. It was believed that on that day, the souls of the dead returned to their homes, so people dressed in costumes and lit bonfires to ward off spirits.
Explanation:
Hello, there can be multiple answers to the question you did not really put up a paragraph of the answers so here's a few...
1. you drive a car because fumes can release into the air
2. using any motorized thing releases fumes which can be dangerous
3. foundries the smoke that comes up keep pollution in the air
Hope this helps!!