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Alex73 [517]
2 years ago
15

Bats,birds,and people evolution. Help

Chemistry
1 answer:
Troyanec [42]2 years ago
6 0

Answer:

i dont understand ... whats the question?

Explanation:

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Why do some substances react with each other while others do not
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20.00 g of aluminum (al) reacts with 78.78 grams of molecular chlorine (cl2) all of each reactant is completely consumed and a s
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The mass of the product is <em>98.78 g.</em>

The word equation is

aluminum + chlorine → product

20.00 g + 98.78 g → <em>x</em> g

If each reactant is completely consumed, the <em>Law of conservation of Mass </em>tells us the mass of the product must be 98.78 g.

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2 years ago
Read 2 more answers
815 cal of heat is added to 5.00 g ice at –20.0 °C. What is the final temperature of the water?
deff fn [24]
The amount of heat needed to raise the temperature of an object is obtained through the equation,
                                       H = m(cp)(20) + m (heat of fusion) + m(cp) (dT)
where H is heat, m is mass, cp is specific gravity, and dT is the change in temperature. The specific gravity of water is 0.5 cal/g.C. The third term is for water and cp is equal to 1 cal/g.C. Substituting the values,
                     815 cal = (5 g)(0.5 cal/g.C)(20C) + (80 cal/g)(5 g) + 5(1)(T2)
The value of T2 is 73 degrees C. 
4 0
2 years ago
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