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german
3 years ago
7

During a lab activity, students prepared two solutions separately at the same temperature. Later they mixed the solutions and th

e temperature dropped. Why?
Chemistry
1 answer:
tino4ka555 [31]3 years ago
7 0
This at be due to a chemical change. For example, when some chemical elements mix, the change causes heat. This is the same, but the opposite. Hope this helps!
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Answer:

CI706

Explanation:

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Scientists classify rocks into three different types. What is the main basis for the classification system they chose? color of
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A compound is 53. 31% c, 11. 18% h, and 35. 51% o by mass. What is its empirical formula? insert subscripts as needed.
lyudmila [28]

Answer:

C2H5O

Explanation:

In a 100 g sample we would have

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11.18g of H

35.51g of O

First, we find the relative number of atoms of each element by dividing the number of grams the element has in the compound by its atomic mass.

Atomic mass of carbon is 12.011

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Atomic mass of hydrogen = 1.007

Relative number of hydrogen atoms : 11.18/1.007 = 11.1

Atomic mass of oxygen : 15.999

Relative number of oxygen atoms : 35.51 / 15.999 = 2.2


Now we find a ratio of the relative number of atoms by dividing the # of relative atoms of each element by the element's relative number of atoms that had the lowest number. ( oxygen which had 2.2 ) The outcome of each will be the subscript or number of atoms of each element.

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Hydrogen : 11.1 / 2.2 = 5

Oxygen : 2.2 / 2.2 = 1

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2 years ago
What elements are highlighted:<br> a. Nonmetals<br> b. Metals<br> C. Metalloids
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