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vova2212 [387]
4 years ago
6

What is the evidence of a chemical reaction when the fireworks go off

Chemistry
1 answer:
Mnenie [13.5K]4 years ago
6 0
When fireworks go off, they produce smoke, which is evidence of a new substance being created.

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In Earth Science, what are tiered cosmos?
777dan777 [17]

Answer:

The concept of a tiered cosmos is important for an understanding of the meaning of megalithic structures. ... That includes the physical world, but also religious concepts. An important feature of most (if not all) religions is a tiered cosmos: Many cultures know separate realms for  death and living.

6 0
3 years ago
Two diseases wiped out by vaccines are what and what
Olenka [21]
One of the diseases is smallpox and the second is rinderpest
3 0
2 years ago
How many electrons make up a charge of -50.0 μc ? Express your answer using three significant figures?
SVETLANKA909090 [29]

The charge on one mole of electrons = 96485 C =  1 Faraday

so if charge is 96485 C the moles of electrons are 1 = 6.023 X 10^23 electrons

if charge is 1 C the number of electrons = 6.023 X 10^23 / 96485

If charge is 50 micro C the number of electrons

              = 6.023 X 10^23 X 50 X 10^-6 / 96485

             = 3.12 X 10^14 electrons


5 0
3 years ago
Read 2 more answers
How many moles of Mg are present in 62.23 grams of Mg? (Show your calculations for full credit.)
mylen [45]
62.23 = 1512.5001499999998 moles
5 0
3 years ago
For each bond, show the direction of polarity by placing a + sign next to the atom expected to have a partial positive charge an
Anna11 [10]

Answer:

A) { + } Ge-Se { -}

B) { + } Ge-Br { - }

C) { - } Br-Se { + }

Explanation:

The (-)ive sign shall be placed for the atom with higher electronegativity, while the other atom will be electropositive.  

a) Electronegativity of Ge = 2.01

Electronegativity of Se = 2.55

{ + } Ge-Se { -}

b) Electronegativity of Ge = 2.01

Electronegativity of Br = 2.95

{ + } Ge-Br { - }

c) Electronegativity of Br = 2.95

Electronegativity of Se = 2.55

{ - } Br-Se { + }

8 0
3 years ago
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