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Ede4ka [16]
3 years ago
5

A firework exploding would be an example of a(n) ________. Question 23 options: Exothermic reaction Endothermic reaction Physica

l change Formation of a precipitate
Chemistry
2 answers:
sesenic [268]3 years ago
8 0

Answer is: Exothermic reaction.

Exploding fireworks is chemical change (chemical reaction), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change (energy is released).

There are two types of reaction: endothermic reaction (chemical reaction that absorbs more energy than it releases) and exothermic reaction (chemical reaction that releases more energy than it absorbs).

Readme [11.4K]3 years ago
7 0
They are Exothermic reaction





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How many atoms of oxygen are present in 7.51 grams of<br> glycine with formula C₂H5O2N?
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1.205 × 10²³ atoms of oxygen will be present in 7.51 grams of glycine with formula C₂H5O2N. Details about number of atoms can be found below.

How to calculate number of atoms?

The number of atoms of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number.

However, the number of moles of oxygen in glycine can be calculated using the following expression:

Molar mass of C₂H5O2N = 75.07g/mol

Mass of oxygen in glycine = 32g/mol

Hence; 32/75.07 × 7.51 = 3.2grams of oxygen in glycine

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Therefore, 1.205 × 10²³ atoms of oxygen will be present in 7.51 grams of glycine with formula C₂H5O2N.

Learn more about number of atoms at: brainly.com/question/8834373

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