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Anna71 [15]
3 years ago
10

What are the extremely small particles that all elements are composed of?

Chemistry
2 answers:
muminat3 years ago
7 0
Atoms is the correct answer
Romashka-Z-Leto [24]3 years ago
7 0
Atoms is the correct answer
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How many atoms are in 1 mole of hydrogen
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Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron?
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3 years ago
The bonds in the reactants of Figure 7-3 contained 372 kJ of chemical energy and the bonds in the products contained 350 kJ of c
satela [25.4K]

Answer: 22 kJ amount of energy is released in the following reaction.

Explanation: There are two types of reaction on the basis of amount of heat absorbed or released.

1. Endothermic reactions: These are the type of reactions in which reactants absorb heat to form the products. The energy of the reactants is less than the energy of the products.

2. Exothermic reactions: These are the type of reactions in which heat is released from the chemical reactions. The energy of the products is less than the reactants.

Sign convention for \Delta H: This value is negative for exothermic reactions and positive for endothermic reactions.

For the given chemical reaction,

Energy of the products is less than the energy of the reactants, Hence, this reaction will be a type of exothermic reaction and energy will be released during this chemical change.

Amount of energy released = (350 - 372) kJ = -22kJ

Negative sign symbolizes the energy is being released. So, 22 kJ amount of energy is released in the following reaction.

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2 years ago
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