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kupik [55]
3 years ago
15

Ng.

Chemistry
1 answer:
Kipish [7]3 years ago
4 0
They make finding things easier so we plug abs don’t need to go on the other planets and can just send the -robots
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What is hybridization in chemistry? Give some example
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Co2,so2

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4 years ago
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Which of the following processes is endothermic? Group of answer choices water droplets condensing on a soda can on a hot summer
fgiga [73]

Answer: an ice pack getting cold (due to ammonium nitrate dissolving in water inside the pack)

Explanation:

Endothermic reactions: These are the reactions in which energy is required in the reaction. The energy of the products are more than the energy of the reactants.

Exothermic reactions: These are the reactions in which energy is released in the reaction. The energy of the products is less than the energy of the reactants.

a) water droplets condensing on a soda can on a hot summer day : As the gaseous molecules are changing into liquid phase, energy is released and is exothermic

b) an ice pack getting cold (due to ammonium nitrate dissolving in water inside the pack) : As the temperature is decreasing , energy is absorbed by the surroundings and thus is endothermic

c) thermite reaction between iron(III) oxide and aluminium (spectacular flames are observed)  : As flames are produced, the energy is released and thus is exothermic

d) freezing water to make ice cubes  : As the liquid molecules are changing into solid phase, energy is released and is exothermic

4 0
3 years ago
The maximum level of lead allowed in drinking water is 15 mg/kg. What is this concentration in units of parts per million?
Alecsey [184]
15 ppm
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1.5 × 104 ppm
3.1 ppm
1.5 × 10-2 ppm
6 0
3 years ago
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