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Margarita [4]
3 years ago
5

What is the definition for exothermic and endothermic energy?

Chemistry
1 answer:
kozerog [31]3 years ago
8 0
Exothermic<span>- the word describes a process that releases </span>energy<span> in the form of heat. Forming a chemical bond releases </span>energy<span> and therefore is an </span>exothermic<span> process. </span>Exothermic<span>reactions usually feel hot because it is giving heat to you. </span>Endothermic<span> - a process or reaction that absorbs </span>energy<span> in the form of heat.</span>
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Which of the following expressions best represents a second order rate law?
Ksivusya [100]
I think the correct answer would be C. The expression that would best represent a second order rate law would be r =k[X][Y]. Reaction with this rate law are those that depend on the concentration of two first order reactants or a second order reactant.
8 0
3 years ago
An atom was observed with +3 charge, n = 38, and e = 28. What is the mass number of the atom?
Finger [1]

Answer: 66

Explanation: To find the mass number you would have to add the number of protons and the number of neutrons.

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Both __________ and __________ can be classified as pure substances because they have distinct properties and composition.
musickatia [10]

Answer:

Both <u>elements </u>and <u>compounds</u> can be classifies as pure substances because they have distinct properties and composition.

Explanation:

Elements and compounds are considered as pure substances because both are always formed form are have same kind of atoms.

For example,

Carbon dioxide is compound. It always consist of one carbon atom and two oxygen atoms.

Water is compound it always have same kind of atoms two hydrogen and one oxygen that's why compounds are considered as pure substances.

Same is the case with elements. For example,

Hydrogen is element and it always consist of H atoms.

Iron is another element and it always have iron atoms.

So elements and compounds are always consist of same substances that's why they are considered as pure.

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Given the balanced equation, how many moles of sulfur trioxide are produced from 160 grams of oxygen ?
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