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Nana76 [90]
2 years ago
7

Why isn’t a state change from liquid to solid a chemical reaction?

Chemistry
2 answers:
kipiarov [429]2 years ago
4 0

Answer:

because the change can be undone with a chemical change the change cant be undone, and it just passes through another phase of matter. Changes of matter can consider physical

Explanation:

DanielleElmas [232]2 years ago
3 0

Answer:

nosé ehhhye eee p nosé inglés

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Identify which one of the three methods of analysis (i.e., TLC, IR and melting point) provides information about the structure o
Alex787 [66]

Answer:

IR provides structural information about a molecule. TLC and melting point analysis do not provide structural information.

Explanation:

IR gives information about the functional groups present in a molecule. The vibrational frequency of each functional group gives information about the structure of the entire molecule.

Structural features of a molecule are deduced by matching the vibrational frequencies of  groups obtained from the IR spectroscopy with that of known functional groups in literature.

Melting point is a qualitative method that can only yield information about the identity of a compound and not its structure. Each compound has its unique melting point recorded in literature and any pure sample of the same compound must have the same sharp meting point.

Thin-layer chromatography (TLC) is a chromatography technique used to separate non-volatile mixtures. After separating the components of the mixture, it does not give any information regarding the identity or the structure  of the components of the mixture.

Therefore, only IR yields structural information about a sample.

6 0
2 years ago
Why does an oil-and-vinegar salad dressing have two separate layers?
Olegator [25]
This is because no matter how hard you try to shake or combine the oil and vinegar<span> together, they eventually </span>separate<span>. This happens because </span>vinegar<span> and </span>oil<span> are made of very different types of molecules that are attracted to their own kind.</span>
4 0
3 years ago
Chang described two substances which participate in photosynthesis.
Ede4ka [16]

Substance A is Chlorophyll and substance B is Oxygen

8 0
3 years ago
Consider the reaction below:
IRINA_888 [86]
What are <span>stoichiometry equations?</span>
5 0
2 years ago
How many grams of magnesium oxide can be produced when 125 g Mg react with 102 g O2?
4vir4ik [10]
Balanced Equation: 2Mg + O2 ➡️ 2MgO
125 x 2= 250 102 x 2= 204
250 + 204= 454
So the answer should be 454 grams of magnesium oxide should be produced.
4 0
3 years ago
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