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zysi [14]
3 years ago
6

Which of these BEST describes a physical change?

Chemistry
1 answer:
OLEGan [10]3 years ago
8 0

Answer:

C) a log in the campfire turns into ashes

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Lithium diisopropylamide (LDA) is used as a strong base in organic synthesis. LDA is itself prepared by an acid-base reaction be
kakasveta [241]

Explanation:

Lithium diisopropylamide (LDA) is used in many organic synthesis and is a strong base. It is prepared by the acid base reaction of N,N-diisopropylamine ( [(CH₃)₂CH]₂NH ) and butyllithium ( Li⁺⁻CH₂CH₂CH₂CH₃ ).

The equation is show below as:

[(CH₃)₂CH]₂NH + Li⁺⁻CH₂CH₂CH₂CH₃  ⇒  [(CH₃)₂CH]₂N⁻Li⁺  + CH₃CH₂CH₂CH₃

N,N-diisopropylamine ( [(CH₃)₂CH]₂NH ) is a weaker acid and hence,  LDA ( [(CH₃)₂CH]₂N⁻Li⁺ ) is stronger base. (Weaker acid has stronger conjugate base)

Butyllithium ( Li⁺⁻CH₂CH₂CH₂CH₃ ) is a very strong base and hence, butane ( CH₃CH₂CH₂CH₃ ) is a very weak acid. (Strong base has weaker conjugate acid)

5 0
3 years ago
HELP! Give the molar mass of Copper (II) Hydroxide.
yarga [219]

Answer:

97.561 g/mol

Explanation:

8 0
3 years ago
What is the effect of adding heat to a gas at constant pressure?
Anna007 [38]
The pressure will continue to build up eventually causing a release of pressure or an explosion.
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3 years ago
This element has an atomic number smaller than magnesium and 3 electrons in its valence shell
OverLord2011 [107]

Boron (B) is your answer.

6 0
3 years ago
The thermostat in a refrigerator filled with cans of soft drinks malfunctions and the temperature of the refrigerator drops belo
butalik [34]

Answer:

B.

Explanation:

Water expands on freezing and there is more water in the diet drinks than in the other drinks.

5 0
3 years ago
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