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Lady bird [3.3K]
2 years ago
9

1. Which of the following is an example of a physical change to matter?

Chemistry
2 answers:
sertanlavr [38]2 years ago
6 0
1. C. Freezing
2. B. Dissolving salt in water
Ostrovityanka [42]2 years ago
4 0

Answer:

1) FREEZING

2)DISOLVING SALT IN WATER

Explanation:

A physical change is the one that can be easily reversed and there is no new substance formed. However , physical change can always be reversible.

For instance the separation of mixtures by evaporation is physical change.

As we have physical change there is also a chemical change which a change that's cannot be reversed easily and there's no new substance formed. Examples are addition of water to quicklime, fermentation of substance,melting a stick of butter

,using magnesium to displace hydrogen gas from water.

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Answer:

(D) (CH3CH2)2NH

Explanation:

In order to decide which base is strongest we need to calculate its PKb

PKb = -log [Kb]

A large Kb value and small PKb value gives the strongest base

 Compound                   Kb                           PKb      

(A) C6H5NH2 -         4 x 10^-10                      9.349

(B) NH3                     1.76x 10^-5                    4.754

(C) CH3NH2              4.4x 10^-4                     3.357

(D) (CH3CH2)2NH   8.6x 10^-4                     3.066

(E) C5H5N                  1.7x10^-9                      8.77  

Clearly (CH3CH2)2NH is the strongest base.

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The wheels will be completely used up and  it is the limiting reactant in this case.

<h3>What is a limiting reactant?</h3>

The limiting reactant is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.

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The wheels will be completely used up and  it is the limiting reactant in this case.

Learn more about limiting reactants here: brainly.com/question/14222359

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