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2 years ago

True or false 4 questions help please!

Chemistry

1 answer:

Alekssandra [29.7K]2 years ago

5 0

Answer:

Explanation:

True or false 4 questions help please!

Most mixtures are not physical changes.

True

False FALSE when I add solid NaCl salt to water I no longer have a solid salt, I have a solution of sodium and chlorid ions in liquid water. this is physical change

Chemical Changes do not create a new substance.

True

False FALSE 0ne of the proofs that you have a chemical change is the presence of a new substance

Fire is an example of a Chemical Change.

True TRUE fire is oxygen reacting wiIh mattter to form new compounds

False

Explosions are not chemical changes.

It depends on the explosion if I blow up a balloon until it POPS!! that is physical chame. If I light a firecracker and it explodes, that is a chemical change of oxygen reacting with hot gunpowder

A change in color and odor are both examples of chemical changi

I would rewrite the question as

A change in color and odor both INDICATE a chemical change

and that is

True TRUE

False

True Fire is an example of a Chemical Change.

True

False

Explosions are not chemical changes.

True

False

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Answer:

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Explanation:

Kps es the constant referring to how much a substance can be dissolved in water. Using Kps, it is possible to know the concentration of weak electrolytes. Then, pKps is the minus logarithm of Kps.

Now, we know that sodium hydroxide (NaOH) is a strong electrolyte, who is completely dissolved in water. Therefore the pH depends only on OH concentration originating from NaOH. Let us to figure out how much is that OH concentration.

$pH= -log[H]\\pH= -log (\frac{kw}{[OH]})$