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Vikentia [17]
2 years ago
14

Oxygen in the air can react with wood when a match is burned. Ash is produced.

Chemistry
2 answers:
Hitman42 [59]2 years ago
8 0

Answer:

D. Ash is a different substance than wood.

krek1111 [17]2 years ago
3 0

Answer:

D the atoms of ash did not exist before

Explanation:

because I jnwo .... k

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Calculate the pH of a solution that is 0.210 M in nitrous acid (HNO2) and 0.290 M in potassium nitrite (KNO2). The acid dissocia
jeka94

Answer:

pH = 3.49

Explanation:

We have a buffer system formed by a weak acid (HNO₂) and its conjugate base (NO₂⁻ coming from KNO₂). We can calculate the pH  of a buffer ssytem using the Henderson-Hasselbach equation.

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3 years ago
Differences between mixtures and elements
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What mass of silver nitrate will be needed to react with 125 grams of magnesium chloride?
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Answer:   m =  4.2 gAgCl

Explanation:  

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