2 years ago

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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How many total moles of ions are released when the following sample dissolves completely in water? Enter your answer in scientif

Katena32 [7]

Answer: The number of moles of strontium bicarbonate is $7.5\times 10^{-9}mol$

Explanation:

Formula units are defined as lowest whole number ratio of ions in an ionic compound. It is calculate by multiplying the number of moles by Avogadro's number which is $6.022\times 10^{23}$

We are given:

Number of formula units of $Sr(HCO_3)_2=4.55\times 10^{15}$

As, $6.022\times 10^{23}$ number of formula units are contained in 1 mole of a substance.

So, $4.55\times 10^{15}$ number of formula units will be contained in = $\frac{1}{6.022\times 10^{23}}\times 4.55\times 10^{15}=7.5\times 10^{-9}mol$ of strontium bicarbonate.

Hence, the number of moles of strontium bicarbonate is $7.5\times 10^{-9}mol$

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2 years ago

What is a possible cause of a large percentage of error in an experiment where mgo is produced from the combustion of magnesium?

PilotLPTM [1.2K]

A possible cause of a large percentage of error in an experiment where MgO is produced from the combustion of magnesium would be not all of the Mg has completely reacted. 

I hope this helps and if you have any further questions, please don’t hesitate to ask again.

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2 years ago

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wariber [46]

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2 years ago

Which of these describes an endothermic reaction?

neonofarm [45]

B) energy is absorbed by the reaction
is right answer.

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