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rusak2 [61]
3 years ago
13

Please help!!

Chemistry
2 answers:
ludmilkaskok [199]3 years ago
8 0

Answer:

yes, the law of conservation of mass hold true in this case burning magnesium strip is explained by this equation 2 Mg (s) + O2 (g) -> MgO (s)So the lighter magnesium, after reacting with oxygen in air, forms the heavier magnesium oxide. molar mass of magnesium and magnesium oxide are 24g and 40g respectively. So the same ratio 24:40 (i.e. 3:5) is maintained in the given masses of 48g and 80g, which means mass is conserved in the reacion.

Explanation:

Brainiest Please!!!

Mnenie [13.5K]3 years ago
8 0

Answer:

Yes, because when burning the magnesium strip the surrounding air also interacted and combined with it. In the experiment the final product weighs 80 grams, so you would subtract 80 – 48 leaving you with 32 grams. So the total mass of air that was added was 32 grams.

Ps. don't copy just reword

Explanation:

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Answer:

a.all four carbon atoms.

Explanation:

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your answer is A .



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Which of the following is ONE of the signs of a chemical change
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The weights of all elements are always compared to oxygen.
marishachu [46]

Answer:

The weights of all elements are always compared to the Carbon-12.

Explanation:

The weights of all elements are always compared to the Carbon-12 because the mass of carbon is 12 which is the exactly the sum of protons and neutrons.  

Oxygen was also considered the standard for some time but later this stander was rejected because in natural O¹⁷ and O¹⁸ were also present and this create the two different atomic mass tables.

AMU:

Atomic mass unit is define as the 1/12 the mass of an atom of carbon-12.

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This unit is used to express the masses of atoms. We know that masses of atoms are very small and we do not have any such type of balance that can measure very small quantity. So that is way we use this scale to measure small quantity. For example, according to this scale

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relative atomic mass of uranium is 238.0289 amu

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