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Anni [7]
3 years ago
9

Which is a physical change? A) Rusting iron B) Burning paper C) Reacting baking soda and vinegar D) Separating a mixture of salt

and wat
Chemistry
1 answer:
Deffense [45]3 years ago
7 0

Answer:

D

Explanation:

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Explanation:

Some Rules Regarding Oxidation Numbers:

- Hydrogen has oxidation number of + 1 except in hydrides where it is -1

- Oxygen has oxidation number of -2 except in peroxides where it is -1

- Some elements have fixed oxidation numbers. E.g Halogen group elements has oxidation number of -1

- Oxidation number of a compound is the sum total of the individual elements and a neutral  compound has oxidation number of 0.

A. HI

Hydrogen has oxidation of + 1

Oxidation number of I:

1 + x = 0

x = -1

B. PBr3

Br has oxidation number of - 1

Oxidation number of Pb:

x + 3 (-1) = 0

x = + 3

C. KH

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1 + x = 0

x = -1

D. H3PO4

Hydrogen has oxidation number of + 1

Oxygen has oxidation number of -2

Oxidation number of P:

3(1) + x + 4(-2) = 0

3 + x - 8 =0

x = 5

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3 years ago
What is an isotope? atoms of the same element with different number of​
geniusboy [140]

Answer:

The same element that contain equal number if protons but different number of neurons in their nuclei and hence differ in relative atomic mass

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Which of these answers best describe a fossil ?​
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Indirect costs incurred in a manufacturing environment that cannot be traced directly to a product are treated as a.product cost
Alisiya [41]

Answer:

C. product costs and expensed when the goods are sold

Explanation:

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The first method of determining the chemical composition of substances in space was to _____.
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