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GREYUIT [131]
3 years ago
14

Which is not an indication of a chemical change

Chemistry
1 answer:
sasho [114]3 years ago
8 0
Did you have any choices??

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D) reacts with oxygen
All other are physical properties.
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What is the electron configuration of Iron
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The electron configuration of Iron is:

[Ar] 3d⁶4s²

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What is the empirical formula of a compound consisting of 29.6% oxygen and 70.4% fluorine by mass?
Rainbow [258]
O1Fl2

1. Assume an 100g sample, so the percentage will stay the same

2. Covert each element into their molar mass
29.6/16.00=1.8 mols of O
70.4/19.00=3.7 mols of Fl

3. Divide both by the smallest value of mol
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4. Write the empirical formula:
O1Fl2
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3 years ago
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Which of the following solutes will lower the freezing point of water the most? NaCl, CaCl2!or AlBr3
MA_775_DIABLO [31]
This uses the concept of freezing point depression. When faced with this issue, we use the following equation:
ΔT = i·Kf·m
which translates in english to:
Change in freezing point = vant hoff factor * molal freezing point depression constant * molality of solution
Because the freezing point depression is a colligative property, it does not depend on the identity of the molecules, just the number of them.
Now, we know that molality will be constant, and Kf will be constant, so our only unknown is "i", or the van't hoff factor.
The van't hoff factor is the number of atoms that dissociate from each individual molecule. The higher the van't hoff factor, the more depressed the freezing point will be.
NaCl will dissociate into Na+ and Cl-, so it has i = 2
CaCl2 will dissociate into Ca2+ and 2 Cl-, so it has i = 3
AlBr3 will dissociate into Al3+ and 3 Br-, so it has i = 4
Therefore, AlBr3 will lower the freezing point of water the most.
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3 years ago
Sedimentary rocks that are made up of large pebbles and stones have a coarse-granied?
umka2103 [35]
....................................................................
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