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puteri [66]
3 years ago
15

Is freeze-drying a physical change or chemical change?

Chemistry
1 answer:
Norma-Jean [14]3 years ago
7 0

Answer:

Physical change because it can go back to its original form.

Explanation:

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Complete end balance the reaction :copper plus hydrobromic acid
Reika [66]

Answer:

The correct answer is - 2Cu + 4HBr → 2H[CuBr2] + H2

Explanation:

Copper (Cu) and hydrobromic acid (HBr), which is a dissolved form of hydrogen bromide in the water, react and produce hydrogen dibromidocuprate (I) and hydrogen molecules.

The complete and balanced equation is -

2Cu + 4HBr → 2H[CuBr2] + H2

This reaction takes place in the medium of ester. Copper is in the suspension form in this reaction.

Thus, the correct answer is - 2Cu + 4HBr → 2H[CuBr2] + H2

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What is an oxidation number?
STALIN [3.7K]
An oxidation number is the electrical charge a molecule or ion appears to have as determined by a set of arbitary rules.
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4 years ago
QUESTION 7 Can you use alligation for any type of liquid? ​
NeTakaya

Answer:

Yes you can use alligation for a type of liquid. Explanation: Alligation is an old and practical method of solving arithmetic problems related to mixtures of ingredients.

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3 years ago
Which of the following best describes colloids?
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Answer B, because clear ,pure substances makes more sense then others, i searched it all up and came up b, please give brainliest!! good luck
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Using noble gas notation write the electron configuration for the chromium(II) ion
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Since chromium has 24 as its atomic number (which mean that it has 24 proton and 24 electron in neutral ground state), the electron configuration for the chromium would be :

1s^2 , 2s^2 , 2p^6 , 3s^2, 3p^6 , 3d^5 , 4s^1
6 0
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