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Studentka2010 [4]
3 years ago
9

Which element has this electron configuration? astatine bromine chlorine fluorine

Chemistry
2 answers:
lapo4ka [179]3 years ago
6 0
The halogen element contains the electron configuration: asthetine, bromine, chlorine, flourine
Anna11 [10]3 years ago
4 0

Answer:

the correct answer is chlorine

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2 What is the correct sequence of steps for the preparation of a pure sample of copper(II) sulfate
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Answer:

The correct answer is - B. dissolving → evaporation filtration → crystallisation

Explanation:

The method of the preparation of a pure sample of copper(II) sulfate from dilute sulfuric acid and copper II oxide is given as follows:

step 1. Adding dilute sulfuric acid into a beaker. Using bunsen burner heat the beaker.

step 2. Adding the copper (II) oxide into the beaker and give it a little time at a time to the warm dilute sulfuric acid and stir

step 3. Filtering the mixture into an evaporating vessel to remove the excess copper (II) oxide and water from the filtrate.

Step 4. leave the rest filtrate to crystallize.

Copper (II) Oxide  {CuO (s)}  +  Dilute Sulfuric Acid {H2SO4 (aq)}   →  Copper (II) Sulphate {CuSO4 (s)}   +  Water {H2O}

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2 years ago
Suspect A is actually telling the truth and they describe the events of a certain evening with confidence. After being asked to
lorasvet [3.4K]

It seems like the answer is C, you really just need to use the process of elimination.

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3 years ago
How does energy transfer from the sun to earth and the atmosphere
kumpel [21]

through conduction, radiation, and convection.

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Ordered: 0.3 gm. Available: 300 mg/tablet. How many tablets should be given?
dimulka [17.4K]

Answer:

1 tablet

Explanation:

Assuming that gm stands for gram:

Put everything in one unit, 0.3 g = 300 mg.

And given that each tablet is 300 mg:

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Ionization of sodium dichromate​
inessss [21]

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this is the answer of your question .

hope it helped you

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