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guapka [62]
3 years ago
14

Write down the colours of the precipitates formed by reaction of aqueous caustic soda with solutions of: copper, zinc and ferric

salts.
Chemistry
1 answer:
max2010maxim [7]3 years ago
8 0

Answer:

Metal Color

Cobalt Pink (when hydrated)

Copper Blue

Iron (II) Green pale

Iron (III) Reddish brown

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When an ionic compound is placed in water, the positive end of the water molecule is attracted to the cation (+) of the ionic co
Pani-rosa [81]

Answer:

what's the question?I can't answer without a question

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Air is about 78.0% nitrogen molecules and 21.0% oxygen molecules. Several other gases make up the remaining 1% of air molecules.
kherson [118]

Answer:

The partial pressure of the other gases is 0.009 atm

Explanation:

Step 1: Data given

Air is about 78.0% nitrogen molecules and 21.0% oxygen molecules and 1% of other gases.

The atmospheric pressure = 0.90 atm

Step 2: Calculate mol fraction

If wehave  100  moles of air, 78 moles will be nitrogen,

21  moles will be  oxygen, and  1  mol will be other gases.

Mol fraction = 1/100 = 0.01

Step 3: Calculate the partial pressure of the other gases

Pgas = Xgas * Ptotal

⇒ Pgas = the partial pressure = ?

⇒ Xgas = the mol fraction of the gas = 0.01

⇒Ptotal = the total pressure of the pressure = 0.90 atm

Pgas = 0.01 * 0.90 atm

Pgas = 0.009 atm

The partial pressure of the other gases is 0.009 atm

4 0
3 years ago
True or false. When an area within an atom is crowded with electrons it is known as a dipole "moment False True
Rama09 [41]

Answer:true

Explanation:

4 0
2 years ago
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4 HF(g)+SiO2(s) → SiF4(9)+2 H2O(9) <br> Is the Si oxidized or reduced?
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8 0
3 years ago
naturally occurring bromine molecules, br2 have masses of 158, 160, and 162. they occur in the relative abundances 25.69%, 49.99
4vir4ik [10]
The average atomic mass of an element can be determined by multiplying the individual masses of the isotopes with their respective relative abundances, and adding them. 

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As described in the problem, the relative abundance for Br-79 is 25.69%. This is because 2 atoms of Br is equal to 79*2 = 158 amu. Similarly, the relative abundance of Br-81 is 81*2 = 162, which is 24.31%.
4 0
3 years ago
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