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3 years ago

The first element on the periodic table of elements is carbon. A. True B. False

Chemistry

2 answers:

BabaBlast [244]3 years ago

7 0

b. False

The first element is hydrogen

ololo11 [35]3 years ago

6 0

False because Hydrogen is the first

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Answer: A

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2 years ago

How do particles in a solid move?

satela [25.4K]

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The particles in a solid vibrate in place.

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3 years ago

If 25.5g of sodium thiosulphate was dissolved in 40g of distilled water at 25°C,

zhenek [66]

Answer:

Formula: Na2S2O3

we get solubility.

Divide the mass of the compound by the mass of the solvent and then multiply by 100 g to calculate the solubility in g/100g .

Solution given:

mass of sodium thiosulphate [m1]=25.5g

mass of water [m2]=40g

at temperature [t]=25°C

we have

solubility in g/dm^3 : $\frac{solute in gram}{solvent in gram} *100$

= $\frac{25.5}{40}*100$
=63.75g /litre=63.75g/dm³

solubility in g/dm^3 :63.75g/dm³

now

solubility of the solute in mol/dm^3=:63.75g/dm³/178=0.4 mol/dm³

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3 years ago