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nydimaria [60]
3 years ago
5

What is true about the speed of molecules in a sample of gas held at a constant temperature?

Chemistry
1 answer:
vovikov84 [41]3 years ago
3 0
At the constant temperatures the lighter the gas molecules, the faster the average velocity of the gas molecules.
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Please help!!
Olegator [25]
Molarity =  Moles/Liter

Use the molecular atomic mass of NaCl to convert from grams to moles.
Molecular mass of NaCl is the sum of its atomic masses. Look at the periodic table to find these. Na is 23 g/mol and Cl is 35.5 g/mol ,
so NaCl = 23 + 35.5 = 58.5 g/mol

multiply to cancel out grams
76 g NaCl * (1mol / 58.5 g NaCl) = 1.3 mol NaCl

over 1 Liter is just 1.3 M NaCl
Hope this helps!
8 0
3 years ago
Which describes the elements in a given group of the periodic table?
victus00 [196]
C is the answer I think
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ELEN [110]

Answer:

1 x 10^-12 mol dm^-3

Explanation:

[H+] = 10 ^ -pH

Therefore, pH 12 = 1 x 10^-12 hydrogen ion concentration

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Chemists investigated an unknown substance and found it to have the following characteristics:
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D the substance is a homogeneous mixture

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Blood samples for research or medical tests sometimes have heparin added. Why is this done? ​
alina1380 [7]
It is essential for accurate results that the correct volume of blood is sampled to achieve a correct concentration (and dilution, if liquid heparin is used), and that blood and anticoagulant are well mixed immediately after sampling.
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