4. Corhplete the table below.
Element / radical. Valency.
Sodium
zinc
sulphat...
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When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)
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Agas diffuses 1/7 times faster than hydrogen gas (h2). what is the molar mass of the gas? 100.10 g/mol 98.78 g/mol 86.68 g/mol 79.98 g/mol
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About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?
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