Question

6) Pure water cannot conduct electricity so why do we have to be careful with electrical appliances near water our homes? 7) List and explain the 3 partcles and 1 ray given off in radioactive decay and explain what they come from if necessary. Also explain the effect on the nucleus when each decay happens. 8) If the solubility limit of sodium acetate (Molar mass 82 g/mol) at room temp is 76 grams per 100 grams of water, would a solution where 355 grams of sodium acetate is dissolved in 465 ml of water be considered supersaturated? Show all your work, and assume 1 ml water-1 gram 9) if the 5 Am isotope emits an alpha particle, what would be the atomic number of the 243 resulting daughter atom? 10) Explain how a nuclear powerplant works and give at least 3 isotopes that can go through fission 11) How many liters of 2.18 M solution can be made from 200.0 g K25? 12) What is the final concentration (M) of a solution prepared by diluting 50.0 mL of a 6.00 M KCI solution to a volume of 0.500 L

with steps

Answer 1

Pure" water is a very poor conductor (resistivity is actually used as a measure of purity).

"Real" water is not pure - it contains electrolytes and is quite conductive. Also - when your skin is wet, its resistivity is significantly lower.

For example - "pure" water has a resistivity of (about) 18.2 MΩ⋅cmΩ⋅cm. With 10 ppm of dissolved NaCl ("very good quality tap water" would have less than 50 ppm), the resistivity drops to about 43 kΩ⋅cm