12 g of commercial zn is made to react with
excess dil H₂So4.
The total volume of H2 gas
literated was found to be 4.2 l at 500 mm
of Hg pressure and
pressure and 279 . Determine percentage
purity of zn

What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?

In one or two grammatically correct sentences, write a definition for the term molecule geometry