An enzyme contains an active site aspartic acid with a pKa=5.0, which acts as a general acid catalyst. Choose the curve of enzyme activity (reaction rate) versus pH for the enzyme (assume the protein is stably folded between pH 2−12 and that the active site Asp is the only ionizable residue involved in catalysis).

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

Which is an example of a reversible physical change?