How many milliliters of 0.20 M H₂SO4 are needed to completely neutralize 20 mL of 0.10 M NaOH solution? 5 mL 10 mL 40 mL 2.5 mL

For the reaction 2 H₂O → 2 H₂ + O2, how many moles of O2 are produced with 2.90 moles of H₂? Your answer should have 2 decimal places.

What is the half-life of the reaction when you begin with an initial concentration of AB= 0.80 M?

Four marbles are made of different metals. Each marble has the same mass, but a different volume. The density of each metal is given in the table. Metal Density (g/mL) scandium 2.99 silver 10.5 rhenium 20.8 tin 7.26 Place the marbles in order from largest to smallest. Largest tin marble scandium marble silver marble rhenium marble Smallest