What mass of naoh would need to be dissolved in 500. 0 ml of water to produce a solution with a ph of 12. 40?.

Which characteristic demonstrates a healthy self-esteem? accepts others does not listen well seeks constant approval frustrates easily

17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?

Scientists observed a rock stratum with fossil. if mollusks evolved before arthropod, where will their fossils be found.