Calculate the ph of each of the following solutions: (a) 30.0 ml of 0.150 m hcl is mixed with 0.736 g of k(ch3coo) and brought to a total final volume of 50.0 ml (b) the solution in (a) has 3.00 ml of 0.200 m hcl added to it. (c) the solution in (a) has 30.00 ml of 0.100 m naoh added to it.

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

Compare and contrast physical changes with chemical changes.

Select the correct answer from each drop-down menu.describe what happens to a carbon-11 atom when it undergoes positron emission.the decay of a carbon-11 atom _1_, and this causes it to emit _2_.options for 1: > changes a neutron into a proton> changes a proton into a neutron> is hit with a neutron> reconfigures its protons and neutronsoptions for 2: > a negatively charged electron-sized particle> a positively charged election-sized particle> two atoms and several neutrons> two neutrons and two protons