This is the basis of the chemical standard for the quantity of a mole. a. oxygen-16 b. carbon-12 c. hydrogen-1 d. helium-2

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

Calculate the number of moles of ethane in 100 grams

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