(this question is from apex on course: physical science sem 2) which one of the following is an example of a composition reaction? a. 2na (s) + ci2 (g) → 2naci (s) b. zn (s) + 2hci (aq) → znci2 (aq + hz (g) c. cu (s) + 2agno3 (aq) → cu(no3)2(aq) + 2ag (s) d. caco3 (s) → cao (s) + o2 (g)

Apure solvent has a vapor pressure the vapor pressure of a solution. a. equal to b. lower than c. higher than

How many neutrons does a atom of cobalt have?

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