When a 0.3435 gram sample of solid calcium (Ca) was burned in a constant-volume calorimeter (bomb calorimeter) with a measured heat capacity of 0.1985 kJ/°C, the temperature of the calorimeter increased by 27.41°C.

a chemical reaction happens

explanation:

i believe it is 40–40–20%

explanation:

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.