A chemical reaction, where more energy is released than is needed to get the reaction started, is called?

A)

A really amazing reaction

B)

Endothermic

C)

Exothermic

D)

Non-reactive

Identify whether longhand notation or noble-gas notation was used in each case below. Potassium (K) : 1s22s22p63s23p64s1

Which of the following is an example of conservation of mass? A. mass before = 3g mass after = 3g B. mass before = 4g mass after = 3g C. mass before = 6g mass after = 12g

How are a substance and a solution similar? how are they different?

5.77 rounded to 1 dig digit

At the country fair carrie and same climbed up on the carousel horses and around and around they went the horses also bobbled up and down when they got off the carousel carrie told samuel they had been accelerating during their eide sam disagreed

It would take one light year to travel to the sun? True or false?

A specific, electrically neutral atom of boron has 5 protons, 5 electrons, and 6 neutrons. what is the mass number of this atom of boron? 6 5 11 16

When does hail happen?

For the reaction, calculate how many moles of the product form when 0.012 mol of O2 completely reacts. Assume that there is more than enough of the other reactant. 4Al (s) + 3O2 (g) →2Al2O3 (s) Express your answer using two significant figures.

Nuclei with too many or too few neutrons are?