How many neutrons are in an atom with the atomic number of 15 and an atomic mass number of 34?

? 19

? 15

? 34

How can you form new neural pathways that will lead to transformed thinking and a transformed life?

The combustion of ethane (C 2 H 6) produces carbon dioxide and steam. 2 C 2 H 6 (g) + 7 O 2 (g) ⟶ 4 CO 2 (g) + 6 H 2 O (g) How many moles of CO 2 are produced when 5.20 mol of ethane is burned in an excess of oxygen?

A scientist studies how air blowing on plants affects their growth. He uses fans to create different amounts of wind and measures the growth of the plants. What would make this experiment more repeatable?

Which procedure did early chemists use to determine which substances were elements? A. They observed the substances that made up individual atoms. B. They mixed several substances together and observed the results. C.

What is the density of the marble when the mass = 10g

BaBr2 is a ionic compound, Covalent compound or a acid

What are the structural features of purines and pyrimidines?

Why does bromine not react with sulphur?

What happens to the size of the atom of anon-metal as it becomes an anion? A. it decreases B. it increases C. it remains the same D. it is impossible to tell unless you know the specific element

How is oxygen and nitrogen alike