The number marked in red in front of an ammonia 4 NH3 molecule is called I.
All choices are correct

II.
Coefficient

III.
- shows how many atoms of an element are in a molecule

IV.
Describes a physical change

Complete this brønsted-lowry reaction placing each product by its appropriate label. hso4- + hcn

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

How many liters of 3.0 m naoh solution will react with 0.60 liters of 4.0 m h2so4? h2so4 + naoh → na2so4 + h2o 1.2 l 1.6 l 2.4 l 2.8 l