Why are the masses of some elements listed as whole numbers in parentheses?

What is the evidence of a chemical reaction when the fireworks go off

2. The particles in the oxygen gas animation show many different kinds of motions. Identify three different kinds of motions/interactions you observe. Which motions create pressure on the walls of the container

Write a thermodynamic equation for a) the first ionisation energy for fluorine b) the second ionisation energy of magnesium

Nitrogen gas is used in fuel tank of aeroplane

If 15.0 g CO2 (mm = 44.01 g/mol) has a volume of 0.30L at 27oC, what is the pressure in atm? Group of answer choices 27.97 atm 1230.9 atm 2.52 atm 325.0 atm

The compound HCI is an example of a (n) A. covalent compound B. ionic compound C. element D. salt

Is the degree of highness or lowness of sound

A student has two substances at a lab table. One substance is iron pyrite (fool's gold) and the other is real gold. After placing a 20.0-gram sample of iron pyrite into 40.0 mL of water in a graduated cylinder, it displaces 4.0 mL of water.

Hydrolysis is an example of which type of reaction?

Which of the following best represents a neutralization reaction