What atom has 5 neutrons 4 protons and 2 electrons

Convert the pressure 0.840 atm to mm Hg

Explain the law of conservation of energy

What is the stable ion of cesium

Which substance has Hf defined as 0 kJ/mol?

What is the molality of a solution made by dissolving 137.9g of sucrose in 414.1g of water?

Hypervitaminosis is a serious health threat associated with excessive amounts of ingested fat-soluble vitamins. why do water-soluble vitamins not commonly pose the same threat?

Hydrogen is an element with two naturally occurring isotopes: 2 H and 3 H. This means that 2 H, which has a mass number of 2, has fewer than 3 H, which has a mass number of 3. True/False

C₂H₂ + O2 - CO₂ + H₂ How many moles of oxygen are necessary to react completely with 4.0 moles of propane (CH) ?

What are the two main classifications of energy resources?

A liquid is heated and a solid forms at the bottom of the beaker. Is this a physical or chemical change?