The only sure evidence for a chemical reaction is changes in properties the formation of a gas a color change the production of one or more new substances

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?