How do you determine the density of a substance or object?

What four elements did the ancient greeks think the world was made of?

A chemist measures the energy change? H during the following reaction: 2H2O (l) ?2H2 (g) + O2 (g) =? H572. kJ Is the reaction endothermic or exothermic? Does it absorb or release heat when 75.

How would you explain the difference between an element and an atom?

The age of fossils can sometimes be determined by radiometric dating, which is based on the constant rate of decay of radioactive isotopes. the time required for half of a radioactive isotope to decay is called the half-life of that isotope.

What happens to water molecules when they are heated

How many grams of tin are found in 3.5 moles of tin

Determine whether each statement is a description of a physical property or a chemical property. Paper burns readily in air.

Cual es la función de los lípidos?

Butane - ethane - methane - propane: What do these hydrocarbons have in common? A) The same number of carbons present. B) They all have polar covalent bonds. C) They all have single covalent bonds. D) They have the same structural formulas.

Identify the form of energy that is converted into ther - mal energy by your body