Why are hydrogen molecules called elements but water molecules are called compounds?

The earliest and simplest definition of acids and bases was suggested by

Potassium carbonate dissolved in water

1. A pyrotechnician mixes 280 g of black powder for a firework. Find the amount of oxygen, carbon dioxide, and sulfur dioxide generated when this firework bursts, if the oxidizing agent in the powder is saltpeter. 2.

Definition: A compound composed of two elements that share valence electrons.

Which procedure did early chemists use to determine which substances were elements? A. They observed the substances that made up individual atoms. B. They mixed several substances together and observed the results. C.

How does heat transfer takes place between any two systems?

Hydrate name of CaCl2 * 8 H2O

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide

Which stament best describes a solution

Which answer accurately describes the difference between speed and velocity? Read each answer choice carefully. Question 4 options: A. If speed is constant, then velocity is also constant. B. Speed requires direction.