On the periodic table there are how many elements that occur naturally

Oxygen tanks can explode if the gas tanks is ignited. Why is this?

Base your answers to questions 66 through 68 on the information below. In the early 1800s, John Dalton proposed an atomic theory that was based on experimental observations made by several scientists.

Which component of air enables plants to synthesise their food by photosynthesis?

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

Which of the following balanced chemical equations below best represents the following "word" equation: Nitrogen gas reacts with hydrogen gas to produce ammonia. N2 + 3H2 - -> 2NH3 N + 2H2 - -> 2NH N2 + H2 - -> NH3 N2 + 2H - -> 2NH3

Atoms of cesium can lose electrons to become cations. how many electrons does a single cesium atom lose? explain your answer.

Which of the following are true about a block of ice at - 10°C as you continue to apply heat.

5. Do you have enough Na2CO3 for 1000 boxes of baking soda? A. Yes Β. No

Determine the concentrations of na2co3, na, and co32 - in a solution prepared by dissolving 1.80 * 10-4 g na2co3 in 2.25 l of water. express all three concentrations in molarity.

Reactivity with vinegar's definition, Chemical property Definition [Reaction with vinegar] [ ... ]