Calculate the enthalpy of the reaction h2 (g) f2 (g) → 2hf (g) using bond enthalpies and compare this value to the result obtained by using the standard enthalpies of formation.

Which chemical formula shows an ionic compound? A. CO2 B. N2O C. NaCl D. C6H12O6 ]

What did ernest rutherford's gold foil experiment demonstrate about atoms? their positive charge is located in a small region that is called the nucleus. their negative charge is located in small particles that are called electrons.

Phosphoric acid is added to many popular beverages to give them a tart flavor. the formula of phosphoric acid is 1. h2po4. 2. h3po4. 3. hpo4. 4. h4po

A gas of 19 mL at a pressure of 740 mmHg can be expected to change its pressure when its volume changes to 30. mL. Express its new pressure in units of atmospheres.

In the periodic table, the period number indicates A. the number of dots shown on the Lewis dot diagrams for elements in that period. B. the number of valence electrons for elements in that period. C.

What fuel is produced by the electrolysis of water? chlorine gas hydrogen gas natural gas oxygen gas

Model describe how you would show j. j. thomson's model of the atom using small beads and clay

Switching one substance for another is called ... ? a) displacement b) synthesis c) decomposition d) oxidation

C2h4 + O2 - CO2 + H2O If we start with 20 grams of CH4, how many moles of CO2 will form?

How does chemical energy relate to the atom and how can we use it?