Which of the following is evidence that matter is too small to be seen without magnification? A Feeling the heat come off the flames of a fire
B Feeling the grains of salt in between your fingers
C Watching salt disappear when it dissolves in water
D Watching rain fall from the sky during a thunderstorm

An object becomes electrically charged when: electrons are created in it electrons from it are destroyed electrons are transferred to it protons from it are destroyed protons are created in it

Classify this reaction: 2al+n2-> aln.

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?