Ch.7-Chemical reactions and electrolytes

Which of following are chemical reactions? a) butane burning in a lighter b) butane evaporating out of a lighter c) wood burning d) dry ice subliming

a) chemical c) chemical

Which of following are chemical reactions? a) ice melting b) Hydrogen and oxygen bubbles appear in water as an electrical current passes through c) iron rusting d) bubbles forming when a soda is opened

b) chemical c) chemical

What are the signs of a chemical reaction?

color change, solid formation, gas formation, emission of light, emission or absorbtion of heat

What is a strong electrolyte?

A substance that completely dissociates into ions in a solution

What is a weak non-electrolyte?

A substance that does not dissociate into ions in a solution

What is a weak electrolyte?

A substance with which a small percentage of molecules dissociate into ions in a solution

What is an electrolyte?

Ions that conduct electricity