Which of these processes are chemical reactions?
boiling an egg
crushing spices
vegetables rotting
chopping vegetables
dew forming

In the particles are arranged in a regular, repeating pattern. a)a crystalline liquid b)a crystalline solid c)all gases d)all solids

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.