Which is greater, the mass of the compounds before a chemical reaction or the mass of the compounds after a chemical reaction?

the mass of the compounds before is greater.
the mass of the compounds after is greater.
the masses before and after are equal.
it depends on the type of chemical reaction.

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.