When electricity is produced from coal, the chemical energy in coal is changed to energy.
a solar
b kinetic
C thermal
d potential

Elements and compounds are pure substances that cannot be broken down physically into a simpler substance. a physical change doesn’t break the bonds between atoms of a substance or form new ones. compounds can be broken down by a chemical change. a chemical change breaks chemical bonds and/or forms new ones between atoms of a substance. what simple substance would a compound break into? the basic elements that make it up! for example, if you passed a very strong electric current through water you’d break the chemical bonds in water and be left with oxygen and hydrogen. which of the following is an example of a chemical change? a separating water into different glasses b breaking frozen ice cubes with a hammer c running an electric current through water d boiling water to evaporate it on a stove

Look at the images of different rocks. which rocks have a fine-grained texture? check all that apply. 1 2 3 4 5

Why is excretion necessary to maintain homeostasis?