science study topic 1 Flashcards
chemical world (30 cards)
what are elements
pure substances made up of only one kind of atom.
what is a compound
substances formed when two or more different types of atoms bond together chemically
what is an example of an element
oxygen
what is an example of a mixture
a salad
what is an example of a compound
water
what is a mixture
combinations or two or more substances that are not chemically bonded, so they keep their individual properties. (they are not bonded)
what is an atom
the basic building block of all matter. everything around us like plants, animals and even air.
what is the structure of an atom
protons.
neutrons.
electrons.
what charge is a proton
positive charge (+) , about 1 atomic mass unit
what is an electrons charge
negatively charged (-) , about 1/1836 atomic mass units
what charge is a neutron
no charge at all
where are electrons located
on the nucleus shells
where abouts are the protons and neutrons located
located in the nucleus
what does the term mass number mean
the number of protons and neutrons in the nucleus.
what is the term atomic number mean
number of protons in the nucleus
what does the term matter mean
anything that has mass and takes up space. it can exist in different states including solids, liquids and gasses
what does volume mean
amount of space an object occupies
what does mass mean
amount of matter in an object (what typically makes up its weight)
