ATI TEAS 7 Chemistry Questions and answers 2022 Matter Anything that has mass + volume divisions of matter pure substances and mixtures Pure Substance A sample of matter, either a single element or a single compound, that has definite chemical and physical properties EX: O, H, CL, ( elements ) Compounds: H20, NaCL definite properties: always t he same Heterogenous mixtures are... mixtures that are not uniform throughout Oil and water - creating a distinct boundary Homogenous mixture example a mixture in which the composition is uniform throughout salt water Is blood homogeneous or heterogeneous? blood under microscope is heterogenous regular blood is homogenous Mass A measure / quantity of the amount of matter in an object Volume The amount of space an object takes up weight measurement of the gravitation al pull on a object - greater the gravitational pull on a object the more it will weigh will the weight of a space ship change yes will the mass of a spaceship change no Sub-atomic particles protons, neutrons, electrons Protons Positively charged parti cles Neutrons the particles of the nucleus that have no charge Electrons Negatively charged particles Atoms smallest unit of matter What is the center of an atom? protons and neutrons Where are electrons located? orbitals outside the nucleus Elements any substance that cannot be broken down into simpler substances - only the specfic atoms can create the element ex: Element Iron only has Iron atoms Diatomic elements are H2, N2, O2, F2, Cl2, Br2, I2 these have only have two atoms in PAIRS All diatomic molecules have Non Polar covalent bonds between the same atoms Molecules two or more atoms joined together Diatomic elements are Molecules Any other atoms jointed are molecules ex: H2O, CH4, H2, N2 What is a compound? 2 or more elements chemically combi ned all compounds are molecules Forms of matter solid, liquid, gas Protons are referred as In chemistry, the term proton refers to the hydrogen ion, H+ Solid fixed shape and volume - Molecules are packed together in a tight, orderly pattern - Vibrational motion, not translational motion - Retains shape - Retains density
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