ATI TEAS 7 Chemistry Questions and answers 2023

ATI TEAS 7 Chemistry Questions and answers 2023.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 the 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 gravitational 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 particles 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 combined 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 ex: Rock, Wood, Paper Liquid No fixed Shape FIXED VOLUME - Molecules are less ordered than solids, less tightly packed - Vibrational and translational motion - Shape is indefinite- takes shape of container - Retains volume ex: water, juice, soda Gas No fixed shape no fixed volume - Molecules are rapidly moving and spread far apart- - Highly compressible- expands to fill container •- No definite shape = No definite volume ex: Oxygen, Methane, Carbon Dioxide Changes in matter - Condensation: Gas - Liquid Deposition: Gas - Solid - Evaporation: Liquid - Gas - Freezing: Liquid - Solid - Melting: Solid - Liquid - Sublimation: Solid - Gas liquid to gas vaporization/evaporation gas to liquid condensation gas to solid deposition, exothermic solid to gas sublimation What is boiling point? The temperature at which a liquid changes to a gas what is critical point the temperature and pressure at which liquids and gases become indistinguishable Liquids and Gas have the same density the substance is indistinguishable between solid and gaseous states what is triple point The temperature and pressure at which all 3 phases of a pure substance coexists. point of a substance is the temperature and pressure at which three phases of a substance may coexist in thermodynamic equilibrium. What is a phase diagram? A graph of physical states of a substance under varying temperature and pressure. - can show triple point