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Chem Part 2

Acids & Bases, Density, Atmosphere, Products & Reactants, and Law of Con of Mass

QuestionAnswer
What is an acid? any compound that increases the number of hydrogen ions when dissolved in water
What is a base? any compound that increases the number of hydroxide ions when dissolved in water
What is a chemical bond? an interaction that holds atoms or ions together
What is chemical bonding? the combining of atoms to form molecules or compounds
What is a chemical change? a change that occurs when one or more substances changes into a new substance with different properties
What is a chemical formula? a combination of chemical symbols and numbers to represent a substance
What is a a chemical reaction? the process by which one or more substances change to produce one or more different substances
What is a compound? a substance made up of atoms of two or more different elements joined by chemical bonds
What is density? the ratio of the mass of a substance to the volume of the substance, how tightly compacted the particles of an object are, Density = mass/volume
What is an indicator? A compound that can reversibly change color depending on conditions such as pH
What is an ion? a charged particle that forms when an atom or group of atoms gains or loses one or more electrons
What does the Law of Conservation of Mass state? Mass cannot be created or destroyed but can change forms. The amount of mass that goes into a chemical reaction = the amount at the end of the reaction.
What is mass, the tool used to measure mass, and the unit? Mass is the amount of matter in an object. The tool used to measure mass is the triple-beam balance. The unit is grams.
What is matter? Anything that has mass and takes up space.
What is a molecule? The smallest unit of a substance that keeps all of the physical and chemical properties of that substance
What is pH? a value that is used to express the acidity or basicity (alkalinity) of a system
What is a product? A substance that forms in a chemical reaction, the results - products are on the right side of the chemical equation
What is a reactant? a substance that participates in a chemical reaction , the ingredients - reactants are on the left side of the chemical equation
What is a closed system? It is a system in which neither reactants nor products can enter or escape
What is the pH range for acids and what number is the most acidic? 0-6.9 0 is the most acidic and 6.9 is the least acidic.
What is the pH of pure water? 7 - it is neutral
What is the pH range for bases? What number is the most basic? 7.1-14 14 is the most basic and 7.1 is the least basic.
What are some common properties of acids? tastes sour, conducts electricity, corrosive,reacts with metals, pH of 0-6.9
What are some common properties of bases? tastes bitter, feels slippery to touch, can conduct electricity, pH of 7.1-14
What are the most abundant gases in Earth's atmosphere? Nitrogen - 78%, Oxygen - 21%, Argon - 0.9%, Others - 0.1%
What are the reactants that form rust? Oxygen AND Iron. Water is NOT involved.
What color does an acid turn litmus paper? An acid turns blue litmus paper red.
What color does a base turn litmus paper? A base turns red litmus paper blue.
Created by: weatherheadn