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Stack #2912992

QuestionAnswer
What are the three subatomic particles called? Protons, neutrons and electrons
What are the names of the electron shells in order (inside to outside)? K, L, M, N
What are valence electrons? All of the electrons in the outer shell
What is the electron valance shell configuration? 2, 8, 18, 32
What are isotopes? Isotopes are atoms of the same element, but different amounts of neutrons
What are some signs of when a chemical change has occurred? Smell of the new substance, permanent colour change, gas is given off, change in temperature indicating energy is produced or absorbed or one metal deposits on another
What are some signs when a physical change has occurred? Changes state or shape, breaks into smaller pieces or dissolves
What is the difference between reactants and products? Reactants are the original substances present in a chemical reaction whereas products are chemical substances that result from the chemical reaction
What is the Law of Conservation of Mass? “Matter can neither be created nor destroyed during a chemical reaction”
What is an endothermic reaction? An endothermic reaction is a reaction that absorbs heat, taking it from the surroundings and making them feel colder
What is an exothermic reaction? While endothermic reactions absorb energy, exothermic reactions release energy
What is the difference between an element and a compound? An element is a pure substance of only one element whereas a compound is two different elements chemically bonded together
What is a chemical equation? A chemical equation is a convenient way of showing what happens to different substances in a chemical reaction
What is the big number called in front of elements in a chemical equation? Co-efficient
What is the difference between atomic numbers and mass numbers? Atomic numbers are the amount of protons in an atom whereas mass numbers are the amount of protons and neutrons in an atom
Created by: smi0149
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