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Unit 2 Learning
Unit 2 Learning Statements - Chemical Formulas & Reactions
| Question | Answer |
|---|---|
| Chemical Formula | states the number of atoms of each element in a compound |
| Periodic Table | shows the atomic symbol or abbreviation for each element |
| Subscript | number written slightly lower after an atomic symbol and states the number of atoms for that element |
| Atomic Symbol with No Subscript | states there is only one atom of the element |
| Total Number of Atoms in a Molecule | Count the atoms of each element and add the numbers |
| Reactants | found on the left side of the arrow in a chemical reaction |
| Products | found on the right side of the arrow in a chemical reaction |
| Evidence of a Chemical Reaction | *production of gas or bubbles *changes in temperature *production of a precipitate (solid formed) *color change *formation of a new substance *produces light |
| Law of Conservation of Mass | in a chemical reaction , the mass of the reactants will equal the mass of the products |
| Law of Conservation of Mass | in a chemical reaction, the number of atoms for the reactant side will equal the number of atoms on the product side |
| Reactants | elements and compounds located on the left side of the arrow in a chemical reaction |
| Products | elements and compounds located on the right side of the arrow in a chemical reaction |
| Atom | the smallest part of matter that has distinct physical and chemical properties |
| Atom | Consists of a nucleus, which contains protons and neutrons, and electron cloud, which contains electrons |
| Chemical Change | a type of change in which a new substance is made from one or more previous substances |
| Chemical Change | a change where the atoms of the original substance are rearranged to make new elements and/or compunds |
| Chemical Reaction | a chemical change that occurs when two or more substances combine to form a new substance |
| Chemical Reaction | the rearrangement of atoms to produce new compounds with different physical and chemical properties |
| Closed System | a physical system that does not allow the transfer of matter in or out, although energy can flow into or out of the substance |
| Matter | Substance that occupies space, has mass, and is composed of microscopic particles |
| Periodic Table | an organizational chart of all the known elements on Earth, organized based on the physical and chemical properties of each |
| Property | Characteristic of metal that can be used to identify particular materials |
| Subscript | Small number behind a chemical symbol which tells you the number of atoms |
| Coefficient | Large number in front of a chemical formula that is multiplied to all elements |
| Counting Atoms | Multiply coefficients by subscripts to find the total number of atoms |
| Chemical Symbol | Abbreviation for an element on the periodic table |
| Chemical Symbol | Contains 1 capital letter; elements symbols may contain one lowercase letter beside the capital letter |
| Law of Conservation of Mass | Mass is not created or destroyed. |
| Law of Conservation of Mass | Example : Balanced equations where the number of atoms in the reactants is equal to the number of atoms in the products |
| Law of Conservation of Mass | Example : A chemical reaction where the mass of chemicals in grams is equal to the mass of chemicals in the products. In a closed system, any gas produced is captured so that no product escapes and is included in the mass measurement. |
| Law of Conservation of Mass | # of atoms in the reactants = # of atoms in the products |
| Law of Conservation of Mass | Mass of reactants equals mass of products |
| metals | found on the lefts side of the periodic table |
| metals | high electrical and thermal conductivity, malleability ( ability to be hammered into thin sheets), ductility ( ability to be drawn into thin wires), and metallic luster (shininess) |
| metals | solid at room temperature , have high melting points, and are dense, although some exceptions like mercury (a liquid) exist |
| nonmetals | found on the right side of the periodic table |
| nonmetals | poor conductors of heat and electricity, are brittle solids, and lack metallic luster |
| rare earth metals | 17 metallic elements - the 15 lanthanides plus scandium and yttrium |
| rare earth metals | crucial for modern technologies like electronics, wind turbines, and electric vehicles - Abundant but hard to find |
| metalloids | found on the zig zag line between metals and nonmetals on the periodic table |
| photosynthesis | light energy converted into the chemical energy of glucose |
| photosynthesis | reactants - water and carbon dioxide products - glucose and oxygen |
Created by:
YoungbloodScience
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