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1st Semester Vocab

1st Semester Vocabulary for Science 8th grade Winter Wrap Up Project

Displacement Displacement is the method by which the volume of irregular objects is found, and it uses the shift in the water level to find the mass of the object.
Wafting Wafting is a method in Chemistry which allows the person smelling to smell the chemical or object without inhaling from directly above the liquid, the procedure is to take your hand and push the smell towards your nose, like so.
Graduated Cylinder The Graduated Cylinder is a piece of lab equipment that is a measuring instrument for measuring fluid volume, and is a glass container (cup or cylinder or flask) whose sides are marked with or divided into amounts.
Triple Beam Balance The Triple Beam Balance is a lab equipment used to measure mass and has three separate beams which have a weight on them each: a small weight (set to 1-10 grams), a middle weight (set to 10-100 grams), and a big weight (set to 100 gram sections).
Density Density is the measure of the mass per unit of volume of a substance or the compactness of a substance.
Synthesis Synthesis is a chemical reaction where two or more simple substances combine to form a more complex substance. Two or more reactants yielding one product is another way to identify a synthesis reaction, and it is the opposite of decomposition.
Single Replacement Single Replacement is chemical reaction where a single uncombined element replaces another in a compound. Two reactants yield two products. For example, when zinc combines with hydrochloric acid, the zinc replaces hydrogen.
Decomposition Decomposition is a chemical reaction where a more complex substance breaks down into its more simple parts. One reactant yields 2 or more products. Basically, synthesis and decomposition reactions are opposites.
Nucleus The Nucleus in chemistry terms is the positively charged, dense core of a nucleus where most of the mass is found and about which electrons orbit. The Nucleus of an atom is composed of protons (positively charged) and neutrons (negatively charged).
Proton The proton, a subatomic particle in the nucleus of an atom, has a positive charge and has about the same mass as the neutron, and the proton and neutron make up most of the mass in an atom. The proton count in a substance determines what element it is.
Electron The electron, a subatomic particle found in electron clouds of an atom outside of the nucleus, make up almost none of the mass in an atom and have a negative charge. The electron determines if it is an ion, and they also help form chemical bonds.
Neutron The Neutron, a subatomic particle found in the Nucleus of an atom, has about the same mass as a proton, and they make up most of the mass of the atom. The neutron has no charge and the number of them determine the isotope (Atomic # -Atomic Mass=Neutrons).
Atomic Number The Atomic number tells you the number of protons (or electrons if not an ion) an element has and is found in the periodic table of elements. The Periodic table of elements is arranged by atomic number.
Reactants The reactants are the substances that take part or undergo a chemical change in a chemical reaction. The reactants are found in the left side of a chemical reaction.
Newton's Second Law of Motion Newton's Second Law of Motion says that the change of momentum is proportional to the force used and goes in the direction of the force. So F=MA, or acceleration is directly proportional to the force applied. But as mass goes down, force needed goes up.
Balanced Force If a balanced force is acting on an object, then the net force is 0 and there is no movement.
Speed Speed is how fast an object is going or the distance it covered divided by the time it took. (25 m./sec.).
Velocity Velocity is the speed in a certain direction (25 m./sec. West).
Acceleration Acceleration is the change in the speed of an object or its direction, basically the change in the velocity (25 m./sec./sec. or 25 m./sec. squared).
Fast Negative Acceleration Fast Negative Acceleration is a term used on speed and time graphs where the speed decreases at an constant rate.
Slow Backward Movement Slow Backward Movement is a term used on distance and time graphs where the object being looked at goes back to its original position at a slow constant pace.
Created by: s0607683