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Chemistry Grade 5

HFL Grade 5 Chemistry Assessed Vocab

QuestionAnswer
Acid a compound usually having a sour taste and capable of neutralizing alkalis and reddening blue litmus paper
Base any of various compounds that react with an acid to form a salt, have a bitter taste, and turn red litmus paper blue
Atoms the smallest particle of an element that has the properties of the element and can exist either alone or in combination
Element any of more than 100 fundamental substances that consist of atoms of only one kind and that cannot be separated by ordinary chemical means into simpler substances
Compounds a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions
Electrons an elementary particle that has a negative charge of electricity and travels around the nucleus of an atom
neutrons an uncharged atomic particle that has a mass nearly equal to that of the proton and is present in all known atomic nuclei except the hydrogen nucleus
pH Scale a number used in expressing acidity or alkalinity on a scale whose values run from 0 to 14 with 7 representing neutrality, numbers less than 7 increasing acidity, and numbers greater than 7 increasing alkalinity
protons an atomic particle that occurs in the nucleus of every atom and carries a positive charge equal in size to the negative charge of an electron
chemical formula a way of expressing information about atoms in a particular chemical compound.
molecule the smallest particle of a substance having all the characteristics of the substance
metal any of various substances (as gold, tin, or copper) that have a more or less shiny appearance, are good conductors of electricity and heat, can be melted, and are usually capable of being shaped
non-metals elements that make up most of the crust, atmosphere and oceans of the earth
mass a quantity of matter or the form of matter that holds or clings together in one body
volume an amount of space as measured in cubic units
matter the substance of which a physical object is composed
solid a substance that keeps its size and shape
liquid neither solid nor gaseous, flowing freely like water
gas a fluid (as hydrogen or air) that has no fixed shape and tends to expand without limit
chemical change occur when objects or substances are changed or altered
physical change occur when objects or substances undergo a change that does not change their chemical nature
chemical property a material's properties that becomes evident during a chemical reaction e.g. Zinc reacts with hydrochloric acid to produce hydrogen gas
physical property any property that is measurable
periodic table an arrangement of chemical elements in order of atomic number that groups elements with common characteristics in the same area
mixture two or more substances that are put together but not chemically combined and that may vary in proportion
solution an act or the process by which a solid, liquid, or gaseous substance is dissolved in a liquid
nucleus the central part of an atom that includes nearly all of the atomic mass and consists of protons and usually neutrons
Created by: htran