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Chemistry Grade 5
HFL Grade 5 Chemistry Assessed Vocab
| Question | Answer |
|---|---|
| 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
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