Chemistry In Focus Chapter 1 Summary Question and 100% Verified Answers

Chemistry In Focus Chapter 1 Summary Question and 100% Verified Answers Negatively charged ions are called _____ - Correct Answer Anions The smallest particle of an element that is still recognisable as that element is called an _____ - Correct Answer Atom The process in which a liquid changes to a gas or vapour with the formation of bubbles throughout the liquid is called _____ - Correct Answer Boiling Positively charged ions are called _____ - Correct Answer Cations A change in which at least one new substance is formed is called a _____ _____or _____ _____ - Correct Answer Chemical change chemical reaction A pure substance that can be decomposed into simpler substances are called _____ - Correct Answer Compounds When a gas or vapour changes into a liquid it's called _____ or _____ - Correct Answer Condensation liquefaction Oxygen is an element, however, oxygen gas is not present as seperate independent atoms, instead it exists as pairs of atoms permanently stuck together to form molecules. Because of this, we say that oxygen gas is a _____ molecule. - Correct Answer Diatomic Pure substances that cannot be decomposed into simpler substances are called _____ - Correct Answer Elements The change of a liquid to a gas or vapour without the formation of bubbles is called _____ or _____ - Correct Answer Evaporation vaporisation The _____ of a _____ that exists as _____ is a combination of symbols of the elements in the compound with subscripts denoting how many atoms of each element are in the molecule. - Correct Answer Formula compound molecules The _____ of a _____ that is made up of _____ is a combination of the symbols of the atoms involved, with subscripts giving the ratio in which the elements are present in the compound. - Correct Answer Formula compound ions Symbols are used for elements. Compounds are made up of elements, so combinations of symbols are used to denote compounds. Such combinations of symbols are called _____ - Correct Answer Formulae