ABCTE- Basic Chemistry Part 2 questions and answers 2024/2025

ABCTE- Basic Chemistry Part 2What is a chemical reaction - correct answer a chemical reaction? Some indications of a chemical reaction include what - correct answer a change in temperature, such as in fire, a color change that indicates the presence of a different substance, and the generation of electrical current by a battery. Chemical reactions are written using what - correct answer shorthand similar to a mathematical equation. reactant A + reactant B product C + product D Unlike nuclear reactions, chemical reactions do not change the identity of any atom. There are always what - correct answer the same numbers and types of atoms before and after the reaction; they are just arranged differently Although new combinations of molecules exist, the equation must be what - correct answer must be balanced to show all atoms are accounted for. Equations are balanced by doing what - correct answer changing the number of molecules in the equation When balancing an equation, what is the rule for Coefficients, which indicate number of units, - correct answer they can be changed When balancing an equation, what is the rule for, subscripts that identify the number of atoms within a molecule - correct answer they cannot be changed. Many compounds include polyatomic ions, which are what - correct answer groups of atoms that are held together by chemical bonds and react as if they were a single atom