August 2019 Regents Chemistry Exam 9 Which term represents the fixed proportion of elements in a compound? (1) atomic mass (2) molar mass...

January 2020 Regents Chemistry Exam 11 Which substance can not be broken down by chemical means? (1) aluminum (2) ammonia (3) aluminum...

June 2023 Regents Chemistry Exam 40 Which particle diagram represents a sample of xenon at STP? Solution: Xenon is not a diatomic...

June 2023 Regents Chemistry Exam 16 The melting of an ice cube is an example of an (1) endothermic, chemical change (2) endothermic,...

June 2023 Regents Chemistry Exam 7 Which substance can be broken down by a chemical change? (1) cobalt (2) ethane (3) krypton (4)...

There are three phases of matter. Solids : have definite shape and volume Liquids: have definitely volume but take the shape of the...

June 2023 5 Which statement describes a chemical property of iron? (1) Iron is malleable. (2) Iron conducts electricity. (3) Iron reacts...

Ionic Bond = electrons are transferred Covalent Bond = electrons are shared Single covalent bond contains 2 electrons. Double contains...

Endothermic - energy is absorbed in the reaction Exothermic - energy is released in the reaction. Heat is the transfer of energy from...

January 2023 The particles in which sample have the lowest average kinetic energy? (1) 50. g of sulfur at 273 K (2) 40. g of aluminum at...