Chem Final Review Bellringer 3

27) the mass number/average atomic mass of an element is equal to...

• the total number of electrons in the nucleus

• the total number of protons and neutrons in the nucleus

• less than twice the atomic number

• a constant number for the lighter elements

46) What type of ions have names ending in -ide?

• only cations

• only anions

• only metal ions

• only gaseous ions

69) The chemical reaction Fe + Cl₂ --> FeCl₂ is an example of a ___________________________ reaction.

• Synthesis

• Decomposition

• Single Displacement

• Combustion

71) Which of the following chemical reactions represents the decomposition reaction of lead (IV) oxide?

• PbO₂ --> Pb + O₂

• PbO --> Pb + O

• Pb + O₂ --> PbO₂

• Pb + O₂ --> PbO

80) The element Zr has _____________________ electrons.

• 40

• 91

• 92

• 51

98) 2NaBr + Ca(OH)₂ --> CaBr₂ + 2NaOH is an example of a ________________ reaction.

• Decomposition

• Single Displacement

• Double Displacement

• Synthesis

88) How many protons, electrons, and neutrons does the element boron have?

• 5 protons, 5 electrons, 5 neutrons

• 6 protons, 5 electrons, 5 neutrons

• 5 protons, 5 electrons, 6 neutrons

• 5 protons, 6 electrons, 6 neutrons

110) NH₄NO₃(s) + H₂O(l) --> NH₄NO₃(aq)

• Reaction

• No Reaction

114) In the chemical reaction: 2KClO₃ --> 2KCl + 3O₂, how many molecules of O₂ are there?

• 1

• 9

• 3

• 6

119) In the chemical reaction: 2KClO₃ --> 2KCl + 3O₂, how many atoms of O₂ are there in the reactants?

• 1

• 9

• 3

• 6