Chemical Reactions (previous version)

What kind of elements in the periodic table did William Ramsay discover?

• a.metalloids
• b.metals
• c.noble gases
• d.nonmetals

The inertness of noble gases means that they:

• a.exist as gases at room temperature
• b.lose and gain electrons easily
• c.tend not to react with other elements
• d.tend to undergo many chemical reactions

Noble gases are inert due to:

• a.their special number of neutrons and protons
• b.their number of electrons in the outermost shell
• c.the form of their nuclei
• d.their bonding with other elements

In chemical reactions, when atoms gain or lose electrons they form:

• a.ions
• b.neutrons
• c.new atoms
• d.noble gases

The number of valence electrons in the group A elements is determined by:

• a.atomic number
• b.group number
• c.period number
• d.rank of the element

What type of elements lose electrons when they enter into chemical reactions?

• a.metals
• b.noble gases
• c.nonmetals
• d.none of the choices

What type of elements gain electrons when they enter into chemical reactions?

• a.metals
• b.noble gases
• c.nonmetals
• d.none of the choices

What is the maximum number of electrons that helium can have?

• a.Eight
• b.Four
• c.Three
• d.Two

Under what category of elements does helium fall:

• a.metals
• b.metalloids
• c.noble gases
• d.nonmetals

What is an exothermic chemical reaction?

• a.a reaction that absorbs energy
• b.a reaction that releases energy
• c.a spontaneous reaction
• d.none of the choices

What is an endothermic chemical reaction?

• a.a reaction that absorbs energy
• b.a reaction that releases energy
• c.a spontaneous reaction
• d.none of the choices

What reaction happens immediately after two substances are mixed?

• a.endothermic
• b.exothermic
• c.spontaneous
• d.none of the choices

What kind of change accompanies any chemical reaction?

• a.change of time
• b.change of order of elements
• c.change of nuclei
• d.change of energy