HS Physical Science Sem 2 Unit 5 Elements

Why is oxygen an element?

• It is essential to life.

• It cannot be broken down into a simpler substance through chemical means.

• It combines with hydrogen.

• It burns.

How do elements form?

• through fusion in stars and supernova

• through chemical reactions

• through the cooling of molten lava

• through the evaporation of seawater

What is the expression of the chemical composition of a compound?

• bond arrangement

• electron arrangement

• element formula

• chemical formula

What is a common property of metals?

• conducts electricity

• insulates from electricity

• has very little reactivity

• is liquid at room temperature

Which choice represents a group of elements with common characteristics?

• silver, iodine, helium

• oxygen, hydrogen, lithium

• copper, oxygen, silver

• copper, gold, silver

Which elements most easily give up electrons?

• metals

• nonmetals

• metalloids

• noble gases

Which processes can elements be broken down through?

• only biological

• chemical processes, but not nuclear

• nuclear processes, but not chemical

• both chemical and nuclear

Which material is ductile?

• metal

• nonmetal

• metalloid

• noble gas

Sodium (Na)

is a highly reactive metal and chlorine (Cl)

is a poisonous gas.

Which compound do they form when they chemically combine?

• a poisonous metal

• table salt

• sodium hydroxide

• chlorine bleach

What does the atomic number represent?

• mass of an atom

• number of electrons in an atom

• number of protons in an atom

• total number of protons, neutrons, and electrons in an atom