Chem_5ed Chap 2 Test

scientists classify a pure substance's chemical properties as

• any property that can be observed or measured without altering chemical composition

• those properties that describe how matter acts in the presence of other materials

the physical property describing the ability to be drawn into wires

• Brittleness
• Malleability
• Conductivity
• Ductility

the mass per volume ration of a material

• Weight
• Volume
• Mass
• Density

All of matter can be divided into two categories:

• pure substances and compounds

• Gases and liquids
• Atoms and molecules
• Mixtures and pure substances

Another word for a solution

• a homogenous mixture

• a heterogenous mixture

• a pure substance

• a solvent

Elements that prefer to be bonded in pairs with another atom of the same element are classified as

• diatomic elements

• binary elements

• monotomic elements

• twin elements

When is a pure substance considered a compound?

• when more than one atom is bonded together

• when more than one element is bonded together

• when more than one pure substance is combined

• when it is housing Osama bin Laden

Compounds are represented using ________ which show the element symbols and the number of atoms of each element in that compound.

• atomic models
• chemical formulas
• molecular structures
• element diagrams

How many atoms are one molecule of this compound: Be₃(Cr₂O₇)₂

• 18
• 21
• 14

• 24

mechanical, nuclear, chemical, potential, kinetic are all terms used to describe forms of

• matter

• energy

• people

• weaponry