Science 8 (Matter)

Who proposed the concept of indivisible atoms?

• Dalton

• Democritus

• Aristotle

• Newton

What constitutes the fundamental unit of matter?

• Molecule

• Element

• Compound

• Atom

What principle do unaltered atoms in chemical reactions support?

• Law of conservation of mass

• Law of constant composition

• Law of multiple proportions

• Law of definite proportions

Which state of matter features widely dispersed, constantly moving particles?

• Solid

• Liquid

• Gas

• Plasma

Why does ice transform into liquid water with added energy?

• Exothermic process

• Endothermic process

• Isotropic process

• Anisotropic process

Which model best illustrates matter at the submicroscopic level?

• Bohr model

• Quantum mechanical model

• Ball-and-stick model

• Space-filling model

What term describes heat release by a substance?

• Endothermic

• Exothermic

• Isotopic

• Anisotropic

How do interparticle attractive forces change with rising temperature?

• Strengthen

• Weaken

• Remain constant

• Disappear

How is a substance of only one atom type represented?

• Number

• Symbol

• Name

• Formula

What does the space-filling model depict?

• Atom and molecule sizes

• Electron arrangement

• Proton arrangement

• Neutron arrangement