Exam 1

Question 1

Matter: macroscopic & molecular definition

Answer 1

Macroscopic: anything has mass & space (see, touch, ie.water)

Molecular: anything composed of molecules (ions, atoms, subatomic particles)

Question 2

Most fundamental building blocks of matter:

Answer 2

subatomic particles (electrons, neutrons, protons)

Cannot separate into any smaller parts

Question 3

3 states of matter

Answer 3

Solid: fixed position, vibrate, can’t leave position in crystalline lattice

Liquid: glued together, can slide past each other, vibrate & rotate

Gas: free to move, occupy entire volume container

Question 4

Allotropes:

Answer 4

different forms of same element (ie. oxygen gas)

Regular oxygen gas (O2), heated, becomes ozone gas (O3)

Question 5

Compounds:

Answer 5

combining different atoms (elements)

water [H2O]

Question 6

Element:

Answer 6

molecules contain only 1 type of atom

(cannot be decomposed) [O2]

Question 7

Pure substance:

Answer 7

same molecule - hydrogen peroxide (H2O2)

Question 8

Mixture:

Answer 8

different molecules

Question 9

Homogenous mixture:

Answer 9

uniform, mixed very thoroughly - solutions & air

Homogeneous mixtures, solution (variable composition)

Question 10

Heterogeneous mixture:

Answer 10

distinct clumps different molecules/substance

oil & water