January 2017 Chemistry Regents #16-20
Highlight to reveal answers and explanations
|
|||
Questions |
Answer | Links |
Explanations |
16 Which sample of matter represents a mixture?
(1) aqueous ammonia (3) liquid mercury (2) gaseous ethane (4) solid iodine |
1 | aqueous is in water | |
17 Differences in which property allow the separation of a sample of
sand and seawater by filtration? (1) concentration of ions (2) volume of sample (3) mass of sample (4) particle size |
4 | sand cannot fit through a filter | |
18 Which process is a chemical change?
(1) evaporating an alcohol (2) subliming of iodine (3) melting an ice cube (4) rusting of iron |
4 | 3 are phase changes and rusting is a reaction | |
|
|||
19 Which term represents an intermolecular force in a sample of water?
(1) hydrogen bonding (2) covalent bonding (3) metallic bonding (4) ionic bonding |
1 | H with F O N...hydrogen bonding | |
20 Which sample of matter has particles arranged in a crystalline
structure?
(1) Ne(g) (3) NaCl(aq) (2) Br2(ℓ) (4) CuSO4(s) |
4 | crystalline structure...solid | |
|