June 2019 Chemistry Regents #11-15
Highlight to reveal answers and explanations
| |||
Questions | Answer | Links | Explanations |
|
11. During all chemical reactions, charge mass and energy are (1) condensed (2) conserved (3) decayed (4) decomposed
| 2 | conserved....on every test | |
|
12. The degree of polarity of a covalent bond between two atoms is
determined by calculating the difference in their (1) atomic radii (2) melting points (3) electronegativities (4) ionization energies
| 3 | BEND...bonding is electronegativity differences | |
|
13. Which substance can NOT be broken down by a chemical change? (1) ammonia (2) magnesium (3) methane (4) water
| 2 | definition of an element | |
| |||
| 14. Which statement describes the
components of a mixture? (1) Each component gains new properties. (2) Each component loses original properties. (3) The proportion of components can vary. (4) The proportion of components cannot vary.
| 3 |
mixtures can vary in proportions dilute to concentrated | |
|
15. Table sugar can be separated from a mixture of table sugar and sand
at STP by adding (1) sand, stirring, and distilling at 100.oC (2) sand, stirring, and filtering (3) water, stirring, and distilling at 100.oC (4) water, stirring, and filtering
| 4 | middles school experiment...sugar dissolves in water, sand does not...solids can be filtered out | |
| |||