August 2015 Chemistry Regents #11-15
Highlight to reveal answers and explanations
| |||
Questions | Answer | Links | Explanations |
| 11 Given the balanced equation: F2 + energy → F + F Which statement describes what occurs during this reaction? (1) Energy is absorbed as a bond is formed. (2) Energy is absorbed as a bond is broken. (3) Energy is released as a bond is formed. (4) Energy is released as a bond is broken. | 2 | link | breaking bonds absorbs energy forming bonds releases |
| 12 Which atoms will bond when valence electrons are transferred from one atom to the other? (1) O and Se (3) O and H (2) O and Sr (4) O and P | 2 | link | transferred= ionic
look for metal and nonmetal |
| 13 Which sample of matter is a mixture? (1) Br2(ℓ) (3) KBr(s) (2) K(s) (4) KBr(aq) | 4 | link | look for aq it's a solution |
| |||
| 14 According to kinetic molecular theory, collisions between gas particles in a sample of an ideal gas (1) increase the energy content of the gas sample (2) produce strong attractive forces between the gas particles (3) result in a net loss of energy by the gas sample (4) transfer energy between the gas particles | 4 | link | transfer energy between the gas particles |
| 15 Which substance can not be broken down by a chemical change? (1) ethane (3) silicon (2) propanone (4) water | 3 | link | which is an element? |
| |||