Q Solid substance are most likely to sublime

Q: Solid substance are most likely to sublime if they have… FIRST: WHAT IS SUBLIMATION? SECOND: FIND two answer choices that are pairs 1. Low vapor pressure and weak intermolecular attractions 2. High vapor pressure and strong intermolecular attractions 3. Low vapor pressure and strong intermolecular attractions 4. High vapor pressure and weak intermolecular attractions

Q: Which of the following liquids has the weakest van der Waal’s forces of attraction between it’s molecules? FIRST: What is meant by van der waal forces? SECOND: look at all the answer choices, what do they have in common? 1. Kr(L) 2. Xe(L) 3. He(L) 4. Ne(L)

Q: Which conditions are required to from 42 He during the fusion reaction in the Sun? • FIRST: What happens in a fusion reaction? 1. 2. 3. 4. Low temperature and high pressure Low temperature and low pressure High temperature and low pressure high temperature and high pressure

Q: An 80 milligram sample of radioactive isotope decays to 5 milligrams in 32 days. What is the half-life of this element? • FIRST: What equation do you use for ½ life? 1. 2. 3. 4. 8 days 2 days 16 days 4 days

Q: An uncontrolled chain reactions takes place during • FIRST: look at all the answer choices, what do they have in common? 1. 2. 3. 4. Fusion of light nuclei into heavier nuclei Operation of fission nuclear reactor Production of energy by the Earth’s Sun Explosion of an atomic bomb • SECOND: What is fusion…What is fission

Q: Hydrogen can exist as a liquid only at very low temperatures. This is primarily because the attractive forces between the molecules are FIRST: What is meant by van der waal forces? SECOND: look at all the answer choices, what do they have in common? 1. Hydrogen bonds 2. Van der Waals forces 3. Ionic bonds 4. Covalent forces

Q: Given the reaction 1 H + 3 H 4 He + energy 1 1 2 The process represent by the reaction is called FIRST: draw what each answer choice looks like 1. Artificial transmutation 2. fusion 3. fission 4. Alpha decay

Q: The atomic mass unit is defined as exactly 1/12 of the mass of an atom of FIRST: FIND two answer choices that are pairs 1. 14 C 6 2. 24 Mg 12 3. 12 C 6 4. 26 Mg 12

Q: Which process represents a chemical change? FIRST: FIND two answer choices that are pairs 1. 2. 3. 4. Evaporation of water Melting of ice Corrosion of Copper Crystallization of sugar

Q: Nuclear fusion differs from nuclear fission because nuclear fission reactions FIRST: What is fission? What is fusion? 1. 2. 3. 4. Convert mass to energy Form heavier isotopes from lighter isotopes Convert energy to mass Form lighter isotopes from heavier isotopes

Q: What is the charge of the nucleus in an atom of oxygen-17? FIRST: What subatomic particles are in the nucleus? What are the charges of these particles? 1. 2. 3. 4. 0 -2 +8 +17