Chemistry 100 Exam 2 Questions With 100% Verified Answers

The elements in a column of the periodic table are known as - correct answers a group Which of these elements is chemically similar to oxygen? A) Sulfur B)calcium C)iron D)nickel E)none of these - correct answers A)Sulfur bc, they are in the same group Which of the following elements are the least reactive? A) Alkali metals B) Noble gases C) Halogens D) Alkaline earth metals E) Metalloids - correct answers B) Noble gases An exothermic reaction causes the surroundings to... A) warm up B) decrease in temp C) become acidic D) release CO2 E) condense - correct answers A) warm up What law stated that the total energy of the universe is constant? - correct answers Law of Conservation of Energy The specific heat capacity is - correct answers the amount of energy needed to change 1.00 g of a substance by 1.00 K Which process is exothermic? 1. freezing rain drops 2. evaporating alcohol 3. defrosting frozen food 4. warming milk 5, subliming dry ice - correct answers Defrosting frozen foods In the periodic table atoms are arranged in order of - correct answers atomic numbers What is the definition of an isotope? - correct answers The same # of protons and electrons but different # of neutrons. MORE than 1 atom. Ionic compounds always contain _ and _ . - correct answers cations/ anions The molar mass of a compound serves as a conversion factor between ____ and _____. - correct answers moles/ grams Avogadros number is a conversion factor between ____ and ____ - correct answers molecules/ moles If you change the number of protons, you change the - correct answers element If you change the number of neutrons, you change the - correct answers isotope If you change the number of electrons, you change the - correct answers charge You know the formula is an acid because it contains _____ and _____ - correct answers Hydrogen ions/ anions An anion is defined as - correct answers a charged atom or group of atoms with a net negative charge Rutherfords experiment with alpha particle scattering by gold foil established that - correct answers atoms are made of protons, neutrons, and electrons Which pair of the elements is most likely to form an ionic compound? 1. Sr and Cl 2. I and Ar 3. Ag and Au 4. N and O 5. Al and Co - correct answers Strontium and Cl Chloric acid is considered as a - correct answers oxoacid All of the following can be considered physical properties except 1. taste 2. color 3. flamability 4. density - correct answers flammability Identify the following with the correct choice 1.Whale 2.Air 3.Cooking spaghetti 4.CSUN 5.Grating swiss cheese d swiss cheese water 9. melting lead 10. iron rusting - correct answers 1. Heterogenous mixture 2. Homogenous mixture 3. Chemical 4. Heterogenous 5. Physical 6. Hetereogenous 7. Compound 8. Hetereogenous 9. Physical 10. Chemical