Straighterline Chem101 Final

total number of neutrons and protons in an atom; # protons + # electrons p Most nonmetallic elements are found in which block of the periodic table? Positive matter is concentrated in the central core Ernest Rutherford disproved J.J. Thomson's plum-pudding model of the atom by showing that... Potassium Plants use up copious amounts of which alkali metal, preventing most of it from being washed out to sea? 2:1:1:2 What is the ratio of reactants and products in the chemical equation? __NaOH + __H2SO4 -- __Na2SO4 + __H2O the number of ATOMS in 12g of Carbon-12 1 g = 6.022 × 1023 amu What is Avogadro's number? Mg What is the reducing agent in the following equation? Mg(s) + 2HCl(aq) - MgCl2(aq) + H2(g) (s) (l) (g) Which arrangement accurately describes the standard entropy values at different phases? 2, 8, 20, 50, 82 or 126 protons What are the most stable isotopes? S = oxidized N = reduced What element has been oxidized and what element has been reduced? 3CuS + 8HNO3 -- 3CuSO4 + 8NO + 4H2O multiply the atomic mass (grams) by the number of moles How do you convert from moles to grams? Divide the total number of grams by the atomic mass (grams) of 1 mole How do you convert from grams to moles? Mass measure of the amount of matter Compound made from atoms of 2+ elements that are chemically bonded; cannot be separated into simpler substances by any physical process; can be separated by a chemical reaction Solid Definite shape and volume Doesn't conform to shape of container Particles are very close together in orderly fashion with little freedom of motion Liquid Definite volume, indefinite shape Conforms to shape of the part of the container it fills Particles are close together but not rigidly in position with freedom to move past each other Gas No definite shape or volume Conforms to shape and volume of container Particles separated by distances very large compared to size of particles Physical Property Color, melting point, boiling point Observed and measured without changing identity of substance Chemical Property Observed by performing a chemical change Mixture Combination of 2+ elements, each retains its identity and properties Can be separated by physical means into pure components