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Chemistry
| Question | Answer |
|---|---|
| The element X, in the table below, has 3 naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is _______ amu. Isotope Abundance Mass 221x 74.2 | 220.4 |
| Isotopes are atoms that have the same number of _____ but a different number of ______. | Protons; neutrons |
| The charge on the copper ion in the salt CuO is _______ | +2 |
| Which of the following atoms has the smallest number of neutrons? | Nitrogen-20 |
| What is the molecular formula for 1-propanol? | C3H7OH |
| The gold foil experiment performed in Rutherford's lab ____ | Led to the discovery of the atomic nucleus |
| Which isotope has 45 neutrons? | 80 35 Br |
| Elements in the same group of the periodic table typically have similar _____ | physical & chemical properties |
| There are ___ electrons, ____ protons, and_____ neutrons in an atom of the element below 132 54 Xe | 54,54,78 |
| The charge on an electron was determined ____ | during the Millikan oil drop experiment |
| Of the following, the smallest & lightest subatomic particle is the ___ | electron |
| Which statement below correctly describes how alpha, beta, and gamma radiation are affected by an electric field? | Alpha & beta are deflected in opposite directions, while gamma shows no response |
| There are ___ protons, ____neutrons, and _____electrons in 238U+5 | N3- |
| Which pair of elements would you expect to exhibit the greatest similarity in their physical & chemical properties? | Ca, Sr |
| Of the 3 types of radioactivity characterized by Rutherford, which is/are electrically charged? | a-rays & B-rays |
| Barium reacts w/ a polyatomic ion to form a compound w/the general formula Ba3(X)2. What would be the most likely formula for the compound formed between sodium & the polyatomic ion X? | Na3X2 |
| Which one of the following molecular formulas is also an empirical formula? | H2O |
| Which one of the following compounds is chromium (111) oxide? | Cr2O3 |
| How many carbon atoms are there in 52.06g of carbon dioxide? | 7.122x10 -23 |
| One mole of ___ contains the smallest number of atoms | NaCl |
| A sample of CH4O w/a mass of 32.0g contains___ molecules of CH4O | 6.02 x 10 to the 23rd power |
| One mole of ___ contains the largest number of atoms | C10H8 |
| When the equation CH4 + O2 --> CO2 + H2O is balanced, what are the coefficients? | 1,2,1,2 |
| When a hydrocarbon burns in air, what component of air reacts? | Oxygen |
| How many moles of pyridine (C5H5N) are contained in3013g of pyridine? | 0.0396 |
| How many oxygen atoms are contained in 2.74g of Al2(SO4)3? | 5.79x 10 to the 22rd power |
| The molecular weight of the ethanol (C2H5OH), rounded to the nearest integer, is ___ amu | 46 |
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