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U8.1 Study Guide (Counting by Weighing)
Quiz by Aaron Holley
Tag the questions with any skills you have. Your dashboard will track each student's mastery of each skill.
The weighted average mass of the different isotopes that make up a naturally occurring element is known as the __________.
The unit used for atomic mass is the ____.
The atomic mass unit is defined as ____ the mass of a ______ atom.
The atomic mass of naturally-occurring silicon is 28.086 amu, but there is no atom of silicon with this mass. Why does this happen?
Carbon exists primarily as two isotopes: carbon-12 (12.000 amu, 98.89%) and carbon-13 (13.004 amu, 1.11%), with very small traces of carbon-14. What is the atomic mass for naturally-occurring carbon? Type your answer two three decimal places, followed by a space and the units.
What method is used for the accurate determination of the mass of atoms and molecules?
In mass spectrometry, particles are separated based on how their path changes when they pass through a magnetic field. Which particles are deflected the most by the magnetic field?
The following chart shows the stable isotopes of boron and their abundance in nature. Based on this chart, where would you predict the average atomic mass of boron to be?
The following chart shows the stable isotopes of silicon and their abundance in nature. Based on this chart, where would you predict the average atomic mass of boron to be?
Neon has three naturally-occurring isotopes. Neon-20 has a mass of 20.000 amu (90.92% abundance) and neon-21 has a mass of 21.000 amu (0.26% abundance). If the atomic mass of neon is 20.179 amu, and the third isotope of neon has 8.82% abundance, what is the atomic mass of this third isotope? Type your answer to three decimal places and include the units.
Copper has two naturally-occurring isotopes. Copper-63 has an atomic mass of 62.92960 amu and is 69.17% of natural copper. If the atomic mass of copper-65 is 64.92779 amu, and the average atomic mass of copper is 63.546 amu, what is the percentage of copper-65 in nature. Type your answer to two decimal places and be sure to put the percent sign.
The sum of all the atomic masses of all the elements that make up a substance is called the ____.
What is the formula mass for lithium oxide?
What is the formula mass for barium phosphide?
What is the formula mass for cobalt(II) chloride?
What is the formula mass for aluminum nitrate?