Chemistry Performance Final

In order to mass an object directly what must you do?

• Turn on the balance.

• Push the ZERO/TARE button.

• Place the object on the balance and read the mass.

• All of the above.

When you turn the balance on the reading is 0.00 g. What does the (g) stand for?

• gallon

• gigabyte

• gravity

• gram

• Helium - 3

• Hydrogen - 3

• Helium - 1

• Hydrogen - 1

What is the symbol for an isotope with 95 protons and 146 neutrons?

• 146

  Am

  95

• 95

  Am

  146

• 95

  Am

  241

• 241

  Am

  95

• 24

• 10

• 12

• 38

What isotope has 56 protons and 76 neutrons?

• Barium-20

• Barium-56

• Barium-76

• Barium-132

• 235

• 92

• 143

• 327

The element chlorine has two naturally occurring isotopes, chlorine-35 and chlorine-37. The average atomic mass of chlorine listed on the periodic table of the elements is 35.453 amu. Which naturally occurring isotope, chlorine-35 or chlorine-37 is the most abundant?

• The most abundant isotope is chlorine-35 because the average atomic mass of the element is closer to its mass.

• The most abundant isotope is chlorine-37 because it has a greater mass.

• The most abundant isotope is chlorine-37 because it has more neutrons, resulting in more distance between the protons.

• The most abundant isotope is chlorine-35 because it has fewer protons.

An element has two naturally occurring isotopes. One is 106.905 amu and is 52% abundant. The other is 108.905 amu and is 48% abundant. What is the average atomic mass and element?

• 107.905 amu, Silver

• 107.865 amu, Silver

• 107.905 amu, Bohrium

• 107.865 amu, Bohrium

What information is necessary to determine the average atomic mass of chromium?

• The mass of each naturally occurring isotope of chromium.

• The relative abundance of each naturally occurring isotope of chromium.

• The atomic number of each naturally occurring isotope of chromium.

• The mass and the relative abundance of each naturally occurring isotope of chromium.