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Exam 2: Atoms and Molecules

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Question 31

Multiple Choice

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What is the mass number of a carbon-13 (¹³C) atom?

A) 13
B) 12
C) 6
D) 7

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Question 32

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How many electrons are found around the species below?

A) -2
B) 0
C) 2
D) 4

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Question 33

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One mole of an element would weigh the same as a mole of an isotope of the same element.

A diet is planned for a trip on a space ship and is lacking in milk, but is rich in turnips and broccoli. Such a diet could provide a sufficient amount of calcium for adults.

One mole of O₃ weighs 16 grams.

​Which of the following units can be used to collect a sample of atoms of one element with a mass in grams equal to the atomic weight of another element? ​

Which of the following correctly describes subatomic particles? 1. Mass:   < = n 2. Magnitude of charge:   n = 3. Location:   outside nucleus   ,   , inside nucleus     n

What is wrong with the following molecular formula: SOO (sulfur dioxide) ?

A scanning tunneling microscope (STM)relies on a very strong light source to help see atoms.

How many neutrons are in an atom that has a mass number of 75 and contains 35 protons?

is the form of uranium used to make atomic bombs.  One atom of this isotope consists of ___.

Atoms that have the same atomic number but differ by mass number are called?

One mole of an element would weigh the same as a mole of an isotope of the same element.

​ Which of the following units is the relative mass of a molecule expressed in atomic mass units and is calculated by adding together the atomic weights of the atoms in the molecule?

A mole of copper contains the same number of atoms as a mole of zinc.

If calcium carbonate found in limestone is 40.0% calcium, how many grams of calcium are in 485 g of calcium carbonate?

Refer to a periodic table and tell how many helium atoms (He) would be needed to get close to the same mass as an average oxygen atom (O) .

Calcium supplements can be taken in 1,000 mg increments.

The symbols for all of the elements are derived from the Latin names.

One mole of any substance will contain one Avogadro's number of atoms of that substance.