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Exam 2: Atoms and Molecules

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Question 31

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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.

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Question 32

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​ 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) Atomic number
B) mass number
C) Mass number
D) Atomic weight

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Question 33

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

​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? ​

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

How many electrons are found around the species below?

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

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

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) .

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

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.

One mole of O₃ weighs 16 grams.

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

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

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

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

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

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

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