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Exam 2: Atoms, Elements, and Compounds

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Question 41

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Based on the text periodic table and using the correct number of significant figures, enter the appropriate number in the blank. The mass of 5.00 mol of oxygen atoms is _____________g.

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Question 42

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Use one the following terms to complete the given statement. salt sugar vegetable oil When ____________________ is added to water a heterogeneous mixture forms.

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Question 43

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Fill in each blank with the appropriate term from the list given below. protons neutrons electrons valence electrons -¹⁴N and ¹⁵N have the same number of _____________________.

What is the mass of one mole of glucose, C₆H₁₂O₆?

The elements sodium, potassium, and oxygen are considered to be "elements of life" and are in the category of electrolytes.

Which of the following correctly describes a proton on a subatomic scale?

An element has the following electron arrangement. shell 1: 2 electrons shell 2: 8 electrons shell 3: 18 electrons shell 4: 18 electrons shell 5: 7 electrons The Lewis structure for this element would be:

Elements in the same period of the periodic table generally show similar chemical behavior.

Group 4A and Group 14 are two different designations for the same column of the periodic table.

Enter the chemical symbol of the element in the blank. Calcium forms the compound CaF₂ . What other alkaline earth element with a smaller atomic mass would form a compound with a similar formula? Chemical symbol:_____________________.

What is the formula weight of ibuprofen, C₁₃H₁₈O₂?

An isotope of gallium consisting of 31 protons and 37 neutrons can be represented using the symbol shown below. gallium-37

An element is a shiny gray solid that can be pressed into a thin sheet. This element is probably a metalloid.

Which of the following is the correct unit for the formula weight of a large number of atoms?

A sealed cylinder is filled with a large collection of atoms that have 14 neutrons and 13 protons. Which of the following would behave in a manner similar to this collection of atoms?

Enter an integer number (1, 2, 3, ...) in the blank. Sucrose (table sugar) has the formula C₁₂H₂₂O₁₁. A sample of sucrose contains 2400 carbon atoms. How many formula units does this represent? ____________________formula units.

Enter an integer number (1, 2, 3, ...) in the blank. How many electrons are in shell 2 of a P atom? ____________________electrons