Exam 2: Atoms, Elements, and Compounds

Based on the text periodic table and using the correct number of significant figures, enter the appropriate number in the blank. There are _______mol is 72.36 g of citric acid, C₆H₈O₇.

Convert the following number of moles into the corresponding mass. 5.22 mol Br

If the atom ratio of Na to N in a compound is 3: 1, the mole ratio of Na to N is 3:1.

What is the formula weight of ibuprofen, C₁₃H₁₈O₂?

How many moles of sulfur are there in a 0.685-g sample of sulfur?

If 1 mol of an element has a mass of 63.54 g, the symbol for this element is

What are the horizontal rows of the periodic table called?

Based on the text periodic table and using the correct number of significant figures, enter the appropriate number in the blank. There are _______mol is 54.05 g of boron.

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 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: _____________________.

Enter the chemical symbol of the element in the blank. 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: 4 electrons The reactivity of this element would most closely resemble that of which element? Chemical symbol: _____________________

Enter the chemical symbol of the element in the blank. An element in period 3 has the Lewis structure: X should be replaced with what chemical symbol? Chemical symbol: _____________________.

What is the mass number of an atom that is made up of 38 protons, 52 neutrons and 38 electrons?

What are the elements in the "A" columns of the period table called?

Consider the atomic view of a substance shown below. This substance would be classified as a(n)

Sodium chlorate, an ingredient in many common herbicides, has sodium, chlorine and oxygen atoms in the ratio 1: 1: 3, respectively. What is the formula unit for sodium chlorate?

How many moles of oxygen would be required to make 4 mol of the following compound? P₄O₁₀

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

What is the meaning of the subscripts in the formula for ethyl alcohol, C₂H₅OH?

Based on the text periodic table and using the correct number of significant figures, enter the appropriate number in the blank. The mass of 7.00 mol of sodium chloride, NaCl, is _____________g.