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Exam 2: Atoms, Elements, and Compounds

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Question 21

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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:_____________________

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Question 22

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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?

A) NaCO₃
B) SoClO₃
C) NaClO₃
D) none of these

E) All of the above
F) C) and D)

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Question 23

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Naturally occurring lithium (Li) consists of only two isotopes, Li-6 (6.02 amu) and Li-7 (7.02 amu) , where the exact isotopic masses are given in parentheses. Use the periodic table and determine which isotope is present in the larger percentage in the natural element.

Write the chemical symbol for the elements that is in period 2 and group 8A of the periodic table.

When a particular solid sample is examined under a microscope, it is observed that there are regions that are black and regions which are yellow. What type of matter is this sample?

An elements with an electron arrangement of: shell 1: 2 electrons shell 2: 8 electrons shell 3: 18 electrons shell 4: 18 electrons shell 5: 7 electrons would have 1 valence electron.

Indicate the number of dots that should be placed around the Lewis symbol for the following element. Use an integer: 1, 2, 3, etc. as appropriate. Br

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:_____________________.

The atomic weight of phosphorus (P) is 30.91 amu or about 31 amu. This indicates that each P atom consists of 15 protons and 16 neutrons.

Electron shells define a region in space around the nucleus occupied by certain electrons.

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.

A person drinks 1900 g of water, H₂O, per day. How many moles of water did they consume?

Use the periodic table to determine about how many helium atoms (He) on the average would be needed to get close to the same mass as an oxygen atom (O) .

Sodium is a highly reactive metal and chlorine is a toxic gas, but when they come together the resulting material, sodium chloride (a white solid) , is essential for life. Which of the following is true when sodium and chlorine are brought into contact with one another?

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

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.

Neutral isotopes of the same element have the same number of electrons.

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

The electron arrangement for Na would be: shell 1: 2 electrons shell 2: 8 electrons shell 3: 1 electron

In 22.99 g of Na there is 6.022 × 10²³ atoms of Na.