Chapter 2 Homework Flashcards

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1

Match the element names with their symbols

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2

Match the element names with their symbols

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3

What family does calcium belong to on the Periodic Table?

  • Halogen
  • Nobel Gas
  • Alkali Metal
  • Transition Metal
  • Alkaline Earth Metal

Alkaline Earth Metal

4

What family does Bromine belong to on the Periodic Table?

  • Transition Metal
  • Alkali Metal
  • Alkaline Earth Metal
  • Halogen
  • Nobel Gas

Halogen

5

How many electrons, protons and neutrons are in 1 atom of Tin?

Mass number is 118

1._______ electrons

2._______ protons

3._______ neutrons

1.____50___ electrons

2.____50___ protons

3.____68___ neutrons (118-50= 68)

6

How many electrons, protons and neutrons are in 1 atom of Uranium?

Mass number is 238

1._______ electrons

2._______ protons

3._______ neutrons

1.____92___ electrons

2.____92___ protons

3.____146___ neutrons (238-92= 146)

7

When you diagram an atom of silicon you have

______ electrons in the first row,

______ electrons in the second row and

______ electrons in the third row. The answers are all numbers.

___2___ electrons in the first row,

___8___ electrons in the second row and

___4___ electrons in the third row.

8

Nitrogen has this many valence electrons (answer with a digit). _______

5

Ex. Finding the Number of Valence Electrons for an Element

https://www.youtube.com/watch?v=x1gdfkvkPTk

9

Fluorine has this many valence electrons (answer with a digit). _______

7

Ex. Finding the Number of Valence Electrons for an Element

https://www.youtube.com/watch?v=x1gdfkvkPTk

10

Convert 32.00 grams of Ni (OR "N" i) to moles. Do not type units with your answer.

The atomic weight of Ni (OR "N" i) is 58.69 grams/mol

0.5452

11

Convert 0.532 moles of K to grams of K. Do not type units with your answer.

The atomic weight of K is 39.10 grams/mol

20.8

12

Convert 393.00 grams of Ba (OR B a) to moles. Do not type units with your answer.

The atomic weight of Ba (OR B a) is 137.33 grams/mol

2.8617

13

Convert 0.280 moles of Ca (OR C a) to grams. Do not type units with your answer.

The atomic weight of Ca (OR C a) is 40.08 grams/mol

11.2

14

Convert 98.50 grams of Au (OR A u) to moles. Do not type units with your answer.

The atomic weight of Au (OR A u) is 196.97 grams/mol

0.5001

15

Assume a hypothetical element X consists of 3 naturally occurring isotopes. The first isotope has a percent abundance of 56.34% and a mass of 45.45 amu. The second isotope has a percent abundance of 30.23% and a mass of 48.37 amu. The third isotope has percent abundance of 13.43% and a mass of 49.81 amu.

What is the average atomic weight of element X? Report your answer to two decimal places and do not include units.

Note: Element X does not exist so you will not find it on the periodic table.

46.92

(45.45)(0.5634)+(48.37)(0.3023)+(49.81)(0.1343)= 46.92

Ex.

Calculate the average atomic weight when given isotopic weights and abundances
Fifteen Examples

Example #4: How to Calculate an Average Atomic Weight

https://www.chemteam.info/Mole/AverageAtomicWeight.html

Another good one for a similar (NOT THE SAME) problem:

Calculate the isotopic abundances when given the average atomic weight and the isotopic weights

Sixteen Examples

https://www.chemteam.info/Mole/AvgAtomicWt-Reverse.html