Section 2.1 Worksheet - class practice assignment PDF

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The Elements Define a chemical element and give examples of the abundance of different elements 1. What is an element? An element is the basic chemical building block of matter; it is the simplest chemical substance 2. Give some examples of how the abundance of elements varies. Elements vary from being a small percentage to more than 30% of the atomic around us 3. Which of the following substances are elements? a. Paper b. Electricity c. Neon d. Carbon e. Wood f. Concrete Represent a chemical element with a chemical symbol 4. Why are chemical symbols so useful? What is the source of the letter(s) for a chemical symbol? Chemical symbols are useful to concisely represent the elements present in a substance. The letters usually come from the name of the element 5. Write the chemical symbol for each element without consulting Table 2.3. a. Manganese b. Magnesium c. Neon d. Nitrogen e. Silver a. Mn b. Mg c. Ne d. N e. Ag 6. Write the chemical symbol for each element. a. Bromine b. Oxygen c. Sulfur d. Lithium e. Boron a. Br b. O c. S d. Li 7. What element is represented by each chemical symbol? a. Pb b. Sn c. U d. O e. F a. Lead b. Tin c. Uranium d. Oxygen e. Fluorine

e. B

8. Explain why it is improper to write CO as the chemical symbol for cobalt. By convention, the second letter in an element’s symbol is always lowercase. Cobalt is written as Co, while CO is the shorthand notation for carbon monoxide. 9. Explain why it is improper to write NO as the chemical symbol for nobelium.

By convention, the second letter of an element’s symbol is always lowercase. Nobelium is written as No, while NO is the shorthand notation for nitrogen monoxide. 10. Complete the following table. Element Symbol Element Name F Fluorine Fe Iron I Iodine Cr Chromium C Carbon P Phosporous Element Symbol Mg Mn Ca Cl K Pt

Element Name Magnesium Manganese Calcium Chlorine Potassium Platinum

ANSWER KEY 1. An element is the basic chemical building block of matter; it is the simplest chemical substance. 2. Elements vary from being a small percentage to more than 30% of the atomic around us 3. a. not an element b. not an element c. an element d. an element e. not an element f. not an element...