Elements, Compounds, & Mixtures

Elements, Compounds, & Mixtures

YOU NEED TEXTBOOK Get out a sheet of paper and title it Elements, Compounds, and Mixtures Pretest Put your name, date, and period in the top right corner.

It should be quiet when the bell rings or we will do write-offs and you will end up with a HW assignment. (tell your classmates to make good choices so this does NOT happen.) SPI 0807.9.3

Elements & Compounds Bell Work If you havent turned in Fridays assignment (Ch. 9 Sec.2) into the basket please do so.

The assignment is still on the board if you were absent (take a picture of it or write it down, it is due tomorrow) Start a new section in your science

notebook called Elements & Compounds Objective Classify common substances as elements or compounds based on their symbols or formulas. What you already

know!!! Atoms are the smallest unit of an element that maintains the properties of that element. Atoms make up all of the matter on earth. Element

A pure substance that cannot be separated into a simpler substance by physical or chemical means. Has a chemical symbol (He, O, Au). Elements can be the same. (ex. H 2, O2, N2)

Where do you find them? Neon (Ne) Sodium (Na) Chlorine (Cl)

Na + Cl = NaCl (table salt) Compound A pure substance composed of two or more different elements that are chemically combined. Has a chemical formula. (ex.

NaCl, H2O) What are some other common compounds? Common Compounds Compound Can ONLY be separated by

chemical means. Chemical and physical properties are different than the elements that make them. Ex. Salt is composed of sodium and chlorine. Sodium is a soft reactive metal. Chlorine is a greenish toxic gas/liquid.

Na + Cl = NaCl (table salt) 4Fe (iron) + 2O3 (oxygen) 2Fe2O3 (rust) Molecules Molecule- made up of at least 2 atoms. Element (ex. H2, O2, N2) same type

of atom Compound (ex. NaCl, H2O) N 2 (Nitrogen) H 2O (Water) different atoms Element or Compound? 1.

2. 3. 4. 5. Na2Cl Ca AuCl3 O N2

6. 3N 7.H2O 8.Fe2O3 9.Na2 10. CaCo3 <

Objective: Classify =""> common substances as elements or compounds based on their symbols or formulas. Can you do it???

Assessment 1. What is a pure substance that can be separated into two or more simpler substances only by chemical means? A. an element

B. a compound C. a formula D. an atom Assessment 2. A molecule of carbon dioxide is shown below. Based on the drawing of the molecule, what is the chemical

formula for carbon dioxide? A. CO B. 2CO C. C2O D. CO2 Assessment 3.

The chemical formula for glucose is C6H12O6. How many different elements make up one molecule of glucose? A. 1 B. 3 C. 12 D. 24

Assessment 4. Which option contains only compounds? A. B. Na, NaCl, Pb, C6H12O6

NH3, KNO3, Hg, Ne C. Au, Ni, Cu, Fe D.H2O, H2O2, H3O, CO2 Assessment 5. Which substance is classified as an element?

A. B. NaCl CO C. H2O D. Li Assessment A

carbohydrate molecule is shown in the diagram. It is made of carbon, hydrogen, and oxygen. 6. A carbohydrate is __________. A. a compound B. an element C. a mixture D. a solution

Assessment 7. Molecules consist of two or more __________. A. atoms B. protons C. neutrons D. electrons

Assessment 8. Which substance is a compound? A. O3 B. Cl2 C. CH4 D. N2

Assessment 9. Which substance is not a compound? A. N2 B. HCN C. SiO2 D. H2O2

Answer in a complete sentence. Differentiate between an element and a compound. (Whats the difference?) 10.

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