Unit 1 Homework

Chemistry Homework, Unit 1 Mr. Bartelt 1) Briefly explain the difference between basic research and applied research. 2) a) List 3 intensive properties.

b) List three extensive properties

3) Define compound 4)

a) List three examples of a physical change b) List three examples of a chemical change

5) List the properties of a) Metals b) Non-metals c) Metalloids d) Noble Gasses 6) What is the difference between a heterogeneous and homogeneous mixture? 7) What is the difference between a period and a group in the periodic table? 8) Determine if each statement is qualitative or quantitative. a) The ball is red b) The ball reflects photons with wavelengths between 650-700 nm 9) List 2 units of a) Length b) Volume c) Density d) Time. 10) Indicate the number of sig figs in the following numbers and put them into scientific notation a) 8500 b) 60501.0 c) .00490 11) Being sure to use the correct number of sig figs and units, find: a) The area of a 8.5 inch by 11 inch sheet of paper. b) The density of a rock with volume 35.00 ml and a mass of 20 grams. c) The average speed of a car that travels about 500 miles in 12.3158 hours. 12) Explain the difference between a pure substance and an element. 13) In the reaction below, label the products and the reactants

CH 4 + 2O2 → CO2 + 2 H 2 O

14) Draw 2 diagrams show high accuracy and low precision and vice versa.