Measurements  A measurement is a determination of the amount of something.  A measurement has two parts:  number value  unit  Always include the correct units with number values.  forms a base-10 or decimal system.  built upon seven metric units  Derived units are made from combinations of base units.

Scientific Notation a x 10 n where a is between 1 and 10 and n is an integer Original number is less than 1, the exponent is negative x Original number greater than 1, exponent is positive 1)Write in scientific notation. 2) Express 1.8 x in decimal notation. 3)Express 4.58 x 10 6 in decimal notation. 4) Write x 10 5 in scientific notation.

Bellringer Write the mineral number on the board Write your group’s mass Calculate the average mass for each mineral Keep in your lab notebook. Write mass on the board If you are waiting for others to finish, finish any missing assignments Agenda Notes on SI units Worksheet on Metric Conversion Density Worksheet If time, start penny density lab

Make 2 tables. One if Pre 82, other is Post 82 Number of Pennies Mass of Pennies Initial Volume (mL) Final Volume (mL) Volume (mL) 520 mL 1020 mL 1520mL 2020 mL

Object Description Initial Water (mL) Displaced Water (mL) Actual Volume (mL) Mass (g)Density (g/mL)

Suggest the most probable identity of the unknown metal using the chart to the right. Include an explanation of your logic. How would the density of 10 pre-1982 pennies compare to the density of 20 pre pennies? Explain your answer. HINT: Think about what type of property density is! Explain why so many pennies were used for measurements. Why not use 1, 2, 3, and 4 pennies rather than 5, 10, 15, and 20? MetalDensity g/mL magnesium1.74 aluminum2.70 zinc7.13 Copper8.92 silver10.50 lead11.35

Bellringer Pick up from the front: graphing worksheet Graph line and circle graph For the line graph, make sure you use consistent intervals…each line counts as 2. Label the x and y axis For the circle graph, you need to use percentages. Number of votes/total number of votes…Example 2/20= 10% Place in basket to be graded. Finish your states of matter collage Total of 10 pictures for solid, liquid, gas. Write beside each paper which state of matter it is On back, give 3 characteristics of each state of matter pg. 67&68 Everything completed by 9:45 Everyone caught up: lab tomorrow Test on Friday: Scientific Method, Graphing, Metric Conversions