Question

3. (1 pts) How many significant figures in the following a) 350.0452 b) 0.004500 4. (2 pts) Convert the following from scientific notation to decimal or vice versa. Use correct sig tigs. a) 3.221 x 10 mm b) 0.000421 ml c) 6.4100 x 10 km d) 66,070 g 5. (2 pts) Mercury in thermometers freeze at -32.5°C. What is the temperature in degrees Fahrenheit? T = 9/5 T +32°F 2.54cm/1") 6. (2pts) Write the equality and conversion factors (ratios for each of the following (ex 1" - 2.54 cm a. One foot is 12 inches b. There are 7 days in a week 7. (2 pts) Magnesium makes up 2.3% of the earth's crust. How many milligrams of magnesium are present in a sample of earth crust that has a mass of 2.5 g 8. (2 pts) You have a graduated cylinder that contains 55 ml of water. You have a cube of aluminum, 2 cm on a side, with a density of 2.70 gm/cm'. After you lower the cube into the water what will the new water level be? 9. (1 pt) Briefly define an element and a compound. Make sure you state the name of the smallest particle that has the properties of each type of matter. VER

Answer 1

Meaningful digits are known as significant figure.

O All nonzero digits are significant 6 Zero between two nonzero digits is significant" The Number which have decimal but less than "1" then sero present between decimal and 1st nonzero digits is nou significant and seroes after nonzero digit are significant" @ 350.0452 7 - significant figure (b) 0.00450g 4 - Significant figure Monsignificans significant