1. If an acid is splashed on your skin, wash at once with A) soap B) plenty of water C) weak base D) lotion 2. You are heating a substance in a test tube. Always point the open end of the tube……… A) toward yourself B) toward your lab partner C) toward another classmate. D) away from all people. 3. Write the number of 8300 in scientific notation, A) 83 102 B) 8.3 x 103 C) 8.3 x 10- 3 D) 83 x 10-2 4. Written the number 0.000 000 33 in scientific notation, A) 3.3 x 10-7 B) 0.33 X 10-9 C) 3.3 * 108 D) 33 x10-8 5. How many significant figures (digits) are in the number 0.002080? A) seven B) three C) four D) six 6. A calculator answer of 424.60 must be rounded off to Two significant figures. What answer is reported? A) 423 B) 424 430 D) 420 7. What is the correct answer for the following calculation: ml? A) 0.22 ml B) 0.223 mL C) 57 ml D) 14 ml 8. What is the correct answer for the following calculation: 2.35+1.228 x 0.62? A)3.11136 B) 3.111 3.1 D) 3.11 9. A student performed an experiment and recorded the volume of the object is 53.00 ml, which has a density of 0.79 g/mL., then what is the recorded mass in grams? A) 67.1 g B) 41.98 C) 42 D) 67 g 10 A student performed a density lab, three different solution is given for this lab. A solution has a density of 0.568 g/mL, B solution has a density of 1.88 and C solution has a density of 1.00 g/mL. Then three solutions are poured into a beaker. The prediction of layers (tope to the bottom of the solutions in the beaker will be… A) ABC B) CBA C) CBA D) ACB

## Answer

1. Wash with SOAP Acid is placed on the skin so soap will neutralize the acid and try to minimise the injury. 2., Away from all One should always keep the another end of the test tube away from all in the lab to avoid any misfortunate incident. 3. B… 8.3*10^3 4.A…3.3*10^ – 7 5. C… 4 Always Zeroes preceding a non zero number are not included in significant figure calculations.

6. D. 420