8. When using the scientific notation system to express large numbers, move the until digit(s) remain(s) to the left, then indicate the number of moves of the decimal point as the

9. When a measurement is recorded, it includes the
are certain plus one uncertain digit.
a. Major figures
b. Significant figures
c. Relative figures
d. Relevant figures
10.The is based on the lowest theoretical temperature, called
a Kelvin scale, absolute zero
b. Celsius scale, absolute zero
c. Kelvin scale, boiling point of water
d. Centigrade scale, freezing point of water

Which sentence best describes the formation of igneous rock? a- lava on the surface dries up and makes arock b_melted rocks cools and forms crystals c_rocks under tremendous heat and pressure d_magma is melted rock underground

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next

Gusing the milligrams of ascorbic acid you entered above, the ratio of total sample volume to aliquot volume, and the total milligrams of the vitamin c tablet that you dissolved, calculate the mass of ascorbic acid in the vitamin c tablet for each trial. do this by scaling up to find the amount (mg) of ascorbic acid in your 250 ml flask. enter your calculated mass of ascorbic acid in the vitamin c tablet, for each trial. be sure to enter your calculated mass in the corresponding order that you entered your milligrams of ascorbic acid. the milligrams of ascorbic acid you entered for entry #1 previously should correspond to the mass of ascorbic acid that you enter for entry #1 here.