are our best clues about the history of life on Earth, what is the answer? also there are no options but it has to a word that has 11 letters in it

The first step in the ostwald process for producing nitric acid is as follows: 4nh3 (g) + 5o2 (g) ? 4no (g) + 6h2o (g). if the reaction of 15.0 g of ammonia with 15.0 g of oxygen gas yields 8.

Describe how you think the tiny dust particles acquired a charge.

A pencil sharpener contains which simple machine Block and tackle Lever Wheel and axle Pulley

Sodium metal is quiet soft whereas sodium chloride crystals are quiet hard explain why

Steve holds the world record for the 100-meter dash. At his fastest, Bolt ran 100 meters in 9.58 seconds. Convert his speed into miles per hour. Report your answer using 3 significant figures.

One gram of lipid yields about 9kcal of energy. that is due to the high abundance of which chemical element?

Which of the following happens during a chemical change? Check all of the boxes that apply 0 One atom or more changes into atoms of another element. New substances with different properties are formed. O Solids, liquids, or gases may form.

The energy derived from the movement of H + ions down an electrochemical gradient from the intermembrane space into the matrix is used to drive the synthesis of ATP. How many H + ions must be moved into the matrix for the synthesis of 1 ATP?

Consider two solutions, solution a and solution b. [h+] in solution a is 370 times greater than that in solution b. part a what is the difference in the ph values of the two solutions?

All of the following are possible sources of error in a scientific investigation except for O measuring materials such as mass and volume incorrectly. o recording experimental data incorrectly. o having a constant in your experiment.