Can mass be a negative number

How do enzymes lower the activation energy of a reaction? select one: a. they provide heat to the reaction b. they facilitate the reaction to occur c. they provide additional hydrogen ions?

Magnesium nitride is formed in the reaction of magnesium metal and nitrogen gas. 4.0 mol of nitrogen is reacted with 6.0 mol of magnesium. The result is ... a. 2.0 mol of magnesium nitride and 2.0 mol excess nitrogen b. 4.

A helium gas balloon is expanded to 78.0 L, while the pressure is held constant at 0.37 atm. If the work done on the gas mixture was 28.2 J, what was the initial volume (in liters) of the helium gas balloon. (1 L. atm?

The density of a 0.75M NaOH solution is 1.1g/ml. Calculate the mass percent of NaOH in the solution

Ken wrote a few steps to describe how carbon circulates between the atmosphere and living organisms. Step 1 is missing.

Based on the passage, where in the United States would a physician encounter the most cases of SAD?

Draw the alkyne formed when 3,4-dichloroheptane is treated with an excess of strong base such as sodium amide

A penny has a mass of 2.50g and the moon has a mass of 7.35 X 10^22 Use this information to answer the questions below. Be sure your answers have the correct number of significant digits.

If a car tire has a diameter of 3232 inches, what is the approximate circumference of the tire?

9) Bettina spoke into a microphone during the school play to increase the sound of her voice so the audience could hear her speak.