Which of the following is the best indication that a chemical change has taken place?

a. The matter changes color.

b. A mixture separates into layers.

c. The change is reversible.

d. The shape of the substance changes.

Carbon dating requires that the object being tested contain

If a neutral atom has a mass of 15 amu and an atomic number of 7, determine the number of protons, neutrons, and electrons in the atom.

A sample of argon gas is at a pressure of 1.725x10^4 kPa and a temperature of 24°C in a rigid 20 L tank. How many moles of argon does this tank contain? (show your work)

What is the name of the particles that make up all matter?

Diffusion is when water is transferred through a plant. carbon is transferred from water to the atmosphere. cells are shifted throughout the organism. molecules pass from low concentration to high concentration.

What is it called when energy is created without oxygen?

If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 Kelvin and 1.40 atmospheres? Show all of the work used to solve this problem. 2Li (s) + 2H2O (l) - > 2LiOH (aq) + H2 (g)

How did coroners handle their responsibilities in the early 1900s? Why was there a need for significant change in the job?

Which of the following is the best indication that a chemical change has taken place? a. The matter changes color. b. A mixture separates into layers. c. The change is reversible. d. The shape of the substance changes.

This is not lost in a chemical Reaction (4 letter word second letter is A)