How can carbon 14 and carbon 12 be the same element when both have the same number of protons (6 protons) but different number of neutrons? explain your answer

Shiloh wanted to observe the changes that occurred during an exothermic reaction. He monitored the changes and placed them in a chart.

How many protons and electrons are there in a neutral atom of each of the following elements? a. carbonb. fluorinec. tind. nickel

Identify the characteristics that describe how human proteins are assembled. Check all that apply.

A gas has v = 4.0L, T = 27 degree C and P=2.0 atm. What is the V if T=327 degree C and P=8.0 atm? A 1.0 L B 4.0 L C 3.0 L D 2.0 L E 5.0 L

At equilibrium, 0.170 mol of o2 is present. calculate kc.

How many milliliters of a 0.7% stock solution are required to make 2 l of 0.2% solution? how many ml of solvent will be required to carry out the dilution?

What percentage of the naphthalene molecules emitted a photon?

In an endothermic reaction, heat is absorbed from the surroundings. How does this affect entropy? A. The particles in the surroundings move slower and have decreased entropy. B.

The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change that must happen at the molecular level? A. The molecules move more quickly and their average kinetic energy increases. B.

The most important reason why solid sodium hydroxide is not used as a primary standard is