What would be an example of a chemical change that took a long time to occur?

Imagine you or your family member experienced a medical emergency. explain two reasons when and why confidentiality would be important to you.

Which of the following groups of chemical elements would you expect to be most alike in their physical and chemical properties?

What element has a half-life = to 64

Which of these is a chemical property of a substance? texture ductility reactivity conductivity

19. Which of the following best describes the role of the spark from the spark plug in an automobile engine? (A) The spark decreases the energy of activation for the slow step. (B) The spark increases the concentration of the volatile reactant.

Bacteria are only found in decaying matter. A. True B. False

Which is considered a chemical mutagen? tanning beds tobacco X-rays precious metals

Combining 0.380 mol Fe2O3 with excess carbon produced 13.7 g Fe Fe2O3 + 3C → 2Fe + 3CO What is the actual yield of iron in moles? What is the theoretical yield of iron in moles? What is the percent yield?

When a hydrogen electron makes a transition from n=3 to n=1?

If two electrons have same number of protons but different number of neutrons can they be atoms of the same element?