If element X has 49 protons, how many electrons does it have? Your Answer:

if the charcoal from an ancient fire contains 1/512 amount of carbon-14 as a living tree, how long ago did the fire occur? the half life of carbon-14 is 5730 years

The discovery of atomic structure in the early 1900's was discussed in Chapter 2 of your textbook. One atomic model proposed during this period was the plum pudding model.

If a reaction has a ΔG of - 136kJ at 110°C, will it be spontaneous at this temperature (110°C) ?

X (g) + 4Y (g) →2Z (g), ΔH∘=-75.0 kJ Before the reaction, the volume of the gaseous mixture was 5.00 L. After the reaction, the volume was 2.00 L. Calculate the value of the total energy change, ΔE, in kilojoules.

Approximately how far above the bottom of the Palisades still is the coarse diabase region found?

A chemical spill gets into the soil and effects the plants within a forested ecosystem. explain why the top predators would be most affected by this

If the heat released during condensation goes only to warming the iron block, what is the final temperature (in ∘C∘C) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 kJ/molkJ/mol.)

Which of the following is not a disaccharide? A) sucrose B) maltose C) lactose D) amylose E) all of the above are disaccarides

The process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining large particles

Ice melting, water boiling, lighting a match, grape juice freezing. Which statement describes evidence of a chemical reaction