You are looking at an atom that has the atomic number of 7 and an atomic mass of 16. how many neutrons are there in this atom?

In an isolated system: O A. total (PE + KE) is unchanged. KE remains the same. O c. matter flows in and out. PE remains the same.

Which of the following reactions is the least energetic? Question 18 options: ATP + H2O → ADP + Pi ATP + H2O → AMP + PPi AMP + H2O → Adenosine + Pi ADP + H2O → AMP + Pi All give off the same amount of energy.

Why do sunspots appear darker than their surroundings? A. They are masked by dust and gas passing between Earth and the Sun. B. They are warmer than their surrounding environment. C. They are cooler than their surrounding environment. D.

Initial Concentration mol/L[A] Initial Concentration mol/L[B] Initial Rate mol/Ls 0.20 0.10 20 0.20 0.20 40 0.40 0.20 160 Given the data in the accompanying table, what is the rate law for the reaction?

The pressure of a refrigerant cylinder containing saturated refrigerant is determined by what

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?

A car is driven through streets treated with salt and then parked in a warm garage. a) How will the rate of rusting compare with a car that has not been driven in the streets treated with salt but left parked outside?