Is the process of bananas ripening a chemical change or a physical change?

Explain at the molecular level why the pH increases as NaOH is added to HNO3 (titration)

A student wants to make 5.00% solution of rubidium chloride using 0.37 g of the substance. what mass of water will be needed to make the solution?

Which of the following best explains what happens when the kinetic energy of particles in a liquid state decreases? A. They move so slowly that the particles are no longer held together, resulting in the formation of a gas. B.

Why are comets unlikely to be able to support life? A. A comet's environment is not stable. B. A comet does not have an atmosphere. C. A comet does not have a reliable energy source. D. all of these

How long have people studied chemistry? A. Since chemicals were discovered B. Since fire was discovered C. Since the atom was discovered D. Since gravity was discovered

What are some differences between insect larvae and worms?

Suppose that 100 grams of water at 50.0°C is placed in contact with 200 grams of iron at 30.0°C. The final temperature is 46.5°C. The specific heats of water and iron respectively, are 4.18 and 0.45 joules per gram times Celsius.

What type of overall charge, if any, does the balloon in Diagram B have? Explain how you determined your answer.

Move deep below the ocean's surface

The Ka of an acid is 1.3 x 10^-7. Based on the Ka and its relationship with Kw, what is the value of Kb? Use KaKb=Kw 1.3 x 10^-21 7.7 x 10^-15 1.3 x 10^-14 7.7 x 10^-8