1. Human saliva has a pH of 6 while the contents of the stomach has a pH of 2. How much greater is the concentration of hydrogen ions in the stomach over that in saliva

Question 5 Unsaved Which of the following changes can alter the form of a substance but does not necessarily change it to an other substance? Question 5 options: physical changes pressure changes temperature changes all of the above

What are metals that have been mixed together called?

What is the principle called the conversation of matter

Explain how you could experimentally determine whether the outiside temperature is higer or lower than 0 degree centigrade (32f) without using a thermometer.

A manufacturer of bicycles has 4250 wheels, 2755 frames and 2255 handlebars. How many bicycles can be manufactured using these parts? a. 2125 complete bicycles b. 2255 complete bicycles c. 2755 complete bicycles d. 4250 complete bicycles e.

Combining aqueous solutions of bai2 and na2so4 affords a precipitate of baso4. Which ions are spectator ions in the reaction?

Which kind of wave increases in height due to strong winds?

Solid lead IV oxide decomposes into solid lead and oxygen gas.

Ab2 has a molar solubility of 3.72*10-4 m. what is the value of the solubility product constant for ab2? express your answer numerically.

Thermal decomposition of sodium azide (NaN₃) into nitrogen gas and sodium metal is used to inflate car airbags. The reaction proceeds by the following chemical reaction. 2NaN₃ (s) ⟶3N₂ (g) + 2Na (s) How many grams of NaN₃ are need to inflate a 10.