When an unknown substance is dissolved in water, hydronium ions form. what can you conclude about the substance?
a. the substance is a gas.
b. the substance is a base.
c. the substance is a carbohydrate.
d. the substance is an acid.

The term gas is limited to those substances that exist in the gaseous state at

Ms. sullivan's class is designing a miniature roller coaster. after first setting it up, they find that it didn't have enough speed to go through the loop de loop. instead of taking out the loop, they decide to increase the height of the first hill the coaster goes down, and this adds the speed needed to make it through the loop. what would be a drawback to this plan in real life? a) no one likes loop de loops. b) there is no downside to this plan. c) a higher hill means a scarier ride. d) a higher hill takes more time and material to build.

How to convert 76.6kg to pounds ? ? need asap