Which of these is a base? a-vinegar b-ammonia c-HCl d - HNO3

How does sound travel

You are a pre-K teacher, starting a new year with a class of four - and five-year-olds. You have begun to notice that during class time, four-year-old Josh stays focused only when using some form of electronic media, such as when he is watching a

What is the most basic unit of matter

Density is an intensive physical property because the density of a given substance does not change with the size of the sample. True or False

The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half life of 3.3 hours. if 1 gram of this isotope is present initially, how long will it take for 90% to decay?

Compare the advantages and disanvantage of fossil fuel use

If all of the forces acting on a car are balanced, then: A. the direction the car is moving will not change. B. the car will speed up. c. the velocity of the car will increase. D. the acceleration of the car will be negative.

Explain the hydrogenation of oil

A bucket of water with dry ice is not making fog fast enough. As a special effects expert, how could you make the fog form faster in the bucket?

What is the term for a solid that forms when two liquids are mixed together? A. a reactant B. an energy source C. a precipitate D. a solute