What is the most obvious sign of a chemical change in this reaction.

a. a gas was produced.

b. the powder mixed with the water.

c. there was a change in temperature. eliminate

d. the powder dissolved in the water.?

Which of the following is the best definition of baryonic material? A. form of hypothetical energy that makes up most of the universe B. type of matter that we cannot see but that we believe makes up more than 20% of the universe C.

Carbon forms the backbone of every major type of biological molecule, including carbohydrates, fats, proteins, and nucleic acids. how does carbon's high valence relate to its ability to form these large and complex biomolecules?

How could this gravitational potential energy be transformed into kinetic energy? A. He could start the engine. B. He could release the brakes. C. He could push it up the hill. D. all of these

Write a chemical equation representing the first ionization energy for lithium. use e - as the symbol for an electron.

What happens when acid and base are mixed together

Calculate the rate speed per drop in minute when applying a drip of 1000mg to last 4 2 hours

The human male reproduction system is adapted for the production of

If you had 17.3 g of hydrogen and 8.91 g of oxygen, which is the limiting reactant, and how many grams of water could you produce.

Which choice is not a property of an acid? turns litmus paper blue neutralize bases turns litmus paper red corrodes active metals

Samantha is using a lever to lift a rock. To life the rock most easily, where should she apply force to the lever