Which kind of investigations never include a hypothesis?

experimental

systemic

descriptive

comparative

A cube of copper has a temperature of 5°C. The cube is placed in a closed container whose internal temperature is 85°C. What will happen over time? Heat will flow from the cube into the air in the container.

Compared to an atom of phosphorus-31, an atom of sulfur-32 contains (1) one less neutron (3) one more neutron (2) one less proton (4) one more proton

What is transmutation? the conversion of atoms of one element to atoms of another the movement of protons from one nucleus to another the movement of alpha, beta, and gamma particles through a solid rapid nuclear decay caused by exposure to alpha

What substances decrease the h + ion concentration in a solution?

An arrhenius acid has A only hydroxide ions solution b only hydrogen ions solution c hydrogen ions as the only positive ions in solution d hydrogen ions as the only negative ions in solution

Iodine pentafluoride gas reacts with iodine fluoride gas producing iodine heptafluoride gas and iodine gas. What is the maximum number of grams of iodine gas that can be produced from a reaction of 10.0 g of iodine pentafluoride with 11.

What evidence of a chemical reaction might you see in dropping an Alka-Seltzer tablet into a glass of water?

State hess's law. how is it used

When the name of a molecule ends in - ose, the molecule is a

How many moles are in. 12 grams of gold.