When must scientist conduct controlled experiments?

Which of these is a primary consumer? Walrus. Sand eel. Greenland shark. Algae.

At STP, iodine, I2, is a crystal, and fluorine, F2, is a gas. Iodine is soluble in ethanol, forming a tincture of iodine. A typical tincture of iodine is 2% iodine by mass.

Adding a neutron to an atom changes what property of the atom? A. the charge B. the volume C. the atomic mass D. the atomic number

Which of the following statements concerning real gases is/are correct? (1) Nonideality in gas behavior becomes more pronounced as the pressure of a gas is decreased.

Which statement best describes elements? A. They are the smallest particles of any material. B. They are composed of only one type of atom. C. They are the most expensive materials on earth. D. They break down easily

What compares a law and a theory?

Explain what domain would best be represented by the "?" in the diagram. A) Eukarya because the organisms are all eukaryotic. B) Eukarya because the organisms are all prokaryotic. C) Bacteria because some of the organisms are autotrophs.

If you are eating a hamburger, it is an example of a consumer eating another consumer. a) true b) false

What mass of NaNO3 is needed to make 3.5 L of 2.2 M solution? (Na = 23.0g, N=14.0g, O=16.0g) Explain in steps

In which group do all atoms have seven valence electrons in the ground state?