The cell membrane responds to chemical signals from other cells A) true B) false

Describe what you would do to prepare 100.0g of a 3.5% solution of ammonium sulfate in water.

Which idea did john dalton include in his atomic theory? a. all atoms are the same size. b. atoms of the same element are identical. c. each atom has a dense, positive nucleus. d. atoms can gain or lose electrons to become ions.

If an atom has no electric charge, what can be said about the number of protons and electrons it contains?

There are many sources of air pollution in the united states and around the world. Some are natural sources, and other come from human activities. Which of these examples is a natural source of air pollution? A.) car exhaust fumes B.

Explain in terms of particle arrangement why nacl (aq) is a homogeneous mixture

A substance contains 36.1 percent calcium and 63.9 percent chlorine by weight. What is the empirical formula of the given compound? A. CaCl B. Ca0.9Cl1.8 C. CaCl2 D. Ca2Cl4

A sample of bismuth weighing 0.687 g was converted to bismuth chloride by reacting it first with HNO3, and then with HCI, followed by careful evaporation to dryness. The mass of the bismuth chloride obtained was 1.032 g.

When 1 g of sodium chloride (NaCl) is placed in 100 g of water, a solution results. Once the solution is prepared, water is now considered what part of the solution?

1. How is pressure affected as depth increases? 2. As the sun heats the surface of the oceans, two layers of water result. What separates the layers? 3. How is temperature affected when? (a) the depth increases (b) the latitude increases 4.

Are nails in a jar with water a chemical change