Why might you use a plastic replica of a cell in biology class instead of real cells?

A molecule of an organic compound contains at least one atom of

The ability to attract an electron for bonding is called: A. Electrostatic attraction B. Electronegativity C. Delocalized electron attraction D. Polar bonding

Experiment:phase changes, what was the temperature of the ice before you added heat?

Gaps in rock layers that develop when agents of erosion remove existing rock layers

In a hydrogen atom, what color is the emission line observed when electrons drop from the fifth to the second energy level?

Which of the following equations describes a single-replacement reaction? A. 2N2O5 (g) = O2 (g) + 4NO2 (g) B. 2Na (s) + Cl2 (g) = 2NaCl (s) C. Cl2 (g) + 2Kl (s) = 2KCl (s) + l2 (g) D. H2 (g) + Br2 (g) = 2HBr (g)

What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.50*1015Hz1.50*1015Hz? Express your answer in joules to three significant figures.

Using your knowledge of symbols, determine which compound listed must contain both copper and oxygen. a. glucose, C6H12O6 b. chalcopyrite, CuFeS2 c. malachite, Cu2CO3 (OH) 2 d. calcite, CaCO3

Molecules move most slowly in: solids liquids gases compounds

When limestone (solid) is heated, it decomposes into lime (solid) and carbon dioxide gas. This is an extremely useful industrial process of great antiquity, because powdered lime mixed with water is the basis for mortar and concrete - the lime