A teacher wants to perform a classroom demonstration that illustrates both chemical and physical changes. Which would be the best demonstration that she could use?

What is the term? a long, tightly coiled molecule that looks like a twisted zipper inside a cell's nucleus

During convection, hot material then moves to the side and. This circular pattern is called a convection current.

Which of the following atoms will not react with water? A. K B. Li C. Pb D. Na

How many liters of 0.98 M have solution would react completely with 3.5 moles ca (oh) 2

0.103 g of Zn (s) is combined with 50.0 mL HCl in a reaction vessel, the temperature changes from 22.5oC to 23.7oC. What is the ΔHof for the Zn2 + (aq). Use q = CmΔT, the C for liquid water (4.18 J/g oC), and the density of 1.

C3H8 + 5O2 - > 3CO2 + 4H2O According to this equation, which ratio of oxygen to propane is correct? 1 - 5 grams O2 / 1 gram C3H8 2 - 5 moles O2 / 1 mole C3H8 3 - 10 grams O2 / 11 grams C3H8 4 - 10 moles O2 / 11 moles C3H8

Which diagram is the correct electron dot diagram for magnesium?

Which statement best describes electrolysis? Electrolysis stores electrons in an aqueous solution. Electrolysis converts chemical energy into electrical energy. Electrolysis separates protons and electrons in an electrolyte.

Why can xenon expand its octet to form compounds but neon can't

What do we call the group of organisms that share the same characteristics?