Which of the following is a sign of a chemical reaction?

Explain how elements are arranged on the periodic table. In other words, explain why they are not just listed in one long list, but are instead grouped into rows and columns.

Baking a cake is an example of - a. forming mixtures. b. forming solutions. c. exothermic reactions. d. endothermic reactions.

A type of erosion that occurs when large chunks of land or rock break away due to gravity. A. mass wasting B. mud slide C. rock slide D. hurricanes

Honey is a solution of two sugars glucose and fructose once the jar has been opened

1.) How many periods are on the periodic table? Are periods the columns or the rows on the periodic table?

In natural convection heat transfer, the parameter is the Choose the right answer a) Nusselt number b) Rayleigh number c) Grashof number d) Lewis number

An insulator: A. Conducts heat well B. Does not conduct heat well C. Is used to heat cold objects D. Is used to cool hot objects

Which of the following choices would have a negative entropy change? A. N2 (g) + 3H2 (g) - >2NH3 (g) B. CaCO3 (s) - > CaO (s) + CO2 (g) C. H2O (s) - > H2O (l) D. Fe2O3 (s) + 3C (s) - > 2Fe (s) + 300 (g)

Increasing the temperature of a liquid-solid solution will:

What is the most abundant substance dissolved in sea water? magnesium chloride sodium chloride