When baking soda (NaHCO3) and vinegar (HC2H3O2) react, one of the products is carbonic acid (H2CO3). Carbonic acid rapidly decomposes into carbon dioxide gas (CO2) and water (H2O), which are two of the compounds found in volcanic gas. In this experiment, you’ll measure how these gases alter temperature. Before starting the experiment, predict how you think the presence of CO2 and H2O will affect temperature. Explain your reasoning.

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments