Alkali metals, alkaline earth metals, and aluminum all form ions with positive charges equal to the

a. atomic number.

b. group number.

c. period.

d. atomic mass.

Which of the following has the ability to allow water to flow through

20 mL of 80°C water is mixed with 20 mL of 0°C water in a perfect calorimeter. What is the final temperature?

The volume of a gas increases when its temperature increases because

Neon atom can exist freely in mature but sodium atom can not, why

Name three parts of a plant cell that are not found in an animal cell

For the reaction: C (CH3) 3I + Cl - → C (CH3) 3Cl + I- What is the activation barrier for the SN2 reaction mechanism, in units of kcal/mol? Provide your answer to the nearest 0.1 kcal/mol.

Which of the following utilizes the measurement of a short - or long-lived radioactive element, with its decay product, to determine the absolute age of an object? A. varves B. radiometric dating C. dendrochronology

A student-made sample of sodium carbonate weighing 0.169g that generates 37.6 mL of CO2 gas when treated with sulfuric acid. The atmospheric pressure in the lab is 731.8 mm Hg and the temp. is 21.3-degree Celsius. A.

In order to understand the prehistory of the Hawaiian island of Lana'i better, anthropologists Maria Sweeney, Melinda Allen, andBoyd Dixon used radiocarbon dating on charcoal found in an ancient dwelling site, the Kaunolu Village National Historic

German scientist alfred wiener is best known for what hypothesis?