During a flame test, sodium chloride produces an intense yellow flame. This yellow color is produced when electrons in excited atoms

• are gained by the atoms

• are lost by the atoms

• move to higher energy states within the atoms

• move to lower energy states within the atoms

As the elements in Group 2 in the periodic table are considered in order of increasing atomic number, there is a general increase in

• stability

• atomic radius

• electronegativity

• first ionization energy

Under which conditions does a gas behave least like an ideal gas?

• high temperature and low pressure

• high temperature and high pressure

• low temperature and low pressure

• low temperature and high pressure

• fermentation
• combustion
• saponification
• substitution

• addition
• polymerization
• esterification
• fermentation

Which substance is most soluble at 40 degrees Celsius?

• KCl

• KNO₃

• NaCl

• NH₃

What is the molarity of 0.50 liter of an aqueous solution that contains 8 grams of NaOH (gram-formula mass = 40. g/mol)?

• 0.1 M

• 0.2 M

• 2.5 M

• 0.4 M

what is the molarity of a solution that contains 125 g NaCl in 4.00 L of solution? (gfm = 58 g)

• 0.535 M NaCl

• 2.14 M NaCl

• 8.56 M NaCl

• 31.3 M NaCl

A saturated solution of NaNO3 is prepared at 60.ºC using 100. grams of water. As this solution is cooled to 10.ºC, NaNO3 precipitates (settles) out of the solution. The resulting solution is saturated. Approximately how many grams of NaNO₃ settled out of the original solution?

• 46 g

• 61 g

• 85 g

• 126 g

The bonds in BaO are best described as

• covalent, because valence electrons are shared

• covalent, because electrons are transferred

• ionic, because valence electrons are shared

• ionic because electrons are transferred