What four properties are used to classify stars?

How are elements identified in terms of their atoms

Suppose two chemicals are reacted together. It takes 1000 kJ of energy to break the bonds of the reactants and 850 kJ of energy are released by the formation of the products. Which statement is true about the reaction? A. The reaction is exothermic.

What mass of benzoic acid would you dissolve in 350.0 mL of water to produce a solution with a pH = 2.85?

Write the symbol for every chemical element that has atomic number greater than 7 and atomic mass less than 24.0 u.

In a solution the substance that does the dissolving is called blank?

Which of the following transfers carbon from the nonliving environment to the living environment? Photosynthesis Cellular respiration Burning Decomposing

Which term describes this reaction? CH3Br (aq) + OH - (aq) - > CH3OH (aq) + Br - (aq) a. addition b. condensation c. elimination d. substitution

The elements of which group are nonreactive? halogens alkaline earth metals noble gasses alkali metals

Which best describes the definition of Lewis acids and bases? a general definition based on electron structure a general definition based on hydrogen ion concentration a specific definition based on a compound's ability to accept protons a specific

Question 22 Which change would cause the volume of a balloon to increase? A increasing the temperature of the balloon B increasing the atmospheric pressure C removing gas from the balloon D placing the balloon under water