What is enthalpy? A. Enthalpy is the mass involved in a reaction. B. Enthalpy is the heat involved in a reaction. C. Enthalpy is the temperature of a reaction. D. Enthalpy is the kinetic energy of a system.

Which of the species below is less basic than acetylide? $CH_{3}MgBr$ $CH_{3}ONa$ $CH_{3}Li$ both A and C all of the above

$CH_{3}-CH_{2}-OH$ Spell out the full name of the compound. $\square $

QUESTION 1 OF 10 When reading a chemical label, it's important to check for what two kinds of hazards? SELECT ALL THAT APPLY health safety storage transportation

3) (4 pts) Give the structures (condensed or line-angle structures) of the isomers of $C_{4}H_{10}$ and name each.

8. Explain the rules used to assign oxidation numbers. __ 9. Why do some elements have multiple oxidation states? __

Which of the following is a possible way to describe the $NO_{2}$ component in the reaction below? $N_{2}(g)+2O_{2}(g)\rightarrow 2NO_{2}(g)$ $1LNO_{2}$ 4 moles NO $NO_{2}$ 2 molecules of $NO_{2}$ 2 atoms $NO_{2}$

Question 1 (1 point) $\underline {\quad }H_{2}+\underline {\quad }Cl_{2}\rightarrow \underline {\quad }HCl$

Which amount of surfactant resulted in the greatest amount of airflow? 2 4 Amounts 2 and 4 gave the same airflow.

What classes can a pure substance be divided into? (Reference p 17 of your textbook.) A Elements and compounds B Electrons and protons C Elements and electrons D Neutrons and protons

When a sample contains a flammable or explosive compound , what special preventive measure may be necessary? Using a special chilled canister to collect the sample Electrically grounding the sample container to prevent a spark Wearing static-free clothing Using a nonmetallic sample container