Chemistry

10. Which types of bonds tend to have the highest bond energy? 11. Which types of bonds tend to have the lowest bond energy?

4 7 Add an answer item! Add an answer item! Answer Bank carbon iodine

10. What is the mole ratio of $MgCl_{2}$ to HCI $\underline {\quad }:\underline {\quad }$

Which action effectively increases the reactant concentration and increases the reaction rate? decreasing pressure heating the reactant mixture increasing pressure cooling the reactant mixture

Matter can undergo physical or chemical changes. Which of these are examples of chemical changes? Select TWO correct answers. A. Freezing water B. Milk souring C. Iron melting D. Dry ice sublimating E. Cooking an egg

What is the most common substance found in ecstasy? rat poison tar glass nicotine

Which action would speed up the reaction for the chemical reaction $CH_{3}Br+OH^{-}\rightarrow CH_{3}OH+Br^{-}$ increasing the $CH3Br$ concentration reducing the $OH-$ concentration cooling the reactant mixture reducing the pressure of the reactant mixture

Which action decreases the activation energy of a reaction? decreasing the temperature removing reactant molecules removing a catalyst adding a catalyst

Convert 89000 g $Pb(NO_{3})_{2}$ to atoms

Given the following reactions and corresponding $\Delta H$ values, find the $\Delta H$ (to the nearest whole \#) for the reaction: $H_{2}SO_{4}(l)\rightarrow SO_{3}(g)+H_{2}O(g)$ $H_{2}S(g)+2O_{2}(g)\rightarrow H_{2}SO_{4}(l)$ $\Delta H=-235kJ$ $H_{2}S(g)+2O_{2}(g)\rightarrow SO_{3}(g)+H_{2}O(l)$ $\Delta H=-207kJ$ $H_{2}O(l)\rightarrow H_{2}O(g)$ $\Delta H=44kJ$ $\square $