Calculate ΔHrxnΔHrxn for the following reaction: CH4(g)+2Cl2(g)→CH2Cl2(g)+2HCl(g)CH4 (g)+2Cl2(g)→CH2Cl2(g)+2HCl(g) Use the following reactions and given ΔHΔH values. CH4(g)+Cl2(g)→CH3Cl(g)+HCl(g)CH4(g) +Cl2(g)→CH3Cl(g)+HCl(g), ΔH=−ΔH=−99.60 kJkJ CH3Cl(g)+Cl2(g)→CH2Cl2(g)+HCl(g)CH3 Cl(g)+Cl2(g)→CH2Cl2(g)+HCl(g), ΔH=−ΔH=−105.8 kJkJ Express your answer to four significant figures.

Write a hypothesis that answers the lesson question, “while observing a chemical reaction, how can you tell which reactant is limiting? ” hypothesis: if a substance is the limiting reactant, then . . because . .

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

Displacement is the slope of a velocity vs. time graph a. true b. false