Explain why a high-mass star has a much shorter lifespan than a low-mass star despite the fact that a high-mass star has much more hydrogen (fuel) to burn. Don't forget that an explanation
needs to answer how and whí, something happens. Be sure to include the following in your
explanation:
a. How gravity leads to nuclear fusion
b. How the rate of fusion in a high mass star compares to the rate of fusion in a low mass
star
c. Why a high-mass star has a much shorter lifespan than a low-mass star despite the fact
that a high-mass star has much more hydrogen (fuel) to burn

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

How many moles of sulfuric acid (h2so4) are needed to react completely with 6.8 moles of lithium hydroxide (lioh)? 2lioh + h2so4 → li2so4 + 2h2o a. 3.4 mol h2so4b. 6.8 mol h2so4 c. 10.2 mol h2so4 d. 13.6 mol h2so4