1. which of the following statements expresses a physical science definition of energy? a. the ability to do work b. the ability to move from one place to another c. the readiness to be very active d. the rate at which work is done 2.in which of the following is work being done? (multiple answers) a. a traveler lifts a suitcase from the floor up to the baggage cart. b. an elevator carries people from the ground floor to the fifth floor. c. a woman tries hard to lift a barbell, but the barbell doesn’t move. d. a child drags her large teddy bear across the floor. e. a rocket ship rests on the moon.

A. the ability to do work hope this helps

car a and b are moving in opposite directions

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  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂