A student taking a tour of a company that makes copper pipes was able to observe a large piece of pure copper. After observing the piece of copper, the student could conclude that copper is─ A
composed only of copper atoms and can be represented by the symbol Cu.
B
composed only of copper atoms and can be represented by the symbol C.
C
composed only of copper and carbon atoms and can be represented by the symbols Cu and C.
D
composed only of copper and oxygen atoms and can be represented by the symbols C and O.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

a. carbon monoxide from car exhaust

b.particulate matter, such as soot

c.water vapor from a factory smokestack

d.acid rain

these are the answer choices im on that question right now