Questions by David Bella

Questions by David Bella

Hydrogen gas can be prepared by reacting metallic sodium with water: 2Na(s) + 2H2O(l) → H2(g) + 2NaOH(aq). If the price of sodium were 165/kg, what would be the cost of producing 1.00 mol of hydrogen.

asked Sep 6, 2020

2 answers

3 votes

31.3k views

Mechanical energy is conserved in the presence of which of the following types of forces?Select all that apply. A- electrostatic B- frictional C- magnetic D- gravitational

asked Jun 25, 2020

2 answers

3 votes

152k views

an earthworm tunnels 2 centimeters into the ground each day the earthworm tunnels at about the same pace everyday how many days will it take the earthworm to tunnel 14 century

asked Apr 25, 2020

2 answers

3 votes

69.3k views

To push a 21 kg crate up a frictionless incline, angled at 40° to the horizontal, a worker exerts a force of 224.9 N, parallel to the incline. As the crate slides 1.50 m, how much work is done on the crate

asked Mar 12, 2020

1 answer

3 votes

133k views

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