What is the ability to do work or cause change is called ?

1. Energy 2. Potential Energy and Kinetic Energy

Explanation: Energy is the capacity of a physical system to do work. Energy for stationary objects is called as Potential energy and energy in motion is known as Kinetic energy.

1. Energy

2i. Potential energy

2ii. Kinetic energy

Explanation:

Energy is simply the ability to do work.

Mechanical energy exist in two forms

1. Potential energy: this is the energy possed by a body at rest. It is otherwise known as stored energy.

2. Kinetic energy: this is the energy possed by a body in motion. A body changing position possess kinetic energy.

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

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