In determining the percentage purity of an impure NaCo3 for 4.2g of the impure was place in measuring cylinder to work up to 1000cm . the resultant solution is neutralize by 0.092m of 20.40cm3 Hcl in lab [ na=23,o= 16, c=12, h=1, cl=35-5] hint: percentage purity =mass pure substance ×100
mass concentrate : impure substance??

muscle endurance

explanation:

i can do 50 in a row ( but i get so tired after that)

b.a device that inputs heat into a cool object

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

mass and volume are the answers you are looking for