If a material, such as diamond, is very strong but gives way (ruptures) quickly when a crack forms, then it is considered ( don't answer unless you know.)
tough
elastic
brittle
ductile

The answer is brittle because it crumbles away even though it is tough.

c) Brittle

Answeropposite;

Using dilution equationm1v1 =m2v2 ; where m1 and m1 are the intiial and final concentration, and v1 and v2 are the initial and final volume.5  × 5 m = 8 l  × m2m2 = 25/8 = 3.125 mtherefore; the resulting molarity is 3.125 m