Question 20

an allotrope of carbon that is hard and is often used in jewelry is

a)diamond

b)graphite

c)quartz

d)silicon

Answer:    A)diamond

An allotrope of carbon that is mostly used in jewellery is diamond.

Explanation:

Allotropes of an element are the different physical forms in which the element can exist. These allotropes will have surprisingly different physical properties. Carbon has various allotropes like diamond, graphite and fullerene.

They differ in their physical appearance as well as physical properties. Accordingly they have differing uses.  Graphite is electrically conducting  while diamond  is a poor electrical conductor. Just like carbon many elements have varying number of allotropes.

electronic measurement tools display data on a screen after waiting for several minutes.

while some business owners prefer manual record keeping systems, most businesses use an electronic record keeping system - making it easier to capture information, generate reports and meet tax and legal reporting requirements.

explanation: