The half-life of a radioisotope is the amount of time it takes for a. half the sample to decay. b. all the sample to decay. c. the age of an artifact to be calculated. d. detectable radiation to be absorbed by a sample.

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

What is the independent variable in this investigation? mass volume sample number substance density

The identities of substances are the same before and after which type of change