Andy is trying to see which objects conduct electricity by placing them in a gap in an electric circuit. A light bulb is in the circuit. When it lights up, Andy knows the current is flowing. He records his data in the table below.
Select the name of each electrical insulator.
Material Conductivity Test
Object
Light Bulb Lit Up
paper clip
yes
rubber band
no
nail
yes
glass rod
no

The modern periodic table has groups.

What are fructose and glucose an example of?

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)