Drag the tiles to the correct boxes to complete the pairs. match the symbols used in electric circuit diagrams to their functions. a device that converts electric energy into sound energy arrowright a device that glows when it receives current arrowright a device that provides energy to a circuit arrowright a device that starts or stops the flow of current arrowright

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.)

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

Write a balanced equation showing the formation of copper (ii) nitrite from its elements