Students investigated the reaction between a strip of zinc and excess hydrochloric acid. They monitored the volume of hydrogen produced every 15 seconds.
The conical flask was placed in a water bath at 20°C.
The students plotted a graph of their mean results.
The students tested the gas produced during the reaction
Describe the test for hydrogen gas.

This line graph compares the growth of plants that were kept in the sun for different amounts of time.a)  on day 7, the plants kept in the sun for 3 hours were how tall? b)  on day 7, the plants kept in the sun for 6 hours were how tall? c)    on day 10, the plants kept in the sun for 9 hours were how tall? d)  on day 11, the plant that was grown with 1 hour of sunlight was how tall? e)  based on the graph, the plant grows best in what amount of sunlight?

Why are the trends and exceptions to the trends in ionization energy observed?

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.