by STAO ADMIN | Nov 12, 2019
In this activity, students mix a given quantity of salt with a fixed volume of water. Mass and volume measurements are made before and after mixing to determine if these quantities change. Students observe that mass is conserved during dissolving while volume is...
by STAO ADMIN | Nov 12, 2019
Burning fossil fuels releases carbon dioxide, CO2(g), which contributes to the greenhouse effect and hence to climate change. Burning some fossil fuels also releases nitrogen oxides and sulfur dioxides. These gases react with moisture in the air to produce acid...
by STAO ADMIN | Nov 12, 2019
We are most accustomed to making observations directly with our eyes. Students therefore often find it conceptually challenging to comprehend the reasoning and logic used by scientists studying atoms that they cannot directly see. This activity allows the students to...
by STAO ADMIN | Nov 12, 2019
In this activity, student mix a given quantity of salt with a fixed volume of water. Mass and volume measurements are made before and after mixing to determine if these quantities change. Students observe that mass is conserved during dissolving while volume is...
by STAO ADMIN | Nov 12, 2019
Prior to Thomson’s work it was thought that the atoms of each element were unique, invisible particles, or that atoms were made of subatomic particles that had significant mass compared to the atom as a whole. Thomson used Crookes tubes to disprove both of these ideas...
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