4. In the lab activity Making Connections, an experiment was designed to test the effect of exercise on the ability to squeeze a clothespin. The number of times the clothespin was squeezed served as the
1. independent variable 2. dependent variable
3. hypothesis
4. control

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

Why doesn't heat added to water make the tempature rise above 100c

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?