On your own: For further practice, click New sample. In this set, the contents of every tube is randomized. You may even find new substances you haven’t seen before. Record your observations and make hypotheses about the contents of each tube. Good luck!

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.

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