Which is true about a chemical reaction
A. a substance always changes in color, shape, and/or size

B. a substance always changes temperature

C. a substance only undergoes a physical change

D. a new substance with different chemical properties formed

According to the tide table below what time of day will the highest tide occur?

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

Give a real-world example of an energy transformation that uses two of the following forms of energy: chemical, mechanical, nuclear, gravitational, radiant, electrical, thermal (heat), and/or sound.