A large bar of solid gold is melted into liquid. The liquid is then poured into molds to make a number of gold coins. Was this a chemical or physical change? Explain.

A stick of butter is melted in a saucepan. As it continues to cook, the butter turns brown. What changes have occurred?

Classify each as a physical change or a chemical change. burning wood

At a glassware factory, molten cobalt glass is poured into molds to make paperweights. Each mold is a rectangular prism whose height is 3 inches greater than the length of each side of the square base. A machine pours 20 cubic inches of liquid glass into each mold. What are the dimensions of the mold?

In much of the world, SI units are used in everyday life and not just in science. Why would it make sense for people in the United States to use SI units in everyday life, too? Explain using math terms such as calculate and convert.

Classify each mixture as heterogeneous or homogeneous. 14-K gold