Identify each of the following as a physical or chemical property: Gold is a good conductor of electricity.

What type of change, physical or chemical, takes place in each of the following? Food is digested.

Identify each of the following as a physical or chemical property: Gold melts at 1064 $\degree$ C.

What type of change, physical or chemical, takes place in each of the following? Water vapor condenses to form rain.

Classify each of the following as a homogeneous mixture or heterogeneous mixture: (3.1) a. lemon-flavored water b. stuffed mushrooms c. eye drops

Classify the following as an element, compound, or mixture.

Saltwater

Classify each of the following mixtures as homogeneous or heterogeneous: blue ink

Classify each of the following mixtures as homogeneous or heterogeneous: mustard

Classify each of the following as a homogeneous or heterogeneous mixture: lemon-flavored water

Classify each of the following as a pure substance or a mixture: baking soda ($NaHCO_3$)

The reaction of oxygen and hydrogen is used to propel rockets. Liquid oxygen has a boiling point of $-222.7^{\circ} \mathrm{C}$. What is this temperature in degrees Fahrenheit? Density

Explain how biological weathering can incorporate both physical and chemical weathering: __________.

Classify each of the following mixtures as homogeneous or heterogeneous: peanut butter sandwich

Why is it important to periodically take a physical inventory if the perpetual system is used?