1. Classify each of the following samples of matter. Put an “X” in the box that applies. If it is a Pure Substance, classify it as an element or a
compound. If it is a Mixture, classify it as Heterogenous or
Homogenous.

Gold
Pepperoni pizza
Carbon dioxide
Grade juice
Helium
Salt
Sand at the beach
Ocean water

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth

What causes most sediment to wash or fall into a river