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The surface area of the Caspian Sea is approximately 1.4 × 105 square miles. Given that there are 1.609 km in one mile, calculate the surface area of the Caspian Sea in square meters and round the answer to the correct number of significant figures.

A 15 g sample of propane combusts in the presence of oxygen to produce 45 g of carbon dioxide and 24.5 g of water vapor. Select the mass of oxygen that reacted with the propane.

An unknown metal object with a mass of 12.346g was placed in a graduated cylinder that initially contained 25.0 mL of water. After the object was submerged in the water, the volume of  the water and the object was measured to be 26.7mL. Calculate the density of the object and use the following table to determine the identity of the object.  Metal  Density (g/mL)  Copper 8.96   Aluminum 2.70   Zinc 7.13   Tin 7.26 

Select the correct sequence of events in the scientific method.

Sodium and oxygen can react to form sodium oxide, Na2O. Predict the chemical formula of the product of the reaction between lithium and sulfur.

Which are considered pure substances?

Select the chemical property.

Select the choice that is not an example of energy.

Select a conclusion that Ernest Rutherford made from his various experiments.

Elemental chlorine, Cl2, is a gas that has corrosive chemical properties. Select an element that is likely to have similar chemical properties.