Determine the empirical formula of an organic hydrocarbon compound that contains 80% by mass of carbon and 20% by mass of hydrogen. If the Mr of the compound is 30, what is the molecular formula?

What does the pH of a solution measure? O A. Color O B. Volume O c. Temperature O D. Acidity

This is the energy that all moving objects have. 1. Mechanical Energy 2. Electrical Energy 3. Light Energy 4. Thermal Energy 5. Sound Energy 6. Kinetic Energy 7. Potential Energy

Cellulose could provide an abundant and cheap form of glucose for humans. Why is cellulose not a source of nutrients for humans? Cellulose digestion must occur in a basic environment, but the human gut is acidic.

A chemistry lab needs to make 100 gallons of an 18% acid solution by mixing a 12% acid solution with a 20% solution. find the number of gallons needed of each solution.

The burning of gasoline to power internal combustion engines produces water vapor, and carbon dioxide gas that is thought to contribute to the "Greenhouse Effect" in the earth's atmosphere.

What was the crop that led to the success of Jamestown? A) cotton B) sugar cane C) tobacco D) indigo

The currents of the Earth's oceans are caused by A. marine organisms and volcanic eruptions. B. disturbances by submarines and large ships. C. waves and earthquakes along tectonic plate boundaries. D.

You are on an alien planet where the names for substances and the units of measures are very unfamiliar. Nonetheless, you obtain 19 quibs of substance called skvarnick.

How do you know if an element is an ion?

Which gas is not a greenhouse gas, A methane, B Water Vapor, C, Carbon dioxide, D, Nitrogen, E, Ozone