The principle of conversion of mass is true

a. only for reactions that take place in open systems

b. only for reactions that take place in closed systems

c. for reactions in both open and closed systems

Where are the electrons located on a periodic table?

Which scenario represents a scientific investigation A. A measurement of growth patterns of crystals in space B. A selection of favorite songs in a survey C. A questionnaire on the quality of care in a hospital D.

How many neutrons are in an atom of tin? Round your answer to the nearest whole number.

0.408 grams to moles

earth and its ecosystem are in a constant state of change. explain how a catastrophic environmental change, such as a wildfire in california, affects the local ecosystem. how does the ecosystem respond in this case

Two components combine to create a binary ionic compound. Name one of them

True or false. The synthesis of giant molecules from components of repeating units is polymerization.

Which term names an environmental cost of fossil fuel consumption? A. cheap energy B. increased greenhouse gases C. renewable resource D. low pollution

Slowly heating butter in a pan until it changes from a solid to a liquid is an example of a physical change. True False

Action - reaction forces don't cancel each other. A. True B. False