Which answer choices best indicate that a substance has experienced a chemical change?

What do the dots around a symbol in a Lewis structure represent? a. bonding electrons b. valence electrons c. s orbital electrons d. shared electrons

Which of the following has primary responsibility for eliminating alcohol from the bloodstream

If an object has two forces acting on it how can the next force equal 0

Which group 1 element reacts the most vigorously? Rb Cs K Li Na

How do intra-specific and inter-specific relationships within a community maintain biodiversity by preventing competitive exclusion?

A sample of argon gas is at a pressure of 1.725x10^4 kPa and a temperature of 24°C in a rigid 20 L tank. How many moles of argon does this tank contain? (show your work)

summarize what you read on the two articles by identifying the advantages and disadvantages of using plastics

What happens chemically when quick lime is added to water?

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.