What happens during a physical change? A. New substances are found B. the identity of the substance is changed C. A chemical reaction occurs D. A substance may look different but not lose its identity

If the following elements were to form ions, they would attain the same number of electrons as which noble gas? elements: As, S, Na, Rb noble gas: He, Ne, Ar, Kr

When the equation Fe+S - -> Fe2S3 is balanced, what is the coefficient for sulfur?

Look at the reaction below. HBr + KOH KBr + H2O. Which substance is the base in the reaction? A. Hbr B. KOH C. KBr D. H2O

Are dispersion and dilution the same process

How do you find the mass of an element in a compound? ex. how much sodium is produced from 129.6g NaN3?

What type of reaction is sodium reacting with chlorine

1. If temperature is increased, the number of collisions per second

1. Tonic Bonds are a. Formed when a metal and nonmetal transfer electrons b. Formed when a nonmetal and nonmetal share electrons Formed when a metal forms || bonds with other like atoms d. Formed when noble gases lose electrons

Why does the sun appear to be the brightest star in the sky? A - Its apparent brightness is much greater than other stars. B - It burns more gas, making it brighter than any other star.

What effect does nuclear radiation have on atoms? It splits atoms. It burns atoms. It ionizes atoms.