True or false If a material has a hardness of 8, it cannot be scratched by a material with a hardness of 7.

Dalton assumed that all atoms of the same element were identical in all their properties. Explain why this assumption is not valid.

There are more electrons than protons in a negatively charged atom. True False

If vinegar is added to baking soda, the reaction Cu (s) + 2Ag (NO3) (aq) à 2Ag (s) + Cu (NO3) 2 (aq) occurs. What evidence would indicate that the reaction is occurring? a. a precipitate is formed b. light and heat are given off c.

Chocolate Chip Cookie Recipe: 1 cup of flour 100 chocolate chips 1 cup sugar 1/2 cup milk Yields 10 cookies You and your sister want to bake chocolate chip cookies.

Determine the number of hydrogen atoms in 1.5 moles of water, h2o, molecules

The mass of one formula unit of SrCl2 is 158.52 amu. Based on this fact, what conclusion can you draw? A. A mole of SrCl2 particles has a mass of 158.52 g. B. 1 g of SrCl2 contains an average of 158.52 particles. C.

A blank is a special kind of mixture in which one substance is uniformly mixed into another

importance of pH value in daily life

How do metallic bonds differ from covalent and ionic bonds

Will ag2so4 precipitate when 100 ml of 5.0*10-2 m agno3 is mixed with 10 ml of 5.0*10-2mna2so4 solution?