Most people with depressive illnesses can get better with treatment.

A chemist has a block of copper metal (density is 8.96 g/mL). They drop the metal into a graduated cylinder containing water, and find the volume change is 1.70 mL. What is the mass of the block, in grams? (Just put the number and no units.)

Which two particles of the atom have nearly identical masses? 

What is the atomic symbol and mass number for an atom containing 50 protons and 64 neutrons? 

Which of the following quantities is equivalent to 594 mg? 

A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 6.90 mL. If the metal weighs 9.84 g, what is the density of the metal in g/mL? (Just put the number and no units.) 

The number 0.0509 has ___ significant figures.

The density of water is approximately 1 g/cm³. Which of these substances will sink in water? 

Which of the following states of matter is pictured below? 

Which one of the following is an example of an element?