Which process is a chemical change?

1. freezing of liquid water to solid ice

2. condensation of gaseous steam to liquid water

3. boiling of liquid water to gaseous steam

4. decomposing of water to hydrogen gas and oxygen gas

When a solution of ethanol (C2H5OH) is formed in water, the ethanol molecules 1. form hydrogen bonds to the polar water molecules. 2. form covalent bonds to the polar water molecules. 3. are attracted to the nonpolar water molecules. 4.

Wish cannot be separated into simpler substances

You have three molecules of glucose (3C^6H^12O^6). How many carbon atoms do you have?

Using your senses to gather information is called

Compare and contrast cytokines in animal and plant cells

Which statement describes the redox reaction that occurs when an object is electroplated? A. It is spontaneous and requires an electric current. B. It is spontaneous and produces an electric current. C.

How are electromagnetic different than all other waves

Find the ratio of speeds of an electron and a negative hydrogen ion (one having an extra electron) accelerated through the same voltage, assuming non-relativistic final speeds. Take the mass of the hydrogen ion to be 1.67*10^{-27} kg.

A type of rock that undergoes changes because of heat and pressure

How many milliliters of a 1.25 molar HCL solution would be needed to react completely with 60 g of calcium metal Ca+2HCl - - > CaCl2 + H2