Final exam

In which phase are particles generally the closet?

• Solid

• gas

• liquid

• plasma

Which is the most common property of all liquids

• Liquids have a definite volume

• Liquids have a definite shape

• Liquids conduct electricity

• Liquids are transparent

Which process represents a chemical change

• melting of ice

• burning of paper

• evaporation of water

• crystallization of sugar

Which of the following in true about charges assigned to an electron and proton

• Both an electron and proton are positive

• An electron is positive and proton are negative

• an electron is negative and protons are positive

• Both protons and electrons are negative

An atom is carbon-12 an atom of carbon-14 differ in

• atomic number

• mass number

• nuclear charge

• number of electrons

Because carbon can not be decomposed by simple chemicals methods into two or more different substance, it is classified as

• an element

• A mixture

• A Compound

• A molecule

Which of the following is an example of a homogenous mixture

• Salt water

• Rocks and and at a beach

• iron filing and sulfur powder mixture together

• a drop of pure water

A small quantity of a salt is stirred into a liter of water until it dissolves. In the resulting mixture, the salt is

• a colloid

• the solvent

• the tincture

• the solute

Which is the formula for the compound that forms when magnesium bonds with phosphorus

• Mg2P

• Mg2P3

• MgP2

• Mg3P2

The solubility of most solids in water can be increased by

• increasing the amount of solvent

• increasing the temp of the solvent

• stirring rapidly while dissolving the solid

• grinding the solid to a fine powder before dissolving