5 Written Questions

1. a neutral group of atoms joined by covalent bonds.
2. ionic compound that can be made from neutralization reactions; made from the positive ion of a base and the negative ion of an acid; salts share the same properties of ionic compounds, including crystal shape, high melting points, and high boiling points, and electric conductivity.
3. a compound that is made up of molecules held together by shared electrons, covalentlybonded; usally do not conduct electric current when melted or dissolved in water and usally have lower melting points and boiling points.
4. new substances that form as a result of a chemical change.
5. energy is absorbed from nearby matter which can cause thesurroundings to become cooler. examples: baking soda and vineager combined reaction absorbs energy so it feels cool. frying eggs requires constantaly adding heat.

5 Multiple Choice Questions

1. separate as a fine suspension of solid particles
   1. reactant
   2. indicator
   3. precipitate
   4. product
2. a compound that changes color when it comes in contact with an acid.
   1. indicator
   2. base
   3. luster
   4. product
3. substances that undergo the chemical changes are called
   1. reactant
   2. acid
   3. salt
   4. luster
4. tastes bitter, feels slippery, and turns red litmus paper blue.
   1. acid
   2. luster
   3. base
   4. salt
5. the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
   1. law of conservation of mass
   2. exothermic reaction
   3. molecular compound
   4. neutralization

5 True/False Questions

1. exothermic reaction → energy is released, usally as heat; examples reaction between oxygen and fuels that produce fire.

   True        False

2. ionic compound → made of positive and negative ions,(oppositely charged ions) but the overall charge is zero; forms hard crystals with high melting points, and conduct electric current when dissolved in water or melted.

   True        False

3. acid → ionic compound that can be made from neutralization reactions; made from the positive ion of a base and the negative ion of an acid; salts share the same properties of ionic compounds, including crystal shape, high melting points, and high boiling points, and electric conductivity.

   True        False

4. luster → the way a mineral reflects light from its surface.

   True        False

5. neutralization → a compound that changes color when it comes in contact with an acid.

   True        False