Science- Chemistry

5 Written Questions

1. an element that conducts heat poorly
2. an atom that has a complete other level
3. the smallest unit of matter
4. a combination of two or more substances that are not chemical combined
5. a subatomic particle that has no charge

5 Matching Questions

1. element
2. molecule
3. group
4. compound
5. nucleus

1. a a substance made up of atoms of two or more different elements joined by chemical bonds
2. b a vertical row in the periodic table
3. c an atom's central region
4. d the smallest unit of a substance that keeps all physical and chemical properties
5. e a substance that cannot be broken down anymore

5 Multiple Choice Questions

1. the number of protons in the nucleus of an atom
   1. atomic mass
   2. atomic number
   3. molecule
   4. mixture
2. a bond that forms when an electrons are transfered from one atom to another, which results in a positive ion and a negative ion
   1. ionic bond
   2. neutron
   3. compound
   4. atomic mass
3. a horizontal row in the periodic table
   1. proton
   2. metals
   3. ion
   4. period
4. the mass of an atom expressed in atomic mass units
   1. atomic mass
   2. atomic number
   3. atom
   4. atomic mass unit
5. a subatomic particle that has a negative charge
   1. electron
   2. element
   3. proton
   4. neutron

5 True/False Questions

1. chemical change → when a substance changes into something with completely different properties

   True        False

2. covalent bond → a bond that forms when an electrons are transfered from one atom to another, which results in a positive ion and a negative ion

   True        False

3. proton → a subatomic particle that has a positive charge

   True        False

4. metals → an element that conducts heat poorly

   True        False

5. pure substance → a substance made of only one kind of element

   True        False