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November 8

Adult Education Science

Fall 2010

Teacher Stacy Graham

 

Compounds and Mixtures

 

1        What are the three main types of matter?

  
  1. Matter is classified into the three groups based on what?
  
  1. A ______________ is made up of two or more different kinds of matter that are physically combined.
  
  1. A sample of matter is made up of three different atoms that are chemically combined.  What type of matter is this?  How do you know?
  
  1. A substance is made up of two atoms of oxygen.  Is it an element or a compound. Explain why.
  
  1. What is a compound?
 
  1. What are the properties of sodium, chlorine, sodium chloride?
 
  1. How can compounds be broken down into the elements that make it up?
 
  1. When an unknown solid is heated, two different gases and a liquid are formed.  Is the solid a compound or an element?  How do you know?
 
  1. How is a molecule different from an element?
 
  1. A _______________ is the force of attraction that holds atoms together.
 
  1. Why do different kinds of matter in a mixture keep their own properties?
 
  1. The substances in a mixture always keep their own________________.
 
  1. The substances in a mixture can be ___________ by using the physical properties of the substances.
 
  1. Will freezing a mixture of salt and water separate the two substances.  Explain.
 
  1. A teaspoon of instant coffee is placed in a cup of boiling water.  Is this a mixture or a compound?  Explain
 
  1. How are mixtures and compounds different?
 
  1. When certain poisonous gas is combined with a chemically active metal, a fine white powdery substance results.  The new substance is neither poisonous nor chemically active.  Is the powder a mixture or a compound?  How do you know.
 
  1. Water is a compound.  Salt  water is a mixture.  List the differences between water and salt water.
 
  1. What are valence electrons?
 
  1. Why are atoms neutral?
 
  1. Does a negative ion have more protons or more electrons?
 
  1. How does an ionic bond form?
 
  1. What is a crystal?
 
  1. Electrons have a _________________ electrical charge.
 
  1. When an atom looses electrons, it becomes a ____________ ion.
 
  1. An ___________ forms when one atom takes an electron from another atom.
 
  1. A ______________ is a solid that contains atoms arranged in a regular pattern.
 
  1. How can atoms complete their outermost energy levels?
 
  1. Is water an ionic compound or a covalent compound?
  2. What do electron dot diagrams show?
  3. In a covalent compound, the atoms joint together to form a ____________.
  4. In most atoms, the ____________ energy level is not completely filled.
  5. In a covalent bond, electrons are _____________.
  6. What is a structural formula?
  7. In a __________ bond, two pairs of electrons are shared between atoms.

    Adult Education Science

    Fall 2010

    Teacher Stacy Graham

      

    Solutions

     
    1. What is a solution?
    2. What are the different types of solutions?
    3. What is the difference between a solute and a solvent?
    4. How can a substance be both soluble and insoluble?
    5. Why is a water molecule called a polar molecule?
    6. What happens to sugar molecules when sugar is placed in water?
    7. What will happen if the force of attraction holding solute particles together is greater than the force of attraction between solute and solvent?
    8. How are molecular solutions similar to ionic solutions?  How are they different?
    9. What is the relationship between the temperature of a liquid solvent and the rate at which a solid dissolves in it?
    10. Why do you think more gas can dissolve when pressure is increased?
    11. What type of compounds will water dissolve?
    12. What is the difference between a dilute solution and a concentrated solution?
    13. If you were preparing a solution, how could you tell when it became saturated?
    14. What happens to a solution that enables it to hold more solute than it normally would?
    15. Is a can of frozen juice a concentrated or a dilute solution?  Explain.
    16. What will happen to the freezing point of water as you add solute to the water?
    17. What is boiling point elevation?
    18. What two important functions does an engine coolant have?
    19. What two processes are involved in distillation?
    20.  
  8. An atom of hydrogen contains one electron in its one energy level.  Could a hydrogen atom form a triple bond with another atom?
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