Test Yourself Answers and Quizlet Link

Page 81

1. A
2. C
3. B
4. D
5. B
6.  Anything that has mass and takes up space.
7.  Describe a pure substance's ability to change into different substances.  This includes flammability, ability to react with oxygen to form rust, and ability to react with an acid to corrode.
8.  Cannot be broken down into any other substances by chemical or physical means.
9.  Matter is not created or destroyed in any chemical or physical change.

Page 83

1. B
2. C
3. A
4. A
5. D
6. A
7. C

8.  In a physical change, such as melting or freezing, water remains the same substance: the compound H2O.  In a chemical change, such as using electricity to split H2O in H2 and O2 gases, a reaction produces products with different properties than the compound H2O - gases that are acidic and basic.




ALSO - Check out these flash cards at Quizlet:

Click HERE to go to the flashcards.  My only correction - a compound is NOT a mixture.

Homework 10/7

Sorry but Blogger will not let me add anything under the "Homework" heading.

Homework for 10/7 :  Finish Chapter 2 Notes
                                    Test this Thursday 10/10  Study Session at 8:15 AM

       Chapter 2 Test Study Guide

Properties of Matter

To study for this test please use your notes on the Properties of Matter and Exothermic/Endothermic Reactions vs. Changes.  Also use labs on Physical Properties, Chemical Properties, Chemical Changes, Endothermic and Exothermic reactions, and the Electrolysis lab.  Use homework assignments and the graphic organizer on physical and chemical changes and your textbook pages 58 – 77 as well.

Vocabulary to Know:

Energy   Matter    Properties of Matter     Physical Properties

Chemical Properties    Element     Atom      Molecule    Compound   

Mixture      Homogeneous Mixture     Heterogeneous Mixture

Solution      Physical Change        Chemical Change     

Law Of Conservation of Matter        Thermal Energy 

Temperature       Endothermic Reaction      Exothermic Reaction

Chemical Energy           

Indicators of a Chemical Change         Precipitate

Concepts to Know:

1. Everything is either energy or matter.

2. Properties of matter are characteristics of a substance that help to identify that substance.  Physical properties are characteristics that can be observed and measured without breaking bonds or changing the substance chemically.   

Examples:  Color, shape, density, boiling point

Chemical properties can only be observed when a substance is changes chemically.

Examples: Reactivity with other chemicals, flammability

3. An element is a pure substance that cannot be broken down into any other substance.  There are 92 naturally occurring elements in the universe.  Elements are organized on the Periodic Table of the Elements.  

4. Atoms are the smallest particle of an element.

5. Molecule – Two or more atoms chemically bonded.  Examples:  NaCl, CaCl2, O2, H2O, H2

6. Compound – Two or more DIFFERENT types of atoms chemically bonded.  Example:  All of the examples for molecules BUT H2.  H2 is only made of one thing, Hydrogen.

7. A mixture is two or more things combined together that have not been chemically bonded.  Solutions are a type of mixture where one thing dissolves into another. Examples: trail mix, salt water

8. Heterogeneous Mixture – You can see the parts of the mixture

9. Homogeneous Mixture – You can’t see the parts of the mixture.

10. A physical change is a change in a substance that does not alter a substance chemically.  It’s still the same substance.

11. A chemical change is a change where bonds are broken and new substances are formed.  Example: Burning wood, reacting Sulfuric Acid and Sugar.

12. Law of Conservation of Matter says that whatever matter goes into a chemical reaction has to come out.

13. Thermal Energy is the measure of the amount of movement of molecules in a substance.  The more movement, the more thermal energy, the higher the temperature.  Temperature is a measure of the thermal energy of an object.  We measure thermal energy (temperature) with a thermometer.

14. Chemical Energy is energy stored in chemical bonds.

15. Know the indicators of a chemical change and that a precipitate is a solid formed from a chemical reaction between two or more substances.

Study Guide Chapter 1 Test - Scientific Inquiry, Density, Buoyancy, Measurement

I.               Scientific Inquiry and Data

A.    Hypothesis – what is it?

B.     What are variables in an experiment?

C.    What is a manipulated/independent variable?

D.    What is a controlled experiment?

E.     Why is it important that an experiment be controlled?

F.     What is the responding variable in an experiment?

G.   What are Qualitative and Quantitative Data?

H.    Why is data important when writing conclusions?

II.              Measurement

A.    Metric Unit of Length is a meter

B.     Weight is a measure of force (your weight is a force on the Earth).  The units are pounds and Newtons.

C.    Weight is determined by mass and gravity.

D.    Mass is the amount of matter in an object.  Mass is measured in grams on a balance.

E.     Volume is the amount of space something takes up.

F.     Volume of a regular object (length x width x height) cm³

G.   Volume of an irregular object (water displacement) milliliters

H.    Read a graduated cylinder at the bottom of the meniscus (curvature)

III.            Density and Buoyancy

A.    Density is the amount of mass in a given space.

B.     Density = mass ÷ volume

C.    Units are g/ml  or  g/cm³

D.    Lots of stuff in a space means high density

E.     Density is a physical property.  It doesn’t matter how much of a substance you have, density stays the same.

F.     When you layer liquids and objects.  The denser objects go to the bottom.

G.   The density of water is 1.0 g/ml.  Anything denser than 1 g/ml will sink.  Anything less dense will float.

H.    Buoyancy is the ability to float.  All fluids exert an UPWARD force called a buoyant force.

I.       Buoyant force acts opposite to gravity and weight.

J.     Archimedes’ Principle:  Buoyant force acting on an object is equal to the weight of the object if the object floats.  If an object floats, it is displacing its weight in water.

8th Grade Science Supplies for the 2013-2014 School Year

Required Materials

1. Sharpened pencils (please have more than one)

2. Dedicated science notebook (either a spiral or a composition book).  Bring this to class everyday.

3. Separate Section of Binder for handouts, corrected homework, and labs.  This must be with you in class everyday.

4. Red pen

5. Notebook paper

6. Organizer

Qualitative vs. Quantitative Data Video

This is the shortest and clearest youtube video on Qualitative vs. Quantitative Data.

Mousetrap Car - Attaching string

Click HERE to see how to attach the string.