Science Exam Study Guide:6th Grade Name: ______

Period: ______Date: ______

Directions: Fill in the blank with the correct answer

  1. The density of a substance is the amount mass in a given volume. When the mass increases the density will increase. The Formula for density is D=m/v
  2. An inference is a conclusion based on the data collected.
  3. When collecting data, a variation in the different measurements is likely due to human error, wrong instrument or lack of precision in the instrument used.
  4. Scientists share their findings because it allows others a chance to review one another’s work.
  5. When conducting a science experiment and the water forms bubbles, it is safe to say that the temperature of the water is ______100∘C_ because that is its _____boiling point______
  6. In an exothermic reaction, the temperature of the products after the reaction is higher or has increased because it has releasedenergy in the form of heat, light, or sound.
  7. In a reaction, if the material is chopped into tiny pieces, the chemical reaction would be faster.
  8. In an experiment to test the change of temperatureand how it affects the solubility of sugar, the independent variable would be the temperature because it’s the variable that is changing.
  9. The average atomic mass is the average mass of the element’s ___isotopes______Carbon’s average atomic mass is ___12.01____
  10. Chopping vegetables is an example of ______a physical______change.
  11. Description describes a (n)observation of the properties of a substance. Whereas an explanation attempts to provide a reasonwhy something happens.
  12. The melting point of a substance where a substances is changing from a solid to a liquid is the same as its freezing point, where the substance becomes a solid.
  13. In a chemical reaction, the mass of thereactants is the same as the mass of the products.
  14. When the particles of a substance cool down, they usually slow down.
  15. When floating in a pool, holding your breath makes it _easier to float because the person becomes less dense.
  16. The amount of water displaced is the same to the amount of the buoyant force.
  17. An ice cube is not melting when the temperature is ______at or below 0∘C______,itsmelting/freezing point.
  18. How are metalloids different from metals? They look like metals, but behave like nonmetals most of the time. They are brittle and only conduct electricity at high temperatures. The best known metalloid is silicon, used in computers and calculators.
  19. Define what is an ion? Ion is an atom that electrically charge because it was loss or gained electrons
  1. Compare and contrast J.J Thomson model to the modern atomic structure: JJ Thomson model was a positively charged sphere with electrons attached and scattered around it.Modern model has a nucleus with an electron cloud around it.
  2. What kind of chemical reaction is wood burning? ______Exothermic___
  3. Describe the connection between elements and atoms _____Elements are made of atoms; atoms of the same element have the same number of protons; atoms of the same element can differ in the number of neutrons they contain; the properties of elements are determined by the structure of their atoms.
  4. A cold pack is a (n) ______endothermic______chemical reaction.
  5. Write the average atomic mass of the following elements

Nitrogen ____14.01______

Helium ______4.00______

Neon ______20.18______

Oxygen ______16.00______

  1. How does a larger surface area affect the rate of the reaction? When the surface area increases the rate or speed of the reaction also increases.
  2. Name the negatively charged particle of an atom? ______electrons_
  3. How does the periodic table organize the elements? __by its atomic numbers______
  4. What do you call the type of reaction that gives off energy? ______exothermic_____
  5. What are the small particles found in the nucleus? ______protons and neutrons
  6. Name the group of elements that are poor conductors? ___non-metals
  7. What are most of the elements in the periodic table? Most of the elements are metals (75%)
  8. What are isotopes? ____The element’s substances that have different number of neutrons, but the same number of protons
  9. Name examples of isotopes of carbon: Carbon12; Carbon 13; and Carbon14.
  10. Give examples of metalloids? Silicon____
  11. What type of bond do carbon and oxygen form? _____Covalent because it’s two gases______
  12. Give examples of compounds ______any substance that is made of two or more elements, such as carbon dioxide, rust, water______
  13. What does the atomic number indicates in all elements? It indicates the number of protons in a given substance.
  14. What are inorganic compounds? __Simple substances that include carbon dioxide but are not the building blocks of life.
  15. What do you call a reaction that releases energy? ____exothermic reaction____
  16. What do catalyst do in a reaction? ____Catalysts speed up the reaction______