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NAME ______________________________________________________ BLOCK ___________________________ 8th Grade Science – Ms. Ball EOG Review Homework - Week 34 Assigned: Tuesday, May 12, 2015 Due: Friday, May 15, 2015 TUESDAY: Atoms, Elements, Compounds, & Mixtures (worth 33 percent) True or False: Identify if the following statements are true or false. 1. __________________: Atoms are smallest form of matter. 2. __________________: Electrons are located in the nucleus of an atom. 3. __________________: When two or more elements combine chemically you get a mixture. 4. __________________: The properties of elements do not change when mixtures are formed. 5. __________________: Particles in a solid are not packed at all. 6. __________________: Solids keep their shape. 7. __________________: Liquids have a definite volume and take the shape of their container. Multiple Choice: Select the correct answer then explain HOW you knew that answer was CORRECT. 8. What makes an atom’s charge electrically neutral? a. subatomic particles have no charge b. atoms contain only neutrons, which have no charge c. the number of negative electrons equals the number of positive protons d. atoms are not neutral How do you know? ______________________________________________________________________ 9. Which pure substance is composed of only one element? a. Water b. Oxygen c. Salt d. Carbon Dioxide How do you know? ______________________________________________________________________ 10. Which of the following is correctly arranged in going from simplest to most complex? a. Compound Element Atom Mixture b. Atom Element Compound Mixture c. Atom Mixture Compound Element d. Element Atom Mixture Compound How do you know? ______________________________________________________________________ 11. In the boxes below, draw what the particles look like in each state of matter and label them! (3 points) Metals Non-Metals WEDNESDAY: Periodic Table (worth 33 percent) Metalloids Stable Reactive Groups Periods 1. _____________________ are mostly gases, not very dense, and are good insulators because they do NOT allow heat or electricity to travel through them. 2. The noble gas family is the most ___________________ group because they have 8 valence electrons and do not easily react with other elements. 3. The horizontal rows on the periodic table are called _________________________. 4. ______________________ have properties of both metals and non-metals and located on the staircase. 5. Groups 1, 2, and 17 are the most _____________________ groups. 6. The vertical columns on the periodic table are called _________________________. 7. ______________________ are mostly shiny, solid, and good conductors located on the left side of the staircase. Fill in the following spaces based on the elements given below (10 points) 12 4 Mg Magnesium Be Beryllium 24.305 9.012 Atomic #:______________ Atomic Mass: __________ # protons:______________ # neutrons:_____________ # electrons:_____________ Atomic #:_____________ Atomic Mass:__________ # protons:_____________ # neutrons:____________ # electrons:____________ 8. Name 3 properties of metals: ________________________________________________________________________________________________ ________________________________________________________________________________________________ 9. Name 3 properties of non-metals: ________________________________________________________________________________________________ ________________________________________________________________________________________________ 10. Describe metalloids. What characteristics do they have? Where are they found on the PT? ________________________________________________________________________________________________ ________________________________________________________________________________________________ 11. Name ONE of the most reactive groups and explain why that group is one of the most reactive. ________________________________________________________________________________________________ ________________________________________________________________________________________________ THURSDAY: Properties & Changes (worth 33 percent) 19. Calculate the densities of the following substances then determine if they will sink or float in water (Recall: the density of water = 1.00 g/mL). a. Mass = 9 g; Volume = 3 mL; Density = _________________ Sink or float? __________________________ b. Mass = 2 g; Volume = 4 mL; Density = _________________ Sink or float? __________________________ Mass = 12 g; Volume = 2 mL; Density = _________________ Sink or float? __________________________ 20. Ms. Ball loves to make lemonade during the summer months using Country Time Lemonade Mix and ice cold water. a. Is this an example of heterogeneous or a homogeneous mixture? _______________________________ b. How do you know? _____________________________________________________________________ c. Identify the solute: _____________________________________________________________________ d. Identify the solvent: ____________________________________________________________________ 1. List the 4 signs of a chemical change: 1. __________________________________________ 2. __________________________________________ 3. __________________________________________ 4. __________________________________________ 2. Match the vocabulary word with the appropriate definition below: Reactant A. A substance produced during a chemical reaction Product Chemical Equation Coefficient B. Describes the chemical reaction using chemical formulas, subscripts, and coefficients. C. A substance that is present at the beginning of a chemical reaction. D. A number written before a chemical formula to show how many atoms or molecules are involved in the reaction.
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