3. Which of the following would create a chemical change when it is added to a glass of warm milk?

Transcription

1 Test Name: Science 8 Assessment 6 ReviewScan Test Code: Date: Your Name: Teacher: Class Name: 1. Which step in these instructions for making scrambled eggs results in a chemical change? First, crack two eggs into a bowl. Then, add one tablespoon of milk and mix well. Pour the raw egg mixture into a hot nonstick frying pan. Cook the eggs until they are solid. A cracking the eggs B adding in milk C pouring the mixture D cooking the eggs 2. Burning a piece of paper leaves a small amount of ash. Which of the following shows evidence that this is a chemical change? A Paper has different properties than ash. B Paper has the same properties as ash. C Paper is a solid while ash is not. D Paper is malleable while ash is not. 3. Which of the following would create a chemical change when it is added to a glass of warm milk? A sugar B ice cube C lemon juice D salt 4. Which one of the following is a chemical change? A boiling water B rusting iron C condensation D mixing salt and water 5. Janice adds two clear liquids together and swirls around the container of the new solution. Which of the following would be a good indicator that a chemical change has occurred? A The solution changes volume. B The solution remains clear. C The solution increases in mass. D The solution produces heat. Copyright 2009, Core K12 Education, L.L.C. All rights reserved. Page 1 of 7

2 6. Which of the following is an example of a chemical reaction? A Cutting paper B Melting an ice cube C Burning a candle D Dissolving sugar in water 7. A small cube of a substance is added to a container of dilute acid and the results observed. Which of the following observations would be least likely to indicate that a chemical reaction has occurred? A Heat is generated. B The color changes. C Gas is produced. D The cube crumbles. 9. Why is flammability a chemical property rather than a physical property? A because it does not change the identity of the material B because there are no new substances formed C because it involves the changing of chemicals into a new substance D because the old substance is not destroyed 10. Which of the following determines the identity of an element? A atomic number B mass number C atomic mass D overall change 8. A compound is formed when two or more elements chemically react and join together to form a new substance. What then can you conclude about a compound? A The compound can be broken down through pressure. B The compound will have different properties than the original element(s). C The compound will be more unstable than the individual elements. D The compound will be able to undergo another physical change. 11. Most nonmetals are A shiny when lit with an ultraviolet light. B poor conductors of electric current. C flattened when hit with a hammer. D solids at room temperature. Copyright 2009, Core K12 Education, L.L.C. All rights reserved. Page 2 of 7

3 12. Why are the properties of sodium (Na) more like the properties of lithium (Li) than like the properties of magnesium (Mg)? A Na and Li are lighter than Mg. B Na and Li have nearly the same number of protons. C Na and Li are in the same group. Mg is in a different group. D Na and Li are in the same period. Mg is in a different period. 13. In the periodic table, how are elements that have similar structure and properties placed? A by period B by group C by isotope D by series Copyright 2009, Core K12 Education, L.L.C. All rights reserved. Page 3 of 7

4 14. Read the periodic table of elements. Which of the following elements has the most protons? A cadmium B carbon C calcium D chromium Copyright 2009, Core K12 Education, L.L.C. All rights reserved. Page 4 of 7

5 15. Use this portion of the periodic table to identify the number of protons in a single atom of nitrogen. 17. Metals are used for cooking utensils because they are classified as having excellent A melting temperature B melting temperature C hardness D thermal & electrical conductivity A 6 B 7 C 14 D What do all elements in the same group have in common? A atomic mass B atomic weight C chemical properties D physical properties 18. In the chemical reaction between hydrochloric acid ( ) and calcium carbonate ( ), which of the following elements cannot be part of the products? A carbon (C) B nitrogen (N) C chlorine (Cl) D hydrogen (H) 19. Like the one below, chemical equations must be balanced. This shows that A the atoms on the reactant side are changed into different atoms on the products side. B the chemical reaction is not reversible. C the chemical reaction is reversible. D the number of atoms in the reactants is equal to the number of atoms in the product. Copyright 2009, Core K12 Education, L.L.C. All rights reserved. Page 5 of 7

6 20. It is important to write chemical formulas properly to show what is happening in a reaction. Which of the following is true of the equation below? CaCO 3 + 2HCl CaCl 2 +H 2 CO 3 A The 2 after the CaCl indicates 2 molecules of CaCl. B The 2 before the HCl indicates 2 molecules of HCl. C The 3 after the CaCO indicates 3 atoms of cobalt. D The 3 after the CaCO indicates 3 molecules of CO. 21. The photosynthesis equation shows that for each molecule of glucose you need A 12 molecules of carbon dioxide and 6 molecules of water. B 6 molecules of carbon dioxide and 6 molecules of water. C 6 molecules of oxygen and 12 molecules of carbon dioxide. D 1 molecule of carbon dioxide and 6 molecules of water. 22. How many carbon atoms are shown in this formula? A 6 B 12 C 18 D A physical property of non-metals is that they are good insulators. This makes them a good choice for which of the following uses? A making pots for cooking on a stove B making mugs to keep coffee warm C making a heater to warm a room D conducting electricity in electrical wires Copyright 2009, Core K12 Education, L.L.C. All rights reserved. Page 6 of 7

7 24. Which of the following is a chemical property of glass that makes it a better choice than metal for making containers for the storage of highly corrosive hydrochloric acid (HCl)? A Glass has a high melting point. B Glass is not flammable. C Glass is not reactive with HCl. D Glass is transparent. 25. Plastic is a good material to wrap around electrical wires. This is because A it melts quickly when too much electricity goes through it. B it is a good insulator and does not allow electricity to go through it. C it is a good conductor and does not allow electricity to go through it. D it has a strong odor when it melts so you can prevent fires. Copyright 2009, Core K12 Education, L.L.C. All rights reserved. Page 7 of 7