Tuba National High School

Name __________________________ Year and Section ________

Tuba National High School-Extention Poblacion Tuba, Benguet Chemistry Score ______________ Date ______________

QUIZ 2 DETERMINING THE NUMBER OF SIGNIFICANT FIGURES Identify the number of significant figures in each of the following numbers. 1. 7639 = 6. 2.0004 = 2. 0.0006 = 7. 0.008060 = 3. 1605 = 8. 0.078 = 4. 36.0 = 9. 3 x 105 = 5. 0.36740 = 10. 8.00 x 103 = Round of each of the following to two significant figures. 1. 4.678 = 6. 0.03457 2. 8.55 = 7. 0.9246 3. 36.4 = 8. 0.2486 4. 376 = 9. 9420 5. 6.250 = 10. 7.456

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Solve for the final answer of the following mathematical problems and indicate the numbers of signifinicant figures. Use back page of the paper (5 points each) 1. Find the sum of 65.50 cm, 1.388 cm, 125.3 cm, and 6.45 cm. 2. Subtract 29.483 mL from 38.75 mL. 3. Multiply 18.5 by 0.0031. 4. Divide 86.0 by 23.0. APPLYING SCIENTIFIC NOTATION IN MATHEMATICAL EQUATIONS Give the scientific notations of the following mathematical problems. (2 points each) 1. A single drop of water may contain 1700000000000000000000 particles (molecules) of water. 2. The mass of an electron in decimal form is 0.000000000000000000000000000000911 kg. Write the following in scientific notations: 1. 0.0094910 = 2. 0.0004412 = 3. 0.0000760 = Solve the following problems: (2 points each) 1. Find the sum of 5.1 x 105and 3.0 x 103 2. Subtract 4.9 x 104 from 2.5 x 105 3. Multiply 7.4x 103 kg by 2.1 x 1053 kg 4. Divide 3.6x 104 m2 by 6.02 x 103 m

4. 0.0000000390 5. 0.00004830

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Name ___________________________ Year and Section __________________

Date _________ Group no. _____

SUMMARY ON THE CLASSIFICATION OF MATTER OBJECTIVES: At the end of the activity, the students should be able to summarize the classification of matter. PROCEDURE: Read the questions below and fill up the blanks. After which, use your answers to fill up the chart prepared for you on the classification of matter.

1. __________________ are substances made of one kind of material with a unique set of chemical and physical properties which are consistent wether dealing with a large sample or just a small piece. 2. In chemistry ____________ is a fundamental particle from which all other things are built. They can not be decomposed further to simpler substances by ordinary chemical process. 3. ________________ such as copper, tin, and silver, can be shaped into wires or hammered into flat sheets and exsists as solid at room temperature except mercury which is liquid. 4. Semiconductors or ______________ exhibit metallic and non-metallic properties. Like non-metals, they are brittle when solid but like metals, they are able to conduct electricity under certain conditions. 5. On the other hand, most of those which take the form of gas, or liquid are classifies as __________. 6. When atoms of hydrogen gas and oxygen gas combines chemically in the same fixed proportion by mass, water is formed, which is a _________________. 7. Kalamansi, vinegar and aspirin have a common sour taste. This is because they contain _________. If tested on a blue litmus paper, the blue litmus paper will turn into red. 8. Do you know that chalk is a _________________? Probably you only know one example and that is sodium chloride, a product of the neutralization reaction. 9. _____________ are normally bitter and are slippery to touch. When dissolved in water, they yield hydroxide ions. 10. Usually, ____________ can be separated by a simple operation that does not change the composition of the substances that comprises it. 11. Table sugar completely dissolve in water exhibits a uniform appearance. You not be able to directly pick out the sugar molecules from water molecules since it is said to be ______________________. 12. ______________________ have two components, a solute (the substance to be dissolve) and the solvent (dissolving medium). Usually the solvent is grater in quantity than the solute. 13. If you add a table spoon of vegetable oil into a glass of water, what will you see? Two distinct phasesthe oil phase and the water phase. In this case, we call oil and water as a __________________ mixture. 14. Do you drink milk? Do you love ice cream? Does your sandwich contain mayonnaise? Do you use foam in your pillow? The things mentioned are examples of ___________________. 15. Mixtures of sand and gravel because of their individual physical properties. Another example of this mixture is sand and water.