MUNTINLUPA NATIONAL HIGH SCHOOL GRADE 7 SCIENCE UNIT I : SUMMATIVE TEST Name: _____________________________________ Grade & Section: __________ 1. Direction: Read the questions carefully and choose the BEST answer for every situation given. You were asked to use litmus paper to test chemical X by your chemistry teacher. You have noticed that the blue litmus paper turns red. What changes in color of the litmus paper indicates? A. Strong Acid C. Weak Base B. Strong Base D. Weak Acid 2. About 25 of the known elements, according to scientists, are necessary for life. About 96% of the human body is made up of just four of these: carbon (C), oxygen (O), hydrogen (H), and nitrogen (N). What biological system element most important in human? A. Carbon C. Nitrogen B. Hydrogen D. Oxygen 3. Ferric pyrophosphate is one of the constituents in cereal drinks. What are the materials that make up this compound? A. Iron & Phosphate C. Oxygen & Phosphate B. Iron & Phosphate D. Oxygen & Iron 4. The chemical chlorine is one that is most frequently utilized commercial cleaning solution in most homes today. In what substance you can find the element chlorine? A. Sodium Acetate C. Sodium Carbonate B. Sodium Bisulfite D. Sodium Hypochlorite 5. Rock salt is one of the most commonly use compound that gives flavor to our food. What is the compound composition of rock salt? A. 1 atom of Na (Sodium) and 1 atom Cl (Chlorine) B. 2 atom of Na (Sodium) and 2 atom Cl (Chlorine) C. 3 atom of Na (Sodium) and 3 atom Cl (Chlorine) D. 4 atom of Na (Sodium) and 4 atom Cl (Chlorine) 6. What property of matter is used to classify floaters and sinkers? A. Density C. Weight B. Porosity D. Volume 7. A composition of two or more substances that are not chemically combined with each other and are capable of being separated. A. ElementC. Pure Substance B. Mixture D. Solution 8. What properties of table salt solution remained the same even at varying concentration? A. Chemical Composition B. Physical Composition C. Weight of the Solution D. Volume of the Solution 9. Which of the following properties identifies a pure substance? A. Soluble oil B. Tasteless and odorless C. Has a constant boiling temperature D. Can undergo several phase changes 10. If you will mix acetic acid and water, how many phases would you observe? A. One C. Three B. Two D. Four 11. Cookies, macaroni soup, and halo-halo are example of a ________. A. Compound C. Solutions B. Mixture D. Substance 12. A substance is a type of matter which is made up of specific compositions, they possess specific properties and cannot be separated by physical process into its chemical composition. Which of the following is example of a substance? A. Cupcake C. Soft drinks B. Milk D. Sugar 13. Which of the following group of substances consists of metallic elements? A. Aluminum, copper, potassium B. Phosphorus, chlorine, bromine C. Carbon, nitrogen, hydrogen D. Oxygen, carbon, sulfur 14. The food we take daily such as fish, meat, milk, and rice are mostly made up of the following elements. A. Argon, Neon, Helium, Krypton B. Carbon, Hydrogen, Oxygen, Nitrogen C. Fluorine, Chlorine, Sodium, Iodine D. Potassium, Phosphorus, Sulfur, Magnesium Score ______/25 15. A student investigates the nature of an unknown substance. He decided to heat a sample of a blue-green powder and eventually it turned into a colorless gas and a black solid. What would be the nature of the original substance and why? A. Substance, because it is made up of same materials. B. Mixture, because the material contains two or more substance. C. Compound, because heating the sample produced two different substances. D. Element, because the original sample can be further divided into simpler substance. 16. Solution is a liquid mixture in which the minor component (the solute) is uniformly distributed within the major component (the solvent). What is an example of a solution. A. Muddy water C. Rubbing alcohol B. Paint D. Seawater 17. Which of the following statements best describe a homogenous solution? A. Usually, liquid B. It contains a solute and solvent. C. You can still identify the components of the solution. D. The components are eventually distributed in the solution. 18. Which of the following is an example of a solid-solid solution? A. Ice C. Steel B. Sand D. Sugar 19. Calamansi juice is being dissolved in water. What component is the calamansi juice in the solution? A. Solubility C. Solvent B. Solute D. Suspension 20. You are given a 50 ml solution in a beaker. You add solute to the beaker and observes some particles did not dissolve even after stirring. What solution it is? A. Dilute, has a low concentration of the solute compared to the solvent. B. Saturated, contains the maximum concentration of its solute. This maximum concentration is the solute’s solubility limit. C. Supersaturated, contains more than the maximum amount of solute that is capable of being dissolved at a given temperature. D. Unsaturated, contain far less solute than they can hold. They may continue to dissolve the solute until they reach saturation. 21. How do you decrease the concentration of solution? A. Add more powder or solute. B. Add more water or solvent. C. Add more powder or solvent. D. Add more water or solute. 22. Gabbie prepared a solution mixing 25 g of powder orange juice in 75 g of cold water. What is the concentration of the solute and solvent in percent by mass? A. 5% solute, 95% solvent B. 15% solute, 65% solvent C. 5% solute, 95% solvent D. 255 solute, 75% solvent 23. Sukang sasa, a commercial vinegar that we buy in Sari-sari store contains 5% acetic acid which means that the solution contains? A. 0.5 ml of acetic acid and 99.5 ml of water. B. 5 ml of acetic acid and 95 ml of water. C. 50 ml of acetic acid and 50 ml of water. D. 500 ml of acetic and 500 ml of water. 24. Which solution is less concentrated? a. 2g of salt in 100 mL of water b. 5g of salt in 100 mL of water c. 10g of salt in 100 mL of water d. 25g of salt in 100 mL of water 25. A water molecule is made up of one oxygen and two hydrogen atoms. Why is water considered a pure substance? a. water can be combined with other substances by physical means b. water molecules are made up of different types of atoms c. water can be broken down by physical means d. each water molecule is identical Jeremiah 29:11 For I know the plans I have for you,” declares the LORD, “plans to prosper you and not to harm you, plans to give you hope and a future.” Good luck and God bless!
