SCIENCE 7 SCIENCE 7 – – QUARTER 1 QUARTER 1 CHRISTINE JOY M. TEJOLAN Science Teacher firstname.lastname@example.org
Learning competencies: • Describe the components of a scientific investigation - S7MT-Ia-1 • Recognize that substances are classified into elements and compounds - S7MT-Ig-h-5 • Distinguish mixtures from substances based on a set of properties - S7MT-Ie-f-4 • Investigate properties of unsaturated or saturated solutions - S7MT-Ic-2 • Express concentrations of solutions quantitatively by preparing different concentrations of mixtures according to uses and availability of materials - S7MT-Id-3 Directions: Read and analyze each statement very carefully. Encircle the letter of the correct answers. Any kind of erasure is not allowed. Answer it honestly. 1. A series of steps designed to help you solve problems and answer questions. A. Experiment B. Hypothesis C. Observation D. Scientific method 2. Bell is interested in finding oit if older siblings are better students than younger siblings. How should his research be stated? A. Do older students make better grades? B. Is there any relationship between birth order and academic achievement? C. Is your little sister smarter than you? D. Is there a correlation between age and grade point average? 3. Which of the following statements are true about scientific method? I. Identification of the problem should also set limits and scope of the experiment? II. The conclusion should always support the hypothesis. III. The hypothesis is an intelligent guess that can be verified or contradicted by the results of the experiment. A. I and II B. I and III 4. While on the beach side you have noticed two men dumping barrels of unknown liquid, then you have observed that the liquids spilled in the beach. You infer that it might affect the living things around the beach and might be affecting the lives of the people in the community. If you are going to respond to this situation, what investigation would you most likely to perform? A. Inventing a record on numerous safeguards to prevent the accident from occurring. B. Listing safeguards that were not in place to prevent the accident from occurring. C. Sampling on the effects of various elements that contaminates the beach line. D. Identifying the level of contamination of chemicals in sea water at the area. 5. What is the correct order of steps in the scientific method? A. Ask a question, make a hypothesis, test the hypothesis, draw conclusions, and analyze results. B. Ask a question, make a hypothesis, test the hypothesis, analyze results, and draw conclusions. C. Ask a question, analyze results, make a hypothesis, test the hypothesis, and draw conclusions. D. Make a hypothesis, test the hypothesis, analyze results, ask a question, and draw conclusions. 6. Which of the following statements correctly describes a compound? I. It can be broken down into a simpler type of matter by chemical means. II. It has unique properties that are different from the properties of its individual elements. C. II and III D. I,II,III
It is composed of atoms of two or more elements that bond together. It is composed of atoms of the same kind. A. I, II, III, IV B. I, II, III only C. I, II, IV only D. II, III, IV only 7. Which of the following will be the result of compound if Hydrogen gas and oxygen gas combine? A. Hydrogen Peroxide B. Salt C. Sugar D. Water 8. Sodium is a silvery solid that reacts violently with water and chlorine. When they combine to form the compound sodium chloride known as salt, there is a fundamental change in the properties. Salt is often added to our food when cooking and it is safe to eat. Which of the following statements supports the idea presented? A. True to all compounds, they no longer have the properties of the elements that makes them up. B. True to some compounds, it maintains the properties of the elements that makes them up. C. True in all elements, it maintains its properties even after it combines with other elements. D. True to all elements, they have the properties after they are combined. 9. What elements made up the compound Carbon Dioxide? A. Carbon and Carbon B. Carbon and Oxide C. Carbon and Oxygen D. Carbon and Hydrogen 10. Which of the following is correctly matched? I. Nitrogen: Element: Nitrous Oxide: Compound II. Iron: Element: Rust: Compound III. Mercury: Element: Copper: Compound IV. Oxygen: Element: Water: Compound A. I, II, III, IV B. I, II, III only C. I, II, IV only D. I and II only 11. Which of the following CANNOT be broken down into simple substance? A. Chemical Formula B. Compound C. Element D. Mixture 12. Which of the following set of properties talks about a compound? I. Made up of one or more atoms II. Joined through chemical process III. Composed of one or more substance IV. Mixtures of one or more different substances III. IV.
A. I and II only B. II and III only C. III and IV only D. I, II, III, IV 13. When carbon and oxygen is combined through chemical process they will end up producing a ______? A. Element B. Compound C. Substance D. Acid 14. Passing electricity through water causes the H2O molecules to decompose into its elements. The word equation that best describes this chemical change is A. hydrogen + oxygen -----> water B. water -----> hydrogen + oxygen C. water -----> steam D. water -----> hydrogen + nitrogen 15. A pinch of bread was placed inside a test tube and heated until it became blackish in color and released some gas. Which of the following statement/s is/are true according to the given information? I. Bread is solution. II. Bread is composed of only one substance. III. Bread is made up of solid and gaseous substances. IV. Bread is made up of mixtures of different substances. A. I only B. II & III C. II only D. III & IV 16. A white powder was tested and heated. After some time, it melts completely. What does it imply? A. It is a mixture. B. It is a pure substance. C. It is a homogeneous mixture. D. It is a combination of pure substance and mixture. 17. Water boils at 100˚C and pure ethanol at 78˚C. Which of the statements are TRUE about water and ethanol? I. Water and ethanol are pure substances. II. Water and ethanol can be boiled at either 100˚C or 78˚C. III. Water and ethanol have specific temperatures at which they would start to boil. IV. Water and ethanol can be identified according to temperature at which they boil. A. I only B. I, II and IV C. III only D. I, III, and IV 18. Ethan wants to separate the marbles in a jar full of water. Which of the following is the best way to separate the mixture? A. Decantation B. Dissolving C. Evaporation D. Using a magnet
19. An unknown, clear liquid is given to you in a beaker. You transfer the liquid from the beaker to a clean, empty test-tube, and begin to heat it. After a while, you see vapors rising from the test-tube, and pretty soon, all that's left are a few crystals of salt stuck to the edges. How would you classify the material? A. element B. compound C. mixture D. colloid 20. A sample of a salt and water solution is homogeneous throughout. Is this sample a mixture or a pure substance? A. a pure substance, since it is the same throughout B. a mixture, because it can have a variable composition C. pure substance, because it has a definite composition D. a mixture, because it has a fixed, definite composition 21. Ana wants to compare the chemical properties of two substances. In doing it, he prepared two flasks containing the substances and labeled them Liquid A and Liquid B. He monitored the boiling points of the liquids and found that the boiling points were 100˚C for substance A and 110˚C - 112˚C for liquid B. How would you classify the two liquids? A. Liquid A is pure substance while Liquid B is a mixture. B. Liquids A and B contain two or more atoms that are chemically bonded. C. Liquid A has varying boiling points while liquid B has a fix boiling point. D. Liquid A maybe homogenous or heterogeneous but substance B is not. 22. The two components of a solution are solute and solvent. Which statement describe the solute? A. It is solid formed in the solutions. B. Ir is liquid component of he solution. C. It is the component of a solution in smaller quantity. D. It is th component of a solution in bigger quantity. 23. Naphthalene, commonly known as “alcamphor” ,can be dissolved in benzene. From this information, one can conclude that A. naphthalene and benzene are both solutes B. naphthalene is the solute, and benzene is the solvent C. benzene is the solute, and naphthalene is the solvent D. naphthalene and benzene are both solvents 24. Joy is working at a local candied fruit factory. She noticed that when sugar is added to the water in candy making process , there remain undissolved particles that settle at the bottom of the container. Which of the following will best solve the problem? A. Shake the mixing container very well. B. Stir the liquid vigorously. C. Incorporate the sugar with other ingredients,add water then stir. D. Dissolve first the sugar in hot water before adding it into large amount of water in the container. 25. Analyn wants to surprise her parents on their wedding anniversary. She cooked Beef stew (Caldereta) . After putting all the ingredients, she tasted the mixture and found out that it is salty. Which of the following would be the best solution to Analyn’s problem? A. Add more water into the mixture and let it boil again until the desired taste is attained B. Remove some spice, add water then boil again.
C. Remove the beef cubes, wash them and put them back into the mixture. D. Remove the sauce and replace it with water. 26. You are given a 40 mL solution in a beaker. You add solute to the beaker and you observed some particles did not dissolve. What solutions is it? A. Saturated B. Unsaturated C. Concentrated D. Supersaturated 27. What is the percentage concentration in the following solution given 2g sucrose in 80g water? A. 2.4% B. 2.5% C. 4.0% D. 97.6% 28. How many grams of glucose are needed to prepare 400mL of 5% glucose solution? A. 5g B. 10g C. 14g D. 20g 29. What is the percent by mass concentration of a solution that contains 6.0g of sugar dissolved in 20.7g of water? A. 21.21% B. 22.21% C. 22.47% D. 22.74% 30. A solution is prepared by mixing a 20g of sodium chloride in 80g of water. What are the concentrations of the solute and solvent in % by mass? A. Solute: 10% ; Solvent: 90% B. Solute: 20% ; Solvent: 80% C. Solute: 30% ; Solvent: 70% D. Solute: 40% ; Solvent: 60%
Dehydration, the loss of water from the body causes an imbalance in important minerals in the body such as sodium and potassium which are needed for muscles and nerve functions. To combat dehydration, oral rehydration solution (ORESOL) must be taken. ORESOL is readily available in drugstores and hospitals but can also be prepared at home. If you have an internet connection, try to look in literature or government health agency website, if none, make an interview in some individuals with medical background (nurse, midwife or Science teacher) in your community on how you are going to prepare ORESOL at home. Write down information you have gathered creatively. You can present it using brochures or pamphlets. Include the materials you needed and the procedures to be done. Picture below is an example of brochure/pamphlet. Your work will be graded according to the rubric below: CATEGORY 4 3 2 1 Content - Accuracy All facts in the brochure are accurate. It answered the question on how ORESOL can be prepared. 89-85% of the facts in the brochure are accurate. It somehow answered the question on how ORESOL can be prepared. 84-80% of the facts in the brochure are accurate. Few information answered question on how ORESOL can be prepared. Most sections of the brochure have a clear beginning, middle and end. Fewer than 79% of the facts in the brochure are accurate. It did not answer the question on how ORESOL can be prepared. Less than half of the sections of the brochure have a clear beginning, middle and end. Writing - Organization Each section in the brochure has a clear beginning, middle, and end. Almost all sections of the brochure have a clear beginning, middle and end. Knowledge Gained All students in the group can accurately answer all questions related to facts in the brochure and to technical processes used to create the brochure. All students in the group can accurately answer most questions related to facts in the brochure and to technical processes used to create the brochure. Most students in the group can accurately answer most questions related to facts in the brochure and to technical processes used to create the brochure. The brochure has well- organized information. Several students in the group appear to have little knowledge about the facts or technical processes used in the brochure. Attractiveness & Organization The brochure has exceptionally attractive formatting and well- organized information. The brochure has attractive formatting and well- organized information. The brochure\'s formatting and organization of material are confusing to the reader. Graphics do not go with the accompanying text or appear to be randomly chosen. Graphics/Pictures Graphics go well with the text and there is a good mix of text and graphics. Graphics go well with the text, but there are so many that they distract from the text. Graphics go well with the text, but there are too few and the brochure seems \"text-heavy\".