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RDA Science

Quiz by EVANGELINE PASCUAL

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50 questions
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  • Q1

    Your mother planted monggo seeds separately in cans. She used a different amount of fertilizer in germinating the seeds. The volume of each liquid is the same, and exposure to light was moderate. She found out that the monggo seeds germinated at different time. What is the independent variable in the set up?

    A.   the amount of sunlight

    B.  the amount of fertilizer

    C.    the different amount of liquids

    D.   the time of germination of the seeds

    30s
  • Q2

    You observe that the iron grills in your gate become rusty after the rain. You wonder why they become rusty. Which step in the scientific method is involved?

             

    C.  formulating hypothesis

    B. making conclusions

    D.    identifying the problem.

    A. gathering data

    30s
  • Q3

    For questions 3-4. You were tasked by your teacher to investigate howfast crushed salt dissolves in cold and hot water.

     

    Observing the fair testing, what will be your controlled variables?

    I.                   method of stirring

    II.                time each solution is stirred

    III.             amount of water in each cup

    IV.             time the solid is added to water

    V.               amount of crushed salt in each cup

    A.   I, II, and III

    B.    I, II, III, and IV

    D.   I, II, III, IV, and V.

    C.    I, III, IV, and V

    30s
  • Q4

    For questions 3-4. You were tasked by your teacher to investigate how fast crushed salt dissolves in cold and hot water.

    Which variable is being measured in your investigation?

    B.     the amount of crushed salt

    C.     the time the crushed salt will completelydissolve in hot water

    A.    the temperature of water.

    D.  the time the crushed salt will completely dissolve in hot and cold water

    30s
  • Q5

    Sodium chloride (NaCl), a combination of sodium(Na) and chlorine (Cl), is dissolved in water. After several days, the water evaporated, leaving the salt in the container. How will you classify the salt?

    C.  metal

    A.  compound.

    D.  mixture

    B.  element

    30s
  • Q6

    Which of the following statements is NOT TRUE?

     

    C.     Compounds are made up of one kind of element.

    B.     Compounds are more complex than elements

    D.    Components of water can be separated by electrolysis

    A.    Sodium chloride is made up of two elements

    30s
  • Q7

    Which of the following statements best describes the similarity between elements and compounds?

     

    B.    They are both listed in the periodic table

    D.   They are both made up of different kinds of atoms

    A.   They are both pure substances.

    C.    They can be both broken down by physical means

    30s
  • Q8

    You are curious if sulfur can conduct electricity. You tested it by dissolving the sulfur in the water and immersing the prongs of an electric conductor. The device did not produce any sound. How will you classify sulfur?

    A.   compound

    B.    metal

    C.    metalloid

    D.  non-metal

    C.  metaloid

    A.  compound

    D.  non - metal.

    B.  metal

    30s
  • Q9

    Which of the following statements is TRUE about elements and compounds?

    C.     Elements are more complex than compounds

    D.    Compounds are more complex than elements.

    A.    They have the same composition

    B.     They can be broken down by physical means

    30s
  • Q10

    Humans and animals absorb oxygen (O2)from the air they breathe in and release carbon dioxide (CO2).Carbon dioxide (CO2) is a/an________________.

    C.    element made of carbon and oxygen atoms

    D.   compound made of carbon and oxygen atoms.

    A.   mixture of carbon and oxygen atoms

    B.    solution made of carbon and oxygen atoms

    30s
  • Q11

    Your sister has an unopened box of a 40-meterfoil labeled 100% made of aluminum. Aluminum is a pure substance. She takes just a thumb size piece of aluminum foil. Which of the following statements is TRUE about the piece of aluminum foil your sister took compared with the rest left in the box?

    A.   Its mass and melting point are different

    A.   Its mass and melting point are different

    C.     Its mass is different but the melting point is the same.

    B.    Its mass and melting point are the same

    30s
  • Q12

    Compounds are different from mixtures because________________.

    A.   mixtures are held together by chemical bonds

    D.   compounds are held together by chemical bonds.

    B.    mixtures cannot be separated by physical means

    C.  compounds can be separated by physical means

    30s
  • Q13

    You were tasked by your teacher to check if the liquid sample you have is a substance or a mixture. Which of these tests will you use?

    I.    color comparison               III.  boiling point test

    II. taste comparison                IV.  melting pointtest

    C.    I, III, and IV only

    D.  I, II, III, and only 

    B.    I, II, and IV only

    A.   I and III only

    30s
  • Q14

    A liquid has the following properties: one phase, colorless, and varying boiling points. Which of the following BEST describes the liquid?

    D.   substance

    C.  mixture

    A.  compound

    B.  element

    30s
  • Q15

    1.         Given the following data, which of the solid samples are probably the SAME substances?

     

            Sample                   Color                Mass ( g )                 Melting Point (0C)            Density(g/mL)

           Solid 1                      Gray                       16                                      120                                               3.2

           Solid 2                      Brown                   18                                      115                                               3.2

           Solid 3                      Black                       17                                      130                                               2.5

    D. Solids 2 and 4

    B. Solids 2 and 3

    C. Solids 1 and 4

    A. Solids 1 and 2.

    30s

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