Chemistry Quiz: Scientific Method and Definition
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Questions and Answers

What is the main focus of the study of Chemistry?

  • The structures, properties, compositions and interactions between matters (correct)
  • The use of chemicals in daily life
  • The reactions that occur in our daily lives
  • The mole concept and its applications

    • In the scientific method, what is the correct sequence of steps after making observations?

  • Making hypothesis, making inference, planning an experiment
  • Making inference, planning an experiment, making hypothesis
  • Making inference, making hypothesis, planning an experiment (correct)
  • Making hypothesis, planning an experiment, making inference

    • What is the primary function of the equipment shown in the diagram?

  • To protect the body and clothing from chemical spills
  • To wash and clean the eyes in case of an accident
  • To protect the respiratory organs from chemicals in the form of powder or fume
  • To protect the eyes from chemicals and dust (correct)

    • Which of the following is NOT a correct pair of field and chemical?

    <p>Industry and antioxidant</p> Signup and view all the answers

    What is the correct way to dispose of low concentrated hydrogen peroxide?

    <p>Pour it into the laboratory's sink directly</p> Signup and view all the answers

    What is the first step in managing an emergency case involving a chemical spill?

    <p>Stop the spill from spreading by using sand to border it</p> Signup and view all the answers

    What is the primary purpose of wearing protective equipment in a laboratory?

    <p>To protect the person from chemical exposure</p> Signup and view all the answers

    Why is it important to follow a specific sequence of steps in the scientific method?

    <p>To ensure accurate results</p> Signup and view all the answers

    What is the correct order of the halogens mentioned?

    <p>Iodine, Bromine, Chlorine</p> Signup and view all the answers

    What is the relative atomic mass of M(NO3)3 when its relative molecular mass is 213?

    <p>27</p> Signup and view all the answers

    What is the chemical formula of magnesium carbonate?

    <p>MgCO3</p> Signup and view all the answers

    Which of the following has the same number of atoms as 1 mol of Carbon?

    <p>0.5 mol of bromine gas, Br2</p> Signup and view all the answers

    What is the molar mass of calcium chloride hexahydrate (CaCl2.6H2O)?

    <p>219 g mol-1</p> Signup and view all the answers

    What is the empirical formula of butyl ethanoate?

    <p>C3H6O</p> Signup and view all the answers

    What is the number of total atoms in 1.5 mol of calcium nitrate, Ca(NO3)2?

    <p>2.709 × 10^24 atoms</p> Signup and view all the answers

    What is the correct sequence of actions to be taken in case of a chemical spill?

    <p>II, III, I, IV</p> Signup and view all the answers

    What is the volume of 26.4 g of carbon dioxide, CO2 at room conditions (24 dm3 mol-1)?

    <p>14.4 dm3</p> Signup and view all the answers

    What is the responding variable in Ahmad's experiment comparing the rate of corrosion between an iron nail and a steel nail?

    <p>Rate of rusting</p> Signup and view all the answers

    What can be deduced from the graph about the solubility of sugar?

    <p>The solubility of sugar increases when temperature increases</p> Signup and view all the answers

    What is the process of changing from a solid directly to a gas?

    <p>Sublimation</p> Signup and view all the answers

    Which elements have the same number of valence electrons according to Table 1?

    <p>P and S</p> Signup and view all the answers

    What is the standard representation of the atom of element Q?

    <p>40 18Q</p> Signup and view all the answers

    How many protons and electrons are found in atom R?

    <p>8 protons and 8 electrons</p> Signup and view all the answers

    What is true about the number of particles in atom X?

    <p>The number of protons is 8, the number of electrons is 10, and the number of neutrons is 8</p> Signup and view all the answers

    Which of the following elements has 10 electrons?

    <p>Neon</p> Signup and view all the answers

    What is the main function of cobalt-60?

    <p>Killing cancer cells</p> Signup and view all the answers

    What is the process by which iodine changes directly from solid to gas phase?

    <p>Sublimation</p> Signup and view all the answers

    What is the relative atomic mass of magnesium?

    <p>24.3</p> Signup and view all the answers

    Which of the following scientists introduced the plum pudding model?

    <p>J.J. Thomson</p> Signup and view all the answers

    Which of the following elements is in liquid state at room temperature?

    <p>Iodine</p> Signup and view all the answers

    What is the function of carbon-14?

    <p>Estimate fossils' age</p> Signup and view all the answers

    Which of the following pairs of elements has the same number of valence electrons in their atoms?

    <p>E and M</p> Signup and view all the answers

    What percentage of carbon is present in the compound with the empirical formula C7H14O2?

    <p>64.42%</p> Signup and view all the answers

    How many atoms are present in 5.1 g of ammonia gas, NH3?

    <p>7.224 × 10^23 atoms</p> Signup and view all the answers

    What is the percentage of iron in iron(II) sulphate heptahydrate, FeSO4.7H2O?

    <p>20.14%</p> Signup and view all the answers

    Which of the following compounds will produce the most number of molecules?

    <p>9 g of SO2</p> Signup and view all the answers

    Which of the following contains 6.02 × 10^23 atoms?

    <p>1 mol of magnesium</p> Signup and view all the answers

    Which of the following contains the same number of atoms as 0.24 g of carbon?

    <p>0.71 g of chlorine gas</p> Signup and view all the answers

    What is the value of x in hydrated magnesium sulphate, MgSO4.xH2O?

    <p>5</p> Signup and view all the answers

    What is the percentage of the lighter isotope in nitrogen, given the relative atomic mass of 14.007?

    <p>0.7%</p> Signup and view all the answers

    Study Notes

    Chemistry Definition and Scientific Method

    • Chemistry is the study of the structures, properties, compositions, and interactions between matters.
    • The scientific method consists of making observations, making inferences, making hypotheses, and planning an experiment in that order.

    Laboratory Safety and Equipment

    • The equipment shown is used for personal protection, and its function is to avoid dust or chemicals from coming into contact with the eyes.
    • Correct disposal methods for chemicals include pouring low concentrated hydrogen peroxide into the laboratory's sink directly.

    Variables and Scientific Investigation

    • In an experiment, the responding variable is the rate of corrosion between an iron nail and a steel nail.
    • The correct procedure to manage an emergency case involves stopping the spill from spreading, informing the teacher or laboratory assistant, making the spill site a restricted area, and cleaning the chemical spill.

    Graph Analysis and Solubility

    • The graph shows that when temperature increases, the solubility of sugar increases.
    • Process X is the melting process.

    Atomic Structure and Electron Arrangement

    • The atomic structure of atom Q is represented by 40/22Q.
    • The electron arrangement of R2- ion shows that it has 8 protons and 10 electrons.
    • The atom X has 4 protons, 4 electrons, and 5 neutrons.

    Particles and Elements

    • The particle that contains 10 electrons is Ne.
    • The pair of elements that has the same number of valence electrons is P and S.
    • J.J. Thomson introduced the atomic model.

    Functions of Radioisotopes

    • Cobalt-60 is used to kill cancer cells.
    • Carbon-14 is used to estimate fossils' age.

    Isotopes and Relative Atomic Mass

    • The relative atomic mass of magnesium is 24.3.
    • Magnesium exists naturally as three isotopes: 79% of Mg-24, 10% of Mg-25, and 11% of Mg-26.

    Sublimation and States of Matter

    • Ammonium chloride and iodine undergo sublimation when heated.
    • The substance that is in a liquid state at room temperature is the one with a melting point of -23 and a boiling point of 77.

    Chemical Formulas and Molecular Mass

    • The chemical formula of magnesium carbonate is MgCO3.
    • The molar mass of calcium chloride hexahydrate is 219 g mol-1.
    • The molecular formula of butyl ethanoate is CH3COOC4H9, and its empirical formula is C3H6O.

    Mole Concept and Gas Volume

    • The number of total atoms in 1.5 mol of calcium nitrate is 2.709 × 10^24 atoms.
    • The volume of 26.4 g of carbon dioxide at room conditions is 14.4 dm3.

    Empirical Formula and Molecular Formula

    • The molecular formula of glucose is C6H12O6.
    • The empirical formula of the compound that gives smell to fully ripe bananas is C7H14O2.

    Stoichiometry and Percentage Composition

    • The percentage of iron in iron(II) sulphate heptahydrate is 20.14%.
    • The number of atoms found in 5.1 g of ammonia gas is 7.224 × 10^23 atoms.
    • The compound that produces the most number of molecules is 9 g of SO2.

    Mole and Atomic Mass

    • 1 mole of magnesium contains 6.02 × 10^23 atoms.
    • 0.71 g of chlorine gas contains the same number of atoms as 0.24 g of carbon.

    Hydrated Compounds and Stoichiometry

    • The value of x in hydrated magnesium sulphate is 6.
    • The percentage of the isotope with the lighter mass in nitrogen is 99.3%.

    Hydrocarbon Compounds

    • The hydrocarbon compound that produces the sootiest flame is C3H6.

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