Chemistry and Web Technologies Quiz
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Questions and Answers

What is the symbol for Gold?

  • Au (correct)
  • Ag
  • Cu
  • Pb

    • Copper's symbol is Co.

    False

    What element has the symbol 'N'?

    Nitrogen

    The symbol for Magnesium is ______.

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

    Match the following elements with their symbols:

    <p>Hydrogen = H Argon = Ar Oxygen = O Sodium = Na</p> Signup and view all the answers

    What does the Law of Conservation of Mass state?

    <p>Mass can neither be created nor destroyed in a chemical reaction.</p> Signup and view all the answers

    The Law of Constant Proportions states that elements in a compound can exist in varying proportions by mass.

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

    Name one chemical solution used in the activity.

    <p>Copper sulfate solution</p> Signup and view all the answers

    The law that states elements are always present in the same definite proportions by mass is called the Law of ______.

    <p>Constant Proportions</p> Signup and view all the answers

    Match the following laws of chemical combination with their definitions:

    <p>Law of Conservation of Mass = Mass can neither be created nor destroyed in a chemical reaction. Law of Constant Proportions = Elements are always present in the same definite proportions by mass.</p> Signup and view all the answers

    What is the primary purpose of HTML?

    <p>To structure web content</p> Signup and view all the answers

    CSS is used to create the structure of a web page.

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

    What does SQL stand for?

    <p>Structured Query Language</p> Signup and view all the answers

    The _______ is responsible for executing JavaScript on a web page.

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

    Match the following technologies with their primary functions:

    <p>HTML = Markup language for web content CSS = Language for styling JavaScript = Programming language for interactivity SQL = Language for database management</p> Signup and view all the answers

    What is the relative radius of a hydrogen atom?

    <p>$10^{-10}$ m</p> Signup and view all the answers

    The first letter of an element symbol is always lowercase.

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

    What did Dalton introduce to represent elements?

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

    The atomic radius is measured in __________.

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

    Match the following elements with their symbols:

    <p>Aluminium = Al Iron = Fe Chlorine = Cl Gold = Au</p> Signup and view all the answers

    Which of the following elements has the symbol 'Hg'?

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

    Atoms can be seen with the naked eye.

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

    What is the symbol for Carbon?

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

    Which of the following statements about molecules is true?

    <p>A molecule can exist independently.</p> Signup and view all the answers

    Ozone (O3) is a molecule that consists of two oxygen atoms.

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

    What atomic mass is defined as 1/12th the mass of a carbon-12 atom?

    <p>One atomic mass unit (amu)</p> Signup and view all the answers

    The molecular formula for the element that typically exists as a diatomic molecule is __________.

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

    Match the following elements with their atomic masses:

    <p>Hydrogen = 1 Carbon = 12 Nitrogen = 14 Oxygen = 16</p> Signup and view all the answers

    Which of the following elements is a non-metal that exists as a single atom?

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

    Compounds are formed when atoms of different elements combine in undefined ratios.

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

    What is the atomicity of chlorine?

    <p>2</p> Signup and view all the answers

    Which of the following elements exists as diatomic molecules?

    <p>Oxygen (O₂)</p> Signup and view all the answers

    Sodium chloride (NaCl) contains only negatively charged ions.

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

    What do you call ions that carry a positive charge?

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

    Water (H₂O) is composed of __________ and __________ in a ratio of 2:1.

    <p>hydrogen, oxygen</p> Signup and view all the answers

    Match the following compounds with their corresponding combining ratios:

    <p>Water (H₂O) = 2:1 Ammonia (NH₃) = 14:3 Carbon Dioxide (CO₂) = 3:8</p> Signup and view all the answers

    Which of the following represents a tetra-atomic molecule?

    <p>P₄</p> Signup and view all the answers

    All elements that form compounds do so in variable ratios.

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

    What term refers to the number of atoms in a molecule of an element?

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

    Which of the following formulas correctly represents a compound made of calcium and oxygen?

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

    The charges of the ions in magnesium chloride (MgCl₂) are not balanced.

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

    What is the valency of sulfur in hydrogen sulfide (H₂S)?

    <p>2</p> Signup and view all the answers

    The compound formed by aluminium and oxygen is ______.

    <p>Al₂O₃</p> Signup and view all the answers

    Match the following compounds with their corresponding formulas:

    <p>Hydrogen chloride = HCl Hydrogen sulfide = H₂S Magnesium chloride = MgCl₂ Calcium oxide = CaO</p> Signup and view all the answers

    What is the chemical formula for sodium sulfide?

    <p>Na₂S</p> Signup and view all the answers

    CaCl₂ has a molecular mass of 111 u.

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

    What does the term 'formula unit mass' refer to?

    <p>The sum of the atomic masses of all atoms in a formula unit of a compound.</p> Signup and view all the answers

    The molecular mass of water (H₂O) is _____ u.

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

    Match the following compounds with their names:

    <p>CaCl₂ = Calcium chloride K₂SO₄ = Potassium sulfate KNO₃ = Potassium nitrate CaCO₃ = Calcium carbonate</p> Signup and view all the answers

    What does a chemical formula represent?

    <p>The symbolic representation of a compound's composition</p> Signup and view all the answers

    Calcium oxide is composed of calcium and nitrogen.

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

    What is the valency of Aluminium?

    <p>3</p> Signup and view all the answers

    The formula for Sulphate is ______.

    <p>SO4^2-</p> Signup and view all the answers

    Match each ion with its corresponding valency:

    <p>Chloride = 2 Hydroxide = 1 Nitrate = 3 Copper (II) = 2</p> Signup and view all the answers

    Which of the following compounds is formed from sodium and chlorine?

    <p>Sodium chloride</p> Signup and view all the answers

    Iron can have a valency of both 2 and 3.

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

    What is the formula of the Carbonate ion?

    <p>CO3^2-</p> Signup and view all the answers

    What does the law of definite proportions state?

    <p>Elements in a compound are always present in a definite proportion by mass.</p> Signup and view all the answers

    Atoms are the smallest particles of a compound that can exist independently.

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

    What determines the chemical formula for molecular compounds?

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

    In ionic compounds, the formula is determined by the charge on the __________.

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

    Match the following terms with their definitions:

    <p>Chemical Formula = Shows constituent elements and number of atoms. Polyatomic Ion = Cluster of atoms with a fixed charge. Molecule = Smallest particle of an element or compound. Reactants = Substances consumed in a chemical reaction.</p> Signup and view all the answers

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