Gr 9 NATURAL SCIENCES: CH 2.1 Elements and compounds

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Questions and Answers

What is a compound?

  • A substance made up of only one kind of atom
  • A substance made up of two or more different kinds of atoms (correct)
  • A substance made up of atoms arranged in a regular pattern
  • A substance made up of two atoms of the same element

What do water and hydrogen peroxide have in common?

  • They have the same physical properties
  • They are both elements
  • They contain hydrogen and oxygen (correct)
  • They have the same chemical formula

What is a molecule?

  • A regular, repeating pattern of atoms
  • A smallest repeating unit that represents a compound's composition
  • A cluster of atoms that are bonded together in a specific manner (correct)
  • A substance made up of only one kind of atom

What is the difference between a molecule and a crystal lattice?

<p>A molecule is a cluster of atoms, while a crystal lattice is a regular pattern of atoms (B)</p> Signup and view all the answers

What is the purpose of a chemical formula?

<p>To represent the composition of a compound (A)</p> Signup and view all the answers

What is the formula unit of sodium chloride?

<p>NaCl (D)</p> Signup and view all the answers

What is the result of a chemical reaction?

<p>The formation of new molecules (C)</p> Signup and view all the answers

What do the subscripts in a chemical formula indicate?

<p>The number of each type of atom in a molecule (B)</p> Signup and view all the answers

What is an element?

<p>A substance made up of only one kind of atom (C)</p> Signup and view all the answers

What is a diatomic molecule?

<p>A molecule made up of two atoms of the same element (D)</p> Signup and view all the answers

What is unique about each compound?

<p>Its chemical formula (A)</p> Signup and view all the answers

What is the role of chemical bonds in a compound?

<p>They attract the atoms in a molecule (B)</p> Signup and view all the answers

What is the fixed ratio of atoms in a compound?

<p>Fixed, giving the compound its unique properties (A)</p> Signup and view all the answers

What is the difference between water and hydrogen peroxide?

<p>Water has a fixed ratio of 2 hydrogen atoms to 1 oxygen atom, while hydrogen peroxide has a fixed ratio of 2 hydrogen atoms to 2 oxygen atoms (D)</p> Signup and view all the answers

What is the difference between water and hydrogen peroxide?

<p>Their chemical formulas (D)</p> Signup and view all the answers

What is a characteristic of a compound?

<p>It is made up of two or more different kinds of atoms (C)</p> Signup and view all the answers

What happens to the atoms in a chemical reaction?

<p>They rearrange themselves to form new molecules (A)</p> Signup and view all the answers

What is the significance of the fixed ratio of atoms in a compound?

<p>It gives the compound its unique properties (B)</p> Signup and view all the answers

What is the purpose of a chemical name?

<p>To uniquely identify a compound (B)</p> Signup and view all the answers

What is the result of the reaction between hydrogen and oxygen?

<p>The formation of water (A)</p> Signup and view all the answers

What is the primary reason for the formation of compounds?

<p>Atoms desire to achieve more stable configurations. (D)</p> Signup and view all the answers

What is represented by the chemical formula of a compound?

<p>The types and numbers of atoms in a molecule. (C)</p> Signup and view all the answers

During a chemical reaction, what happens to the bonds between atoms?

<p>New bonds form and old bonds break. (B)</p> Signup and view all the answers

What is the significance of the subscript in a chemical formula?

<p>It indicates the number of each type of atom. (B)</p> Signup and view all the answers

What determines the distinct properties of water and hydrogen peroxide?

<p>The ratio of hydrogen to oxygen atoms. (B)</p> Signup and view all the answers

What is the result of the reaction between hydrogen and oxygen?

<p>Formation of water. (C)</p> Signup and view all the answers

What type of forces hold atoms together in a compound?

<p>Chemical bonds. (A)</p> Signup and view all the answers

What is true about the atoms in a compound?

<p>They are mixed together in a fixed ratio. (A)</p> Signup and view all the answers

What is the purpose of a chemical formula?

<p>To represent the composition of a compound. (B)</p> Signup and view all the answers

What happens when atoms rearrange themselves during a chemical reaction?

<p>They become more stable. (C)</p> Signup and view all the answers

What is the main characteristic of the atoms in a compound?

<p>They are combined in a fixed ratio. (C)</p> Signup and view all the answers

What is the term for the smallest repeating unit of a compound that represents its composition?

<p>Formula unit (A)</p> Signup and view all the answers

What is the difference between water and hydrogen peroxide?

<p>The ratio of hydrogen to oxygen atoms. (B)</p> Signup and view all the answers

What is the term for a group of atoms bonded together in a specific manner?

<p>Molecule (A)</p> Signup and view all the answers

What is the arrangement of atoms in a crystal lattice?

<p>Regular and repeating (A)</p> Signup and view all the answers

What is the characteristic of elements that naturally exist as diatomic molecules?

<p>They consist of two atoms of the same element. (A)</p> Signup and view all the answers

What is the result of combining atoms in a fixed ratio?

<p>A compound with unique properties (A)</p> Signup and view all the answers

What is the difference between a molecule and a compound?

<p>A molecule is a group of atoms, while a compound is a substance made up of molecules. (D)</p> Signup and view all the answers

What is the characteristic of the atoms in a water molecule?

<p>They are a combination of hydrogen and oxygen atoms. (C)</p> Signup and view all the answers

What is the purpose of the fixed ratio of atoms in a compound?

<p>To give the compound its unique properties (C)</p> Signup and view all the answers

Which of the following is an example of a diatomic molecule?

<p>Oxygen (Oâ‚‚) (A)</p> Signup and view all the answers

What is the smallest repeating unit that represents the composition of a compound in a crystal lattice?

<p>Formula unit (B)</p> Signup and view all the answers

Which of the following compounds has a fixed ratio of 2 hydrogen atoms to 2 oxygen atoms?

<p>Hydrogen peroxide (Hâ‚‚Oâ‚‚) (C)</p> Signup and view all the answers

What is the primary reason for the unique properties of a compound?

<p>The fixed ratio of atoms in the compound (C)</p> Signup and view all the answers

Which of the following is NOT an example of a compound?

<p>Oxygen (Oâ‚‚) (A)</p> Signup and view all the answers

What is the term for the arrangement of atoms in a repeating pattern in a compound?

<p>Crystal lattice (A)</p> Signup and view all the answers

Which of the following elements naturally exists as a diatomic molecule?

<p>Oxygen (Oâ‚‚) (B), Hydrogen (Hâ‚‚) (C), Chlorine (Clâ‚‚) (D)</p> Signup and view all the answers

What is the result of combining atoms in a fixed ratio?

<p>Formation of a compound (B)</p> Signup and view all the answers

Which of the following statements is true about the atoms in a compound?

<p>Atoms in a compound are always of different elements (A)</p> Signup and view all the answers

What is the characteristic of molecules that are composed of two or more different kinds of atoms?

<p>They are molecules (C)</p> Signup and view all the answers

Which of the following statements is true regarding the atoms in a compound?

<p>The atoms in a compound are held together by chemical bonds. (C)</p> Signup and view all the answers

What is the significance of subscripts in a chemical formula?

<p>They indicate the number of each type of atom in a molecule. (B)</p> Signup and view all the answers

What is the primary reason for the formation of a compound during a chemical reaction?

<p>Atoms rearrange themselves to achieve a more stable configuration. (B)</p> Signup and view all the answers

What is the characteristic of a compound that distinguishes it from other compounds?

<p>Its unique name and chemical formula. (A)</p> Signup and view all the answers

What happens to the atoms in a chemical reaction that forms a compound?

<p>Atoms combine in a fixed ratio to form a compound. (B)</p> Signup and view all the answers

What is the significance of the chemical formula of a compound?

<p>It indicates the types and numbers of atoms in a molecule of the compound. (B)</p> Signup and view all the answers

What is true about the chemical bonds in a compound?

<p>They are attractive forces that bind atoms together. (B)</p> Signup and view all the answers

What is the result of the reaction between hydrogen and oxygen?

<p>Water is formed. (B)</p> Signup and view all the answers

What is the characteristic of the chemical formula of hydrogen peroxide?

<p>It has a subscript of 2 for oxygen. (A)</p> Signup and view all the answers

What is the significance of the ratio of atoms in a compound?

<p>It determines the distinct properties of the compound. (A)</p> Signup and view all the answers

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