Grade Repair Compounds Test

What is the chemical formula for dinitrogen tetroxide?

• N₂O₄

• N₂O₃

• N₂O₂

• N₂O₅

What is the purpose of drawing Lewis structures?

• To visualize the arrangement of atoms and electrons in a molecule, aiding in understanding its chemical properties.

• To determine the molecular weight of a compound.

• To predict the boiling point of a substance.

• To identify the color of a chemical compound.

What is the role of valence electrons in chemical bonding?

• They are the innermost electrons of an atom.

• They are involved in forming bonds with other atoms.

• They determine the mass of the atom.

• They are responsible for the color of the atom.

What is the significance of the chemical formula in chemistry?

• It indicates the temperature at which a substance melts.

• It provides essential information about the composition and ratio of elements in a compound.

• It determines the color of the substance.

• It shows the physical state of the substance at room temperature.

What is the difference between a molecule and a compound?

• A molecule is formed when two or more atoms bond together, while a compound is a type of molecule that contains at least two different elements.

• A molecule is a single atom, while a compound is a group of atoms that are the same.

• A molecule can only consist of one type of element, while a compound can consist of multiple types of elements.

• A molecule is always larger than a compound, regardless of the number of atoms.

What is the concept of resonance in chemistry?

• Resonance refers to the way some molecules can be represented by two or more valid Lewis structures, indicating that the actual structure is a hybrid of these forms.

• Resonance is the phenomenon where molecules absorb energy and emit light at specific wavelengths.

• Resonance describes the tendency of molecules to form ionic bonds in the presence of a solvent.

• Resonance is the process by which molecules undergo a phase change from solid to liquid.

What is the significance of lone pairs in Lewis structures?

• Lone pairs represent non-bonding electrons that can affect the shape and reactivity of the molecule.

• Lone pairs are always involved in bonding between atoms.

• Lone pairs have no effect on the molecular geometry.

• Lone pairs are responsible for the color of the molecule.

How many valence electrons do most elements need according to the octet rule?

• 6

• 7

• 8

• 9

What is the chemical formula for cesium chloride?

• CsCl

• NaCl

• KCl

• LiCl

What is the difference between ionic and covalent bonds?

• Ionic bonds involve the sharing of electrons between atoms, while covalent bonds involve the transfer of electrons from one atom to another.

• Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons between atoms.

• Ionic bonds are formed between metals and non-metals, while covalent bonds are formed between two non-metals.

• Ionic bonds are stronger than covalent bonds in all cases.