Question

1.The molecular formula represents the______ of a molecule of an element or compound.
2.Mixtures are either homegeneous or_____________________

Answer 1

Answer:

1.A molecular formula is a representation of a molecule that uses chemical symbols to indicate the types of atoms followed by subscripts to show the number of atoms of each type in the molecule. (A subscript is used only when more than one atom of a given type is present.) Molecular formulas are also used as abbreviations for the names of compounds.

The structural formula for a compound gives the same information as its molecular formula (the types and numbers of atoms in the molecule) but also shows how the atoms are connected in the molecule. The structural formula for methane contains symbols for one C atom and four H atoms, indicating the number of atoms in the molecule (Figure 1). The lines represent bonds that hold the atoms together. (A chemical bond is an attraction between atoms or ions that holds them together in a molecule or a crystal.) We will discuss chemical bonds and see how to predict the arrangement of atoms in a molecule later. For now, simply know that the lines are an indication of how the atoms are connected in a molecule. A ball-and-stick model shows the geometric arrangement of the atoms with atomic sizes not to scale, and a space-filling model shows the relative sizes of the atoms.

2.homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample. Conversely, a heterogeneous mixture has components in which proportions vary throughout the sample. "Homogeneous" and "heterogeneous" are not absolute terms, but are dependent on context and the size of the sample. In chemistry, if the volume of a homogeneous suspension is divided in half, the same amount of material is suspended in both halves of the substance. An example of a homogeneous mixture is air.

Answer 2

1. The molecular formula represents the number of atoms of an element of the molecule or compound.

2. Mixtures are either homogeneous or heterogeneous.

• The molecular formula expresses the number of atoms of each element in a compound molecule.
• The molecular formula, which is derived from molecules, reflects the total number of individual atoms that make up a compound's molecule.
• The actual number of each type of atom in a compound's molecule is reported by a subscript in a molecular formula.

• A mixture can be either homogeneous or heterogeneous: homogeneous mixtures have their constituents distributed uniformly, like salt in water; heterogeneous mixtures have their constituents clearly separated from one another, like sand in water.
• In addition, "uniform mixture" and "non-uniform mixture" are other terms for homogeneous mixtures and heterogeneous mixtures, respectively.
• These terms come from the idea that a homogeneous mixture has an even distribution of particles, which results in a uniform appearance or only one discernible phase.
• However, a heterogeneous mixture's constituent substances can be easily distinguished from one another and has a non-uniform composition.

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