Question

comprehension check questions chem 1.3_matter

1. what is the definition of chemistry?
2. what is matter?
3. sketch an image that highlights the differences between an element vs. a compound. be sure to label which is which.
4. sketch an image that highlights the differences between a homogeneous mixture vs. a heterogeneous mixture. be sure to label which is which.
5. for the following descriptions, please write “pp” for physical property, and “cp” for chemical property:

flammable burnable rusting iron
density magnetic subliming dry ice
color temperature molding clay
length volume bending wire
combustible breaking chalk burning toast

1. what is the law of conservation of matter?

Explanation:

1. Chemistry is the scientific study of the properties and behavior of matter. It involves understanding the composition, structure, and reactions of substances.
2. Matter is anything that has mass and takes up space. It is made up of atoms and molecules.
3. An element consists of only one type of atom. For example, a diagram of oxygen atoms all by themselves represents an element. A compound is made up of two or more different types of atoms chemically bonded together. A diagram of water molecules (H₂O) with hydrogen and oxygen atoms bonded shows a compound.
4. A homogeneous mixture has a uniform composition throughout, like a glass of salt - water where the salt is evenly distributed. A heterogeneous mixture has a non - uniform composition, like a salad with different vegetables.
5. Flammable, burnable, rusting iron, combustible, burning toast are chemical properties (CP) as they involve chemical reactions. Density, magnetic, color, temperature, length, volume, subliming dry ice, molding clay, bending wire, breaking chalk are physical properties (PP) as they can be observed or measured without changing the substance's chemical identity.
6. The Law of Conservation of Matter states that in a chemical reaction, matter is neither created nor destroyed. The total mass of the reactants equals the total mass of the products.

Answer:

1. Chemistry is the scientific study of the properties and behavior of matter, including its composition, structure, and reactions.
2. Matter is anything that has mass and occupies space, composed of atoms and molecules.
3. For element: Draw individual atoms of the same type. For compound: Draw atoms of different types bonded together.
4. For homogeneous mixture: Draw a uniform - looking substance. For heterogeneous mixture: Draw a substance with visibly different parts.
5. Flammable: CP, burnable: CP, rusting iron: CP, density: PP, magnetic: PP, subliming dry ice: PP, color: PP, temperature: PP, molding clay: PP, length: PP, volume: PP, bending wire: PP, combustible: CP, breaking chalk: PP, burning toast: CP
6. In a chemical reaction, matter is neither created nor destroyed, and the total mass of the reactants equals the total mass of the products.