Compounds with high melting points have _____.
covalent bonds
metallic bonds
ionic bonds
no chemical bonds
4. Which of the following is NOT a characteristic of minerals?
crystalline structure
formed by inorganic processes
definite chemical composition
either liquid or solid
To determine the compounds with high melting points, we need to consider the type of bonds present in these compounds. Compounds with high melting points typically have strong bonds that require a significant amount of energy to break and convert the solid compound into a liquid or gas.
Among the given options, only ionic bonds are known for their high melting points. Ionic bonds are formed between positively and negatively charged ions. These bonds are relatively strong due to the attraction between opposite charges, resulting in a strong lattice structure. As a result, compounds with ionic bonds tend to have high melting points.
Therefore, the correct choice is:
- Compounds with high melting points have ionic bonds.
Moving on to the next question:
To identify the characteristic(s) of minerals, we can consider the properties that define minerals. Minerals are naturally occurring, inorganic substances with specific structural and chemical properties.
Let's analyze the given options:
1. Crystalline structure: Minerals typically have a characteristic internal arrangement of atoms, forming a regular and repeating pattern known as a crystal lattice. This option aligns with the definition of minerals.
2. Formed by inorganic processes: Minerals are formed through geological processes, such as crystallization from magma or precipitation from water solutions. This option is also consistent with the definition.
3. Definite chemical composition: Minerals have a specific chemical formula or composition, consisting of elements in fixed proportions. This option is in line with the characteristics of minerals.
4. Either liquid or solid: Minerals are solid materials. Liquids do not qualify as minerals.
From the given options:
- Either liquid or solid is NOT a characteristic of minerals.
Therefore, the correct choice is:
- Either liquid or solid.