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Note that ionic substances melt at higher temperatures than metallic substances and metals melt at higher temperatures than molecular substances?
If the question is "Why do etc." then: Ions in an ionic crystal are held together by ionic bonds aka direct electrostatic interaction, a fairly strong force. Metal atoms in a metal are held together by the metallic bond, which is weaker than an ionic bond or covalent bond but still pretty strong. Molecules in a molecular crystal are held together by covalent bonds internally, but the forces between molecules are at best relatively weak interactions (London or van der Waals type forces).
What else can I help you with?
Metallic substances have higher specific heat capacities than nonmetallic substances?
Metallic substances have higher specific heat capacities than nonmetallic substances because metallic bonds allow for more energy to be absorbed without a large increase in temperature. This means that metallic substances can store more heat energy per unit mass compared to nonmetallic substances.
Are melting points of molecular substances higher than those of ionic substance?
Ionic substances have higher melting points.
What measurement can move rapidly or slowly molecules around?
Temperature can control the speed of molecular movement. Higher temperatures lead to increased molecular motion, while lower temperatures slow down molecular movement.
Why do high temperatures have a higher absorbance than ethanol?
High temperatures can lead to increased molecular vibrations and transitions to higher energy states, resulting in higher absorbance. Ethanol, being a relatively simple molecule, may not exhibit as strong absorption characteristics compared to more complex molecules or at higher temperatures. The combination of temperature and molecular structure can affect the absorbance of a substance.
What is the relationship between molecular weight and density in a substance?
The relationship between molecular weight and density in a substance is that generally, substances with higher molecular weights tend to have higher densities. This is because heavier molecules are more tightly packed together, leading to a higher mass per unit volume, which results in a higher density.
How is temperature related to the viscosity of a liquid?
Temperature and viscosity of a liquid are inversely related; as temperature increases, viscosity decreases. This is due to increased molecular movement and reduced molecular attraction at higher temperatures, causing the liquid to flow more easily. Conversely, lower temperatures result in higher viscosity as molecular movement decreases, making the liquid more resistant to flow.
Rank the following substances from lowest to highest melting point Please note that ionic substances melt at higher temperatures than metallic substances and metals melt at higher temperatures than m?
Helium Neon Argon Chlorine Naphthalene (C10H8) Iodine Bromine Solid paraffin (C28H58) KCl Solid wax (C20H42) RbBr CsI Brass Quartz Diamond ------- Argon Solid Was (C20H42) Iodine KCI Brass
What role does molecular attraction play in determining the physical properties of substances?
Molecular attraction influences the physical properties of substances by affecting how molecules interact with each other. Stronger attractions lead to higher melting and boiling points, while weaker attractions result in lower melting and boiling points. Additionally, molecular attraction can impact the viscosity, solubility, and conductivity of substances.
What factors contribute to a substance having a higher boiling point compared to others?
The main factors that contribute to a substance having a higher boiling point compared to others are its molecular weight, intermolecular forces, and polarity. Substances with higher molecular weight and stronger intermolecular forces, such as hydrogen bonding, tend to have higher boiling points. Additionally, substances that are more polar also tend to have higher boiling points due to stronger attractions between molecules.
What is the significance of the molecular mass (symbol) in determining the properties of a substance?
The molecular mass (symbol) of a substance is significant in determining its properties because it affects how the substance interacts with other molecules. Substances with higher molecular masses tend to have different physical and chemical properties compared to substances with lower molecular masses. This is because the molecular mass influences factors such as boiling point, melting point, and solubility, which are important in understanding the behavior of a substance.
How would you find the relative melting points of a group of substance?
You can compare the relative melting points of substances by looking at their chemical structures, molecular weights, and intermolecular forces. Substances with stronger intermolecular forces (such as hydrogen bonding) typically have higher melting points compared to those with weaker forces. Experimentally, you can also perform melting point tests to directly compare the melting temperatures of the substances.
Contrast ionioc and molecular substances in terms of the types of attractive forces that govern their behavior?
Ionic substances are held together by electrostatic forces of attraction between positively and negatively charged ions, while molecular substances are held together by various types of intermolecular forces such as hydrogen bonding, dipole-dipole interactions, and London dispersion forces. Ionic substances have higher melting and boiling points due to the strong electrostatic forces, while molecular substances typically have lower melting and boiling points as the intermolecular forces are weaker.
