(Q).
Answer the following question given this paragraph: Earth is the only planet in the solar system that has water in all three states. Q: Earth is the only planet in the solar system that has what element, which is essential for human life, present in all three of its states? Choices: - helium - oxygen - carbon - water A:
(A).
water

(Q).
Answer the following question given this paragraph: Magnetism is the ability of a material to be attracted by a magnet and to act as a magnet. No doubt you've handled refrigerator magnets like the ones in Figure below . You probably know first-hand that they stick to a metal refrigerator but not to surfaces such as wooden doors and glass windows. Wood and glass aren't attracted to a magnet, whereas the steel refrigerator is. Obviously, only certain materials respond to magnetic force. Q: Unlike wood and glass, steel is an example of a material that responds to what force? Choices: - kinetic - electromagnetic - thermal - magnetic A:
(A).
magnetic

(Q).
Answer the following question given this paragraph: The physical state and properties of a particular compound depend in large part on the type of chemical bonding it displays. Molecular compounds , sometimes called covalent compounds, display a wide range of physical properties due to the different types of intermolecular attractions such as different kinds of polar interactions. The melting and boiling points of molecular compounds are generally quite low compared to those of ionic compounds . This is because the energy required to disrupt the intermolecular forces between molecules is far less than the energy required to break the ionic bonds in a crystalline ionic compound. Since molecular compounds are composed of neutral molecules, their electrical conductivity is generally quite poor, whether in the solid or liquid state. Ionic compounds do not conduct electricity in the solid state because of their rigid structure, but conduct well when either molten or dissolved into a solution. The water solubility of molecular compounds is variable and depends primarily on the type of intermolecular forces involved. Substances that exhibit hydrogen bonding or dipole-dipole forces are generally water soluble, whereas those that exhibit only London dispersion forces are generally insoluble. Most, but not all, ionic compounds are quite soluble in water. Table below summarizes some of the differences between ionic and molecular compounds. Q: What is another name for molecular compounds? Choices: - phenotype compounds - oxidized compounds - synthetic compounds - covalent compounds A:
(A).
covalent compounds