Answer the following question given this paragraph: The temperature at which a substance melts is called its melting point. The melting point of ice is 0C. Q: What do we call the temperature at which a substance melts? Choices: - boiling point - precipitation point - evaporation point - melting point A:
melting point
------
Answer the following question given this paragraph: Balanced chemical reactions are balanced in terms of moles. Q: Balanced chemical reactions are balanced in what? Choices: - atoms - molecular bonds - electrical charge - terms of moles A:
terms of moles
------
Answer the following question given this paragraph: Solutions We have previously defined solutions as homogeneous mixtures, meaning that the composition of the mixture (and therefore its properties) is uniform throughout its entire volume. Solutions occur frequently in nature and have also been implemented in many forms of manmade technology. We will explore a more thorough treatment of solution properties in the chapter on solutions and colloids, but here we will introduce some of the basic properties of solutions. The relative amount of a given solution component is known as its concentration. Often, though not always, a solution contains one component with a concentration that is significantly greater than that of all other components. This component is called the solvent and may be viewed as the medium in which the other components are dispersed, or dissolved. Solutions in which water is the solvent are, of course, very common on our planet. A solution in which water is the solvent is called an aqueous solution. A solute is a component of a solution that is typically present at a much lower concentration than the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration). Concentrations may be quantitatively assessed using a wide variety of measurement units, each convenient for particular applications. Molarity (M) is a useful concentration unit for many applications in chemistry. Molarity is defined as the number of moles of solute in exactly 1 liter (1 L) of the solution: M = mol solute L solution. Q: What term is used to describe a solution in which water is the solvent? Choices: - liquids solution - hydro solution - sediment solution - aqueous solution A:
aqueous solution
------
Answer the following question given this paragraph: Sublimation occurs when ice and snow change directly to water vapor. This also happens because of heat from the sun. Q: When does sublimation occur? Choices: - when the wind changes direction - when the snow melts the ice caps - when the ice and sand change directly into water vapors - when the ice and snow change directly into water vapors A:
when the ice and snow change directly into water vapors
------