Solutions & Mixtures

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Mentos react with Diet Coke because their rough surfaces provide suitable sites for rapid growth of carbon dioxide bubbles, according to Mental Floss magazine. The bubbles’ buoyancy coupled with their rapid growth, causes them to rise to the surface, resulting in an eruption of foamy diet soda.

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  • Why Does Iodine Turn Starch Blue?

    Q: Why Does Iodine Turn Starch Blue?

    A: Starch when mixed with Iodine turns a deep shade of blue because starch contains amylose. Amylose is a soluble component of starch as well as other carbohydrates.
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  • Why Are Oil and Water Immiscible?

    Q: Why Are Oil and Water Immiscible?

    A: Water and oil do not mix because of their molecular properties. On one hand, water has a slight positive charge and is attracted to atoms and molecules with a negative charge. Oil is an electrically neutral substance and has no affinity for water. Water molecules also have high surface tension and are strongly attracted to each other. A surface-active intermediary is necessary for water and oil to mix.
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  • What Is an Acceptable Range of TDS in Drinking Water?

    Q: What Is an Acceptable Range of TDS in Drinking Water?

    A: The Environmental Protection Agency establishes a recommended range of TDS in drinking water at 500 parts per million or lower. The total dissolved solids represent the accumulated content of organic and inorganic substances contained in water.
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  • How Does Hydrogen Peroxide Kill Bacteria?

    Q: How Does Hydrogen Peroxide Kill Bacteria?

    A: Hydrogen peroxide kills bacteria by oxidizing their cell walls, stealing electrons from them and disrupting their chemical structures. Hydrogen peroxide is a compound with two hydrogen atoms and two oxygen atoms. It is very similar to water, but it has an extra oxygen atom that is shed readily to react with its environment, often in ways that are destructive to surrounding organisms.
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  • What Happens When You Mix Salt With Water?

    Q: What Happens When You Mix Salt With Water?

    A: Mixing salt with water results in the salt dissolving in the water to produce a saline solution. The salt splits up into positively and negatively charged ions that exist independently in the solution.
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  • Why Does Paint Peel Off Walls?

    Q: Why Does Paint Peel Off Walls?

    A: Peeling paint can be due to any of three common causes, including lack of surface preparation, moist walls and wrong paint, according to Red Beacon. If the wall underneath is dirty, wet or covered in old paint, the paint on top of the bad layer may not hold properly. One way to fix peeling paint is to paint the wall correctly after scraping off the malfunctioning layers.
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  • What Is Pure Water?

    Q: What Is Pure Water?

    A: The purest water that is theoretically possible would consist of nothing but H2O molecules and exclude substances like minerals and salts. This maximum is never truly achieved for large samples in practice, so the term "pure water" has taken on different meanings that vary by the water's intended use.
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  • Why Do Ionic Compounds Dissolve in Water?

    Q: Why Do Ionic Compounds Dissolve in Water?

    A: Ionic compounds dissolve in water because the hydrogen and oxygen atoms in the H2O molecules have partial charges that attract the ions in the solid compound, causing it to dissociate into separated ions. Differences in electronegativity account for the partial positive charge carried by water's hydrogen atoms and the partial negative charge of its oxygen atoms. What is happening to the ionic compound when it dissolves is a separation of its ions from their preexisting solid crystal lattice structure into unattached ions that are free to move about in the solution.
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  • What Are Examples of Concentrated Solutions?

    Q: What Are Examples of Concentrated Solutions?

    A: Common commercial examples of concentrated solutions are hydrochloric acid and sulfuric acid. Hand soap, soft drinks and liquid medicine are concentrated solutions commonly found in the household.
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  • What Are the Two Parts of a Solution?

    Q: What Are the Two Parts of a Solution?

    A: The two parts of a solution are the solvent and the solute. When the two parts combine to make a solution, the properties of the solution differ from the properties of the two individual parts.
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  • What Is the Difference Between a Mixture and a Compound?

    Q: What Is the Difference Between a Mixture and a Compound?

    A: A mixture is formed when two or more substances are physically mixed together. A compound is formed when two or more substances are chemically combined through a chemical reaction. The components of a mixture can be separated with relative ease, whereas the components of a compound are almost impossible to separate without a chemical reaction.
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  • What Is Another Name for a Homogeneous Mixture?

    Q: What Is Another Name for a Homogeneous Mixture?

    A: Another name for a homogeneous mixture is a solution. The term "solution" is more frequently used when a homogeneous mixture is a liquid, although it is sometimes used if the homogeneous mixture is a gas. Another name for a solid homogeneous mixture of metals is an alloy.
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  • What Is the Freezing Point of Gasoline?

    Q: What Is the Freezing Point of Gasoline?

    A: Gasoline may freeze at temperatures between negative 40 degrees Fahrenheitand negative 58 F. The exact freezing temperature depends on the properties of the individual constituents in gasoline.
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  • Who Invented Salt?

    Q: Who Invented Salt?

    A: Salt is naturally found in the environment, and thus it was never invented. It is composed of nitrogen and chlorine, both of which are so volatile that they combine to form a new compound.
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  • What Are Some Examples of Viscous Liquids?

    Q: What Are Some Examples of Viscous Liquids?

    A: Some examples of highly viscous liquids are oils, honey, glycerin, tar and sulfuric acid. Viscosity is the ability of substances, especially fluids, to resist flow. It can also be referred to as the measure of the ability of a liquid to resist being deformed by extensional stress.
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  • What Is an Example of a Mixture?

    Q: What Is an Example of a Mixture?

    A: Examples of mixtures include sand and sugar, alcohol and water, and flour and sugar. A mixture is a combination of two or more substances in which each substance retains its own chemical identity.
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  • What Are Examples of Solubility?

    Q: What Are Examples of Solubility?

    A: An example of solubility is the fact that sugar is very soluble in water. However, in another liquid, such as methyl alcohol, it is only somewhat soluble.
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  • What Type of Acid Is in Vinegar?

    Q: What Type of Acid Is in Vinegar?

    A: Vinegar contains acetic acid. Acetic acid is derived from alcohol, as bacteria in the air turn it from ethanol to acid, though the acid is diluted in commercial vinegar.
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  • What Does "insoluble" Mean in Science?

    Q: What Does "insoluble" Mean in Science?

    A: In science, the term "insoluble" is used to describe substances with a low solubility. Solubility is the ability for a substance to dissolve when mixed with another substance to form a new compound.
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  • How Fast Does Candy Dissolve in Water?

    Q: How Fast Does Candy Dissolve in Water?

    A: How fast candy dissolves in water depends on how much candy is used, the temperature of the water, the composition of the candy and its surface area. The duration can range from minutes to hours or even longer. Candy is composed mostly of sugar, which is very soluble in water, so although the dissolving process should not take long, an exact figure is impossible to give without knowing all variables.
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  • What Are Bricks Made Of?

    Q: What Are Bricks Made Of?

    A: Bricks are made with the two most abundant materials on Earth: clay and shale. These two materials are then put in a furnace, called a kiln, and heated to 2,000°F (approximately 1,100°C). By a chemical process (vitrification), the materials fuse together and form bricks.
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