Solutions & Mixtures

A:

According to Mental Floss, the luminescence inside glow sticks comes from a chemical reaction between two substances that releases energy as light. The exact chemical makeup of a glow stick can vary from manufacturer to manufacturer, but most use hydrogen peroxide and a chemical called a diphenyl oxalate ester. When the two liquids mix inside the glow stick, they produce a light colored by a phosphorescent dye.

See Full Answer
Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • What happens when you mix bleach and ammonia?

    Q: What happens when you mix bleach and ammonia?

    A: Mixing bleach and ammonia produces toxic gases called chloramines that can damage the upper respiratory tract and irritate the eyes, throat and nose. Symptoms include coughing, shortness of breath, watery eyes and nausea. Prolonged exposure to chloramines in an enclosed space can cause death, particularly if a person has any pre-existing respiratory conditions.
    See Full Answer
    Filed Under:
  • How do glow sticks work?

    Q: How do glow sticks work?

    A: According to Mental Floss, the luminescence inside glow sticks comes from a chemical reaction between two substances that releases energy as light. The exact chemical makeup of a glow stick can vary from manufacturer to manufacturer, but most use hydrogen peroxide and a chemical called a diphenyl oxalate ester. When the two liquids mix inside the glow stick, they produce a light colored by a phosphorescent dye.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • How do you identify heterogeneous and homogeneous mixtures?

    Q: How do you identify heterogeneous and homogeneous mixtures?

    A: Heterogeneous and homogeneous mixtures are identified by the level at which the mixtures blend together. Visible indications of different components within a mixture denote a heterogeneous mixture, while a uniform, single-component appearance indicates a homogeneous mixture.
    See Full Answer
    Filed Under:
  • What types of metals do magnets stick to?

    Q: What types of metals do magnets stick to?

    A: Magnets stick to any metal that contains iron, cobalt or nickel. Iron is found in steel, so steel attracts a magnet and sticks to it. Stainless steel, however, does not attract a magnet.
    See Full Answer
    Filed Under:
  • What is the difference between unsaturated, saturated and supersaturated solutions?

    Q: What is the difference between unsaturated, saturated and supersaturated solutions?

    A: An unsaturated solution contains less than the maximum soluble material, while a saturated solution contains all of the material that it is able to dissolve in its current state, with excess material remaining undissolved. A supersaturated solution holds more of the solvent than it would be able to under normal circumstances.
    See Full Answer
    Filed Under:
  • What does "solute" mean in science?

    Q: What does "solute" mean in science?

    A: A solute is the smaller part of a solution, which in many cases is said to have been dissolved by the solvent. A solution is any mixture that is homogeneous at a molecular level, which means that any given volume of the solution has about the same proportion of type of molecule in the overall solution as the overall solution.
    See Full Answer
    Filed Under:
  • How do you separate alcohol and water?

    Q: How do you separate alcohol and water?

    A: To separate alcohol from water, you must heat the solution, evaporate the ethanol into vapor, cool it down and condense it back into a liquid using a distillation apparatus. This process is called distillation, and it is used to separate a pure liquid from a liquid mixture. Distillation works for liquids that have different boiling points.
    See Full Answer
    Filed Under:
  • How does filtration work?

    Q: How does filtration work?

    A: Filtration is a method of separating solid impurities from liquid by allowing the liquid to pass through a filter, which usually consists in a porous material such as cotton wool, cloth, paper, glass wool or asbestos. The filter traps solid particles, and the size of its pores or holes determines which particles pass through. Water flows through the material at a low speed.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • What is the difference between a solution and a suspension?

    Q: What is the difference between a solution and a suspension?

    A: A solution is a mixture featuring solutes that have been dissolved, while a suspension is a mixture of liquids also containing solid particles that may not completely dissolve inside the liquid. Materials that dissolve in liquids are considered soluble. When no more solute dissolves in a particular solvent while temperature remains the same, the solution is considered to be saturated.
    See Full Answer
    Filed Under:
  • Why does iodine sublime rather than melt and boil?

    Q: Why does iodine sublime rather than melt and boil?

    A: When iodine is heated, the intermolecular bonds are broken and the iodine goes directly to vapor from solid crystalline form. This is because the bonds are too weak to sustain liquid form under those conditions (slightly above room temperature and standard atmospheric pressure). If you were to continue heating the iodine, it would eventually melt at 113.6 degrees Celsius, and it would boil at 185 degrees C.
    See Full Answer
    Filed Under:
  • What is a dehydrating agent?

    Q: What is a dehydrating agent?

    A: A dehydrating agent is a substance that dries or removes water from a material. In chemical reactions where dehydration occurs, the reacting molecule loses a molecule of water. Sulfuric acid, concentrated phosphoric acid, hot aluminum oxide, and hot ceramic are common dehydrating agents in these types of chemical reactions.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under: