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- The composition of a mixture is variable.
- Each of its components retains its characteristic properties.
- Its components are easily separated.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoThe three mixtures are: Solutions, Suspensions and Colloids.
Wiki User
∙ 6y agoA fruit salad is a nonhomogeneous mixture containing solids and liquids.
Wiki User
∙ 6y agoThese are: number of phases, homogeneity or nonhomogeneity, number of components.
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∙ 11y agojemaima
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A pure radioactive substance has a half-life of 3 hours. How long would it take a mass of 12g of that substance to decay to 3g?
Twice the half-life.
What are examples for substance?
A substance can any material, solution, or mixture, such as water, salt, glue, or gunpowder.A pure substance is one that contains the same element or compound throughout. Salt is a pure substance, but when added to water, it becomes a mixture. Gunpowder is basically a mixture of three pure substances (compounds).
What are the six characteristics of a chemical change?
1. evolution of a gas 2. change in colour of the substance 3. change in temperature of the substance 4. formation of precipitate
Explain how matter can be classified into mixtures pure substances compounds and elements?
Matter is broken down into two main parts: mixtures and pure substances. A pure substance is something that is consistent throughout. This means that in this substance all the atoms or molecules are the same. Elements are a sub-unit of pure substances. All the atoms in elements are identical. They can be paired up to form molecules however the atoms must be the same. Ex. Hydrogen (H2), Nickel (Ni), Iron (Fe) are all elements, and thus would also be pure substances. Compounds are also a sub-unit of pure substances. A compound is made up of one type of molecule and the molecule is made up of different types of atoms. Salt (NaCl) is a compound, as is Water (H2O). Mixtures are collections of more than one type of molecule and/or atom. This can include solutions, such as salt water, suspensions which tend to be cloudy, and mechanical mixtures, such as raisin bran where the parts are readily visible and can be separated. Matter is broken down into two main parts: mixtures and pure substances. A pure substance is something that is consistent throughout. This means that in this substance all the atoms or molecules are the same. Elements are a sub-unit of pure substances. All the atoms in elements are identical. They can be paired up to form molecules however the atoms must be the same. Ex. Hydrogen (H2), Nickel (Ni), Iron (Fe) are all elements, and thus would also be pure substances. Compounds are also a sub-unit of pure substances. A compound is made up of one type of molecule and the molecule is made up of different types of atoms. Salt (NaCl) is a compound, as is Water (H2O). Mixtures are collections of more than one type of molecule and/or atom. This can include solutions, such as salt water, suspensions which tend to be cloudy, and mechanical mixtures, such as raisin bran where the parts are readily visible and can be separated. Ans. Various points of distinction between a chemical compound and a mixture are summarized below: Characteristics Pure substance or compound Mixture 1. Composition The elements in a compound are present in definite proportion by weight. The ingredients of a mixture may be present in varying ratio. 2.Homogeneity A compound is always homogeneous. A mixture may be homogeneous (solution) or heterogeneous. 3. Properties A compound has entirely different properties from those of its constituents. Properties of a mixture are of the properties of its constituents. 4. Separation The constituents of a compound cannot be separated by simple separation techniques. The constituents of. a mixture can be separated by simple methods. 5. Energy changes Energy in the form of heat, light or elec­tricity is either evolved or absorbed when a compound is formed. There is generally no energy change when a mixture is formed from its constituents. 6. Volume change At constant temperature and pressure, formation of a compound may involve either no change or large change in volume. At constant temperature and pressure, formation of a mixture involves either very little or no change in volume.
Would it be possible for two pure substances to have exactly the same set of properties?
Not if they are solid substances (ie one is not hollow in the middle). That was how Archamedies worked out how to prove the gold crown was pure gold. The density of every substance (mass per unit volume) is unique. * * * * * Not so sure about the density of EVERY substance being different. Every PURE substance: probably yeas. But every substance? For example, the density of steel can be varied from 7.75 gcm-3 to 8.05 gcm-3, by varying the proportion of the other materials in the alloy. Presumably there are some other substances with a density in that range.
Is ammonia a mixture or pure substance in chemistry?
Ammonia is pure substance. It is a molecule with formula NH(3).
What is the differences between a mixture and a pure substance?
1. A mixture contain two or more substances. 2. A mixture can be separated in components by physical procedures.
Is hot chocolate is pure substance or mixture substance?
The original hot chocolate was not a mixture, but they turned it into one because it was more convenient and easy to make for people. Xweetox girl 3/31/09
What is the difference between pure substance and mechanical mixture and solutions?
1. A pure substance can not be separated farther since it is composed of one type of atom. 2. I can't define mechanical mixture... Check your text book 3. A solution is one or more substances. I can: As she said a pure substance has only one type of particle. A solution is MORE then one substance. But in a solution u can't see the different parts. In a mechanical mixture, there is more then one particle like in a solution, but u can see the different particles.
Which is a pure substance salt water duct tape baking soda or orange juice?
A pure substance is a sample of matter with both definite and constant composition with distinct chemical properties. Examples: water, diamond, gold, table salt (sodium chloride), ethanol Salt water is not a pure substance because it is a mixture of two compounds, NaCl and H2O. Orange juice again is a mixture of sugar, water and orange pulp. So it is not a pure substance. Duct tape is made of three layers: Layer 1: A Resilient Plastic Layer 2: A Fabric Mesh Layer 3: Rubber Based Adhesive So it is certainly not a pure substance. Baking soda, on the other hand, is a pure substance because it is a compound (NaHCO3) and all compounds and elements are considered pure substances.
Give 3 example of pure mixture?
A conglomerate rock, salad, and chicken soup are a few examples.
Is hydrogen peroxide a mixture or a pure substance?
H2O2 is a covalent compound, as a pure sample of it cannot be split into other separate compounds by physical means. However, the bottle labeled "Hydrogen Peroxide" in your medicine cabinet is actually a mixture (it's about a 3% solution of hydrogen peroxide the compound in water).
What an example of a pure substance?
The purest substance you are likely to see is 24 karat gold, not only is it pure gold but gold is naturally isotopically pure (gold-197), not a mixture of several isotopes of the element. The purest substance that you possess is the silicon inside the semiconductor chips in your electronic devices, although deliberately mixed with small amounts of other elements to create the transistors, resistors, and other circuit components in the chip these impurities mixed in are at a parts per billion level (much lower than residual impurities left in pure 24 karat gold). However silicon is a mixture of 3 isotopes: silicon-28 (92%), silicon-29 (5%), and silicon-30 (3%). Oh well, nothing is really a perfectly pure substance.Any substance that consists of a single element or chemical compound is a pure substance. These would include hydrogen, methane, gold, salt, sugar, or carbon dioxide. Saltwater, air, and bronze (an alloy) are not pure substances, as their constituent compounds could be present in many different amounts in any given sample.
Is ammonia pure?
Ammonia is a compound and so can exist as a pure substance. Household ammonia is not pure. It is a 3% ammonia solution. The other 97% is water. Pure ammonia is very dangerous.
What are a mixture and a compound?
make a cake and find outor the real answer:COMPOUND1. It is a pure substance.2. It can not be separated by physical method.3. Element loose their properties in a compound.4. Its composition is fixed through out its mass.5. It has fixed melting point.MIXTURE1. It is an impure substance.2. It can be separate by physical method.3. Substances forming mixture retain their properties.4. It has no fixed composition.5. It has no sharp melting point.This guiy is a liar!
Tell you 3 things that are true of all mixtures?
Mixtures consist of more than one type of pure substance. Therefore, mixtures have different kinds of particles present. The particles can be either molecules, atoms or ions.Mixtures can have different proportions of substances present. The mixture can have different 'recipes' or colors.Mixtures do not have a definite boiling point, bp. The bp will change as the mixture continues to boil. Compared to a pure substance where the boiling point has a particular temperature and the temperature stays the same as it boilsMixtures do not have a definite freezing or melting point, mp. The mp will change as the mixture starts to melt whereas a pure substance will stay the same temperature until it has all melted.Mixtures can be separated into substances that have different properties from the mixture. Whereas a pure substance can not be separated although if enough energy is applied it can decompose into its constituent elements.Mixtures do not have a chemical formula whereas a pure substance does.Examples of mixtures: glass, sea water, milk, fruit juice, brass, paint, most of the water that lies around, steel (metal mixtures are called alloys), soap, most of the stuff around usExamples of pure substances: water, H2O; table salt, NaCl; sugar, C12H22O11; plastic food wrap if it is not colored, (C2H2)n repeating units; petrol/gasoline/octane, C8H18, although the petrol that we buy is a mixture of coloring agents, smelling agents and other hydrocarbons.
Is confectioners sugar pure icing or icing sugar mixture?
Confectioner's sugar is icing sugar mixture (pure icing sugar with a small amount (about 3%) of starch added as an anti-caking agent). Pure icing sugar is very fine powdered refined sugar with no added starch.
