Question: How Can You Say That One Substance Is Different From One Another?

How can you identify an unknown substance?

Identifying Unknown SubstancesAppearance – use a magnifying glass to describe the appearance of the powder.Texture – feel the substance by pinching some between your fingers.Smell – carefully – without inhaling any – smell the substance.More items….

Can two substances have the same density?

Can two substances have the same density? So Pure materials ,they can not have same densities. (Assuming they are not isotopes of each other.) But mixtures, compounds or different phases can have same densities.

Is eggs a pure substance?

An egg is neither a pure substance nor a mixture. … It is definitely a mixture. Egg yolk is a mixture of nutrients provided to the egg for development. It is definitely a mixture.

What is the difference between a physical and chemical change?

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed. The distinction between physical and chemical change is not clear cut.

Why is it important to identify unknown substances?

Detecting known substances, and determining their quantity, is also important. … In manufacturing, it is important to detect any impurities in the product and to determine whether they are present in a significant amount. Analytical characterization is critical in pharmaceutical products, for instance.

How can you identify an unknown salt?

Students identify unknown chloride salts by (1) using a precipitation reaction to determine if the cation is a group 1 or group 2 metal, (2) performing a titration with silver nitrate to determine the formula mass of the salt, and (3) confirming the identity of the salt using a flame test.

How can you identify matter?

Some examples include:color.texture.boiling point.melting point.freezing point.density.taste.smell.More items…•

What are four examples of properties?

Some examples of physical properties are:color (intensive)density (intensive)volume (extensive)mass (extensive)boiling point (intensive): the temperature at which a substance boils.melting point (intensive): the temperature at which a substance melts.

Is Sour Taste a physical property?

A change in size or shape is a physical change. 16. A chemical change means a new substance with new properties was formed. … When milk turns sour, this is a physical change because a change in odor does not indicate a chemical change.

How can we say that one substance is different from other?

Melting or boiling point is another property that scientists can use to identify a substance. Melting point is the temperature at which a substance changes from solid → liquid. … Then, you could compare their melting point to a chart of known melting points to determine their identity.

How can physical and chemical properties help you distinguish one substance from another?

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.

What are the two types of substances?

The two main types of pure substances are compounds and elements. They consist of a single type of particle or compound.

How do you tell if a substance is a mixture?

A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded. A heterogeneous mixture is a mixture of two or more chemical substances where the various components can be visually distinguished.

How can we identify a substance?

Typically, the identity of a substance can be described by a:chemical name, for example, benzene;number, for example, EC number 200-753-7, and.chemical composition, for example, >99 % benzene and <1 % toluene. the composition is determined by chemical analysis.

What is the unknown substance?

The purpose of this experiment is to identify an unknown substance chosen from the attached list. The procedure you will use is to determine several of its physical properties and chemical reactions and compare these to samples of known substances.

What are 2 pure substances?

Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate). Crystals, in general, are pure substances. Tin, sulfur, and diamond are examples of pure substances that are chemical elements.

What are 2 examples of pure substances?

The best examples of pure substances are pure elements, molecules, and compounds:Hydrogen gas.Gold metal.Sugar (sucrose)Baking soda (sodium bicarbonate)Ammonia.Diamond.Copper wire.Silicon chip.More items…•

What are the physical and chemical properties of matter give examples?

A physical property is a characteristic of matter that is not associated with a change in its chemical composition. Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity.