Question: Why Can You Use Density To Identify A Substance?

What procedures would you do if you wanted to calculate the density of an unknown substance?

To measure the density of an unknown material, you will need to find the mass and the volume.

The mass can be found by using an electronic scale or spring balance.

The volume can be measured by approximating the dimensions of an object, but a more reliable method is by using water displacement..

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

Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule.

Can two substances have the same density?

As a result, you can conveniently compare the density of an unknown substance with the densities of known substances. Finding any matching densities will give you information about the possible identity of the unknown substance. However, it is possible for two different substances to have the same density.

How can you identify matter?

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

Is density intensive or extensive?

The ratio of two extensive properties of the same object or system is an intensive property. For example, the ratio of an object’s mass and volume, which are two extensive properties, is density, which is an intensive property.

How can density be used to identify a substance?

You can identify an unknown substance by measuring its density and comparing your result to a list of known densities. Density = mass/volume. Assume that you have to identify an unknown metal. You can determine the mass of the metal on a scale.

Is density alone sufficient to identify a substance?

We can use density to help identify a substance, but density alone is not enough for a positive identification of its composition. Just as many individuals share the same birth date, many different substances have the same density.

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 do you identify pure substances?

Color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.

What are four examples of properties?

physical and chemical properties. Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density.

Is density proportional to the amount of a substance?

Note that density is directly proportional to the mass (or weight) and indirectly proportional to the volume: If volume stays the same as mass increases, the density will increase by the same factor. If volume stays the same as mass decreases, the density will decrease by the same factor.

How do we identify different substances?

Determination of chemical properties results in the change of the identity of the substance. Some properties, such as solubility, melting point, boiling point, and density are independent of the amount of substance being examined. These properties are known as intensive properties and are used to identify a substance.

What can be used to identify an unknown substance?

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.