ormulae
Differentiate between the following.
a. Pure substance and mixture
b. Elements and compounds
c. Homogeneous mixtures and
heterogeneous mixtures
d. Distillation and fractional distillation
e. Compounds and mixtures
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Answers
pure substance and mixture
Substances which have a specific composition and cannot be separated into any constituents are called pure substances. ...
Pure substances are further divided into elements and compounds. The combination of two or more pure substances is called a mixture.
elements and compounds
Elements and compounds are pure chemical substances found in nature. The difference between an element and a compound is that an element is a substance made of same type of atoms, whereas a compound is made of different elements in definite proportions. Examples of elements include iron, copper, hydrogen and oxygen. Examples of compounds include water (H2O) and salt (Sodium Chloride - NaCl)
homogeneous and heterogeneous mixtures
A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions.
A heterogeneous mixture consists of visibly different substances or phases. The three phases or states of matter are gas, liquid, and solid
distillation and fictional distillation
Simple distillation is the method used to separate substances in mixtures with significantly different boiling points, while fractional distillation is used for mixtures containing chemicals with boiling points close to each other.
compounds and mixtures
Compound are substances which can be formed by chemically combining two or more elements.
Mixtures are substances that are formed by physically mixing two or more substances.
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