Table of Contents
What is it called when a substance is not pure?
Pure and impure chemical substances A pure element or compound contains only one substance, with no other substances mixed in. Impure materials may be mixtures of elements, mixtures of compounds, or mixtures of elements and compounds.
What is substance and not substance?
A substance is matter which has a specific composition and specific properties. Every pure element is a substance. Methane is a compound and hence is also a substance. Examples of non-substances: Salt water is not a substance. It is a mixture of two substances – sodium chloride and water.
What are unchangeable substances called?
Additional Concepts. Matter that has a uniform and unchanging composition is called a substance, also known as a pure substance.
What is an impurity in chemistry?
In chemistry, the expression “impurity” refers to a chemical substance inside a confined chemical phase which differs from the chemical composition of that phase [13].
Which of the following is not an element?
Answer: (3)silica Graphite is a carbon element. Silicon(Si) and germanium(Ge) are also elements, but silica (SiO2) is not an element.
What are not substances?
Mixtures. A mixture is a mix or solution of two or more substances. Under the EU chemicals legislation, mixtures are not considered substances. When chemical compounds A and B are put together and do not react, this is not a substance but a mixture.
Which one of the following is not a substance?
Answer: air, Explanation: air has no substances , so the air is the answer for this question .
What term refers to a mixture that does not have a uniform composition and in which the individual substances remain distinct *?
Chapter 3 Vocabulary
| A | B |
|---|---|
| Heterogeneous mixture | A mixture that does not have a uniform composition and in which the individual substances remain distinct |
| Homogeneous mixture | A mixture that has a uniform composition throughout |
| Solution | Another name for a homogeneous mixture |
Which of the following is not a characteristic of pure substances?
the characteristics which does not represent a pure substance is that they are made up of different types of particles. Explanation: pure substances include elements and compounds. They have same boiling and melting point.
What is pharmaceutical impurity?
Pharmaceutical impurities are the unwanted chemicals that remain with active. pharmaceutical ingredients (APIs) or drug product formulations. The impurities. observed in drug substances may arise during synthesis, or may be derived from.