1.Purity of a solid substance can be checked by its: a)Boiling point b)Melting point c)Solubility in water d)Solubility in alcohol 2. Compounds: a)Are the same as mixtures b)Can be separated by their physical properties c)Contain only type of element d)Are different kinds of atoms chemically combined with each other 3. What are pure substances? 4. .An element is made up of only one kind of _________. 5. .A mixture contains more than ______ substance mixed in ______ proportion. 6. State any one difference between pure and impure substances. 7. Define an element and a compound 8. What are pure substances?
Answers
Answer:
1. b) Melting point
2. d) are of different kinds of atoms chemically combined with each other
3. Pure substances are defined as substances that are made of only one type of atom or only one type of molecule
4. atom
5. A mixture contains more than two substance mixed in fixed proportion.
6. 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.
7. An element is a substance that cannot be broken down into a simpler format. When two or more elements chemically combine in a fixed ratio by mass, the obtained product is known as a compound
8. Pure substances are defined as substances that are made of only one type of atom or only one type of molecule