NATURAL SCIENCES TEST for CORECONCEPTS 1 &2. 2º.ESO.
(Atoms. How are atoms organised in matter?. Mixtures and pure substances).
1º.- Explain how atoms are made up.
2º.- Explain the difference particles that form part of atoms and how they are arranged inside the
3º.- Explain why atoms are usually electrically neutral.
4º.- Explain how ionisation takes place.
5º.- Explain how cations and anions are formed.
6º.- Explain the difference between a simple substance (element) and a compound.
7º.- Explain the difference between molecules and ionic crystals.
8º.- What is a mixture?. Give some examples.
9º.- What is a pure substance?. Give some examples.
10º.- Explain the difference between mixtures and pure substances.
11º.- Explain the difference between heterogeneous and homogeneous mixtures.
12º.- What is a solution?. Give some examples.
13º.- What are physical changes?.
14º.- What are chemical changes?.
15º.- Explain the components in a solution.
16º.- Explain the types of solution according to the amount of its components.
17º.- Which are the separation techniques for mixtures?.
18º.- Explain decanting. When is this technique used?.
19º.- Explain filtration. When is this technique used?.
20º.- Explain magnetic attraction. When is this technique used?.
21º.- Explain sifting. When is this technique used?.
22º.- Explain precipitation. When is this technique used?.
23º.- Explain crystallisation. When is this technique used?.
24º.- Explain distillation. When is this technique used?.
25º.- Explain how pure substances are differentiated. Give some examples.
26º.- Explain the melting point for the pure substances.
27º.- Explain the boiling point for the pure substances.
28º.- Explain the density for the pure substances.
29º.- Explain the primordial elements making up the universe.