Question

1. circle the correct choice given below the diagrams

1)
a) a pure substance - (an element)
b) a pure substance - (a compound)
c) mixture of elements
d) mixture of compounds
e) mixture of an element and a compound
3)
a) a pure substance - (an element)
b) a pure substance - (a compound)
c) mixture of elements
d) mixture of compounds
e) mixture of an element and a compound
5)
a) a pure substance - (an element)
b) a pure substance - (a compound)
c) mixture of elements
d) mixture of compounds
e) mixture of an element and a compound
7)
a) a pure substance - (an element)
b) a pure substance - (a compound)
c) mixture of elements
d) mixture of compounds
e) mixture of an element and a compound
9)
a) a pure substance - (an element)
b) a pure substance - (a compound)
c) mixture of elements
d) mixture of compounds
e) mixture of an element and a compound
11)
a) a pure substance - (an element)
b) a pure substance - (a compound)
c) mixture of elements
d) mixture of compounds
e) mixture of an element and a compound

Explanation:

1. For 1):

• A compound is a pure substance made of two or more different - type atoms chemically combined. In the diagram for 1), all the particles are the same type of compound (same combination of atoms).

1. For 3):

• There are two types of particles: one is a compound (combination of different - type atoms) and the other is an element (same - type atoms). So it is a mixture of an element and a compound.

1. For 5):

• There are two types of compounds (different combinations of atoms). So it is a mixture of compounds.

1. For 7):

• All the particles are the same type of element (same - type atoms).

1. For 9):

• There are two types of elements (different - type atoms). So it is a mixture of elements.

1. For 11):

• All the particles are the same type of compound (same combination of atoms).

Answer:

1. B. A pure substance - (a compound)
2. E. mixture of an element and a compound
3. D. mixture of compounds
4. A. A pure substance - (an element)
5. C. mixture of elements
6. B. A pure substance - (a compound)