3.4 Salts

• Scheikunde
• Middelbare school
• vwo
• Leerjaar 3

Salts

Paragraph 3.4

Learning goals

At the end of the lesson you can:

• state the properties of salts.
• derive the chemical formula of a salt from the name.

Properties of salt

• Consist of metal and non-metal atoms
• Conduct electricity in the liquid state and when dissolved in water
• They are brittle in the solid state
• Their melting points are high

Determine empirical formula:

1. Write down the name of the salt
2. Write down the ions with charge
3. Determine the ratio, the total charge has to be zero
4. Write down the emperical formula of the salt without charges

Example:

1. magnesiumchloride
2.       Mg2+       Cl-                                          
3.          1       :        2     (1x2+) + (2x1-) = 0        
4. Mg Cl 2

What is a salt?

1. A compound of a metal and a non-metal
2. A compound of two metals
3. A compound of two non-metals

What is the empirical formula of sodiumchloride ?

1. 2NaCl
2. Na​2​​Cl
3. NaCl​2​​
4. NaCl

What is the empirical formula of potassiumoxide?

1. K​2​​O​2​​
2. K​2​​O
3. KO​2​​
4. KO

Making exercises

Make 45+48 (15 min in silence)

Finished? Make 41a, 42, 49a,c, 50, 51a, 52a,b,c, 53a,c,d,e,f

Making exercises

Make 49a,c+50 (10 min in silence)

Finished? Make 41a, 42, 51a, 52a,b,c, 53a,c,d,e,f

Reflection

At the end of the lesson you can:

• state the properties of salts.
• derive the chemical formula of a salt from the name.