Identification of Elements, Compounds and Mixtures

A white coloured powder which is only partially soluble in water. It conducts electricity but only when dissolved in water. When strongly heated, two types of coloured residues are produced.​ The substance is a/an​ ​ ​

​ ​ (a)  

• mixture
• element
• compound

A grey coloured powder which is insoluble in water. It conducts electricity in the solid state. When heated, the powder remains grey. The substance is a/an ​ (a)   ​ ​ ​

• element
• compound
• mixture

A colourless liquid which mixes well with water. It does not conduct electricity. When heated strongly, it forms carbon dioxide and water only. The substance is a/an ​ (a)   ​ ​ ​

• compound
• mixture
• element

A green solid which forms a black residue when heated. The substance is a/an ​ (a)   ​ ​ ​

• compound
• mixture
• element

A blue solution which can be crystallised. The substance is a/an ​ (a)   ​ ​ ​

• mixture
• element
• compound

A gas which dissolves in water to form sulfuric acid. The substance is a/an ​​ (a)  

• compound
• element
• mixture

A green liquid which can be separated into three pigments by chromatography. The substance is a/an ​​ (a)  

• mixture
• element
• compound

A blue liquid which produces a colourless distillate upon distillation. The substance is a/an ​​ (a)  

• mixture
• element
• compound

A monatomic gas with a boiling point of −269 °C. The substance is a/an ​​ (a)  

• element
• compound
• mixture

It melts at 1538 °C and is unable to decompose into any simpler substances. The substance is a/an ​​ (a)  

• element
• compound
• mixture