Element, Compound and Mixture

What is element

• It is a pure substance that contain only 1 type of atom

• It is a substance that is made up of two or more different elements that are chemically combined

• It is a new substance formed from chemical reaction

• It is a substance that is made from two or more different substances that are made by physical reaction.

Answer explanation

Element only made from one type of atom.

Compound is a substance made from chemical reaction between two or more different types of elements.

Mixture is a substance made from mixing different substances together and can be separated by physical methods

Which of the following is a compound?

• 
• 
• 
• 

Answer explanation

Compound is when two or more different elements combine together chemically

Which of the following is a correct statement about mixture

• cannot be broken down into simpler substances

• can be broken down by physical method

• can be broken down by chemical method

• mixture has different characteristics than its constituents (bahan awal/ ingredients)

Answer explanation

mixture

- can be broken down by physical methods (will learn in chapter 4 Water)

- have the same characteristics as its constituents

- the amount of constituents t make the mixture can be varied

Which statement is not true about compound

• made by chemical reaction

• amount of constituents needed to make the compound is fixed

• compound has different characteristics than its constituents

• can be separated using physical methods

Answer explanation

compound

- made by chemical reaction

- made from two or more different types of element

- can be separated by chemical reaction (eg. electrolysis)

- amount of constituents (bahan awal/ ingredient) are fixed

Example: to make water, you need 2 hydrogen atoms and 1 oxygen atom ONLY.

Jangan lebih, jangan kurang!

which of the following is true about metal elements?

• shiny

• brittle

• non-malleable

• low density

Answer explanation

Metal elements are.......

1. shiny

2. Malleable (can be hammered without breaking)

3. Ductile (can be made into wire)

4. High density

5. Good conductor of heat

6. Good conductor of electricity

Which of the following is not correct about non-metal elements?

• High density

• Brittle

• Poor conductor of electricity

• dull

Answer explanation

Coal shown in the picture is made from carbon atom (non-metal).

Non-metals are....

1. Dull

2. Brittle (easy to break)

3. Non-ductile (cannot be made into wires)

4. Poor conductor of heat

5. Poor conductor of electricity

6. Low density

What is this?

• Element

• Compound

• Mixture

Answer explanation

It is element because it is made from one type of atom only

What is this

• Element

• Compound

• Mixture

Answer explanation

This is a mixture of compound. you can see that there are two different types of compound in this mixture.

What is this?

• Element

• Compound

• Mixture

Answer explanation

This is a compound because....

there is only 1 type of compound

AND

The compound is made from two different types of element that are combined together

What is this?

• Element

• Compound

• Mixture

Answer explanation

This is a mixture of two different elements and 1 type of compound