Yr6 - S2 - Changes of Matter and Properties of Materials

Question 1

What is production of odour? Give example.

Answer 1

Its when a chemical change produces a new smell. For example when a egg is rotting (that’s a chemical change) it produces a smell/odour.

Question 2

What is change in temperature? Give example.

Answer 2

In some chemical reactions they release thermal energy and this is what we measure as temperature changes. For example when you burn coal it changes in temperature.

Question 3

What is a change in colour? Give example.

Answer 3

A change in colour is often an indication of a chemical change. For example a fruit changes colour when it ripens.

Question 4

What does it mean when a chemical change creates a formations of bubbles? Give example.

Answer 4

The formation of gas bubbles is a indicator that a chemical change has occurred. For example when a antacid tablet is dropped into water.

Question 5

When a chemical change occurs what does it means when a formation of solid appears. Give example.

Answer 5

When two liquids are combined, a solid called a precipitate can form. For example the shells of animals such a clams and mussels are precipitates. They are the result of a chemical change involving substances in seawater combining in substances/chemicals from the creatures.

Question 6

What is an element? Give example.

Answer 6

A unique type of matter elements are pure substances of one type of atoms that cant be broken down into smaller atoms. For example hydrogen, oxygen, lithium, beryllium and nitrogen.

Question 7

What is an atom? Give example.

Answer 7

Atoms are the smallest unit of ordinary matter. Atoms have the properties of chemical elements. For example Helium (He) that is a type of atom.

Question 8

What is an molecule? Give example.

Answer 8

A group of atoms that have bonded together. for example H2O the water molecule that is made up of Two hydrogen atoms and one oxygen atom.

Question 9

When a physical changes occur do molecules stay the same?

Answer 9

YES

Question 10

In chemical changes do molecules stay the same?

Answer 10

NO

Question 11

Melting an ice cube. Reversible/Irreversible

Answer 11

Reversible

Question 12

Frying an egg. Reversible/Irreversible

Answer 12

Irreversible

Question 13

dissolving salt in water. Reversible/Irreversible

Answer 13

Reversible

Question 14

What is a physical change?

Answer 14

Physical changes are usually about physical states of matter. Physical changes can change the form of the substance but not its molecular bonds.

Question 15

What is a chemical change?

Answer 15

Chemical changes happen when atomic bonds (The bond that atoms create to create molecules) are broken, created or changed during a chemical reaction.

Question 16

Give an example of a physical change and chemical change and explain.

Answer 16

Melting a sugar cube is a physical change because the substance is still sugar. Burning a sugar cube is a chemical change. Fire activates a chemical reaction between sugar and oxygen. The oxygen in the air reacts with the sugar and the chemical bonds are broken.

Question 17

What are five physical properties?

Answer 17

Color, shape, mass, volume and temperature are all physical properties.