Holiday Homework: Changes in Matter-What Cause Them?

Which of the following illustrations shows the arrangement of molecules of liquid?

• 
• 
• 
• All of them

Water vapour is the gaseous form of water in which the particles _____________.

• move slowly

• spin around in their fixed positions

• move past one to another

• move freely in all directions

In a gas, the particles vibrate faster because of having more _________.

• mass

• weight

• energy

• color

A chemical reaction involves _________________.

• the formation of new atoms

• the rearrangement of atoms

• the destruction of atoms

• the expansion of atoms

When a chemical reaction takes place, the number of each kind of atom before and after the chemical reaction is __________________.

When a chemical reaction takes place, new products are formed when new atoms are created.

• True

• False

Which of the following gives rise to a change in the state of a substance?

• The particles of the substance undergo rearrangement.

• A change in the motion and arrangement of the particles in the substance.

• The particles become damaged by the heat energy.

• All of them

Below shows a chemical equation in a chemical reaction. In which side of the equation where you can find the reactants?

• Right-hand side

• Left-hand side

• Both of them

• None of them

Which of the following are the products in the given illustration of chemical equation?

• 2 molecules of water

• 1 molecule of water

• 2 molecules of hydrogen

• 1 molecule of oxygen

When chlorine is liquefied, the particles _______________.

• which are in small groups break away and move about singly

• which are moving about singly, are pulled together to form small groups

• are pulled together and drawn back into their fixed positions

• breakaway from the fixed positions and move about in small groups