Flashcards in Physical And Chemical Changes Deck (21):
What happens in a chemical change?
Chemical bonds are made or broken
What happens in a physical change?
Chemical bonds do not change
What is the transition between a solid and a liquid called?
What is the transition between a liquid and a gas called?
What is the transition between a liquid and a solid called?
What is the transition between a gas and a liquid called?
Is frying an egg a physical or chemical change?
Is a bike rusting a physical or chemical change?
Is food dye changing the colour of water a physical or chemical change?
Is digestion in the stomach by stomach liquids a physical or chemical change?
Is melting ice cream a physical or chemical change?
Is fruit ripening a physical or chemical change?
Is burning a match a physical or chemical change?
Is fireworks exploding a physical or chemical change?
Is dissolving sugar in water a physical or chemical change?
Are chemical changes usually reversible?
Is a glass bottle smashing a physical or chemical change?
Fill in the blanks: A __________ is a long molecule made up of many smaller identical molecules (called monomers) bonded together.
Fill in the blanks: Corrosion is a type of chemical reaction between a __________ and substances in its environment that results in the metal being ‘eaten away’. The most common form of corrosion that we encounter is the corrosion of iron, a process referred to as rusting. Over time, rusting can cause enormous damage to buildings, bridges, ships, railway tracks and cars.
When iron reacts with __________ and oxygen in the air it forms iron __________ and other iron compounds that make up the familiar red-brown substance known as rust.
Some substances in the environment make the rusting reaction happen much more quickly. One of the most effective of these is __________. Steel dinghies that are used in the ocean rust much faster than those that are used only in fresh water.
Fill in the blanks: There are a number of factors that can be changed in order to alter the speed of a chemical reaction.
The following descriptions show how we can speed up a reaction:
The __________ is increased (this means the reactant particles will be moving around faster)
The __________ of a reactant is increased (this means that there will be more particles to react)
The __________ area is increased (this means a greater number of reactant particles are exposed)
A __________ is used (although this is not used up in the reaction it causes it to happen faster)