Composition of Air

Which of the gases below make up the most percentage of air in the atmosphere?

• nitrogen

• oxygen

• carbon dioxide

• inert gases

At the end of the experiment, the water level rose to one fifth of the gas jar. What does this show us?

• air consists of 25 percent oxygen

• one fifth of the air contains oxygen

• the air pressure inside of the gas jar is high

• oxygen dissolve in water resulting in the rise in water level

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the gases below make up the smallest percentage of air in the atmosphere?

• nitrogen

• oxygen

• carbon dioxide

• inert gases

Why is air a mixture?

• air is made up of various gases molecules and compound combined chemically

• air is made up of various gases molecules and compound combined together physically

• the components of air can be separated by a chemical method (electrolysis)

• the components in air can be separated by a physical method (fractional distillation)

Why did the flame become extinguished at the end of the experiment?

• Because it has used up all the carbon dioxide gas in the gas jar

• Because water has entered the gas jar

• Because it has used up all oxygen in the gas jar

• Because there is no air inside the gas jar

Tags

NGSS.MS-PS1-4

Which of the following gases has the highest composition in the air?

• Oxygen

• Nitrogen

• Inert gases

• Carbon dioxide

Which gas contributes the largest part of air?

• carbon dioxide

• nitrogen

• sulphur dioxide

• oxygen

What is observed in this activity?

• Colour of flame

• Production of heat

• Level of water in the gas jar

• Time taken for the candle to burn

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Why air is classified as a mixture?

• Separated by chemical method

• Density of air is low

• Air particles are difficult to separate

• Separated by undergo fractional distillation process

What is the most abundant gas in Earth's atmosphere?

• Nitrogen

• Oxygen

• Carbon Dioxide

• Argon