Chemistry Quiz on Gas Molecules

What happens when two hydrogen atoms collide?

• They bounce off each other.

• They form a double bond.

• They join to make an H2 molecule.

• They turn into oxygen.

How do oxygen atoms bond when they collide?

• They form a single bond.

• They form a triple bond.

• They form a double bond.

• They do not bond.

What do individual gas molecules do in a box?

• They stay still.

• They move in straight lines and bounce off walls.

• They form clusters.

• They disappear.

What happens when gas molecules collide with each other in a box?

• They form new molecules.

• They bounce off each other.

• They explode.

• They merge into one.

Why do molecules speed up when a flame is introduced?

• Because they are cooled down.

• Because they are compressed.

• Because heat makes them move faster.

• Because they are attracted to the flame.

What is the valency of an oxygen atom?

• 1

• 2

• 3

• 4

What is the role of heat in the reaction between hydrogen and oxygen?

• It slows down the reaction.

• It speeds up the molecules, causing them to bust apart.

• It cools the molecules.

• It prevents the reaction.

What happens to the atoms once they are on their own?

• They remain isolated.

• They join with other atoms.

• They disappear.

• They form a solid.

What is the significance of adding an extra H2 molecule?

• It decreases the reaction rate.

• It allows both oxygen atoms to bond with hydrogen.

• It increases the temperature.

• It prevents the reaction.

What is the purpose of using structural formulas in the reaction?

• To show the color of molecules

• To show the size of molecules

• To show molecules as symbols joined by sticks

• To show the weight of molecules