6.2 Hydrochloric acid produces a gas. So does ammonia solution. These two gases react when they meet to form a white solid called ammonium chloride.
Some cotton wool soaked in hydrochloric acid was placed at one end of a glass tube.
Some cotton wool soaked in ammonia solution was placed at the other end.
The diagram shows what happened.
cotton wool soaked
in hydrochloric acid
white band of ammonium chloride
formed when the gases meet
cotton wool soaked
in ammonia solution
I
a What is the name of the process by which the gases move along the tube?
bExplain how this process takes place.
The particles of hydrochloric acid have a greater mass than the particles
of ammonia. Suggest why the ammonium chloride is formed nearer to
the hydrochloric acid end of the tube than the ammonia solution end.

Which statement describes evidence of a chemical reaction? a) ice melting eliminate b) water boiling c) lighting a match d) grape juice freezing

Asolution of sodium hydroxide was titrated against a solution of sulfuric acid. how many moles of sodium hydroxide would react with 1 mole of sulfuric acid?

Follow the steps provided in the simulation to add water to the graduated cylinder, select one of the three samples (copper, silver, or gold), set its mass to the values given in the statements below, and calculate its density. here is a summary of the steps required: add water by clicking and holding prepare a known volume of water button. until the desired volume of water has been added. if more than the desired volume is added, click the reset button. button and redo the procedure. a single click will add about 21.0 ml of water. to set the mass, click and hold weigh out metal button. until the desired amount of metal is added to the weighing pan. once the desired mass of the metal is added, release the button. transfer the metal to water and then click on calculate density button. to see how the density is calculated using water displacement to measure the volume of the solid. to save time you can approximate the initial volume of water to â±1 ml and the initial mass of the solid to â±1 g. for example, if you are asked to add 23 ml of water, add between 22 ml and 24 ml. which metals in each of the following sets will have equal density? check all that apply.