common questions

Cards (7)

state why the mass of the contents of the flask decreased?
gas has escaped
state the purpose of cotton wool?
prevent any acid leaving beaker
state and explain the effect that a catalyst has on the rate of reaction?
increases rate of reaction
lowers activation energy
provides alternate pathway
suggest why this reaction only occurs at higher temperatures?
has a higher activation energy
suggest why the volume collected is less than the expected volume?
some gas dissolved in the solution
suggest why the balance has negative values?
gas is produced and escapes out the flask
suggest a mistake made for an anomoly?
concentration of acid is too high