Groups
What do we call group 7 elements?
Halogens
The quantity of reactant or product can be measured by the mass in grams or by a volume in ....
cm3
What do acids produce when dissolved in water?
H+ ions
Name a greenhouse gas
carbon dioxide, methane, water vapour
How does reactivity change down group 7?
Decreases
The minimum amount of energy that particles must have to react is the
Activation energy
pH of a strong alkali
12-14
What is made when hydrocarbons burn completely?
Carbon dioxide + Water
Explain why helium is inert
Full outer shell so does not need to gain or lose electrons
Four ways to increase the frequency of collisions between reacting particles
Pressure
Temp
Conc
Surface area
Explain what colour universal indicator will change when sodium hydroxide is mixed with hydrochloric acid
green- neutral solution produced
Iron wool is placed in an upside down test tube filled with water. Explain why water rises up the test tube.
Iron reacts with oxygen which decreases volume of air. The water rises to fill the space
Write the word equation for the reaction between potassium iodide and chlorine
potassium iodide + chlorine --> potassium chloride + iodine
Which way of increasing the rate of reaction increases the kinetic energy of particles?
Temp
What should I mix together to make silver hydroxide?
silver nitrate and sodium hydroxide
Explain an affect of acid rain
kills trees/aquatic life
errodes buildings/statues
Explain what is oxidised in the reaction below:
2Br- + Cl2 --> 2Cl- + Br2
Br- /Bromide - loss of electrons
What change the rate of chemical reactions but are not used up during the reaction?
Catalysts
Write a balanced equation for the reaction between calcium oxide and nitric acid
CaO + 2HNO3 --> Ca(NO3)2 + H2O
Calculate the number of moles of chlorine molecules in 142 g of chlorine gas.
2 moles