Gases and Ions Flashcards
(48 cards)
How can you test for hydrogen? What is the result?
Test: Insert a lit splint into a tube of the gas.
Result: The gas will burn with a squeaky pop.
How can you test for oxygen? What is the result?
Test: Insert a glowing splint into the tube of gas.
Result: The glowing splint will relight.
How can you test for carbon dioxide? What is the result?
Test: Bubble some of the gas through limewater.
Result: The limewater will go cloudy.
How can you test for chlorine? What is the result?
Test: Hold damp litmus paper near the gas.
Result: The litmus paper will be bleached white
What is a use of hydrogen?
Hydrogen can be used as fuel.
What is a use of oxygen?
We use it for breathing.
What is a use of carbon dioxide?
Photosynthesis
what is a use of chlorine?
Used to sterilize swimming pools.
How do you experimentally prepare hydrogen?
Add zinc in test tube. Add dilute hydrochloric acid to the test tube. The reaction will produce hydrogen. Test the gas being produced.
How do you experimentally prepare oxygen?
Add hydrogen peroxide into conical flask. Add manganese dioxide as a catalyst. This will produce oxygen. Test the gas being produced.
How do you experimentally prepare carbon dioxide?
Place calcium carbonate in a flask. Add dilute hydrochloric acid to the flask. This will produce Carbon dioxide. Test the gas being produced.
What is the balanced symbol equation of the production of hydrogen?
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
What is the balanced symbol equation of the production of oxygen?
2H2O2(aq) (with MnO2 as Catalyst) —–) 2H2O(l) + O2(g)
What is the balanced symbol equation of the production of carbon dioxide?
CaCO3(s) + 2HCl(aq) —–) CaCl2(aq) + H2O(l) + CO2(g)
What is thermal decomposition?
A type of chemical reaction in where a single substance breaks down int two or more substances when heated.
Name 2 examples of thermal decomposition.
Copper carbonate and Calcium carbonate.
How do you balance symbol equations?
Write the unbalanced equation. Identify the states of each substance. Check the number of atoms and adjust the numbers in front of the molecule to suit the number of atoms,
What are cations?
Positively charged ions.
What are anions?
Negatively charged ions.
How do you perform a flame test?
Dip a wire into the sample. Put it into the blue part of a Bunsen burner. Observe the colour of the flame.
What are precipitation reactions?
A type of reaction where two aqueous solutions form an insoluble solid.
How do you write balanced symbol equations for precipitation reactions?
You take the first element out of the compound and combine it with the second element of the other compound. Do this with both compounds (making sure the ions fit). All the substances will be aqueous apart from one of the resulting compounds(this will be a solid)
What does the state symbol s mean?
solid
What does the state symbol l mean?
liquid
