Chemical Reactions Flashcards
What are physical changes? (2)
Changing the state of the object (changing of appearance ), No new substance is made
What are chemical changes?
One or more substances are used up while new substances are formed
Where can calcium carbonate be found? (4)
Chalk, pearl, eggshell and marble
What happens when acids react with calcium carbonate? And how can you tell?
Carbon dioxide is formed, gas bubbles appear
How do we test for carbon dioxide? (What do we use )
Lime water
What is the word equation forthe lime water test
Acid + calcium carbonate → carbon dioxide, water and salt
How to tell if carbon dioxide is present using the lime water test (what are the changes in appearance )
Clear → cloudy/ white precipitate
How do you test for hydrogen (what test do you use?)
Squeaky Pop test
How do you conduct the squeaky pop test?
Light a splint and put the splint near the mouth of a test tube. If a high pitched pop sound is produced, then there is hydrogen
How do you test for oxygen?
Use a glowing splint and put it into the test tube. Ifthe splint relights there is oxygen in the tube.
What term do you use for when heat is given out
Exothermic
What does this word equation mean? Acid + metal → salt + hydrogen
Metal pieces are becoming smaller
What do you call it when a fuel reacts with oxygen in the air?
Combustion
What are the 3 sides of the fire triangle
Fuel, oxygen, and heat
What is the word equation for combustion
Fuel+ oxygen → (heat) energy + carbon dioxide + water
