Flashcards in Acids and Alkalis Deck (16):
An example of an alkali is...
All acids contain the element:
What is the pH of a neutral solution?
What is the reaction between an acid and an alkali known as?
What is the word equation for the reaction between an acid and an alkali?
Why is heartburn treated using an alkali?
To neutralise the excess acid in your stomach
How is acid rain produced from fossil fuels?
1. Fossil fuels are burned
2. Sulfer in the fuels reacts with oxygen in the air to form sulfer dioxide
3. Sulfer dioxide reacts with water in clouds
4. To form sulfuric acid
5. This falls as acid rain
What salt is formed when sulfuric acid and magnesium react?
Some students add drops of an acid onto a rock sample. They observe bubbles. What is the gas given off?
A student weighed a crucible containing steel wool. He then burned the steel wool and reweighed the crucible. The mass after burning would be:
More than before because you are adding oxygen
What chemical could you use to show that carbon dioxide was produced during the reaction between hydrochloric acid and calcium carbonate?
What type of chemical is it when it is described as ‘soapy’ and when it is tested with an indicator, it is shown to have a pH of 9?
This chemical is an alkali because it has a pH higher than 7. Many alkalis feel soapy
Why does a concentrated acid give a more vigorous reaction with a metal than a dilute acid with the same metal?
A concentrated acid contains more acid particles than a dilute acid which has fewer acid particles (dilute contains more water) so in the concentrated acid there are more acid particles to react
How could you put a campfire out?
In the fire triangle there is oxygen, heat and fuel. To make it go out add no more fuel and wait until fire goes out. Cover the fire (e.g. with sand) to stop oxygen getting in. Reduce heat by pouring on water.
METAL | OBSERVATIONS
Unknown metal | bubbles seen, test tube became warmer
Calcium | lots of bubbles produced very quickly, test tube
| became very hot
Zinc | few bubbles seen
What is the difference of the reactivity of the unknown metal with that of calcium and zinc?
The unknown metal is more reactive than zinc but less reactive than calcium. The reaction of the unknown metal is more vigorous with zinc but less vigorous than with calcium.