Acids
Are acids sour or bitter to taste? (don't actually taste one please)
sour
True or False: Bananas are acidic
True. Bananas are slightly acidic.
So why do we eat them when we have an upset stomach?
What happens when molecules are heated? Do they speed up or slow down?
Speed up!
Name 2 places CO2 exists in the world
answers will vary:
ex) in our breath when we exhale and in a soda can
give one example of a reversible and irreversible reaction.
answers can vary
ex) cooking eggs is irreversible and boiling water is reversible
is milk considered acidic?
Milk is slightly acidic.
Bases are s _ _ _ _ _ _ _ in nature
what is solubility
the amount a solute can disappear completely in a solvent
answers may vary
ex) coke and mentos experiment
what is a litmus paper indicator used for?
used to see if a liquid is acid or base
name 3 acids you might find naturally in the world
answers vary
ex) citric acid (in lemons), gastic acid (in our stomachs), sulfuric acid (in batteries)
What dose the ph scale do ?
measures how acidic or basic liquid are from 0-14
True of False: Molecules are the smallest unit of matter
False. _ _ _ _ are the smallest units of matter.
True or False: Carbon Dioxide is the most abundant gas found in our air
False. It's actually ________ ?
Surface tension is the film that forms on the surface of a liquid caused by c _ _ _ _ _ _ _.
Cohesion
True or False: Acids will release free hydroxide ions when dissolved in water
False. They release ______
list three bases that release hydroxide ions (-OH) in water. The -OH the more basic the liquid is on the ph scale
answers can vary:
ex) baking soda,ammonia and bleach
True or False: Particles in a solid do not move at all.
False: While, the particles are held together too strongly to allow movement from place to place, they
_ _ _ _ _ _ _ about their position in the structure.
Most commonly, c _ _ _ _ _ _ _ _ _ reactions produce carbon dioxide.
Combustion reactions (like a fire)
A compound is made up of water molecules formed with ...
Two hydrogen atoms and one oxygen atom.
The stronger an acid, the more easily it _ _ _ _ _ _ _ a hydrogen ion.
Donates
What is another word we use to describe a substance that is a basic?
Alkaline
Crystals are formed from vapors, solutions, or melts! Pressure, heat, or evaporation causes a chemical reaction and some of the atoms and molecules are forced to change and join into a cluster.
What are 2 ways of extinguishing a candle without blowing it out? Provide the scientific reasoning.
1. Cover the flame and cut the supply of oxygen using a glass jar
2. Using baking soda and vinegar to create CO2 which you can "pour" on top of the candle.
Provide at least 4 signs to look for which indicate a chemical reaction is taking place
Change in smell
Change in temperature
Change in colour
Light and/or sound is given off
A gas is formed
A precipitate is formed