Classification of Matter
Give the name for a pure substance made of only one kind of atom
Element
Which property of water causes water to stick to something else?
adhesion
Define cohesion in one sentence
cohesion- water sticking to itself, or something sticking to itself
On the pH scale, are acids less than, equal to, or greater than 7
less than 7
What is the pH of pure water at room temperature?
pH 7
What do we call two or more different elements chemically bonded together (a pure substance with atoms of different elements)
Compound
Which property of water allows water molecules to stick together?
cohesion
Define adhesion in one sentence
Water sticking to something else, or something sticking to something else
On the pH scale, are bases less than, equal to, or greater than 7?
greater than 7 (8-14)
A mystery substance that is slippery and has a pH of 12 is considered what?
base
Name a mixture where the composition is the same throughout and you cannot see separate parts
Homogenous Mixture
Which property of water is caused by cohesion and allows insects to walk on water?
surface tension
How does cohesion help form water droplets on a waxed car surface?
Cohesion allows the water droplets to stick together to form a bigger droplet on the car hood
On the pH scale, pure water is less than, equal to, or greater than 7?
equal to 7
A mystery substance tastes very sour and has a pH of 4 is considered a what?
an acid
Give an example of a heterogeneous mixture and explain why it is heterogeneous
Trail mix, salad, burger, taco, pizza, etc..... you can separate it
Which two properties of water work together to create capillary action in plants bringing water from the roots to the leaves?
adhesion and cohesion
What is the difference between adhesion, cohesion, and surface tension in the following scenario:
After a heavy thunderstorm everyone likes to go check to see how much rain they had. Upon checking outside the farmer noticed his 5 gallon bucket was full of water.
The adhesion was the water sticking to the inside of the bucket
The cohesion was the water droplets sticking together inside the bucket
The surface tension was the water at the top surface of the bucket.
What happens to litmus paper when it is placed in an acidic solution? And in a basic solution?
Acid: Red litmus paper doesn't change color, blue litmus paper turns red/pink
Base: Red litmus paper turns blue, and blue litmus paper doesn't change color
In the following chemical equation:
3C2H+ Fe --> 6C3H +Fe
What is the 3 in the equation and what does it mean?
What is the 2 in the equation and what does it mean?
Where is the compound?
How many elements are in the equation?
3 is the coefficient, means you multiple by every capital letter
2 is the subscirpt, means number of atoms
The compound is 3C2H
The elements are C, H, Fe
Describe how you would show the difference between an element, a compound, a homogeneous mixture, and a heterogeneous mixture.
Element- 1 Capital letter, Compound- atleast 2 capital letters chemically combined. Homogenous mixture- uniform, can't separate it. Heterogeneous Mixture- you can separate it, like trail mix, pizza, taco, burger, salad etc
Which property of water allows water to stick to a plant? Which property of water allows the water droplets to get bigger and bigger?
adhesion, cohesion
Describe why some insects can walk on water; include the terms surface tension and cohesion in your answer.
Insects can walk on water because water droplets use cohesion to stick together, at the surface the cohesion is strong enough to create surface tension, with this strong surface tension at the surface insects can walk on water.
Name one observable property (taste or effect) that can help identify an acid and one property for a base.
acids are corrosive, or taste sour, bases are slippery
Which part of the pH scale can conduct electricity? Acids? Bases? Both?
Both