Pure Substances
An pure substance consists of only __________ type of particles throughout.
one
A mixture consists of matter that contains ______________ pure substances chemically bound to each other.
two or more
In heterogeneous mixtures, particles are distributed ________________.
unevenly.
In homogeneous mixtures, substances are ____________ distributed.
evenly
Anything that takes up space and has mass.
Matter
Particles are the smallest unit of matter, we can also think of them as the building blocks of matter.
What are Particles?
Mixtures can be classified by these two H-words
Heterogenous
Homogeneous
True or false: heterogenous mixtures can be a mixture of solids, liquids, and/or gases.
True.
Mixtures can be any combination of all states of matter: solids, liquids, and gases.
Which is the following is true about a diamond which is made up of carbon atoms only?
A. It is homogeneous
B. It is heterogenous
C. Neither
C. Neither!
Diamonds are pure substances because they are made of carbon.
All matter is made up of ___________________.
many tiny particles that we can not see
True or false: Iron is an pure substance.
True.
True or false: Sodium is a solution.
False!
Sodium is a pure substance.
Provide 3 examples of heterogeneous mixtures.
Good work!
Provide 3 examples of homogeneous mixtures.
Good work!
All __________ are made up of the same kind of particle (atom).
Pure substances
What is the most common element in the universe?
Hydrogen.
True or False: A stainless steel pot is a solution.
True.
Stainless steel is made of iron, chromium, and nickel particles.
Is a heterogeneous mixture chemically combined?
*hint* Think about solutions.
No. Heterogeneous mixtures are combined but not chemically like solutions.
Does mixing oil and water (like we did in class) create a homogeneous mixture? Why or why not?
Mixing oil and water creates a heterogeneous mixture because we can see the oil and the water.
True or false: The particles in boiling water are moving slower than the particles in an ice cube.
False.
Particles at higher temperature move faster than those at lower temperature.
Where you will find all elements (pure substances)?
Periodic table of elements
Is distilled water a pure substance or a mixture?
Distilled water is a pure substance because it is composed solely of water molecules (H20) and has a uniform and definite composition. The distillation process removes dissolved substances like minerals and salts, making it different from tap water, which is a mixture.
If a person has a coffee with milk, a caesar salad, trail mix and a yogurt for lunch, which of the these are heterogeneous mixtures?
Caesar salad and trail mix are heterogeneous mixtures.
What is another term we can use for homogeneous mixtures?
Solution
True or false: You are more likely to get a flat bike tire in the summer.
True.
Bike tires expand in the heat due to the air inside expanding, which increases pressure and can lead to a higher risk of flats or blowouts.