Name: ______________________________
2015 Properties, and Pure vs. Mixture Quiz
Self-Testing Guide
ANSWERS
REVIEW
Be prepared to Use the 5 rules of reading chemical formula to describe what type and number of each element are in these 3 chemical
formulas:
aspirin C – 9
aspirin C9H8O4
H–8
O-4
egg shells CaCO3
and
TNT C7H5N3O6
egg shells Ca – 1
C–1
O-3
and
TNT C - 7 H - 5
N-3
O-6
Finishing Structure of Matter
Remember when we learned to read chemical formulas for different substances like cow farts.
1. Describe the difference between a molecule and a compound.
If 2 or more atoms are bonded together it creates a molecule. Every chemical in the world can be called a molecule. If a molecule is
made of at least 2 different types of atoms (elements) it is also called a compound. All compounds are also molecules, but not all
molecules are compounds.
2. Describe and explain whether TiO2 is a molecule, a compound or both based on its chemical formula or a sketch.
Since TiO2 has at least 2 atoms in its chemical formula, it is considered a molecule, but it also has 2 different two types of atoms
(elements) in the formula so it is also considered a compound.
Properties of Matter
Remember when we created double-bubble thinking maps to find the similarities and differences of a wood and glass sphere, and
chose material for products based on their properties.
3. Describe the concept of properties in your own words.
Properties describe matter; you could also call them characteristics or features of matter.
4. Give 3 examples of physical properties of a glass marble.
A glass marble has the properties of being smooth, transparent, and without any noticeable odor.
5. Use the knowledge that samples with different properties are different types of matter. For example, if I have 1 cube that is rough, dark
brown, and feels light in my hand and a second cube that is smooth, dark brown and feels heavy in my hand, are they the same type of
matter? Include evidence to support your answer.
The cubes described above are different types of matter because properties define matter; since the properties are different the matter is
almost certainly different.
6. Use the properties of wood to explain 2 reasons why it’s a good type of matter for a classroom door.
Pure Substances and Mixtures
Remember when we read in the textbook to find evidence for which things on the list were pure substances and which where mixtures
and did a lab where we sorted 8 things, like toothpaste and rice and beans?
7. Define the concept of a pure substance; be sure to include both types of pure substances.
A pure substance contains only 1 type of matter. It could be a single element or a compound/molecule as long as the atoms are bonded
together.
8. Name 3 ordinary pure substances
Three examples of ordinary pure substances are copper wire, purified water and sugar.
9. Describe a mixture. A mixture is a combination of two or more substances that remain individual substances.
10. Name 3 ordinary mixtures.
Three examples of ordinary mixtures are cereal in milk, rice and beans, and cola drinks.
11. When you make a mixture, do any of the ingredients change chemically? How do you know?
The parts of a mixture do not change chemically. Banana slices in fruit salad remain banana. Sugar added to water still tastes like sugar.
12. What defines a homogenous mixture? Give an example.
A homogenous mixture is a mixture that has ingredients spread evenly throughout. Sugar water is an example of a homogenous mixture
because it tastes the same throughout.
13. What defines a heterogeneous mixture? Give an example.
A heterogeneous mixture is a mixture that has ingredients that ARE NOT spread evenly throughout. You would see more of one
ingredient in some parts. Chicken noodle soup is an example of heterogeneous mixture because you will have different amount of broth,
noodles and chicken in each spoonful.