A
What is the definition of chemistry?
The study of the structure and interactions of matter
T/F: Alchemy Is the most modern branch of Chemistry formed in 1922.
False: Alchemy is not a branch of chemistry.
What are the primary characteristics of a solid?
It has a definite shape and volume
What type of mixture has particles that are large enough to be seen and easily separated?
Heterogeneous
Which of the following is an example of a chemical change?
Melting Ice, Cutting Paper, Dissolving sugar in water, Rusting of Iron
Rusting of Iron
What is an element?
A pure substance made up of only one type of atom
What is the main property of a liquid?
It has a definite volume but takes the shape of its container
What is a homogeneous mixture?
A mixture with a uniform composition throughout
Where can you find information about elements, including their atomic numbers and masses?
The Periodic Table
What is a compound?
A pure substance made up of two or more elements chemically combined
Which of the following is an example of a heterogeneous mixture?
Salt water, Air, Salad, Steel
Salad
Give an example of a homogeneous mixture.
Salt water, sugar dissolved in water, air, vinegar, steel
What is a physical change?
A change in the appearance or form of a substance without creating a new substance
Give an example of a physical and chemical change that we have not yet talked about today.
Physical: melting, shredding, chopping, mixing
Chemical: combusting, emitting light, oxidizing, baking, browning
The periodic table shows all 118 known
elements
T/F: Dissolving salt in water is a physical change.
False: this is a chemical change. Dissolving SUGAR in water is physical.
What type of mixture is fresh milk?
Heterogeneous mixture
Which branch of chemistry deals with carbon-containing compounds?
Organic Chemistry (organic means carbon-containing)
Which of these is a pure substance?
Air, steel, iron, tomato juice
Iron
What is the process of a solid changing directly into a gas called?
Sublimation