Chemistry Unit 1 Review

What is chemistry?

• The study of how elements react to each other

• The study of matter and the changes it undergoes

• The study of chemicals and the changes they undergo

• The study of the periodic table

What is matter?

• Anything that has mass and volume

• Something that has no mass and doesn't take up space
• Anything that is invisible

What is energy?

• Anything that can do work or produce heat

• Energy is a type of gas
• Energy is only found in living organisms
• Energy is the same as matter

What is weight?

• The force of velocity acting on an object's mass

• The amount of volume within an object

• The amount of mass within an object

• The force of gravity acting on an object's mass

Which of the following are characteristics of pure substances?

• Uniform and definite composition/formula

• Elements

• Compounds

• Homogeneous solution

What is a compound

• Formed when elements are chemically combined

• Formed when two homogenous solutions are combined

• Formed when two heterogenous mixtures are combined

• When a substance undergoes a chemical change

What is a mixture?

• Two chemicals undergoing a change

• Two elements form a compound

• Two or more substances are chemically blended together

• Two or more substances are physically blended together

What is a heterogenous mixture?

• A mixture with parts that can visibly be identified and doesn't have a uniform composition

• A mixture that cannot be separated by physical means
• A mixture that is completely uniform in composition
• A mixture that contains only one substance

What is a homogenous mixture?

• A mixture where the components are unevenly distributed
• A mixture where the components are constantly changing
• A mixture that looks the same throughout, it has a uniform composition, this includes any solutions. ex:) brine, contact solution, milk

• A mixture where the components are separated into layers

What are physical properties?

• The taste of a substance
• The phenotypes of a substance

• Can be measured or observed without changing the identity of a substance (chemical make up does NOT change)

• The political affiliation of an individual