Lesson 1: Describing and Classifying Matter
What is matter?
Anything that has Mass and takes up space.
The moon has much less mass than Earth. Therefore, your weight on the moon is ________ of your weight on Earth! (fill in the blank).
1/6
What are four examples of physical changes
Breaking, bending, carving, and crushing.
Which scientist proved the conservation of mass in the 1770s?
Antoine Lavoisier
How do you know if a substance is "pure"?
its composition is the same whether you’re looking at a whole piece or a small part of the same substance
As the force of gravity changes, what else changes?
Weight
What is a chemical change?
a change in which one or more substances combine or break apart to form new substances
Temperature is related to what two aspects of particles of matter?
Energy and motion.
Create a diagram of an atom, label the Nucleus, protons, neutrons, and electrons.
One kilogram is equivalent to how many pounds?
1 kilogram = 2.2 pounds
What are four different ways to describe a chemical change?
Color change, flame, temperature change, gas bubbles.
What does the word "distill" mean?
to separate liquids by boiling them
What is one example of a chemical compound?
C02, H2O, etc.
A rock has a mass of 45g and a volume of 15 cm3. What is the density of the rock?
3 g/cm3
What is the difference between an endothermic and exothermic change?
endothermic: a change in which energy is absorbed
exothermic: occurs when energy is released
Draw one molecule of methane
(Drawings should have 1 carbon atom, and 4 hydrogen atoms).
What are the four methods used to separate mixtures?
Magnetic attraction, distillation, evaporation, filtration.
In most cases, what happens to the density of a substance when the temperature increases?
Most substances become less dense.
What happens when a methane molecule and two oxygen molecules react with one another?
A carbon dioxide molecule, and two water molecules are formed.
What is a molecule?
a neutral group of two or more atoms held together by covalent bonds