What physical state is water in at room temperature?
Liquid
100
In what lab did we witness water cohesion?
The lab where water ran down a string.
100
What are the two branches of science you learned about? How are they different?
Biology and Chemistry. Biology is the study of living things, and chemistry is the study of matter.
100
What is an element?
Unchangeable substances with specific chemical properties.
100
What are the 3 physical states of matter?
Solid, liquid, and gas
200
Is water polar or non polar?
Polar
200
In what lab did we see a chemical reaction occur?
Multiple possible answers - use discretion.
200
Define chemical reaction.
When two molecules or substances are combined to form something new.
200
In the periodic table, what does the number at the top of each element represent? (In other words, how is it ordered?)
The Atomic Number, # of protons/electrons, etc.
200
In which of the three states are the atoms/molecules moving the fastest?
The gaseous state.
300
What is the chemical formula for a water molecule?
Draw on board!
300
What did we learn in the lab where we put soap in the milk with food coloring in it?
Polar and non polar molecules do not mix.
300
What are the five ways you can know a chemical reaction has occurred?
Change in temperature, change in color, gas formed, precipitate formed, production of odor.
300
What are the parts of an atom and their charges?
Proton - positive
Neutron - neutral/no charge
Electron - negative
300
Which state of matter is the coldest?
Solid state. (state is closely related to temp. Can review).
400
Define polarity
How electrons are shared in a molecule. Unequal sharing = polar. Equal sharing = non polar
400
In the first lab where we combined baking soda and vinegar, why did the balloon inflate? (Bonus 100 points if you can tell me what exactly was in the balloon!)
Gas given off from the reaction between baking soda and vinegar caused the balloon to inflate. The gas was Carbon Dioxide.
400
Define density.
Mass/volume. (give example?)
400
What is the place in an atom where all the neutrons and protons are located called?
The nucleus
400
What is the term for the change from a liquid to a solid.
Freezing.
500
Define cohesion and describe how it is related to water.
Cohesion is the attraction of water molecules to each other.
500
In the "Savage Cabbage" experiment, what did the color change of the solution depend on?
The pH (or acidity or basicity) of the solution.
500
Is sugar soluble in water? What would the water be called in this case?
Yes! Water is the solvent.
500
What is a molecule?
A combination of atoms.
500
What is the term for changing from a liquid to a gas?