Density is how much mass of a substance is contained in a given volume.
Mass is anything that has matter and takes up space.
Density, therefore, is a measure of mass inside a specific volume.
100
What is the same about molecules and compounds?
They both have at least two atoms.
100
What are the differences between chemical and physical reactions?
Physical reactions do not create any new substances, whereas chemical reactions do.
100
Can you classify the type of observation below?
The balloon is red.
What is a qualitative observation.
100
What can you say about matter?
It takes up space, there are three forms, etc.
200
How can you use a scale to measure mass?
1. Always make sure the line is in the middle of the balance on the right side. This is called “tarre”. Or zeroing the balance
2. Once the balance is “Zero’ed” place the object that you want to mass on the plate.
3. Set all weights to Zero (slide them all the way to the left and make sure they are clicked into the notch)
4. Move the lightest weight to the right first. Try to get the line to match in the middle.
5. If it does not match, the item is still heavier than the weight. Move the middle and back weights until the balance is equal with the lines.
6. Read and record your mass. Use Grams as your label.
200
What would be the result of hydrogen chemically bonding with oxygen?
A compound would be created. (H2O)
200
What would happen if we soaked a piece of paper in water?
It would be a physical reaction, because the water could evaporate. No new chemicals were created in the reaction.
200
How would you explain the difference between a qualitative and a quantitative observation?
Qualitative observations use your senses. Quantitative observations use numbers.
200
Salt water is a solution. Do you know of another instance where a solution is created?
Sugar water, hot cocoa, tea, etc
300
How is volume related to density?
A volume is set. Then you measure how much mass is inside that volume. This is the density.
300
What is the relationship between atoms and molecules?
Atoms are the smallest building blocks of molecules.
300
Can you distinguish between a mixture and a solution?
A mixture might not always be evenly distributed. Solutions are always evenly distributed.
300
What are some of the problems of this observation:
The chair is big.
Big is a relative term.
300
What can you infer about chemistry? What can you infer the study of chemistry is?
Chemistry is the study of matter
400
What do you think the most important step is in measuring volume?
Answers may vary.
400
What would happen if there were lots of atoms that were exactly the same all together?
It would be an element!
400
How can you determine if a reaction was physical or chemical?
Can you reverse it? Were any new chemicals created?
400
FREEBIE
FREE 400 POINTS
400
There is a mystery substance. How can you determine if it is a solid, liquid, or gas?
What is the density? Does it keep its shape? How do the molecules move? What is its melting point? Boiling Point?
500
With the proper resources and tools, how would you deal with finding the density of an elephant?
Use a scale to find the mass. Use a dunk tank to find the volume. Do the math.
500
In what way can you design a model of a compound? An element? A molecule? An atom? What would they look like
Answers may vary.
500
How can you construct a model to show the differences between a solution and a mixture?
Answers will vary
500
With the proper resources, how would you deal with recording observations about a mystery substance?
Write, take pictures, waft, shake, etc
500
How would you test your peers in what we've learned so far in science?