Homework 7

Study for your TEST!!!!
The test is on Thursday, and will cover all the topics we have discussed since the beginning of the year. Below is a link to the study guide that we created in class:

Study Guide

Beware! Not all of the answers are correct! I would rely on my notes rather than this study guide. It does give a good idea of the breadth of knowledge necessary though.

"Ugly" Animals

Animals come in all shapes, sizes, and appearances. Search the web to find what you consider to be the ugliest animal ever (dogs don't count). Respond to the following questions in an email to me, with the subject line "Ugly Animal":

1) What species is the animal?
2) Where is it from?
3) What does it eat?
4) What eats it?
5) Does its appearance help it in any way?

Homework 6

The Mysterious Planet

On a routine exploratory mission, you crash land on an unknown planet.
You discover lakes full of a beautiful silvery liquid. Some of your scientific equipment survives the trip, including a graduated cylinder, a balance, and a displacement beaker. You need to cross the lake in order retrieve your distress beacon, but you figure you better find out a bit about it first...

1. Explain in detail, step by step if necessary, how you would find the density of the mysterious liquid.

2. You find that 100 ml of the liquid weighs 25 grams. What is the density of the liquid? Show your work.

3. Your space rover has a density of 0.5 g/cm3. Will it float or sink in the mystery liquid? Why or why not?

4. Based on your findings of density and your knowledge of Archimedes principle, explain why crossing this lake is a bad idea.

Homework 5

Density and Displacement

1) Bring in a plastic soda bottle of at least 20 oz WITH cap!

2) Mix cooking oil and water together in a cup at home. Describe what happens. Explain why this happens in terms of density.

3) If possible, take a bath (if not, just use water in a cup and a large object). Note the water level before you get into the water;
a. What happens to the water level when you get in?
b. Why does the water level change?
c. How could this information be useful for finding density?

4) Calculate the Density for each of the following objects;
a. Mass = 55 g Volume = 105 mL
b. Mass = 34 g Volume = 40 mL
c. Mass = 75 g Volume = 60 mL
d. Which objects will float in water, and which will sink?

Homework 4

Density!

1) Water has a density of 1. If an object has a density greater than 1, will it float or sink?

2) Find and describe two objects/liquids with a density less than water. How did you know their density was less than water?

3) Consider H20 (water). How does the density of H20 compare in solid, liquid, and gas forms? (ice, water, steam)? Hint: put ice cubes in water!

4) Find the density of an object if volume = 127 ml and mass = 165 g. Will the object float or sink? Show your work!

Bonus: What is the volume of an object with a mass of 45 g and a density of 9 g/ml?