Reviewing The Scientific Method

1. State the Problem2. Research/Observe3. Form a Hypothesis4. Test the Hypothesis

5. Collect Data6. Analyze the Data/Retest7. Form a Conclusion

DENSITY

What is Density?

• Density is the mass of an object divided by its volume

D = __Mass_(g)__ Volume (cm3) or (mL)

Mass refers to the amount of matter in an object.

In our activity, we will be working in grams (g)

Volume is the amount of space an object takes up.

In our activity, we will be working in mL or cm3

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Mass = the amount of matter in an objectUnit for Mass is grams. (g)

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Volume = the amount of space a (3D) object takes up Units for Volume are mL or cm3

How to Measure Mass

We will be using triple-beam balances to find the mass of various objects.

The objects are placed on the scale and then you move the weights on the beams until you get the lines on the right-side of the scale to match up.

Once you have balanced the scale, you add up the amounts on each beam to find the total mass.

What would be the mass of the object measured in the picture?

_______ + ______ + _______ = ________ g

Reading a Graduated Cylinder

We will be using graduated cylinders to find the volume of irregularly-shaped objects.

Read the measurement based on the bottom of the meniscus or curve. When using a real cylinder, make sure you are eye-level with the level of the water.

What is the volume of water in the cylinder? _____mL

We can measure the volume of irregular object using water displacement.

Amount of H2O without object = ______

About of H2O with object = ______

Difference (before-after) = Volume = ______

How to Measure Irregular Volume

How to Measure Solid Volume

10 cm

9 cm

8 cm

We can measure the volume of regular-shaped object using the formula length x width x height.

_____ X _____ X _____ = _____

Remember, use

centimenters!

How many cm is this?

10

Density of Water = 1 g/mLAnything with a density less than 1 g/mL will float in it!

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Learning Check

Which diagram correctly represents the liquid layers in the cylinder?(K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL)

1) 2) 3)

K

K

W

W

W

V

V

V

K