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Density Notes- Part 1 Chemistry 1PowerPoint Presentation

Density Notes- Part 1 Chemistry 1

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### Density Notes- Part 1Chemistry 1

Density

- The compactness and size of the molecules or particles of a substance
- the more compact or squished together the molecules are and the more mass the particles have, the larger the density

- The relationship between an object’s MASS and VOLUME
- Density is a characteristic property of substances and can be used to help identify substances.

- MASS is the amount of matter an object contains
- Mass does not change unless you add or remove matter

- VOLUME is the amount of space an object occupies
- Density = Mass
Volume

Finding Mass and Volume

- Mass is always determined using a balance.
- Triple beam or electronic

- Remember you always must take into account the mass of the container one of two ways:
- Tare the balance (zero out the container’s mass)
- Or measuring the mass of the container and then subtracting it out later from the total mass of the container + substance

- Volume can be found in different ways, depending on the substance or object.

- Liquid volumes are read in volumetric lab equipment, like a graduated cylinder or pipet.

- The dimensions of regularly shaped objects may be measured and then the volume found by using a formula such as V=l x w x h.

- The volume of irregularly shaped objects may be found by water displacement
- measure a given amount of water in a graduated cylinder
- add the object and read the volume of the water + object
- then find the volume of the object by subtraction.

Amount of H2O with object = ______About of H2O without object = ______Difference = Volume = ______

Units water displacement

- Mass units are usually grams (g)
- Volume units are usually
- Milliliters (mL) or cubic centimeters (cm3)for liquids or solids
- 1mL = 1cm3

- L for gases

- Milliliters (mL) or cubic centimeters (cm3)for liquids or solids
- Density units will always be a
Mass unit like g/mL or g/cm3 or g/L

volume unit

Using the density formula water displacement

- D=m/v can be used to solve for density if the mass and volume is known
- What if the density is known, and you need to find the mass or volume?
- Just rearrange the formula to solve for the unknown
m=Dv or v=m/D

- Just rearrange the formula to solve for the unknown

examples water displacement

A 10.0mL sample of a sugar solution has a mass of 5.0g. What is the density of the sugar solution?

- A piece of metal has a mass of 114g and a volume of 10.0cm water displacement3. What is the density of the metal?

- A substance’s density is known to be 5.6g/ water displacementmL. You have a 25.0mL sample of the substance. What is the mass of the sample?

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