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# Density Notes- Part 1 Chemistry 1 - PowerPoint PPT Presentation

Density Notes- Part 1 Chemistry 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

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### Density Notes- Part 1Chemistry 1

• 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 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

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

• 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

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?