Mass, Volume & Density

Matter All objects are made of matter. Matter is anything that has mass and takes up space! Matter is made of particles called atoms which are too small to see. (Copy into notes)

Not Everything is Matter Light and sound are not matter Light does not take up space or have mass in the way a table does Air is made up of atoms, but a sound traveling through air is not made of atoms (Copy into notes)

Mass Mass is a measure of how much matter an object contains Standard unit of mass is the kilogram (kg) Smaller masses are usually measured in grams (g) (Copy into notes)

Weight Weight is the downward pull of an object due to gravity Weight is measured using a scale, such as a spring scale Standard unit for weight is the newton (N) Common unit for weight is the pound (lb) (Copy into notes)

Volume Volume is a measure of the space matter occupies Matter takes up space, therefore, matter has volume Matter can be measured by displacement or using the volume formula (Copy into notes)

Volume of Well-defined Shapes Volume = length •width •height Volume is measured in cubic units All measurements must be in the same unit to calculate the volume using the formula (Copy into notes)

Finding the Volume Find the volume of a pizza box that is 8 cm high, 38 cm wide, and 38 cm long. (Complete the problem)

Using the Formula A bar of gold is 10 cm long, 5 cm wide, and 7 cm high. What is its volume? (Complete the problem)

Converting Metric Units Use King Henry to help you convert from one metric unit to another metric unit King Henry Doesn’t Usually Drink Chocolate Milk (KHDUDCM) – (Copy into notes) K – kilo H – hecto D – deka U – units (grams, meters, liters) D – deci C – centi M - milli

Converting Metric Units Use King Henry – (complete problem) Convert 25 mg to kg KHDUDCM Start at the m Determine which direction you are moving Determine how many places you are moving Move the decimal point in the direction determined, the number of places determined

Converting Metric Units (Complete problem in notes) Convert 25 mg to kg KHDUDCM You are moving to the left You are moving 6 places 25 mg would be .000025 kg

Practice Conversions Convert 58.9 hL to cL

More Practice! Convert 12 g to mg

Last One! Convert 986 daL to cL

One More Try! What is the volume of a large block of wood that is 1 m long, 0.5 m high, and 50 cm wide? Remember, you have to have the same units when calculating volume!

Volume by Displacement Irregularly shaped objects’ volume can be measured by water displacement using a graduated cylinder First, add water to the graduated cylinder and note its volume Next, submerge the irregularly shaped object and note the new volume with the object Subtract the initial volume from the volume with the object included to find the volume of the object (Copy into notes)

Volume by Displacement Volume by displacement is measured in milliliters (mL) 1 milliliter is equal to 1 cubic centimeter 1 mL = 1 cc or 1cm3 Be sure to read the volume of the liquid at the bottom of the curve, which is called the meniscus. (Copy into notes)

Volume by Displacement What is the volume of the object? – Solve in notes

Another One! What is the volume of the object shown? – Solve in notes

Last One! What is the volume of the object depicted below?

Density Density – is a measure of the amount of matter present (mass) in a given volume of a substance To calculate the density of an object, you divide the mass of the object by its volume D = m/v Standard unit of measure for density is g/cm3 or g/mL (Copy into notes)

Calculating Density Use the formula: d = m/v to find the density of a marble whose volume is 5 cm3 and a mass of 13 grams. – Complete problem in notes

Your Turn! A lead sinker has a mass of 227 grams and a volume of 20 cm3 . What is the density of lead? (Complete problem in notes)

Another One! A glass of milk has a volume of 100 mL. If the milk has a mass of 103 grams, what is the density of milk? – Complete problem in notes