Energizer Flower Power

› SpongeBob loves to garden and wants to grow lots of pink flowers for his pal Sandy. He bought a special Flower Power fertilizer to see if it will help plants produce more flowers. He plants two plants of the same size in separate containers with the same amount of potting soil. He places one plant in a sunny window and waters it every day with fertilized water. He places the other plant on a shelf in a closet and waters it with plain water every other day.

› What did SpongeBob do wrong in this experiment? Explain.

› What should SpongeBob do to test the effectiveness of Flower Power fertilizer?

Energizer What is the difference between a

theory and a law? Theory

› An explanation for many hypothesis and observations› Explains an observation and helps predict what may

happen in the future› May change as new observations arise

Law› A summary of many experimental results› Tells you how things work› Tells you what will happen

Energizer Stacy decided to do an experiment to test

which brand of artificial sugar tasted the most like real sugar. In the experiment she tested three different brands Splenda, Equal and Stevia. She placed 5mL of each sweetener in 100 mL of plain water and had 20 people taste all 3. The taste testers had a sip of plain water in between each to cleanse their palate. As they tested each sample they rated the water from 1-5 (1 being most like sugar, 5 being least).› Name the independent variable,

dependent variable and at least 3 controls in Stacy’s experiment.

Energizer – 8/19/13

Please pick up all 7 sheets and a glue stick from the far counter. Try to keep them in order from left to right!

Don’t begin gluing anything until we start class!

Circle the items that you believe are matter:› Table

› Air

› Glass

› Sound

› Light

› Sand Write your own definition of what

matter is.

Is It Matter?

What is your definition??

Circle the items that you believe are matter:› Table

› Air

› Glass

› Sound

› Light

› Sand Now lets fix that definition…

Is It Matter?

Anything that has mass and take up space!

Matter:

Inertia An objects resistance to change in

motion› A change in motion could be moving

something or slowing something down Inertia is directly related to mass…the

more massive something is the harder it will be to change its motion.

Would it be easier to…

Stop a football player or toddler running down the field

Move a cargo ship or a sailboat Lift a full dresser or empty it out and

then lift it Slow down a single engine plane or a

commercial airliner› It is harder to stop or move things that

have greater mass or more inertia!

Density

A box has a volume of 300 cm3 and a mass of 800 grams. What is the density of the box?

The Metric System…Class Notes

The Metric System Is

The standard system used around the world by scientists.

We refer to it as the International System of Units or SI.

It is based on a system of decimals. It is used to measure length, mass,

volume, density and temperature.

Common Metric Units Kilo = 1000 Super Sized Hecta = 100 Bigger Deka = 10 Big Base Unit – Meter – Liter – Gram Deci = 0.1 Small Centi = 0.01 Smaller Milli = 0.001 Smallest

Remember: King Henry Died By Drinking Chocolate Milk

Mass

Measured in grams Mass measures the amount of matter

in an object (BUT NOT THE WEIGHT!) Measured using a triple beam balance

Weight

The measure of gravitational pull on an object.

Measured in newton's using a spring scale.

Mass vs. Weight

Mass The amount of

matter in an object Tool: triple beam

balance Unit: gram Constant no matter

where the object is located

Weight The amount of

gravitational pull on an object

Tool: spring scale Unit: newton Varies depending on

location

Mass and Weight: Similarities

As the mass rises so does weight We use both to describe the heaviness

of an object On earth these go up and down

together

Volume

Measured in Liters Volume is the amount of space an

object takes up 1 mL = 1cm3

Density The amount of mass in a given volume. Density = mass/volume

› g/mL Which is more dense?

Length

The distance from one point on an object to another

Measured in Meters The smallest unit of length is the

millimeter (mm). When would you use millimeters to measure length?

125 mm = ___ cm Largest unit of length is Kilometer,

what would you measure using the km?

Temperature

Measured in Celsius Water freezes at 0˚C and boils at

100˚C

Warm Up – 9/9 Which SI unit would you probably use

to express the height of your desk?

What would be the appropriate tool to use when measuring the mass of a spoon?

Ms. Gould is measuring small amounts of liquid chemicals out to be used in an experiment. Name the tool and SI unit that she is most likely using.

Metric Conversions

Since the metric system is a decimal system, it is easy to convert between units.

There are several methods to use:› The stair step method› Decimal Hopping› Factor Label Method

The Stair Step MethodKilo - k1000 units Hecto -

h100units

Deka - da 10

unitsBasic Unit (g, m,

L)Deci - d

0.1units Centi - c

0.01units

Milli - m0.001units

To convert to a larger unit, move decimal point to the left or divide.

To convert to a smaller unit, move decimal point to the right or multiply.

1.) 1000 mg = 1 g 3.) 109 g = ____ kg

2.) 160 cm = 1600 mm 4.)14 km = ____ m

Decimal Hopping

Once you master the stairs, decimal hopping should become easier. Since the metric system is set up by powers of ten all we have to do is move the decimal point to change units.

If you are moving to a LARGER unit move the decimal to the LEFT.

If you are moving to a SMALLER unit move the decimal to the RIGHT.

Example: smaller to larger

Moving to a larger unit…› 33 m = ____ km 1st place your decimal

point› 33. m = ____ km 2nd, how many places

away is km from m? Larger moves LEFT.› 33. m = ____ km

› 33. m = .033 km

Example: larger to smaller

Moving to a smaller unit…› 67.2 dm = ____ mm 1st the decimal is

placed, we will start hopping from that point

› 67.2 dm = ____ mm 2nd , how many places is dm from mm?

› 67.2 dm = ____ mm

› 67.2 dm = 6720 mm

Try Some…

460 L = ____ mL 90 cg = ____ kg 23.56 km = ____ hm

460 L = 460,000 mL 90 cg = .0009 kg 23.56 km = 235.6 hm

Another Method for Conversion…Factor Label

Sometimes it is not as easy as moving the decimal.

For instance when converting from pounds to kilograms we cannot just move the decimal› for these conversion we use the factor

label method.

Step 1:

Example: how many seconds are in 50 hours?

Put the known quantity in the upper-left space:50 hr

Step 2:

Put the conversion factor in the next set of boxes to the right. Make sure that units match diagonally:› 50 hr60 min› ____ 1 hr

Step 3:

Cross out, or cancel, the units that appear the same on both top and bottom:› 50 hr60 min› ____ 1 hr

Step 4:

Now ask, “is the unit that’s not crossed out the one that I want?”› If the answer is “yes,” then continue to

step 5› If the answer is “no;” return to step 2

› 50 hr60 min 60 sec› ____ 1 hr 1 min

Step 5:

To solve the problem, multiply the numbers on the top row.› 50 x 60 x 60 = 180,000

Then multiply the numbers on the bottom row› 1 x 1 x 1

› 50 hr60 min 60 sec› ____ 1 hr 1 min

Step 5 (cont.):

Now, divide the top row’s product by the bottom row’s product› 180,000 / 1 = 180,000 seconds

Ticket Out the Door

Use the factor label method to determine how many inches are in 20 miles.› 12 in = 1 foot› 3 feet = 1 yard› 5, 280 feet = 1 mile