. If you have 2 packages of chocolate Valentine\'s Day hearts, and each package

Question

. If you have 2 packages of chocolate Valentine's Day hearts, and each package weighs 900 milligrams (mg), what's the total weight of the 2 packages, in milligrams in kilograms (mg) (kg 2. Molly made 3600 milliliters (ml) of tea for a party, and she served the tea in 12 eups, with the same amount of tea in each cup. -How many liters (1) of tea were in each cup? ·If Molly spilled 50% of the tea before pouring, how many ml of tea would be in each cup, assuming she pours the same amount in each cup? m - 3. The electron transport chain part of photosynthesis takes 2 picoseconds. How many seconds is that? -How many times can the electron transport chain run in 10 seconds? seconds times 4. Each member of the U.S. Cross Country ski team skied 52 kilometers (km) over a period of four (4) days. There are 5 members on the ski team. - How many total km were skied by the whole ski team during the 4 days? - How many km did each skier travel each day? How many meters (m) did the whole team ski each day? km km 5. Assume you have 20,000 microorganisms per ml of saline solution in a tube (Tube #1) containing a total of 5 ml of buffered saline. You remove 0.5 ml, and add it to Tube #2 containing 4.5 ml of buffer. Finally, you remove 0.5 ml from Tube #2 and add it to Tube #3 containing 4.5 ml of buffer. How many total microorganisms are in the original tube? - How many total microorganisms are in Tube #2? microorganisms microorganisms How many microorganisms per milliliter (ml) are there in Tube #3? -How much have you diluted the microorganisms from Tube #1 to Tube #3? microorganisms

Explanation / Answer

1. The chocolates weigh 1800 milligrams ,

In kilograms

18 × 10-6 = 0.0018 kg

2.a. 3600 millilitres of tea, if filled in 12 cups we have,

3600/12 = 300 millilitres in each cup = 300 × 10-6 litres = 0.0003 litres

b. If Molly spilled 50% of the tea before pouring then the remains is 3600/2 = 1800 ml

then each cup will have 1800/12 = 150 ml

3. a.) 1 picoseconds = 10-12 seconds

If one electron transport chain takes 2 picoseconds, it is equal to 2 × 10-12 seconds

b.) It takes 2 × 10-12 seconds to complete one electron transport chain.

so in 10 seconds it can complete 10/ 2 × 10-12 = 5 × 1012times.

4. a.) If each member skied for 52 km in 4 days then all together they will have skied = 52 ×5 km = 260 km

b.) If each member skied for 52 km in 4 days then per day each member would have skied = 52/4 km = 13 km

c.) Total distance skied by the entire team in 4 days = 260 km = 260000 m

Then each day the entire team would have skied = 260000 / 4 m = 65000 m each day.

5. a.) Total microorganisms in the original tube = 20000 × 5 ml buffer saline = 100000 microorganisms

b.) In the original tube there are 20,000 microorganisms per ml

when 0.5 ml is moved to tube #2, the number of microorganisms in tube #2 = 20000/2 = 10000 microorganisms in 5 ml saline solution in tube #2

c.) Tube #2 has 10000 microorganisms. In 0.5 ml there will be = (10000/5) × 0.5 = 1000 microorganisms

So, in tube #3 there will be 1000 microorganisms in total.

Hence, in tube #3 per ml there will be = 1000/5 = 200 microorganisms per ml

d.) From 20000 microorganisms per ml it has been diluted to 200 microorganisms per ml

This means the number of microorganisms is reduced by 99% per ml.

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