# Atoms, Dimensional Analysis, and the Scientific Method

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Week 1 Assignment (20 points)

For the two problems given below, show ALL work and always write appropriate units at all times

1. You have samples of 3 different dandelion poisons. They cost \$10 a gallon, \$20 a gallon and \$30 a gallon respectively. You would like to determine which one is the most effective. State your hypothesis, design an experiment, and state a result that would support your hypothesis. (1 point)

2. If a medicine has a dosage of 20 ml, how many doses are in a 4 gallon bottle? (1 point)

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3. If you have a car that gets 30 miles to the gallon and fuel currently costs \$2.60 a gallon, how many miles can you drive if you have 5\$ worth of fuel? (1 point)

4. Aluminum has a density of 2.7 g/cm3, how much space in cm3 would 100 grams of aluminum occupy? (1 point). Show all work.

5. Give the masses, charges, and names of the 3 subatomic particles. (1 point for each row: 3 points total).

Name

Mass

Charge

6. Explain what an atom is and how it is structured. 1 point.

7. 2.92 inches = _______________ cm (1 point)

8. 16500 µl = _________________ gallon (1 point)

9. If the density of a metal bar is 3.47 g/mL and volume is 30 mL, calculate the mass of the metal bar in kilogram (kg). (1 point)

10. I. Identify the following as physical or chemical properties. (3 points, 0.5 point each)

a. Mercury is a liquid metal.

b. Some nonmetals are gaseous.

c. Salt is the product of a reaction between acid and base.

d. Density of water is 1.0 g/mL.

e. Members of noble gas family are inert.

f. CO2 is combined with water to form glucose in photosynthesis.

11. If an atom contains 18 protons and 20 neutrons, its atomic number is _______________ and mass number is _______________. It has _________________ electrons. Show calculation where applicable. Identify the element and write its full name and chemical symbol. (0.5 points a blank 1.5 points total)

12. If an atom contains 2 protons and 5 neutrons, its atomic number is _______________ and mass number is _______________. It has ___________________ electrons. Show calculation where applicable. Identify the element and write its full name and chemical symbol. (0.5 points a blank 1.5 points total)

13. Complete the following Table based on information given about the element Boron. (0.75 points each row, 3 points total).

Number

Element

Atomic Number

Mass Number

Atomic mass

1

Boron with 5 neutrons

2

Boron with 6 neutrons

3

Boron with 7 neutrons

4

Boron with 8 neutrons

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