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[answered] 1. If someone wanted to build a scale model of the atom wit


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1. If someone wanted to build a scale model of the atom with a nucleus

 

1.00 m in diameter, how far away would the nearest electron need to

 

be?

 

2. In the chemical reaction of the combustion of ethane C2H6, what are

 

the reactants? What are the products? Write the balanced equation of

 

the combustion.

 

3. Complete the following table using the periodic table of elements:

 

Element Chemical Atomic Number

 

Number

 

Symbol

 

Weight of protons of

 

neutrons Iron

 

Na Number Number of

 

of

 

electrons on

 

electrons the outer shell

 

26 11 Category Number

 

of shells

 

4 1 Chlorine 3

 

As 5

 

84 Noble gas 4. Aspirin (C9H8O4) is an analgesic (painkiller) and antipyretic (fever

 

reducer). What is the molar mass of aspirin? Show your work.

 

5. Radioactivity and Half-Life: what convincing evidence is there that

 

radioactivity is a nuclear effect and not an atomic effect (explain both

 

expressions first)? How does the charge of a nucleus change with beta

 

decay? How does the mass of a nucleus change with alpha decay? If

 

uranium is radioactive and decays, why does it occur naturally on

 

Earth? PART III: MULTIPLE CHOICE Circle the right answer:

 

1- Who developed the periodic table?

 

a- Bohr b- Newton

 

c- Mendeleev

 

d- Boyle

 

2- Consider the element Argon. Which statement is true?

 

a- It is in group 2B

 

b- It is a halogen

 

c- It has 4 electrons on the outer shell

 

d- It is a noble gas

 

3- An object with a deficiency of electrons is:

 

a- neutral

 

b- positively charged

 

c- negatively charged

 

d- it depends of its surroundings

 

4- Which statement refer to a chemical property?

 

a. Balsa is a very light wood.

 

b. If held in a ?ame, magnesium metal burns in air.

 

c. Mercury has a density of 13.6 g/ml.

 

d. Human blood is red.

 

5- Which of the following represents a chemical change?

 

a. Metal expanding when heated.

 

b. Dry ice, solid carbon dioxide, undergoing sublimation.

 

c. The burning of gasoline.

 

d. Ice melting

 

6- In one molecule of Calcium Phosphate (Ca3(PO4)2), there are

 

a. 8 atoms of Oxygen

 

b. 8 atoms of Phosphorus.

 

c. 6 atoms of Calcium

 

d. 2 atoms of PO4.

 

7- Isotopes of a chemical element have the same number of

 

a. Electrons

 

b. Nucleons

 

c. Protons

 

d. Neutrons

 

8- The type of bonds formed between atoms depends upon

 

a. The total number of electrons

 

b. The number of nucleons in the nucleus c. The number of electrons on the outer shell only

 

d. The number of protons in the nucleus

 

9- Photosynthesis and respiration are examples of

 

a. Combination reactions

 

b. Oxidation Reduction reactions

 

c. Decomposition reactions

 

d. Combustion reactions

 

10- Avogadro number is used for the calculation of the

 

a. Coulomb force

 

b. Magnetic attraction

 

c. Bond electronegativity

 

d. Number of atoms in a mole of atoms SEE LAB MANUEL TO COMPLETE THE FOLLOWING QUESTIONS

 

PG 59-64

 

1. Define enthalpy. 2. What is the relationship between the enthalpy of a reaction and its classification as

 

endothermic or exothermic? Time (sec)

 

3. With instant hot compresses, calcium

 

chloride dissolves in water and the

 

temperature of the mixture increases. Is

 

this an endothermic or exothermic

 

process? Temp. (?C) Initial

 

30

 

60

 

90

 

120

 

150

 

180 Experiment 1: Cold Packs vs. Hand

 

Table 1: Cold Pack Data

 

Warmers 210 Table 2: Hand Warmer Data 240

 

270

 

*300

 

330

 

360

 

390

 

420

 

450

 

Maximum Temp (?C): Time (sec) Temp. (?C) Initial

 

30

 

60

 

90

 

120

 

150

 

180

 

210

 

240

 

270

 

*300

 

330

 

360

 

390

 

420

 

450

 

Minimum Temp (?C): Graph your data from the tables. You may create the graph on any program, but make

 

sure it can be integrated into this document. Questions 1. Calculate the overall temperature change for the cold and hot pack substance. HINT: This is the

 

difference in the maximum temperature and minimum temperature of each.

 

Cold pack ?T: Hand warmer ?T: 2. Which pack works by an exothermic process? Use experimental data to support your answer. 3. Which pack works by an endothermic process? Use experimental data to support your answer. 4. Which pack had the greatest change in enthalpy? How do you know?

 


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