Please help with these 4 questions Use the following table to identify a metal i

Question

Please help with these 4 questions

Use the following table to identify a metal if 50.1J of energy is required to raise the temperature of 6.5 grams of the metal from 20°C to 40°C 6. Specific Heat Substance Capacity /g C) Lead Gold Silver Copper Iron Aluminum 0903 Ethanol Water 0128 0.128 0.235 0.388 0.449 242 4.184 What is the identity of the metal? a. Gold b. Lead C. Silver d. Copper e. Aluminum 7. A solution of saltwater can be classified as: a. b. c. d. e. A pure substance, compound A pure substance, element A mixture, homogeneous A mixture, heterogeneous None of the above 8. Which of the following pairs of elements do you expect to have similar properties a. Sulfur and Oxygen b. Sodium and Calcium c. Fluorine and Carbon d. Nitrogen and Oxygen e. Potassium and Bromine 9. What is the nuclear symbol for chlorine with 18 neutrons a. 171CI b. 31,CI c. 173sCI d. 3517CI

Explanation / Answer

6)

Given:

Q = 50.1 J

m = 6.5 g

Ti = 20 oC

Tf = 40 oC

use:

Q = m*C*(Tf-Ti)

50.1 = 6.5*C*(40.0-20.0)

C = 0.385 J/g.oC

This is specific heat capacity of copper

Answer: copper

7)

Salt water is mixture of salt and water.

Salt is solid and water is liquid. So, it is homogeneous

Answer: c

8)

Sulfur and Oxygen would have same properties as both are in same group (Group 16)

Answer: a

9)

Atomic number of Cl = 17

Use:

mass number = atomic number + number of neutrons

= 17 + 18

= 35

So, the symbol is 35 17 Cl

Answer: d

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