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olga_2 [115]
3 years ago
15

Use your periodic table to answer the following questions. Pay attention to the spelling of the element names and make sure to w

rite the chemical symbols correctly. 1. What metal is found in the group 1 and period 4? __________________ 2. What metalloid is found in the group 16 and period 5? ______________ 3. What nonmetal is found in the group 17 and period 2? ______________ 4. In what group will you find copper? ____________________ 5. In what group will you find krypton? ____________________ 6. In what group will you find mercury? _______________________ 7. What is the symbol for chlorine? ___________________ 8. What is the symbol for lead? _____________________ 9. What is the symbol for tungsten? ______________________ 10. What is the symbol for antimony? _______________________ 11. What is the symbol for sodium? ______________________ 12. In what period will you find gold? __________________________ 13. In what period will you find silver? _________________________ 14. In what period will you find oxygen? _________________________ 15. In what groups will you find metalloids? ______ ______ _____ _____ 16. What element has the symbol H? _______________________ 17. What element has the symbol He? _______________________ 18. What element has the symbol Ca? ________________________ 19. What element has the symbol Co? ________________________ 20. What element has the symbol C?
Chemistry
1 answer:
Novay_Z [31]3 years ago
3 0

Explanation:

1. K (Potassium)

2. Te (Tellurium)

3. F (Flourine)

4. group 11, period 4

5. group 18, period 4

6. group 12, period 6

7. Cl

8. Pb

9. W

10. Sb

11. Na

12. period 6, group 11

13. period 5, group 11

14. period 2, group 16

15. Groups 13–16 of the periodic table contain one or more metalloids

16. Hydrogen

17. Helium

18. Calcium

19. Cobalt

20. Carbon

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The rate constant (K) is related to activation energy (Ea), frequency factor (A) and temperature (T) in Kelvin by the equation

R = molar gas constant

K = A(e^(-Ea/RT))

Taking natural log of both sides

In K = In A - (Ea/RT)

In K = (-Ea/R)(1/T) + In A

Comparing this to the equation of a straight line; y = mx + c

y = In K, slope, m = (-Ea/R), x = (1/T) and intercept, c = In A

a) From the question, m = (-Ea/R) = -1.10 × (10^4) K

(-Ea/R) = -1.10 × (10^4) = -11000

R = 8.314 J/K.mol

Ea = -11000 × 8.314 = 91454 J/mol = 91.454 KJ/mol

b) c = In A = 33.5

A = e^33.5 = (3.54 × (10^14))/s

c) K = A(e^(-Ea/RT))

A = (3.54 × (10^14))/s, Ea = 91454 J/mol, T = 25°C = 298.15 K, R = 8.314 J/K.mol

K = (3.54 × (10^14))(e^(-91454/(8.314×298.15))) = 0.0336/s

QED!

3 0
3 years ago
Which statement is true for nuclear reactions but not for chemical reactions?
IrinaVladis [17]

Answer:maybe C

Explanation:

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2 years ago
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Answer:

The correct answer is C. element

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The sample cannot be an element because an element - or <em>elemental substance</em> - cannot be decomposed into simpler substances. Thus, it cannot be composed by differents types of atoms. For example, an element is carbon (C).

As the sample contains <u>three types of atoms</u>, it can be a compound, a molecule or a mixture, because they can be composed by different types of atoms - of different chemical elements. For example, the sample could contain the element carbon (C) combined with other elements, for example oxygen (O) or hydrogen (H), amoing others.

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Answer:

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Explanation:

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B.

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