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3 years ago

Which elements are considered "Noble Metals"?

Chemistry

1 answer:

Lisa [10]3 years ago

7 0

Answer:

ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), silver (Ag).

Explanation:

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If you were going to graphically determine the enthalpy of vaporization, δhvap, for this liquid, what points would you plot

Klio2033 [76]

It depends on what type of graph you have. The easiest would be using a H-T diagram. Enthalpy of vaporization is the physical change from liquid to vapor. It occurs at a constant pressure and a constant temperature. As shown in the picture, 1 point is drawn on the subcooled liquid, and another point of the saturated vapor isothermal line. Now, the difference between those two points is the value for the enthalpy of vaporization of water.

8 0

4 years ago

7. What determines what type of element an atom is?

frozen [14]

The amount of protons

3 0

3 years ago

1. Calculate the molar mass of the substances involved in the reaction

Nookie1986 [14]

The molar mass of a substance/chemical is the mass of the sample substance divided by the amount of substance in that sample.

Explanation:

In order to calculate the atomic mass of a substance we first obtain the atomic weight of the substance from the periodic table.
Then we count the number of atoms of the substance and multiply it with the individual atomic mass.

Molar mass of Citric Acid ( H3C6H5O7) is 192.1235 g/mol

It is calculated as :

Molar mass of C₆H₈O₇ = 6(atomic mass of C) + 8(atomic mass of H) + 7(atomic mass of O) = 6(12.0 g/mol) + 8(1.0 g/mol) + 7(16.0 g/mol) = 192.0 g/mol.

Molar mass of baking soda (NaHCO₃) is 84.0 g/mol

Molar mass of NaHCO₃ = (atomic mass of Na) + (atomic mass of H) + (atomic mass of C) + 3(atomic mass of O) = (23.0 g/mol) + (1.0 g/mol) + (12.0 g/mol) + 3(16.0 g/mol) = 84.0 g/mol.

3 0

3 years ago

A light twig is barely floating on the surface of water. What will most likely happen to the twig if a drop of dishwashing deter

horrorfan [7]

Answer;

- It will sink because soap disrupts the inter-molecular forces of water

Explanation;

-A light twig is barely floating on the surface of water. if a drop of dish washing detergent is added near it then it will sink because soap disrupts the inter- molecular forces of water.

-The twig was initially floating due to the force of surface tension created by the inter-molecular forces between water molecules. When soap is added to the water, the twig will be driven to sink by the disruption of the water's surface tension. This is because soap is a surfacant that is amphipathic and thus disrupts the inter-molecular forces between water molecules that are responsible for surface tension.

7 0

3 years ago

Balancing Equations Worksheet

kakasveta [241]

Answer:

1. N2+3H2=2NH3

2. CH4+2O2—>CO2+2H2O

3. P4+3O2—>2P2O3

4. 2H2+2NO—> N2+2H2O

5. 2Na+Cl2—>2NaCl

6. TiCl4+4Na—>4NaCl+Ti

7. S8+12O2—>8SO3

8. 2KClO3 —> 3O2 +2KCl

9. Na3PO4 + Fe(NO3)3 —> FePO4 + 3NaNO3

10. 3Ca(OH)2 + 2H3PO4 —> Ca3(PO4)2 + 6H2O

11. HNO3 + NaHCO3 —> NaNO3 + H2O + CO2 (The equation is balanced)

12. 2H2O2 —>2H2O + O2

13. C3H8 + 5O2 —> 3CO2 + 4H2O

14. 6H2O + 6CO2 —> 6O2 + C6H12O6

15. 2AgNO3 + Cu —> Cu(NO3)2 + 2Ag

16. CBr4 + 2Cl2 —> CCl4 + 2Br2

17. Cu + 2H2SO4 —> CuSO4 + 2H2O +SO2

18. 3Na2S + 2Fe(NO3)3 —> Fe2S3 + 6NaNO3

19. Pb(OH)2 + 2HCl —> 2H2O + PbCl2

20. 2AlBr3 + 3K2SO4 —> 6KBr + Al2(SO4)3

21. 2Na3PO4 + 3CaCl2 —> 6NaCl + Ca3(PO4)2

22. 2Al + 6HCl —> 3H2 + 2AlCl3

23. 2NH3 + H2SO4 —> (NH4)2SO4

24. 2C8H18 + 25O2 —> 16CO2 + 18H2O

25. CaCO3 + 2HCl —> H2O + CO2 + CaCl2

26. Na2O + H2O —> 2NaOH

27. 2NaHCO3 —> H2O + CO2 + Na2CO3

28. P4 + 3O2 —> 2P2O3

29. Fe(NO3)3 + 3NaOH —> Fe(OH)3 + 3NaNO3

30. 2Na + 2H2O —> H2 + 2NaOH

31. Na2SO3 + 2HCl —> H2O + SO2 + 2NaCl

32. 2Zn + 2Cu(NO3)2 —> Cu2 + 2Zn(NO3)2

33. 2C2H2 + 5O2 —> 4CO2 + 2H2O

34. H2SO4 + 2KNO2 —> 2HNO2 + K2SO4

35. Cu + 4HNO3 —> Cu(NO3)2 + 2NO2 + 2H2O

36. 3I2 + 6NaOH —> 5NaI + NaIO3 + 3H2O

I hope I helped you ^_^

7 0

3 years ago