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3 years ago

I WILL GIVE 25 POINTS!! PLZ HELP ME!! Chemistry questions!

Chemistry

2 answers:

cupoosta [38]3 years ago

8 0

Answers:

1)Which of the following formulas represents a molecular (i.e. covalent) compound?

B. H₂O

Explanation: CaCl, NaOH and LiF are ionic compounds. In H₂O the bonds between atoms are covalent bonds.

2)According to the Aufbau principle,

A. electrons enter orbitals of lowest energy first.

Explanation: Aufbau principle explains how the electrons are located in the different orbitals, starting with the first level of lowest energy to the last level as follows:

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹⁴5d¹⁰6p⁶7s²5f¹⁴6d¹⁰7p⁶

3)26.8 moles of argon contain how many atoms?

D. 1.61 × 1025 atoms

Explanation:

1 mol = 6.022 ₓ 10²³ atoms

atoms= 26.8 mol ₓ 6.022 ₓ 10²³ atoms/mol = 1.61 × 10²⁵ atoms

4)Group 17 (i.e. 7A) elements have _________ electron(s) in their valence shell.

C. 7

Explanation: in Group 17 are the halogen elements, which have 7 electrons in their valence shell, with an electronic configuration 1s² 2p⁵ (two electrons in s orbital and 5 electrons in p orbital)

5)In which of the following is the symbol for the ion and the number of electrons it contains given correctly?

K+; 18 electrons

Explanation: the atomic number of potassium element (K) is 19, so its number of electrons is 19. To form the cation K⁺, it must loss 1 electron to have 1 positive charge. The remaining electrons after losing an electron is 18.

6) In metallic bonding, the electrons

D. are in a "sea" around the protons of all the metal atoms.

Explanation: metallic bonding exists in metals (such as Fe, Ni, Cu). The electrons are not located in one particular atom, but they can move from one atom to another by forming a mass or "sea" of electrons surrounding the protons. For this reason, metals can conduct electricity.

Studentka2010 [4]3 years ago

5 0

1-b
2-a
3-idk
4-c
5-idk
6-idk

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