Answer:B
Explanation:
Below is attached an image of ozone and the resonance structures. Ozone is an angular (Bent) molecule as seen in the image below. It is best described by resonance structures as shown.
Answer: How far did you hold the magnet from the paper clip. How heavy is each paper clip.
Explanation: Close= Stronger Magnetism, just because he has more and is closer doesn't make his stronger than the other students. Weight also changes this.
Hope this helps.
Answer:
1.123x10⁻⁴ moles of alanine
Explanation:
In order to convert grams of alanine into moles, <em>we need to know its molecular weight</em>:
The formula for alanine is C₃H₇NO₂, meaning <u>its molecular weight would be</u>:
- 12*3 + 7*1 + 14 + 16*2 = 89 g/mol
Then we <u>divide the sample mass by the molecular weight</u>, to do the conversion:
- 1.0x10⁻² g ÷ 89 g/mol = 1.123x10⁻⁴ moles
Answer:
Modern model of the atom: c. The quantum-mechanical model
Historical: a. The plum-pudding model
b. The planetary model
d. Dalton's model of the atom
Explanation:
The model of the atom given by <u>quantum mechanics</u> is the most modern and complex, it is based on the mathematical form of the atomic structure. Quantum theory states that matter has properties associated with waves, which is why the model of the atom was based on this hypothesis. The so-called Uncertainty Principle determines that the electron does not have an exact position in atmospheric electricity, neither defined velocity nor direction.
Thomson proposed, in 1904, an atomic model known as the <u>plum pudding model</u>, according to which electrons were like negative 'plums' embedded in a 'pudding' of positive matter. It is a theory about the atomic structure, the atom is composed of negatively charged electrons in a positive atom.
Rutherford atomic model. For Ernest Rutherford, the atom was a <u>planetary electron system</u> revolving around a heavy atomic nucleus with a positive electrical charge. Electrons revolve long distances around the nucleus in circular orbits.
<u>
Dalton's atomic </u>theory is based on the following statements:
- Matter is made up of atoms, which are indivisible and indestructible particles.
- All atoms of the same chemical element are equal in mass and properties and different from the atoms of any other element.
Answer:
The atomic mass of an atom is the number of protons plus neutrons.
Fact: In case you get it confused with atomic number, atomic number is the number of protons in the atom.
Explanation: It could have been electrons plus neutrons since electrons equals protons but electrons aren't stable which is why it is protons and neutrons.
