charge. Correct See Section 2.2: How Do Atoms Bond to Form Molecules? Points Earned: 1/1 Correct Answer: A Your Response: A 2. Hydrocarbons are _______ and _______‚ whereas salts are _______ and _______. A. nonpolar; hydrophobic; polar; hydrophilic B. nonpolar; hydrophilic; polar; hydrophobic C. polar; hydrophilic; nonpolar; hydrophobic D. polar; hydrophobic; nonpolar ; hydrophilic E. None of the above Correct See Section 2.2: How Do Atoms Bond to Form Molecules? Points Earned:
Premium Atom Water Chemical bond
of decomposition‚ a neutron in the nucleus decomposes to form a proton‚ which is retained in the nucleus‚ and an electron‚ which is expelled from the atom. Which change describes a process of this sort? A 11C 12C B 22Na 22Ne C 32P 31P D 40K 40Ca 5. How many electron pairs‚ with principal quantum number n = 3‚ can be accommodated in an atom? A 6 B 9 C 14 D 18 6. The first ionisation energies‚ in kJ mol-1‚ of Group II and III elements are given below: Group II Group III
Free Atom Chemical element Quantum mechanics
to the mass of the smallest known atom. They were all found to be identical despite their origin. Some scientists speculated as to their purpose in the universe. Some though them to be the fundamental building block of the universe. They name for these beta rays was soon replaced by the name electron. The English physicist by the name of JJ Thomson‚ discovered the electron in 1897. He was certain that every atom consisted of electrons. He deduced that since an atom contains a neutral charge and consists
Free Electron Electric charge Atom
An ion is an atom or molecule in which the total number of electrons is not equal to the total number of protons‚ giving it a net positive or negative electrical charge. The name was given by physicist Michael Faraday for the substances that allow a current to pass ("go") between electrodes in a solution‚ when an electric field is applied. It is from Greek ιον‚ meaning "going." The word ion also is responsible for electrical current being symbolized by the letter i in chemistry and physics. An anion
Premium Ion Atom
Ernest Rutherford is the man behind the discovery of the central charge in a nucleus. This significant finding changed scientists view on atoms The discovery of the nucleus is one of‚ if not the most important to have ever been made. In this essay I will be discussing how previous assumptions of the atom’s shape‚ curiosity and an accident led to Rutherford’s discovery of the proton. Data and equations from his original journal will also be discussed to further prove the presence of a central charge
Premium Atom Physics Chemistry
Unsaturated Hydrocarbons Unsaturated hydrocarbons Have fewer hydrogen atoms attached to the carbon chain than alkanes. Are alkenes with double bonds. Are alkynes with triple bonds. 1 Structure of Alkenes Alkenes (and alkynes) are unsaturated hydrocarbons Alkenes have one or more double bonds The two bonds in a double bond are different: - one bond is a sigma () bond; these are cylindrical in shape and are very strong - the other is a pi (π) bond; these involve sideways overlap of
Free Benzene Hydrocarbon Alkene
the atom was once extremely limited. As time passes‚ we begin to discover more and more about the world we live in. We have come to know much about the atom over the past two hundred years through the work of numerous brilliant scientists. Throughout history‚ scientists have come up with many experiments and atomic models to explain the atoms all around us‚ all leading up to our modern understanding. The Greek philosopher Democritus (460 BC- 370 BC) was first to infer the existence of atoms. Democritus
Free Atom Electron Neutron
particles called atoms. * Write the symbols and names of the following elements: H‚ He‚ Li‚ Be‚ B‚ C‚ N‚ O‚ F‚ Ne‚ Na‚ Mg‚ Al‚ Si‚ P‚ S‚ Cl‚ Ar‚ K‚ Ca‚ Ti‚ V‚ Cr‚ Mn‚ Fe‚ Co‚ Ni‚ Cu‚ Zn‚ Br‚ Sr‚ Ag‚ Sn‚ I‚ Ba‚ Pt‚ Au‚ Hg‚ Cd and Pb. * List the relative charges and relative masses (on the atomic mass scale) of the fundamental particles - protons‚ neutrons and electrons. * State that atoms have a dense positively
Premium Atom Chemistry Electron
is loosely held and it is easy for the elctron to be released to form stable octet lectron arrangement. The reactivity of G1 is the tendency of the atom to release elctron to form stable electron arrangement. The easierm the atom releases electron‚ the more reactive it is. ELECTROPOSITIVITY The electropositivity of G1 is the tendency of the atom to release electron to form stable electron arrangement. As the size increases going down the group‚ the valence gets further away from the nucleus.
Free Atom Electron
Intermolecular Forces Intermolecular forces are forces of attraction or repulsion which act between neighboring particles (atoms‚ molecules or ions). They are weak compared to the intramolecular forces‚ the forces which keep a molecule together. There are a few types of attractive intermolecular forces such as: Dipole-Dipole Forces Dipole–dipole interactions are electrostatic interactions of permanent dipoles in molecules. These interactions tend to align the molecules to increase the attraction
Premium Atom Chemical bond Covalent bond