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Law of Conservation of Mass - No detectable gain or loss in mass occurs in chemical reactions. However, the state of a substance may change in a chemical reaction. For example, substances involving in a chemical reaction can change from solid states to gaseous states but the total mass will not change. Note that the energy released (exothermic) or adsorbed (endothermic) in a chemical reaction is a result of energy transfer between atoms and their environment.
Law of Definite Proportion - The elements in a given compound are always combined in the same proportion by mass. This law forms the basis for the definition of a chemical compound. For example, a water molecule (H2O) consists of two hydrogen atoms each of relative mass of 1 and one oxygen atom of relative mass of 16 (rounded to nearest integer number). By putting a sensible unit measurement this means that there are 2 g of hydrogen and 16 g of oxygen in a sample of 18 g of water. The ratio is 1 to 8. Thus, a sample of, say, 51.435 g of water always contain (51.435 x 1/9) 5.715 g of hydrogen and (51.435 x 8/9) 45.720 g of oxygen. The ratio, again, is 1 hydrogen to 8 oxygen. This rule applies for water found anywhere in the universe and the mass proportion is always the same for any given unit measurement (kilogram, pound etc.).
Law of Multiple Proportion - Whenever two elements form more than one compound, the different masses of one element that combine with the same mass of the other element are in the ratio of small whole numbers. Take an example of two mineral samples iron pyrite (FeS2) and iron troilite (FeS). Both contain iron and sulfuratoms. However, for a given fixedamount of iron it requires exactly twice the mass of sulfur needed to make pyrite than that of troilite with the same amount of iron.
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What are the three main points to John Daltons atomic theory?
All matter is made up of tiny, indivisible particles called atoms. Atoms of the same element are identical in size, mass, and properties, while atoms of different elements differ in these aspects. Chemical reactions involve the rearrangement of atoms, but atoms are neither created nor destroyed in chemical reactions.
What elements on the periodic table are usually identified with three things?
Elements such as oxygen, silicon, and carbon are commonly associated with three things: atomic number, atomic mass, and chemical symbol. These properties help uniquely identify each element on the periodic table.
What are the main three parts of an electrons used in the current atomic theory that describe an electrons location?
An electron configuration shows the distribution of electrons among the subshells. Each number shows the principal quantum number, or shell, the subshell and finally the orbital of the electron.
Which two of the three statements that make up Dalton's atomic theory are no longer regarded as true?
The two statements that are no longer regarded as true in Dalton's atomic theory are: 1. Atoms are indivisible and indestructible (we now know that atoms can be divided into subatomic particles and can undergo nuclear reactions) and 2. All atoms of a given element are identical in mass and properties (we now know that isotopes exist, leading to variations in mass).
Use the Molecular orbital theory to describe covalent bonding?
A commo approach is LCAO, linear combination of atomic orbitals. This gives rise to molecular orbitals and is a technique with particular strengths in determining bond energies rather than bond location. For exampel a simple moleculae such as methane in MO theory is predicted to have four bonding orbitals- where one has a lower energy than the other three and this is borne out by spectrocopy. this is a different insight to that provided by traditional valence bond theory which predicts four equivalent bonds to hydrogen.
Name three observations made by Herry Hess to support his theory?
he was born in Arizona
Which two of the three statements that make up Dalton's atomic theory are no longer regarded as true as stated by Dalton's?
All the atoms in elements are not a like
What is the three theory?
the three date theory is a theory that after 3 dates the girl will put out.
What is the three date theory?
the three date theory is a theory that after 3 dates the girl will put out.
What three types of evidence provided support of the theory of sea-floor spreading?
three are : eruptions of molten material magnetic stripes in the rock of the ocean floor and the ages of the rocks themselves :)
What three types of evidence provided support of the theory of sea floor spreading?
three are : eruptions of molten material magnetic stripes in the rock of the ocean floor and the ages of the rocks themselves :)
What are three forms of evedence used to support th big bang theory?
Three important pieces of evidence are:* The redshift of distant galaxies. This means that galaxies are moving away from us. * The percentages of elements and isotopes. This closely matches predictions from theory. * The cosmic background radiation. This, too, closely matches predictions from theory.
When was Three Essays on the Theory of Sexuality created?
Three Essays on the Theory of Sexuality was created in 1905.
What are three examples of theory?
the theory of evolution, general relativity, quantum theory
Which theory is a reworking of Maslow's need hierarchy and is better supported by additional research than is Maslow's theory?
Self-determination theory is a reworking of Maslow's need hierarchy theory and has gained stronger empirical support. It emphasizes three basic psychological needs: autonomy, competence, and relatedness, which are essential for intrinsic motivation and well-being.
Does the atomic number change in the three isotopes of hydrogen?
No the atomic number is same for the three isotopes of hydrogen (it is 1). The three isotopes of hydrogen differ by the number of neutrons.
What are the three natural phenomena that support the kinetic?
The three natural phenomena that support the kinetic molecular theory are diffusion (movement of particles from high concentration to low concentration), Brownian motion (random motion of particles in a fluid medium), and pressure (resulting from particles colliding with the walls of their container).
