Double displacement reaction: Chemical reactions in which one component each of both the reacting molecules is exchanged to form the products. 3. What does the stoichiometry of a chemical reaction mean? Why is it important? Stoichiometry is a section of chemistry that involves using the relationships between reactants or products in a chemical reaction to determine the desired quantitive data.
The hydrogen molecule consists of two protons held together by a pair of electrons. These forces just balance when the nuclei are a particular distance apart. Co-ordinate bonding A single covalent bond consists of a pair of electrons shared between two atoms. In most covalent bonds, each atom provides one of the electrons. But, in some Bonds, one atom provides both the electrons.
Energy levels and electron configurations (including representation using orbital diagrams) of several common elements on the periodic table. Identify groups and periods of elements on the periodic table, and know the trends of reactivity, atomic size, ionization energy, and electron affinity within a group or period. Page 297 - 320; page 325 – 329; page 341 – 350 and page 353 – 359; page 393 – 420; * Chemical bonding and Lewis structures. Molecular geometry. Gases (concepts and problem
Each of these types of reactions behaves in a similar fashion. They all involve the conversion of one substance to another substance, while preserving the original elements in some form. Another aspect of predicting products is the chart of reactivity. In order for the replacement of an element in a compound to happen, the element replacing the original element must be more reactive. The chart of reactivity tells chemists the comparable reactivity of elements.
HSC Chemistry Assessment task 1 Nuclear Chemistry Research report 1. Distinguish between stable and radioactive isotopes and describe the conditions which a nucleus is unstable. To understand if an element is stable we first must understand what stability is. The stability of the nucleus is directly related to the strength of the forces that hold the nuclear particles together. These protons and neutrons of the nucleus are called nucleons.
Heats of Solution and Reaction Name: Cindy Hernandez Purpose: The purpose of this experiment is to decided if the chemical reactions are exothermic and endothermic. By finding the differences between each temperature. Overview: For this lab, we had three different chemicals involved NH4Cl, H2SO4, and NaOH. What we did with these chemicals was that we added water, except NaOH we added HCl, was that we combined both mixtures to determine if there was a temperature change. The reason why we're determining if their was a chemical reaction is to identify if it is exothermic or endothermic.
ABSTRACT: The lab of “observations of chemical changes” was to observe the changes that occur in chemical reactions and attempt to interpret these changes. In these experiments it taught me how to interpret chemical reactions with acids and bases. Also, how one chemical can have many different reactions when combined with other chemicals and how to interpret each reaction as what it could mean. I discovered not only how to measure out a well-balanced chemical combination to receive a reaction but to know how to test for acids and bases using a few different methods. Other tests also included in this experiment were testing for Sodium Bicarbonate, and Starch.
Final exam chem 2014 Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. A central concept of the kinetic theory, one of the “big ideas” of chemistry, is the belief that a.|for every reaction there is an equal and opposite reaction.| b.|chemical reactions involve processes in which reactants produce products.| c.|the particles in matter are in a state of constant motion.| d.|every chemical process uses or produces energy, often in the form of heat.| ____ 2. In a chemical reaction, the type of products obtained is largely determined by which part of the reacting chemicals? a.|protons| b.|electrons| c.|neutrons| d.|nuclei| ____ 3.
When two different atoms are bonded together, each attracts the electrons differently like a tug-of-war between two unequal teams, producing a dipole. The positive part of one molecule is then attracted to the negative part of another molecule. The shape of a molecule also contributes to the formation of a dipole. Molecules containing three or more atoms may be linear in shape or bent. Depending on how symmetrical or how bent the molecule is, the formation of a dipole in molecules will differ.
As Model Science (2011) explains, the experiment will show that as the salt with the metal is “burned, the electrons will be excited (i.e., move to another energy level) and as these electrons fall back from one energy level to another, they will emit photons of light. These photons will have different colors depending on the element and its discrete energy levels”. In other words, “different wavelengths of light (colors) will be emitted when the electrons of different elements go down the step(s) between their energy level(s). In addition, each element will have its own set of energy levels and therefore each will have its own color or set of colors (Model Science, 2011)”. As an example, Model Science (2011) provided “sodium burns orange, potassium -purple/blue, barium - green, and lithium – red”.