Explain your answer. Water itself is an example of a homogeneous mixture. It often contains dissolved minerals and gases, but these are dissolved throughout the water. Is isopropyl alcohol (rubbing alcohol) a heterogeneous or homogenous mixture? Explain your answer.
Mixture contains two or more different substances which are only physically bonded. 3. Is tap water a heterogeneous or homogenous mixture? Explain your answer. Heterogeneous, It contains ions, dissolved gases, bacteria, etc.
A molecule in which the central atom forms three single bonds and has one lone pair is said to have a ________ shape. A) bent B) linear C) planar D) pyramidal E) tetrahedral 8. A bond where the electrons are shared equally is called a(an) ________ bond. A) polar covalent B) coordinate covalent C) nonpolar covalent D) ionic E) none of the above 9. In a precipitation reaction the insoluble product can be identified by the symbol ________.
Name: ___________________________________ Date: ______________ Practice Test #3 ____ 1. When a precipitation reaction occurs, the ions that do not form the precipitate A) evaporate B) are cations only C) form a second insoluble compound in the solution D) are left dissolved in the solution E) none of these 2. An aqueous solution of potassium chloride is mixed with an aqueous solution of sodium nitrate. The complete ionic equation contains which of the following species (when balanced in standard form)? A) B) C) D) E) ____ 3.
4) When naming an ionic compound, which ion is given first? The metal ion is named first 5) Give explanations for the following: a. Argon will not react with any other element It already has a complete number of eight, a full number in its valance shell so it cannot react with itself or another element b. The reaction between sodium chloride gives out a lot of heat and light. The chemical energy of the product is less then the chemical energy of the reactants. This energy is indestructible and is converted to light and heat.
high melting point, hard, brittle, slightly soluble in water, conductor of electricity when melted or in solution Molecular solid - crystalline solid that has molecules arranged in a particular configuration. low melting point, generally insoluble in water, nonconductor of electricity. Metallic solid - crystalline solid that has atoms of metals arranged in a definite pattern. low to high melting point, malleable, ductile, conductor of electricity, insoluble in most solvents. Lesson 13.6 Changes of physical state: * necessary to draw a temperature-energy graph to see the change in temperature with a constant application of heat Heat of fusion - the amount of heat required to melt 1.00 g of substance.
Mixtures can be classified as either homogeneous or heterogeneous. Homogeneous mixtures have the same composition throughout the mixture. Homogeneous mixtures are often called solutions. Vinegar and household ammonia are examples of homogeneous mixtures. Heterogeneous mixtures have varying composition throughout the mixture.
Atoms are the smallest basic units of matter, and are made of three subatomic parts. Protons, which are positively charged and identify the atom, are found in the nucleus. Then, there are neutrons; neutrons have no charge, and are also found in nucleus. This gives an atom it’s mass. Lastly, electrons are found on the energy rings and are negatively charged.
Exothermic and endothermic reactions. First law of thermodynamics and enthalpies of reactions. Calculate standard enthalpies of formations (using the equation on page 191). Electromagnetic radiation, photoelectric effect and continuous and line spectra. Energy levels and electron configurations (including representation using orbital diagrams) of several common elements on the periodic table.
The process of changing one element into another is called transmutation. The two main ways that a transuranic nucleus can be produced is by bombarding its nucleus with ions or neutrons. These ions or neutrons can be captured by the target nucleus and produce heavier nucleus. Transuranic element 1: U-238 is bombarded with neutrons it can be converted to U-239 which then undergoes beta decay to produce neptunium and plutonium. Pu-239 is changed to americium-241 by neutron