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❶Most decomposition reactions cannot take place without the use of heat, electricity, or light.


physical science homework help answers
Physical Science Answers

Question 1 Multiple Choice Worth 1 points [ Neither can change the number of atoms of each element that are present. Neither can cause chemical bonds to break. Neither can result in a phase change. Neither can cause a substance to give off heat or light. Question 2 Multiple Choice Worth 1 points [ They form potassium chloride KCl and water H2O.

What type of reaction is this? How do you know that this is a chemical change? Chemical bonds in the water molecule are broken.

There is a phase change from liquid to gas. Electrical current always causes a chemical change. It is a single replacement reaction. Question 8 Multiple Choice Worth 1 points [ What forms of heat transfer are acting to transfer heat from the fire to your skin? Which disproves this student's statement? Exothermic reactions often produce light. Conduction cannot occur in a liquid. Gases often rise from the surface of a reaction.

Convection currents form during chemical reactions. Question 10 Multiple Choice Worth 1 points [ Which of the following must be true of photosynthesis? The reaction can take place only if energy is added. The reactants are oxidized. The photosynthesis reaction produces ions. The molecular bonds in carbon dioxide are very weak. Question 11 Multiple Choice Worth 1 points [ He thinks that by finding the right catalyst, he can get them to react.

Why is the chemist incorrect? Catalysts can only increase the rate of reaction for compounds that do react. Only an inhibitor can cause two compounds to react. Lesson 7 - The Law of Conservation of Mass: Lesson 9 - Four Quantum Numbers: Lesson 10 - The de Broglie Hypothesis: Lesson 11 - Ionic Bonds: Lesson 13 - Polar and Nonpolar Covalent Bonds: Lesson 15 - What Are Elements? Lesson 1 - The Periodic Table: Properties of Groups and Periods. Lesson 3 - Atomic and Ionic Radii: Lesson 4 - Ionization Energy: Lesson 5 - Electronegativity: Lesson 7 - Transition Metals vs.

Lesson 8 - What is Antimony? Lesson 1 - Chemical Bonds I: Lesson 2 - Chemical Bonds II: Lesson 4 - Chemical Bonds IV: Lesson 6 - Ions: Predicting Formation, Charge, and Formulas of Ions.

Lesson 7 - Ionic Compounds: Formation, Lattice Energy and Properties. Lesson 8 - Naming Ionic Compounds: Lesson 9 - Covalent Compounds: Lesson 10 - Lewis Structures: Lesson 11 - Lewis Dot Structures: Lesson 12 - Lewis Dot Structures: Lesson 13 - Covalent Bonds: Predicting Bond Polarity and Ionic Character.

Lesson 19 - Molecular Orbital Theory: Lesson 20 - Metallic Bonding: Lesson 22 - Organic Molecules: Alkanes, Alkenes, Aromatic Hydrocarbons and Isomers. Lesson 23 - Functional Groups in Organic Molecules. Lesson 24 - Characteristics of the Hypoiodite Ion.

Lesson 25 - Dipole Moment: Lesson 1 - The Rate of Dissolution: Lesson 2 - Solutions, Electrolytes and Nonelectrolytes.

Lesson 3 - Solubility and Solubility Curves. Lesson 4 - Solubility of Common Salts: Lesson 5 - Calculating Molarity and Molality Concentration. Lesson 6 - Calculating Dilution of Solutions. Lesson 7 - Colligative Properties and Raoult's Law. Lesson 3 - Mass-to-Mass Stoichiometric Calculations. Lesson 4 - Stoichiometry: Calculating Relative Quantities in a Gas or Solution. Lesson 8 - Hydrates: Lesson 1 - Decomposition and Synthesis Reactions.

Lesson 4 - Neutralization and Acid-Base Reactions. Lesson 5 - Dissociation Constant and Autoionization of Water. Lesson 6 - The pH Scale: Calculating the pH of a Solution. Lesson 8 - Coordination Chemistry: Bonding in Coordinated Compounds.

Lesson 9 - Precipitation Reactions: Predicting Precipitates and Net Ionic Equations. Lesson 12 - The Activity Series: Predicting Products of Single Displacement Reactions. Lesson 13 - Electrochemical Cells and Electrochemistry. Lesson 15 - Writing and Balancing Combustion Reactions. Lesson 1 - The Photoelectric Effect: Lesson 3 - Planck's Constant: Lesson 5 - Heisenberg Uncertainty Principle: Lesson 6 - Electron Cloud: Lesson 7 - Nuclear Physics: Lesson 8 - Nuclear Reaction: Lesson 11 - Half-life: Applications of Nuclear Chemistry.

Lesson 14 - Disintegration Energy in Nuclear Physics: Lesson 1 - What Is Motion? Lesson 2 - Speed and Velocity: Lesson 3 - What is Acceleration? Lesson 4 - Implications of Mechanics on Objects. Lesson 5 - Uniform Circular Motion: Lesson 6 - Projectile Motion Practice Problems.

Lesson 7 - Projectile Motion: Lesson 1 - Newton's First Law of Motion: Examples of the Effect of Force on Motion. Lesson 2 - Distinguishing Between Inertia and Mass. Lesson 3 - Mass and Weight: Lesson 4 - State of Motion and Velocity. Lesson 5 - Force: Lesson 6 - Forces: Lesson 7 - Free-Body Diagrams. Lesson 8 - Net Force: Lesson 9 - Newton's Second Law of Motion: The Relationship Between Force and Acceleration.

Lesson 10 - Determining the Acceleration of an Object. Lesson 12 - Air Resistance and Free Fall. Lesson 13 - Newton's Third Law of Motion: Examples of the Relationship Between Two Forces.

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Nov 27,  · 1. All chemical reactions fit into one of the five major categories of chemical reactions. true or false 2. When a chemical reaction occurs, the atoms involved in the change: 3. A balanced chemical equation should have _____ of the lowest possible whole numbers. 4. In the chemical equation, C3H4 + O2 --> C5H2O6, what are the Status: Resolved. Need even more information? Don't forget to search the reference sources of Infoplease for answers to your homework questions.

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