Problem 2.1TC: Consider the photograph and illustrations of table salt. Do they include a model? Do they include a... Problem 2.2TC: In the left box, draw a particulate-level illustration of a substance in the gaseous state. Model... Problem 2.3TC: Classify the following changes as chemical C or physical P a Baking bread b Grinding sugar into... Problem 2.4TC: Specific gravity is a physical property. Beakers hold three clear, colorless liquids A, B, and C.... Problem 2.5TC: Classify the following as homogenous or heterogeneous: aThe contents of the beaker on the left in... Problem 2.6TC: Table salt from the beaker on the left in the photograph is added to water, forming the solution on... Problem 2.7TC: Which of the following are compounds, and which are elements? aNa2S bBr2 cPotassium hydroxide... Problem 2.8TC Problem 2.9TC: Identify the net electrical force-attraction, repulsion, or none- between the following pairs: aTwo... Problem 2.10TC: aIs the process of boiling water exothermic or endothermic with respect to the water? bA charged... Problem 2.11TC: In everyday language, the term conserve usually refers to protecting something.It is important to... Problem 1CLE: Write a brief description of the relationships among each of the following groups of terms or... Problem 2CLE: Write a brief description of the relationships among each of the following groups of terms or... Problem 3CLE Problem 4CLE: Write a brief description of the relationships among each of the following groups of terms or... Problem 5CLE Problem 6CLE Problem 1E Problem 2E: Classify each of the following as macroscopic, microscopic, or particulate: a a cell membrane; b a... Problem 3E: Suggest a reason for studying matter at the particulate level, given that it is too small to see. Problem 4E: How does a chemist think about particles that are so small that they are impossible to see with the... Problem 5E: Using spheres to represent individual atoms, sketch particulate illustrations of a substance as it... Problem 6E: Describe a piece of ice at the particulate level. Then describe what happens to the ice as it is... Problem 7E: 7.The word pour is commonly used in reference to liquids but not to solids or gases. Can you pour a... Problem 8E Problem 9E: Which of the three states of matter is most easily compressed? Suggest a reason for this. Problem 10E: Compare the volumes occupied by the same sample of matter when in the solid, liquid, and gaseous... Problem 11E: Classify each of the following properties as chemical or physical: a hardness of diamond; b... Problem 12E: Classify the italicized property as chemical or physical: a a shiny piece of iron metal gets rusty... Problem 13E: Which among the following are physical changes? a blowing glass; b fermenting grapes; c forming a... Problem 14E: Classify each of the following changes as chemical or physical: a grilling a steak; b souring of... Problem 15E: Is the change illustrated below a physical change or a chemical change? Explain your answer. Problem 16E: Is the change in the illustration below a physical change or a chemical change? Explain your answer. Problem 17E: Diamonds and graphite are two forms of carbon. Carbon is an element. Chunks of graphite are... Problem 18E: Aspirin is a pure substance. If you had the choice of buying a widely advertised brand of aspirin... Problem 19E: The substance in the glass below is from a kitchen tap. Is it a pure substance or a mixture? What if... Problem 20E: Are the contents of the bottle in the picture below a pure substance or a mixture? Problem 21E: Which of the following particulate illustrations represent pure substances and which represent... Problem 22E: Which of the following particulate illustrations represent pure substances and which represent... Problem 23E: Which of the following are pure substances and which are mixtures: a table salt; b tap water; c... Problem 24E: Which of the substances below are pure and which are mixtures? Which could be either? Explain your... Problem 25E: Apart from food, list five things in your home that are homogeneous. Problem 26E: Can the terms homogeneous and heterogeneous be applied to pure substances as well as to mixtures?... Problem 27E: Which items in the following list are heterogeneous? a sterling silver; b freshly opened root beer;... Problem 28E: Classify each of the following mixtures as either homogeneous or heterogeneous: a apple juice; b... Problem 29E: Some ice cubes are homogeneous and some are heterogeneous. Into which group do ice cubes from your... Problem 30E: The freshly polished brass cylinder in the picture below is a mixture of copper and zinc. Is the... Problem 31E: Draw a particulate-level sketch of a heterogeneous pure substance. Problem 32E: Draw a particulate-level sketch of a homogeneous mixture. Problem 33E: Suppose someone emptied ball bearings into a container of salt. Could you separate the ball bearings... Problem 34E: Suggest at least two ways to separate ball bearings from table tennis balls. On what property is... Problem 35E Problem 36E: You receive a mixture of table salt and sand and have to separate the mixture into pure substances.... Problem 37E: Classify the following as compounds or elements: a silver bromide used in photography; b calcium... Problem 38E: Classify each of the following pure substances as either an element or a compound: a silicon... Problem 39E: Which of the following are elements, and which are compounds? a NaOH; b BaCl2; c He; d Ag; e Fe2O3. Problem 40E: Classify each of the following pure substances as either an element or a compound: a C; b C2H5OH; c... Problem 41E: Classify each substance in the illustrations below as an element or a compound. ab cd e Problem 42E: Does each of the particulate-level models below depict an element or a compound? a b c d e Problem 43E: a Which of the following substances would you expect to be elements and which would you expect to be... Problem 44E: a Which of the following substances would you expect to be elements and which would you expect to be... Problem 45E: Metal A dissolves in nitric acid solution. You can recover the original metal if you place Metal B... Problem 46E: A white, crystalline material that looks like table salt gives off a gas when heated under certain... Problem 47E: Questions 47 and 48: Samples of matter may be classified in several ways, including gas, liquid, or... Problem 48E: Questions 47 and 48: Samples of matter may be classified in several ways, including gas, liquid, or... Problem 49E: What is the main difference between electrostatic forces and gravitational forces? Which is more... Problem 50E: Identify the net electrostatic force attraction, repulsion or none between the following pairs of... Problem 51E: Identify the reactants and products in the equation AgNO3+NaClAgCl+NaNO3 Problem 52E: In the following equation for a chemical reaction, the notation s, l, or g indicates whether the... Problem 53E: In the equation Ni+Cu(NO3)2Ni(NO3)2+Cu, which of the reactants is/are elements, and which of the... Problem 54E: Write the formulas of the elements that are products and the formulas of the compounds that are... Problem 55E Problem 56E: Classify each of the following changes as endothermic or exothermic with respect to the italicized... Problem 57E: As a child plays on a swing, at what point in her movement is her kinetic energy the greatest? At... Problem 58E: A bicycle accelerates from 5 miles per hour to 15 miles per hour. Does its energy increase or... Problem 59E: After solid limestone is heated, the rock that remains weighs less than the original limestone. What... Problem 60E: Before electronic flashes were commonly used in photography, a darkened area was lit by a device... Problem 61E: The photograph below shows a beaker of water and a sugar cube, the combined mass of which is... Problem 62E Problem 63E Problem 64E Problem 65E: Distinguish precisely and in scientific terms the differences among items in the following groups. a... Problem 66E Problem 67E: A natural-food store advertises that no chemicals are present in any food sold in the store. If the... Problem 68E Problem 69E: Name some pure substances you have used today. Problem 70E: How many homogeneous substances can you reach without moving from where you are sitting right now? Problem 71E: Which of the following can be pure substances: mercury, milk, water, a tree, ink, iced tea, ice,... Problem 72E: Can you have a mixture of two elements as well as a compound of the same two elements? Problem 73E: Can you have more than one compound made of the same two elements? If yes, try to give an example. Problem 74E: Rainwater comes from the oceans. Is rainwater more pure, less pure, or of the same purity as ocean... Problem 75E Problem 76E Problem 77E: Consider the sample of matter in the illustration below. Answer each question independently and... Problem 78E: A particulate-level illustration of the reaction AB+CDAD+CB is shown below. a Identify the reactants... Problem 79E Problem 80E Problem 81E Problem 82E Problem 83E: Particles in the illustration below undergo a chemical change. Which among the remaining boxes, a... Problem 84E format_list_bulleted