04:15Types of Matter: Elements, Compounds, and MixturesProfessor Dave Explains3091views25rank1comments
10:02Classifying Matter With Practice Problems | Study Chemistry With UsMelissa Maribel1128views1rank
06:59Classification of matter | Element, compound, homogeneous mixture, heterogeneous mixture - Dr KChemSimplified695views1rank
07:50Pure Substances, Elements, Compounds, Homogenous & Heterogenous Mixture Examples and ProblemsConquer Chemistry1362views
04:353 States of Matter for Kids (Solid, Liquid, Gas): Science for Children - FreeSchoolFree School1302views2rank
Open QuestionClassify each of the following as an element, compound or mixture.a) Ammonia, NH3b) Gold barc) Orange juiced) Winee) Saline solution3427views39rank5comments
Multiple ChoiceConsider the following data obtained by decomposing samples of carbon dioxide, CO2, into its component elements. Mass of CO2 and Components Sample Mass CO2 Mass C Mass O2 1 44.00 g 12.00 g 32.00 g 2 22.00 g 6.00 g 16.00 g 3 88.00 g 24.00 g 64.00 g Which of the following statements is consistent with this data?618views1rank
Textbook QuestionWhich of the following statements is a hypothesis about the synthesis of gold nanoparticles? (LO 1.1) (a) Adding a salt solution to gold nanoparticles causes the color to change from red to blue. (b) To examine the effect of salt on gold nanoparticles, variable concentrations of salt are added to the nanopar-ticles and the results are measured (c) A solution of gold nanoparticles with an average diam-eter of 30 nm has a wavelength of maximum absorption of 450 nm and is a reddish-orange color. (d) Adding a substance with a negative charge to the surface of the nanoparticles creates repulsive forces that stabilize small particle size1719views3rank
Textbook QuestionWhich of the following figures represents (d) a mixture of an element and a compound? (More than one picture might fit each description.)782views1rank
Textbook QuestionWhich of the following figures represents (a) a pure element, (More than one picture might fit each description.)686views1rank
Textbook QuestionWhich of the following figures represents (c) a pure compound, (More than one picture might fit each description.) 1829views3rank
Textbook QuestionWhich of the following figures represents (b) a mixture of two elements, (More than one picture might fit each description.) 1363views
Textbook QuestionMusical instruments like trumpets and trombones are made from an alloy called brass. Brass is composed of copper and zinc atoms and appears homogeneous under an optical microscope. The approximate composition of most brass objects is a 2:1 ratio of copper to zinc atoms, but the exact ratio varies somewhat from one piece of brass to another. (a) Would you classify brass as an element, a compound, a homogeneous mixture, or a heterogeneous mixture?634views
Textbook QuestionIs the separation method used in brewing a cup of coffee best described as distillation, filtration, or chromatography? 496views
Textbook QuestionThe molecular illustration represents (LO 2.18) (a) a pure element (b) a mixture of two elements (c) a pure compound (d) a mixture of an element and a compound483views
Textbook QuestionThe photo below shows a picture of an agate stone. Jack, who picked up the stone on the Lake Superior shoreline and polished it, insists that agate is a chemical compound. Ellen argues that it cannot be a compound. Discuss the relative merits of their positions.274views1rank
Textbook QuestionClassify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (d) iodine tincture.730views
Textbook QuestionClassify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (c) aluminium724views
Textbook QuestionClassify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (d) mayonnaise.1870views
Textbook QuestionClassify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (c) diamond961views
Textbook QuestionClassify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (b) beer887views
Textbook QuestionClassify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (a) milk1154views
Textbook QuestionA solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen. Based on these observations, can we determine whether solids A and B and gas C are elements or compounds?1420views
Textbook QuestionMillikan determined the charge on the electron by studying the static charges on oil drops falling in an electric field (Figure 2.5). A student carried out this experiment using several oil drops for her measurements and calculated the charges on the drops. She obtained the following data: Droplet Calculated Charge (C) A 1.60 * 10-19 B 3.15 * 10-19 C 4.81 * 10-19 D 6.31 * 10-19 (c) What value should she report for the electronic charge?472views
Textbook QuestionThe following statements pertain to the development of the theory of combustion by the French chemist Lavoisier in the eighteenth century. Match the statement with the appro-priate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method (c) Combustion of a metal in a closed container ceases after a length of time.394views
Textbook QuestionThe following statements pertain to the development of the theory of combustion by the French chemist Lavoisier in the eighteenth century. Match the statement with the appro-priate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method (b) Oxygen gas combines with a substance during its combustion.423views
Textbook QuestionThe following statements pertain to the development of the theory of combustion by the French chemist Lavoisier in the eighteenth century. Match the statement with the appro-priate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method (a) A metal is burned in a closed container, and the change in mass of the solid and volume of the gas is measured.441views
Textbook QuestionThe following statements pertain to the development of the theory of the structure of DNA. Match the statement with the appropriate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method. (b) In a sample of DNA, there are equal amounts of the bases A and T and equal amounts of the bases C and G.396views1rank
Textbook QuestionThe following statements pertain to the development of the theory of the structure of DNA. Match the statement with the appropriate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method. (a) Two strands of DNA wind around one another in a helical structure.405views
Textbook QuestionThe following statements pertain to the development of the theory of the structure of DNA. Match the statement with the appropriate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method. (c) Direct X rays at a sample of crystallized DNA, and inter-pret the diffraction pattern for structural information.396views
Textbook QuestionClassify each statement as an observation, a law, or a theory. a. All matter is made of tiny, indestructible particles called atoms. b. When iron rusts in a closed container, the mass of the container and its contents does not change. c. In chemical reactions, matter is neither created nor destroyed. d. When a match burns, heat is released650views
Textbook QuestionClassify each statement as an observation, a law, or a theory. a. Chlorine is a highly reactive gas. b. If elements are listed in order of increasing mass of their atoms, their chemical reactivities follow a repeating pattern. c. Neon is an inert (or nonreactive) gas. d. The reactivity of elements depends on the arrangement of their electrons.782views
Textbook QuestionRefer to Figure 1.2. What is developed when numerous observations support a hypothes412views
Textbook QuestionWhat is the difference between a hypothesis and theory? (a) A hypothesis provides an explanation for a phenomenon, but a theory does not. (b) A theory provides an explanation for a phenomenon, but a hypothesis does not. (c) Both a theory and a hypothesis provide an explanation for a phenomenon, but a theory has been upheld by experi-mental observations750views
Textbook QuestionClassify each substance as a pure substance or a mixture. If it is a pure substance, classify it as an element or a compound. If it is a mixture, classify it as homogeneous or heterogeneous. a. sweat b. carbon dioxide c. aluminum d. vegetable soup2309views
Textbook QuestionClassify each substance as a pure substance or a mixture. If it is a pure substance, classify it as an element or a compound. If it is a mixture, classify it as homogeneous or heterogeneous. a. wine b. beef stew c. iron d. carbon monoxide2230views
Textbook QuestionDetermine whether each molecular diagram represents a pure substance or a mixture. If it represents a pure substance, classify the substance as an element or a compound. If it represents a mixture, classify the mixture as homogeneous or heterogeneous. 2775views1comments
Textbook QuestionIn the following drawings, red and blue spheres represent atoms of different elements. Match the molecular pictures (a)–(c) with the following descriptions: (i) a pure substance consisting of a compound (ii) a pure substance consisting of an element (iii) a mixture of element676views
Textbook QuestionDetermine whether each molecular diagram represents a pure substance or a mixture. If it represents a pure substance, classify the substance as an element or a compound. If it represents a mixture, classify the mixture as homogeneous or heterogeneous. 3294views
Textbook QuestionClassify each of the following as a pure substance, a solution, or a heterogeneous mixture: (b) a 999 gold bar1069views1rank
Textbook QuestionClassify each of the following as a pure substance, a solution, or a heterogeneous mixture: (c) stainless steel.808views
Textbook Question(b) A(n) _________ reliably predicts the behavior of matter, while a(n) _________ provides an explanation for that behavior.499views
Textbook Question(a) Which is more likely to eventually be shown to be incorrect: an hypothesis or a theory?382views
Textbook QuestionWhich of the following would you characterize as pure or nearly pure substance? (a) stomach acid; (b) dry ice; (c) ice-cream; (d) stainless steel; (e) petroleum; (f) distilled water; (g) carbon monoxide gas; (h) compressed air in balloon.801views
Textbook QuestionJudge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (i) Compounds always contain at least two different elements.574views
Textbook QuestionJudge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (b) All mixtures contain at least one element and one compound.861views
Textbook QuestionJudge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (a) Air and water are both elements.528views
Textbook QuestionJudge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (c) Compounds can be decomposed into two or more other substances; elements cannot.532views
Textbook QuestionJudge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (f) A hypothesis is more weakly supported by experimental evidence than a theory.466views
Open QuestionBased on the given information, what is the best classification for this sample of crude oil?203views
Open QuestionWhich solution is a homogeneous mixture: sand and water, salt and water, salad dressing, or soil?240views
Open QuestionIn the following images, the white spheres represent hydrogen atoms and the red spheres represent oxygen atoms. classify each sample as an element, a compound, or a mixture.340views
Open QuestionWhat is the correct classification of a mixture in which both a solid and a liquid are visible?179views
Open QuestionWhich of the following is the correct representation of a mixture of an element and a compound?729views
Open QuestionUnlike an element, a(n) ________ may be separated through a physical process like filtration.180views
Open QuestionOne particular type of atom and it cannot be broken down into a simpler substance172views
Open QuestionA substance made up of two or more elements that have been chemically combined is called171views
Open QuestionA substance made of atoms of two or more different elements joined by chemical bonds.161views
Open QuestionA substance that cannot be broken down into other substances by ordinary chemical procedures is a(n)141views
Open QuestionWhen 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called a(n)?164views
Open QuestionA(n) ____________________________________________ is a pure substance made of only one type of atom.168views
Open QuestionWhich of the following could be classified as matter? check all of the boxes that apply.179views