04:15Types of Matter: Elements, Compounds, and MixturesProfessor Dave Explains3037views25rank1comments
06:59Classification of matter | Element, compound, homogeneous mixture, heterogeneous mixture - Dr KChemSimplified657views
07:50Pure Substances, Elements, Compounds, Homogenous & Heterogenous Mixture Examples and ProblemsConquer Chemistry1251views
04:353 States of Matter for Kids (Solid, Liquid, Gas): Science for Children - FreeSchoolFree School1224views2rank
Multiple ChoiceWhich of the following statements is true?6871views63rank10commentsHas a video solution.
Multiple ChoiceChoose the homogeneous mixture from the list below.4962views42rank6commentsHas a video solution.
Open QuestionClassify each of the following as an element, compound or mixture.a) Ammonia, NH3b) Gold barc) Orange juiced) Winee) Saline solution3309views35rank5commentsHas a video solution.
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?584views
Multiple ChoiceChoose the homogeneous mixture from the list below.4849views54rank3commentsHas a video solution.
Open QuestionA _____ is a physical combination of matter in any proportions.222views2rankHas a video solution.
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 size1492views4rankHas a video solution.
Textbook QuestionWhich of the following figures represents (d) a mixture of an element and a compound? (More than one picture might fit each description.)752views1rankHas a video solution.
Textbook QuestionWhich of the following figures represents (a) a pure element, (More than one picture might fit each description.)662views1rankHas a video solution.
Textbook QuestionWhich of the following figures represents (c) a pure compound, (More than one picture might fit each description.) 1664views3rankHas a video solution.
Textbook QuestionWhich of the following figures represents (b) a mixture of two elements, (More than one picture might fit each description.) 1319viewsHas a video solution.
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?596viewsHas a video solution.
Textbook QuestionIs the separation method used in brewing a cup of coffee best described as distillation, filtration, or chromatography? 464viewsHas a video solution.
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 compound456viewsHas a video solution.
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.229views1rankHas a video solution.
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.698viewsHas a video solution.
Textbook QuestionClassify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (c) aluminium686viewsHas a video solution.
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.1830viewsHas a video solution.
Textbook QuestionClassify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (c) diamond926viewsHas a video solution.
Textbook QuestionClassify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (b) beer871viewsHas a video solution.
Textbook QuestionClassify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (a) milk1124viewsHas a video solution.
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?1343viewsHas a video solution.
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?441viewsHas a video solution.
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.370viewsHas a video solution.
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.403viewsHas a video solution.
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.411viewsHas a video solution.
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.369views1rankHas a video solution.
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.380viewsHas a video solution.
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.371viewsHas a video solution.
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 released603viewsHas a video solution.
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.702viewsHas a video solution.
Textbook QuestionRefer to Figure 1.2. What is developed when numerous observations support a hypothes384viewsHas a video solution.
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 observations713viewsHas a video solution.
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 soup2027viewsHas a video solution.
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 monoxide2148viewsHas a video solution.
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. 2678views1commentsHas a video solution.
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 element635viewsHas a video solution.
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. 3234viewsHas a video solution.
Textbook QuestionClassify each of the following as a pure substance, a solution, or a heterogeneous mixture: (b) a 999 gold bar1040views1rankHas a video solution.
Textbook QuestionClassify each of the following as a pure substance, a solution, or a heterogeneous mixture: (c) stainless steel.780viewsHas a video solution.
Textbook Question(b) A(n) _________ reliably predicts the behavior of matter, while a(n) _________ provides an explanation for that behavior.463viewsHas a video solution.
Textbook Question(a) Which is more likely to eventually be shown to be incorrect: an hypothesis or a theory?355viewsHas a video solution.
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.784viewsHas a video solution.
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.549viewsHas a video solution.
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.835viewsHas a video solution.
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.505viewsHas a video solution.
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.504viewsHas a video solution.
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.437viewsHas a video solution.
Open QuestionBased on the given information, what is the best classification for this sample of crude oil?173viewsHas a video solution.
Open QuestionWhat is the basic form of matter that cannot be broken down any further?173viewsHas a video solution.
Open QuestionWhich solution is a homogeneous mixture: sand and water, salt and water, salad dressing, or soil?209viewsHas a video solution.
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.285viewsHas a video solution.
Open QuestionWhich term describes a pure substance that is made up of only one type of atom?159viewsHas a video solution.
Open QuestionWhat is the correct classification of a mixture in which both a solid and a liquid are visible?161viewsHas a video solution.
Open QuestionWhich of the following is the correct representation of a mixture of an element and a compound?686viewsHas a video solution.
Open QuestionUnlike an element, a(n) ________ may be separated through a physical process like filtration.160viewsHas a video solution.
Open QuestionOne particular type of atom and it cannot be broken down into a simpler substance149viewsHas a video solution.
Open QuestionA substance made up of two or more elements that have been chemically combined is called149viewsHas a video solution.
Open QuestionA substance made of atoms of two or more different elements joined by chemical bonds.136viewsHas a video solution.
Open QuestionA substance that cannot be broken down into other substances by ordinary chemical procedures is a(n)125viewsHas a video solution.
Open QuestionWhen 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called a(n)?138viewsHas a video solution.
Open QuestionA pure chemical substance that consists of one type of atom is called a(n)130viewsHas a video solution.
Open QuestionA(n) ____________________________________________ is a pure substance made of only one type of atom.145viewsHas a video solution.
Open QuestionWhich of the following could be classified as matter? check all of the boxes that apply.154viewsHas a video solution.
Open QuestionA homogenous mixture of two or more substances is known as a(n)161viewsHas a video solution.