Grading Your final exam score will be posted after I have graded the essay question. The exam score will be curved based on the performance of the class. ty Question 1 2 pts Which of the following statements is FALSE? O Compounds are 2 or more different elements chemically bonded O Elements cannot be broken down into simpler pure substances O A mixture is 2 or more different pure substances chemically bonded O Both elements and compounds are classified as pure substances Next EGE Quiz saved at 9:02pm Submit Quiz

Grading Your final exam score will be posted after I have graded the essay question. The exam score will be curved based on the performance of the class. ty Question 1 2 pts Which of the following statements is FALSE? O Compounds are 2 or more different elements chemically bonded O Elements cannot be broken down into simpler pure substances O A mixture is 2 or more different pure substances chemically bonded O Both elements and compounds are classified as pure substances Next EGE Quiz saved at 9:02pm Submit Quiz

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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E Copy of Fall 2020 Fina X hHp8TPKsYapxmOBQpq19sYHEQfKQudwLFoPO2ojmMGw/edit d-ons Help Last edit was seconds ago BIUA c 田回。三=== 三ニ三▼E 三E X Arial 14.5 2 3 4 6 A student needs to identify an unknown substance found in the lab based on its physical properties. The substance has a mass of 130.5 g and a volume of 36.73 ml and tarnishes when it comes in contact with water. (AKS 2b, DOK2). Density e/cm3) 0.42 0.95 0.36 3.71 0.30 1.12 0.20 0.69 Name Cherry Alloy Cuppric Alloy Elastica Aloy Galvanized Alloy Holy Alloy Marblic Alloy Porous Alloy Silica Dioxica Alloy Stuper Alloy Trisphereica Alloy Vulcan Alloy Zink Alloy 0.62 246 1.88 3.55 Question options: A.The unknown substance is Cherry Alloy. The student was able to use the reactivity to solve the problem-because tarnishing is a physical property of the Cherry Alloy. B. The unknown substance is Vulcan Alloy. The student was able to use density to solve the problem because density is a physical property of Vulcan Alloy. C.The unknown…
Write a complete chemical formula, including physical state symbol, for each element listed below in its standard state. The first row of the table has been completed for you. element iron carbon hydrogen krypton I Don't Know formula Fe(s) 0 Submit X 00 $ S n Stv © 2023 McGraw Hill LLC. All Rights R 9 A Ⓒ J
An analytical chemist measures the amount of Elements E₁ and E₂ in four samples of an unknown Substance. sample of E1 1 2 3 mass mass of E2 4 16.0 g 9.1 g 17.1 g 9.8 g 18.5 g 10.6 g 12.0 g 6.9 g It's known that X contains no elements other than E₁ and E₂. Using this information, answer the questions in the table below. Is X a pure substance or a mixture? If you don't have enough information to decide, choose can't decide. If you said X is a pure substance, calculate the mass of Element E₁ the analytical chemist would find in a new 10.0 g sample of X. Round your answer to 2 significant digits. O pure substance O mixture O (can't decide) g
N Netflix How do the properties of compounds compare to the properties of the elements from which they are derived? The properties are generally different. The properties are the same. The properties are different only for metals. The properties differ insignificantly.
A pure substance has been isolated in the laboratory. Based on the two characteristics below, how can the substance be classified? 1. The species can not be separated by physical means. II. The species can be separated by chemical means. a compound O a heterogeneous mixture O a homogeneous mixture an element
Explain your rationale for using the summative assessment (below) from the lesson plan on mixing substances in a 5th-grade classroom based on the below standard and learning objective, including how you will use student outcomes to inform future instructional decisions. Summative Assessment Summative: Components of the Lab Report Purpose: The student should clearly state the purpose of the experiment, which is to determine whether the mixing of two or more substances results in new substances. Procedure: The student should describe the steps they took to conduct the experiment. This includes the substances they chose to mix and the safety equipment they used. Observations: The student should record any observable changes that occurred when the substances were mixed. This could include a color change, the formation of a precipitate, or a change in temperature. Conclusion: The student should state whether a new substance was formed based on their observations. They should also…
Percentage Abundance. The element rubidium consists of two isotopes, one having an isotopic mass of 84.912 and the other having an isotopic mass of 86.920. Determine the percentage abundance of the lighter isotope. Record the answer to the correct number of significant figures. Show the numerical set-ups. Include units and the correct number of significant figures in the set-up.
An iron atom has a mass of 9.27 × 10 - 23 g and a cooking pot has a mass of 0.500 kg. Use this information to answer the questions below. Be sure your answers have the correct number of significant digits x10 What is the mass of 1 mole of iron atoms? 5.58 x 10 g How many moles of iron atoms have a mass equal to the mass of a cooking pot? .900
tributi X Normal Distributi X ample Work rmat Tools Extensions Help locument/d/1KWoB0hrXolu7UEKbq4f8LBMHfpjHBRVU3qUzVI7K80U/edit Saved to Drive Normal text I 2022-2023 Mr. R X - I ▼ | Calibri 1 16 11. Which quantity is used to define 1 atomic mass unit? 3 100 Copy of Chern B x I UA 4 5 hp 4/27 - Unit 5.mp4 X particles. 12. How many molecules are there in 2 g of water (H₂O)? HINT: Molar mass of water is 18 g/mol Pathway: mass → moles → molecules E Did You Know? The word mole represents a specific number of objects, 6.022 × 10²¹ , just as the word dozen represents a specific number of objects, 12. The molar mass is the mass of a substance that contains 6.022 × 10²¹ DC Normal DE VE E 127 64°F Mos
Mixtures can be classified as either homogeneous or heterogeneous. Compounds cannot be classified in this way. Why not? In your answer,explain what is meant by heterogeneous and homogeneous.
Part A- Determining Density and Using Density to Determine Volume or Mass Platinum, Pt, is one of the rarest metals. Worldwide annual production is only about 130 tons. Platinum has a density of 21.4 g/cm³. If thieves were to steal platinum from a bank using a small truck with a maximum payload of 900 lb, how many 1 L bars of the metal could they take? O 1 bars O 2 bars O 19 bars O 42 bars O 47 bars Submit Request Answer Provide Feedback
The following prompt will be used to answer the first six questions. An experiment was performed to separate the components of a binary mixture composed of sucrose (sugar) and sand. The following data was collected in lab during the experiment. Mass of original binary mixture: 20.100 ± 0.001 g Mass of initial filter paper: 21.206 ± 0.001 g Mass of filter paper and isolated sand: 25.226 ± 0.001 g 9b Given the data and information in the prompt, what is the calculated absolute error on the percent of sugar in the mixture? Enter the absolute error you calculated in the box below. You do not need to include the % symbol with your answer.