2.3 Elements And Compounds Worksheet Answer Key

2.3 Elements And Compounds Worksheet Answer Key – 2.3 Elements and Compounds > 1 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Section 2. Semantics and Modifications 2.1 Properties.

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2.3 Elements And Compounds Worksheet Answer Key

2.3 Elements And Compounds Worksheet Answer Key

1 2.3 Elements and Connections > 1 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Chapter 2 Substances and Changes 2.1 Properties of Matter 2.2 Mixtures 2.3 Elements and Compounds 2.4 Chemical Reactions

Elements, Compounds, And Mixtures Worksheet

2 2.3 Elements and Connections > 2 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Substances can be classified as elements or compounds. An element is the simplest form of matter with its own set of properties. – Oxygen and hydrogen are two of over 100 known elements (all listed in the periodic table) Compounds are chemically combined in specific ratios (H 2 O, HCl) A substance that contains two or more elements. There is an important difference. Between elements and compounds: compounds can be broken down into simpler substances by chemical means, but elements cannot.

3 2.3 Elements and Connections > 3 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Decomposition of Compounds A physical method for separating mixtures. Chemical methods are used to separate the compounds. A chemical change is a change that results in a substance with a different composition than the original substance. The H2O -> H2+O2 product is quite different from the output water.

4 2.3 Elements and Connections > 4 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Examples of Chemical Changes Heating – Sugar decomposes into solid vapors C and H2O. C is an element and cannot be broken down any further.

5 2.3 Elements and Connections > 5 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Chemistry and You What happens to the compounds that cause the bread to change its taste when toasted?

Elements, Compounds, Mixture (answer Key)

6 2.3 Elements and Connections > 6 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Chemistry and You What happens to the compounds that cause bread to change its taste when it is toasted? Compounds undergo chemical changes that change the bread’s taste. They break down into solid carbon.

7 2.3 Elements and Connections > 7 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Properties of Compounds In general, the properties of a compound are quite different from those of its constituents. Sugar is a white sweet solid (C 6 H 12 O 6 ), whereas C is a black tasteless solid and H and O are tasteless gases.

8 2.3 Elements and Connections > 8 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. The composition and properties change when the elements sodium and chlorine chemically combine to form sodium chloride. Properties of the compound Sodium is a soft gray metal. Distinguish between elements and connections

2.3 Elements And Compounds Worksheet Answer Key

9 2.3 Elements and Connections > 9 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. The composition and properties change when the elements sodium and chlorine chemically combine to form sodium chloride. Properties of the compound Chlorine is a pale yellow, poisonous gas. Distinguish between elements and connections

Element, Compounds And Mixtures Interactive Worksheet

10 2.3 Elements and Compounds > 10 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. The composition and properties change when the elements sodium and chlorine chemically combine to form sodium chloride. Compound Properties Sodium chloride (commonly known as table salt) is a white solid. Distinguish between elements and connections

11 2.3 Elements and Connections > 11 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Can elements be broken down by chemical change? Can they be linked?

12 2.3 Elements and Connections > 12 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Can elements be broken down by chemical change? Can they be linked? No chemical process can break down elements into simpler substances. Compounds can be broken down by chemical changes.

13 2.3 Elements and Connections > 13 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Substance vs. Mixture Distinction A material is a substance if its composition is determined. A material is a mixture if it has a different composition. (copy drawing)

Elements, Compounds And Mixtures Interactive Worksheet

14 2.3 Elements and Connections > 14 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Task 2.2 Substance Classification When certain turquoise solids are heated, they form a colorless gas and a black solid. All three materials are substances. Can these substances be classified as elements or compounds?

15 2.3 Elements and Connections > 15 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Compounds can be broken down into simpler substances by chemical change, but elements cannot be broken down. A chemical change occurs when heated. Analyze Identify relevant terms. 1 A compound is a chemical combination of two or more elements. Example Problem 2.2

16 2.3 Elements and Connections > 16 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Solved Apply the concept to this situation. 2 Write down known facts and related concepts. The turquoise solid is heated. Example Problem 2.2

2.3 Elements And Compounds Worksheet Answer Key

17 2.3 Elements and Connections > 17 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Solved Apply the concept to this situation. 2 Determine if a substance is an element or a compound. A colorless gas and a black solid appear. Before heating, we had one substance. After heating there were two substances. The blue-green solid must be a compound. Based on the information provided, it is not possible to tell whether the colorless gas and black solid are elements or compounds. Example Problem 2.2

Solution: Elements Compounds And Mixtures Answers

18 2.3 Elements and Compounds > 18 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. The silvery liquid doesn’t seem to change no matter what you do. Likely to be a substance or mixture?

19 2.3 Elements and Connections > 19 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. The silvery liquid doesn’t seem to change no matter what you do. Likely a substance or mixture? Likely a drug. Mixtures may separate upon chemical or physical treatment.

20 2.3 Elements and Compounds > 20 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Symbols and Formulas The symbols used for the elements today are based on the system developed by the Swedish chemist Jöns Jacob Berzelius (1779-1848). Chemical symbols are based on the Latin names of the elements. Each element is represented by one or two letters of the chemical symbol. – The first letter of chemical symbols is capitalized. – Lower case if you use other characters.

21 2.3 Elements and Connections > 21 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Symbols and formulas Symbols and Latin names for some elements

Elements And Compounds Lesson Plan

22 2.3 Elements and Connections > 22 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Chemical Symbols = A simple way to write the chemical formulas of compounds. The symbols for hydrogen, oxygen, and carbon are H, O, and C. The chemical formula for water is H2O. The chemical formula for sucrose or table sugar is C12H22O11. Compound. The index of 2 for H 2 O means that there are always two hydrogen moieties for every oxygen moiety in water. Compounds have a fixed composition, so the formula of a compound is always the same.

23 2.3 Elements and Connections > 23 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. A periodic table is an arrangement in which elements are grouped according to a set of repeating (periodic) properties. This tool makes it easy to compare the properties of one element (or group of elements) with the properties of another element (or group of elements). Periodic table – example

24 2.3 Elements and Connections > 24 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. Periodic Table – Preview Each element is marked with a symbol in a box.

2.3 Elements And Compounds Worksheet Answer Key

25 2.3 Elements and Connections > 25 Copyright © Pearson Education, Inc. or its affiliates. all rights reserved. The elements are listed in atomic order from left to right, top to bottom. The atomic number of the element is displayed in the center above the symbol. unique to each element

Elements, Compounds And Mixtures (gcse) — The Science Hive

26 2.3 Elements and Compounds > 26 Copyright © Pearson Education, Inc.

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