Questions and Answers
The properties of compounds depend on?
What is a chemical formula?
Symbols and subscripts that tell the type and ratio of atoms in a compound
What is the ratio of calcium (Ca) to carbon (C) to nitrogen (N) in calcium cyanide (CaCN2)?
1:1:2
What elements make up glucose?
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The same elements can form?
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A covalent bond is formed when a negative ion is attracted to a positive ion.
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Chlorine (Cl2) is a compound.
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A covalent bond is one in which atoms share a pair of electrons.
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A polar covalent bond involves equal sharing of electrons.
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If the oxygen in a water molecule attracts electrons more strongly than the hydrogen atoms do, the molecule must be held together by polar covalent bonds.
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Ionic compounds exist as individual molecules.
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The arrangement of atoms in a chemical bond affects the chemical structure of a substance.
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A regular crystal structure is common to ionic compounds.
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Why are metals good conductors of electricity?
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A metallic bond is a chemical bond between?
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Metals can easily be drawn into wire because?
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Most ionic compounds?
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What are some properties of covalent compounds?
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What is the bond that allows metal atoms to share their electrons with one another?
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What is a pair of shared electrons between two atoms?
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What uses chemical symbols to represent the atoms of the elements and their ratios in a chemical compound?
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What is a group of atoms held together by covalent bonds so that they move as a group?
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What is a covalent bond in which the electrons are shared unequally?
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What is the force of attraction between positive and negative ions?
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What is a number written to the right of the chemical symbol and slightly below it?
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What determines the properties of a compound?
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A compound dissolves easily in water and the solution conducts electricity. What type of compound is it?
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The chemical formula for propane is C3H8. The subscripts tell you that propane has?
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How can carbon have different forms?
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What makes metals easy to form into different shapes?
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What parts of atoms combine to form different compounds with different properties?
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In an oxygen (O2) molecule?
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What happens to electrons when atoms bond?
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What are ionic bonds?
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What happens between atoms in covalent and polar covalent compounds?
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The properties of chemical compounds?
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The chemical formula for the simple sugar called glucose is C6H12O6. What does the formula tell you?
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Polar covalent bonds are formed when?
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A molecule is a particle formed as a result of?
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A magnesium ion has a net charge of +2. A fluorine ion has a net charge of -1. What kind of compound will these two ions form and what is the compound's name?
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Carbon can combine with oxygen to form carbon monoxide, carbon dioxide, and carbon suboxide. What can you say for certain about these three compounds?
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The type of chemical bond that forms between the atoms of two different elements is determined by the?
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Different compounds can be composed of?
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Compounds often have different properties from those of the?
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Most ionic compounds?
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What explains why carbon can exist in three different forms?
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Study Notes
Chemical Properties and Composition
- Properties of compounds depend on the elements they consist of and their arrangement.
- A chemical formula depicts the type and ratio of atoms in a compound using symbols and subscripts.
- Different compounds can form from the same elements, resulting in varying properties.
Chemical Bonding
- Covalent bonds are formed through the sharing of electrons.
- Ionic bonds arise from the attraction between positive and negative ions.
- Polar covalent bonds involve unequal sharing of electrons.
- The arrangement of atoms in chemical bonds significantly influences the chemical structure.
Compound Types and Examples
- Glucose (C6H12O6) is made of carbon, hydrogen, and oxygen atoms in a ratio of 6:12:6.
- Calcium cyanide (CaCN2) has a calcium to carbon to nitrogen ratio of 1:1:2.
- Common properties of ionic compounds include the ability to conduct electricity when dissolved in water.
- Properties of covalent compounds include low melting temperatures and poor electrical conductivity.
Atomic Interactions
- Atoms form different compounds with unique properties through their electron clouds.
- Electrons can be shared or transferred during bonding, affecting compound formation.
- A magnesium ion (+2) and a fluorine ion (-1) combine to form magnesium fluoride (MgF2).
Key Concepts in Bonding
- Regular crystal structures are typical in ionic compounds.
- Metals exhibit good electrical conductivity due to easy flow of electrons.
Additional Chemical Structure Insights
- Molecules are formed when atoms share electrons and can be composed of various element ratios.
- Different structures result from different types of bonding interactions.
- Carbon can form unique compounds like carbon monoxide (CO), carbon dioxide (CO2), and carbon suboxide (C3O2), each exhibiting distinct properties.
Conclusion on Properties of Compounds
- The characteristics of chemical compounds can significantly differ from the elements that make them.
- Understanding the interactions and bonds between atoms is crucial in predicting compound behavior and properties.
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Test your knowledge with these flashcards from Science Chapter 2. Focused on key concepts like compound properties and chemical formulas, these cards provide a quick reference for essential definitions and examples. Perfect for students looking to reinforce their understanding of chemistry fundamentals.