TCI lesson 2: molecules and extended structures

The way the 92 elements in nature make up all matter is similar to how:

• Gears make a clock tell time.

• Letters of the alphabet make words.

• Steel beams make different kinds of buildings.

• Grains of sand come together to create a large beach.

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What happens when an atom makes a connection with another atom?

• Their increase in size makes them visible to the human eye.

• The atoms create a more complex particle called a molecule.

• The atoms become a single atom depending on which one is stronger.

• They undergo a process that causes the to make copies of themselves.

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Which of these is NOT true of a molecule?

• All molecules have equally strong bonds.

• A molecule is composted of at least two atoms.

• All molecules are too small to be seen without aid.

• A molecule forms after two atoms create a chemical bond.

Why do scientists use models to portray molecules?

• Scientists have no other way to see molecules

• It is the only way they can provide proof for their work.

• It makes important aspects of the molecule easier to see.

• It is the only way they can figure out how to combine atoms

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Which of these is NOT a method that scientists use to create models?

• 2D line-angle formulas

• 3D computer representations

• 3D ball-and-stick models

• 2D laffer curve model

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What is one way scientists tell atoms apart when creating models since they all appear as round spheres?

• They use different colors.

• The use different shapes.

• They assign each atom a number.

• They limit the number of atoms they work with to eight.

How are scientists able to tell molecules apart?

• They use a special chemical solution

• They have to test the molecules in a lab.

• They are able to tell by the material molecules create.

• They identify molecules based on their unique composition and structure.

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What determines a molecule's atomic composition?

• The weight of the molecules and their properties

• The size of the molecule and its place on the periodic table.

• The types of elements and number of atoms in each element.

• The number of atoms in each element and the size of the molecule.

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What is the atomic difference between water (H₂O) and hydrogen peroxide (H₂O₂)?

• The only difference is that they have different structures

• Hydrogen peroxide has one more oxygen atom than water.

• The only difference is that they have different compositions.

• Atoms in water have stronger bonds than atoms in hydrogen peroxide.

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Which of these statements is NOT true of a molecule's chemical structure?

• Chemical structures are the same for all molecules.

• Chemical structure can determine a molecule's identity.

• Chemical structure affects the characteristics of a molecule.

• Chemical structure is the specific way in which the bonds and atoms are arranged in a molecule.