PS Unit 3 Lesson 4 Self Check Quiz

Which of the following can be observed from the model of water? Select all that apply. (3 choices)

• Water is a molecule.

• Water is a compound.

• Water is made up of three types of atoms.

• The microscopic structure of water.

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Another way to model water is with letters and lines like this:
H – O – H.

What is one way that these two models are different?

• They show different types and numbers of atoms.

• The atoms are connected in a different order.

• One model represents the three-dimensional structure of the molecule.

• One model clearly shows a repeating pattern

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Phosphorus has two forms, red and white. Consider the models of white phosphorus and red phosphorus. Select the correct terms to complete each statement.

The balls represent ​ (a)   ​ .

The sticks represent ​ (b)   ,

The two substances have different ​ (c)   .

This means each ​ (d)   has different properties.

• atoms
• chemical bonds
• structures
• substance
• atom

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Based on the models of these structures, white phosphorus is ​ (a)   . Red phosphorous is ​ (b)   .

Both are examples of ​ (c)   .

 

• a simple molecule
• an extended structure
• an element
• a compound

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The structure of carbon tetrachloride, CCl₄, is similar to the structure of carbon tetrabromide, CBr₄. Both molecules have four atoms connected to a central carbon atom. Does that mean the two substances have the same properties? Choose the best explanation.

• Yes, because molecules with similar structures must have the same properties.

• Yes, because the carbon atom determines the properties of both substances.

• No, because the types of atoms in a molecule and its structure both influence the properties of a substance.

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How are molecules, compounds, and pure substances related? Complete the explanation.

When two or more of the same type of atom or different types of atoms join together, a ​ (a)   is formed. When two or more of the atoms are different a ​ (b)   ​ is formed. So, ​ (c)   molecules are also compounds. ​ (d)   are pure substances

• molecule
• compound
• some
• Both molecules and compounds
• all
• no
• Only Molecules
• Only compounds

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What do models of molecules and extended structures show? Select all that apply. (3 choices)

• the color of the substance

• the structure of the substance

• the types of atoms in the substance

• how the atoms are arranged in the substance

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What is the relationship between the structure of a substance and the properties of a substance? Complete the explanation.

The ​ (a)   of atoms in a substance affects the properties of that substance. The ​ (b)   of a substance affects the properties of the substance. Substances with different structures have ​ (c)   properties.

• arrangement
• structure
• different
• color
• amount
• the same

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