TCI lesson 2: molecules and extended structures

1.

Multiple Choice

30 sec

1 pt

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.

2.

Multiple Choice

30 sec

1 pt

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.

3.

Multiple Choice

30 sec

1 pt

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.

4.

Multiple Choice

30 sec

1 pt

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

5.

Multiple Choice

30 sec

1 pt

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

6.

Multiple Choice

30 sec

1 pt

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.

7.

Multiple Choice

30 sec

1 pt

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.

8.

Multiple Choice

30 sec

1 pt

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.

9.

Multiple Choice

30 sec

1 pt

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.

10.

Multiple Choice

30 sec

1 pt

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.

11.

Multiple Choice

30 sec

1 pt

How do the different chemical structures, but similar compositions of sucrose and maltose affect their taste? (Lesson 2, section 2)

Their different chemical structures do not affect their taste.

Their different chemical structures mean that one tastes sweet and the other tastes bitter.

Their different chemical structures mean the sugars have different tastes, but are still sweet.

Their different chemical structures mean that one loses flavor over time while the other does not.

12.

Multiple Choice

30 sec

1 pt

Which of these statements is NOT true of crystals?

Crystals can be formed with a single element.

Crystal structures can go on forever in all three dimensions.

Their atoms are arranged in a repeating, three-dimensional subunits.

A single molecule in their composition can go on forever in all three dimensions.

13.

Multiple Choice

30 sec

1 pt

A diamond is a crystal that:

is made of one element.

is made of multiple elements.

extends forever.

has a spherical structure.

14.

Multiple Choice

30 sec

1 pt

How many of each atom does a quartz structure have?

1 silicon atom to 2 oxygen atoms

10 silicon atoms to 50 oxygen atoms

200 silicon atoms to 3,000 oxygen atoms

350 silicon atoms to 350 oxygen atoms

15.

Multiple Choice

30 sec

1 pt

How do molecules in a crystal arrange themselves?

Crystals of molecules always form in a spherical shape.

Crystals of molecules form in a regular, repeating pattern.

Crystals of molecules form in an irregular, diamond-like pattern.

Crystals of molecules always form in a shape similar to a snowflake.

16.

Multiple Choice

30 sec

1 pt

Which of these statements is true of a polymer?

The subunit is always an atom.

Polymers cannot extend forever.

The subunit is always a molecule.

The subunit can be a molecule or an atom.

17.

Multiple Choice

30 sec

1 pt

Which of these statements is NOT true of an extended structure?

Extended structures include crystals and polymers.

Extended structures are a type of complex polymer.

Extended structures have subunits that occur in a constant ratio.

Extended structures have subunits that are arranged in repeating patterns.

18.

Multiple Choice

30 sec

1 pt

How is carbon able to form both graphite and diamond?

Diamond is a carbon polymer and graphite is a carbon crystal.

Carbon can be arranged in different atomic-level structures.

Carbon bonds with different atoms to form both graphite and diamond.

Graphite's subunits have an irregular repeating pattern, but diamond subunits do not.

19.

Multiple Choice

30 sec

1 pt

Why is graphite a good writing tool, whereas diamond is not?

Graphite has hexagonal sheets which are weakly connected to each other, whereas diamond has a strong cubic structure.

Graphite has hexagonal sheets which are strongly connected to each other, whereas diamond has a weak cubic structure.

Graphite has a weak cubic structure, whereas diamond has hexagonal sheets which are strongly connected to each other.

Graphite has a strong cubic structure, whereas diamond has hexagonal sheets which are weakly connected to each other.

20.

Multiple Choice

30 sec

1 pt

Why do snowflakes have a hexagonal shape?

There are six atoms in a water molecule.

Crystals typically form in repeating patterns of six.

It is very difficult for a liquid to freeze into any other structure.

Their atomic-level structure is made up of crystals with six sides.

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