Marvelous Molecules

What elements make up an ice crystal?

• Hydrogen and Oxygen

• Hydrogen and Carbon

• Oxygen and Carbon

• Silicon and Oxygen

Tags

NGSS.MS-PS1-1

Why doesn't Polyethelyne (Plastic) dissolve in water?

• Polyethylene is too thin to dissolve in water.

• Polyethylene is has nonpolar covalent bonds. This means it does not interact with water molecules.

• Polyethylene is made of hydrogen. Any element with hydrogen doesn't dissolve in water.

• Polyethelene has a high melting point. This means that its temperature is too high to dissolve in water.

Tags

NGSS.MS-PS1-2

Pick the model that shows quartz. (Hint: Look at the types of atoms)

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Tags

NGSS.MS-PS1-1

Diamonds and Graphite are both made of Carbon. Why is one easy to write with and the other good for jewelry?

• They have different properties because of how the Carbon atoms are arranged (different structure).

• They have different properties because Carbon can change size.

• They have different properties because they both have covalent bonds.

• Differences between carbon and diamonds are due to random chance.

Tags

NGSS.MS-PS1-1

Why does salt dissolve in water?

• Because it has a low melting point.

• Because it has ionic bonds.

• Because it is in a crystal shape

• Salt dissolves in water due to random chance.

Apply your knowledge about molecules and their structure to sugar.

• Sugar is made of only non-metals

• Why does sugar have covalent bonds?

• Carbon, Hydrogen, and Oxygen.

• How are the atoms of sugar joined together?

• It is has bonds between atoms.

• Elements of Glucose.

• It is made of polar covalent bonds.

• Why does sugar dissolve in water?

Tags

NGSS.MS-PS1-1

Choose all the correct answers.

• Atoms join together through bonds. These form molecules.

• The types of bonds between atoms can determine their properties.

• The structure/shape of a molecule can determine its properties.

• Molecules with ionic bonds will likely dissolve in water.

• Molecules can only be made of 1 type of atom.

Tags

NGSS.MS-PS1-1

Why does ice float on water?

• Because ice is made of Hydrogen and Oxygen.

• Because of the shape of ice crystals. They are more spread apart than water (less dense)

• Because ice is in a solid state

• Ice floats on water due to random chance.

Tags

NGSS.MS-PS1-1

What elements make up salt?

• Sodium (Na)

  and Oxygen (O)

• Silicon (Si) and Oxygen (O)

• Sodium (Na) and Chlorine (Cl)

• Carbon (C)

Tags

NGSS.MS-PS1-1

What element(s) make up both Diamonds and Graphite

• Carbon

• Hydrogen and Oxygen

• Silicon

• Sodium

Tags

NGSS.MS-PS1-1