Chemical Reactions Unit Study Guide

Which of the following is a mixture?

• Air (N₂ , O₂ , He , Ar , CO₂ , H₂O)
• Oxygen (O)
• Water (H₂O)
• Carbon dioxide (CO₂)

Which of the following is an element?

• Water (H₂O)
• Carbon dioxide (CO₂)
• Oxygen (O)
• Air (N₂ , O₂ , He , Ar , CO₂ , H₂O)

Tags

NGSS.MS-PS1-1

In the chemical reaction below, what are the products? 2 H₂O₂ → 2 H₂O + O₂

• 2 H₂O₂
• 2 H₂O
• 2 H₂O + O₂
• Oxygen Gas

What type of molecules have a low melting point?

• Complex molecules
• Simple molecules
• Elements
• Mixtures

Tags

NGSS.MS-PS1-4

Compounds can be separated only by __________.

• breaking the atoms into smaller pieces
• breaking the bonds between the atoms
• using a magnet to attract certain atoms
• evaporating the liquid that contains the atoms

The formation of rust on iron is a chemical change because ________.

• the color and shape have changed
• the mass and volume have changed
• the substance remains the same
• a new substance has been formed

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a chemical change?

• wood burning in a fireplace
• defrosting food in a microwave
• cutting an apple in half
• ice melting in a glass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

__________ is an example of a physical change.

• burning marshmallows
• cooking eggs
• melting ice cubes
• a tarnishing silver spoon

If a substance is producing an odor and bubbles are forming, then most likely there is a _________ change happening.

• physical
• chemical
• elemental
• no change is happening

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a compound?

• Air (N₂ , O₂ , He , Ar , CO₂ , H₂O)
• Oxygen (O)
• Helium (He)
• Carbon dioxide (CO₂)

Tags

NGSS.MS-PS1-1