Characteristics of Chemical Reactions

When vinegar and baking soda are combined, bubbles begin to form. Explain how the formation of bubbles is evidence of a chemical reaction.

• Bubbles are cool.

• Bubbles are evidence of a chemical reaction because they indicate that a solid was formed.

• Bubbles are REALLY cool

• Bubbles are evidence of a chemical reaction because they indicate that gas was formed.

Tags

NGSS.MS-PS1-2

Four students performed four different investigations by combining different substances. Their results are shown in the table below. In which experiment did a chemical reaction take place, and how do you know?

• Experiment 1 because bubble are cool.

• Experiment 2 and 4 because density.

• Experiment 3 because the crystals dissolved and formed a liquid.

• Experiment 1 because bubbles indicate a new substance was formed.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When Juan got home from school, he noticed a foul smell coming from the kitchen. He decided to investigate the smell and found fruit sitting on the counter. There was evidence that a chemical reaction had occurred. When he looked at the fruit, he saw that it had turned brown and was soft to the touch. What is reasoning to support your evidence and claim?

• Atoms that make up original substances are regrouped into different molecules. The bad smell and change of color proves that there was a chemical reaction which created a new substance that is different than the original fruit.

• The bad smell and color change mean a new fruit was born.

• There were no bubbles= not cool

• The fruit was rotten

Tags

NGSS.MS-PS1-2

Rust forming on a piece of iron is an example of:

• A physical change because the process can be reversed.

• A violation of the laws of physics because new mass has been created.

• The natural process of decay as metallic ions age.

• A chemical change because oxygen atoms from the atmosphere bonded with the iron atoms.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When Juan got home from school, he noticed a foul smell coming from the kitchen. He decided to investigate the smell and found fruit sitting on the counter. There was evidence that a chemical reaction had occurred. When he looked at the fruit, he saw that it had turned brown and was soft to the touch. What is a possible CLAIM that explains how Juan knew a chemical reaction had occurred in the fruit.

• The fruit was rotten.

• The fruit looked and smelled gross.

• The fruit was exposed to conditions that caused the students to rot.

• The food did not look yummy.

Tags

NGSS.MS-PS1-2

When Juan got home from school, he noticed a foul smell coming from the kitchen. He decided to investigate the smell and found fruit sitting on the counter. There was evidence that a chemical reaction had occurred. When he looked at the fruit, he saw that it had turned brown and was soft to the touch. What is EVIDENCE that supports the claim that a chemical reaction took place?

• It looked gross.

• It changed color, smelled bad, and turned soft.

• It did not taste good.

• It smelled bad and turned soft.

Tags

NGSS.MS-PS1-2

The process by which one or more substances

change to produce one or more different

substances

• chemical reaction

• compound

• chemical process

• molecule

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The process by which one or more substances

change to produce one or more different

substances

• chemical reaction

• compound

• chemical process

• molecule

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

An insoluble solid formed from a chemical

reaction

• atom

• precipitate

• molecule

• gas

Tags

NGSS.MS-PS1-2

A substance that takes part in and undergoes change during a chemical reaction

• product

• reactant

• properties

• molecule