Physical & Chemical Changes/Solutions

Hey science explorers! Elias and Jatziry are on a quest to discover what a chemical change is. Can you help them figure it out?

• A change that occurs when one or more substances change into entirely new substances with different properties

• A change that does not produce a new substance

• A change that involves only a physical transformation

• A change that results in the same substances

Answer explanation

A chemical change involves the transformation of one or more substances into new substances with different properties, distinguishing it from physical changes that do not alter the substance's identity.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Hey science detectives! Can you help Martin figure out which of the following is a sign of a chemical change?

• Tearing paper

• Bending metal

• Gas production

• Melting ice

Answer explanation

Gas production is a clear indicator of a chemical change, as it often signifies a reaction occurring. In contrast, tearing paper, bending metal, and melting ice are physical changes.

Tags

NGSS.MS-PS1-2

Hey science explorers! Pablo and Leslie are on a quest to understand changes in matter. Can you help them figure out what a physical change is?

• A change that results in the formation of new substances

• A change that does not produce a new substance

• A change that involves chemical reactions

• A change that creates new substances with different properties

Answer explanation

A physical change is defined as a change that does not produce a new substance. Unlike chemical changes, physical changes alter the form or appearance of a substance without changing its chemical composition.

Hey science explorers! Martin and Chloe are conducting an experiment. Can you help them figure out what a chemical reaction is?

• A change that involves only physical transformations

• A change caused by the interaction of two or more substances resulting in the formation of new substances

• A change that does not involve new substances

• A change that only involves temperature change

Answer explanation

A chemical reaction involves the interaction of two or more substances, leading to the formation of new substances. This distinguishes it from physical changes, which do not create new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Aydeen and Chloe are exploring a dark room with a mysterious glow. Which of the following is an example of a chemical change that lights up the room?

• Glow sticks

• Burning wood

• Leaves changing color

• Skunk producing odor

Answer explanation

Glow sticks demonstrate a chemical change as they produce light through a chemical reaction. In contrast, burning wood, leaves changing color, and skunk odor do not primarily indicate light production.

Imagine you're in a science class with Diamond and Leslie, and you're exploring the wonders of chemistry. What is a sign of a chemical change that involves a temperature change?

• Glow sticks

• Burning wood

• Leaves changing color

• Skunk producing odor

Answer explanation

Burning wood is a clear sign of a chemical change as it releases heat and light, indicating a temperature change. In contrast, glow sticks, leaves changing color, and skunk odor do not primarily involve significant temperature changes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Jennifer and Elias are on a nature walk. Which process do they observe when they see a color change in the environment?

• Glow sticks

• Burning wood

• Leaves changing color

• Skunk producing odor

Answer explanation

Leaves changing color indicates the process of photosynthesis slowing down in autumn, leading to a visible color change in foliage. This is a clear environmental change, unlike the other options.

During a fun science experiment, Seth and April mixed two mysterious solutions. What magical chemical change did they observe that resulted in the formation of a precipitate?

• Glow sticks

• Burning wood

• Mixing two solutions to form a solid

• Skunk producing odor

Answer explanation

Mixing two solutions to form a solid is a classic example of a chemical change that produces a precipitate, as the solid forms from the reaction of the two liquids.

Tags

NGSS.MS-PS1-2

During a fun science experiment, Leslie and David are trying to identify signs of a chemical change. Which of the following is a sign of a chemical change indicated by odor?

• Glow sticks

• Burning wood

• Leaves changing color

• Skunk producing odor

Answer explanation

The skunk producing odor is a clear sign of a chemical change, as it involves the release of new substances (odorous compounds) during the process. In contrast, glow sticks, burning wood, and leaves changing color do not primarily indicate odor-related chemical changes.

Tags

NGSS.MS-PS1-2

During a fun science experiment, Norma and Elias observed something fascinating. Which of the following did they notice as a clear indicator of a chemical reaction?

• Change in size

• Emission of light or heat

• Increase in weight

• Decrease in temperature

Answer explanation

Emission of light or heat is a clear indicator of a chemical reaction, as it signifies energy changes. Other options like change in size or weight may occur without a chemical reaction.

Tags

NGSS.MS-PS1-2