Chemical Reactions

Patrik works at a company that makes paper and needs a chemical to make the paper brighter. He mixed two colorless substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances. After mixing, Patrik found two white substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemist mixed two substances together: a blue powder with no smell and a colorless liquid with a strong smell. Their repeating groups of atoms are shown above on the left. After they were mixed, the chemist analyzed the results and found two substances. One ending substance had the repeating group of atoms shown above on the right. Is the ending substance the same substance as the blue powder? What happened to the atoms of the starting substances when the ending substances formed? Be sure to explain your answers to both of these questions.

• The ending substance is a different substance than the blue powder. It must be a different substance because the ending substance has one atom from the colorless liquid and one atom from the blue powder

• The ending substance is a same substance than the blue powder. It must be a the same substance because the ending substance has one atom from the colorless liquid and one atom from the blue powder

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Sahil watched a demonstration in which a scientist combined two substances in a sealed container and analyzed the results. The ending substances did not look the same as the starting substances. Sahil was given a diagram with the repeating groups of atoms that make up the starting substances, plus information about the properties of the starting and ending substances. He created a model of the repeating groups of atoms that might make up the two ending substances. Does his model correctly show why the properties of the ending substances are different from the properties of the starting substances? Describe what could be correct or incorrect about his model.

• Sahil’s model contains both correct and incorrect elements.

• Sahil’s model contains only correct elements.

• Sahil’s model contains only incorrect elements.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

The diagram above shows the repeating groups of atoms that make up two samples. Will the properties of the two samples likely be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

• The properties will likely be different because the repeating groups of atoms that make up each sample are different.

• The properties will likely be different because there are more repeating groups of atoms in Sample 2.

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same number of atoms.

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have two of the same types of atoms.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

The diagram above shows the repeating groups of atoms that make up two samples. Will the properties of the two samples likely be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

• The properties will likely be different because the repeating groups of atoms that make up each sample are different.

• The properties will likely be different because there are more repeating groups of atoms in Sample 1.

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have one of the same types of atoms.

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same number of atoms.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

The diagram above shows the repeating groups of atoms that make up two samples. Both samples are green gases at room temperature. Will the other properties of the two samples be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

• The other properties will be the same because the repeating groups of atoms that make up the two samples are the same.

• The other properties will be different because there are more repeating groups of atoms in Sample 2..

• The other properties will be the same because both samples are green at room temperature.

• The other properties will be the same because both samples are gases at room temperature.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

The diagram above shows the repeating groups of atoms that make up two samples. Both samples are liquid at room temperature. Will the properties of the two samples likely be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same types of atoms.

• The properties will likely be the same because both samples are liquids at room temperature.

• The properties will likely be different because the repeating groups of atoms that make up the two samples have different numbers of atoms.

• The properties will likely be different because there are more repeating groups of atoms in Sample 1.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

What is the process by which a chemical change occurs?

• Conservation of Matter

• Physical Change

• Chemical reaction

• Condensation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What always happens during a chemical change?

• The material and its properties change

• The material dissolves

• The total mass of the material changes

• The material changes state from a solid to a liquid

Tags

NGSS.MS-PS1-2

What is the best definition of a chemical change?

• A change in the state of matter in which the form changes but the properties stay the same.

• A change in the state of matter in which the material changes into an entirely different material with properties that are different from the original material.

• A change in the state of matter in which the material is still the same just in a different form.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5