Chemical Changes

During a chemical reaction, the elements used for the reactants are Hydrogen, Oxygen and Carbon. What will be the elements for the products?

• Hydrogen and Oxygen

• Hydrogen and Carbon

• Water and Oxygen

• Hydrogen, Oxygen, and Carbon

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

In this chemical equation, 2H₂O₂ --> 2H₂O + O₂. How many oxygen atoms are in the product?

• 3

• 4

• 2

• 5

Tags

NGSS.MS-PS1-1

In order to maintain the Law of Conservation of Mass in a chemical equation, the element types and number of atoms should be ________________________?

• Equal

• Changed

• Balanced

• Reacted

Tags

NGSS.MS-PS1-5

The Law of Conservation of Mass applies to ?

• Chemical Changes only

• Physical Changes only

• Both Chemical and Physical Changes

• Neither Chemical or Physical Changes

Tags

NGSS.MS-PS1-5

A student was monitoring a chemical reaction in an experiment. She thought the reaction happened to quickly to study well. What could she do to reduce the rate of the chemical reaction?

• Decrease the temperature of the reaction

• Increase the temperature of the reaction

• Add less reactants to the reaction

• Record the reaction

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Glow sticks create light when the liquids inside them are mixed to create a chemical reaction. A student wanted to make the glow stick quit glowing as quickly as possible. What should he do?

• Put the glow stick in a refrigerator

• Put the glow stick in a warm oven

• Put the glow stick in room temperature water

• Put the glow stick in a dark closet

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

A team of scientists wanted to demonstrate the accuracy of their work. What should they do to prove to others their work was done well?

• A. Repeat the experiment multiple times to show the accuracy of their data

• B. Try to get their data posted online

• C. Get other scientists to perform their experiment to show others will get the same results

• D. Both A and C

Empirical Evidence is based on observation and experimentation. Which of the following would be an example of empirical evidence?

• A student draws a model of the solar system to understand the arrangement of planets.

• A student creates a play showing how oxygen was discovered.

• A student lists all their ideas about how to test the strength of a metal.

• A student records the temperature of water as it changes from a solid to a liquid.

Tags

NGSS.MS-PS3-4

What happens to matter that is going through a chemical change?

• It is destroyed

• It creates a new type of matter

• Matter is not created or destroyed, it only changes form

• Matter does not go through a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the difference between a chemical change and a physical change?

• A physical change creates a new substance, a chemical change does not.

• A chemical change creates a new substance, a physical change does not.

• A chemical change makes the substance look different but a physical change does not.

• A physical change makes the substance change color where a chemical change does not.

Tags

NGSS.MS-PS1-2