Chemical Reaction Properties

A product is

• The end result of a chemical property.

• The starting substances of a chemical reaction.

• The substance(s) formed at the end of a chemical equation

Why does a mass remains the same in a chemical reaction?

• Because of the rules of conservation

• Because the atoms also remains the same

• Because it does not become bigger

• Because gravity is always the same.

Tags

NGSS.MS-PS1-5

Why does the bonds break when heat is added?

Tags

NGSS.MS-PS1-4

What does the Law of Conservation of Mass state

Tags

NGSS.MS-PS1-5

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

• Yes, the amount of atoms for each element are equal on both the reactant and product side.

• No, the carbons are not the same number on both the reactant and product side.

• No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

• No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

Tags

NGSS.MS-PS1-5

Which of the following is a common sign that a chemical change has occurred?

• A chemical has turned a different color, bubbled, and/or changed temperature.

• A chemical has changed to a different state of matter, such as a liquid to a solid.

• A chemical has changed size.

• A chemical has become a different shape.

Tags

NGSS.MS-PS1-2

What type of change occurs when a new substance is formed that has different properties from the original substances?

• chemical change

• nuclear change

• physical change

• mutation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following represents a chemical change?

• cutting a piece of paper with scissors

• cooling a mixture of air and kerosene vapor to obtain liquid kerosene

• burning a piece of notebook paper in the presence of oxygen

• heating water over a flame to its boiling point

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In any chemical reaction, the mass of the products is always:

• slightly less than the mass of the reactants

• much less than the mass of the reactants

• the same as the mass of the reactants

• greater than the mass of the reactants

Tags

NGSS.MS-PS1-5

A chemical change is different than a physical change because in a chemical change

• chemicals are used

• molecules do not physically touch

• a new substance is formed and in a physical no new substance is formed

• the change can be seen but in a physical change it cannot

Tags

NGSS.MS-PS1-2