Introduction to Chemical Equations and Reactions

This image shows the product of a chemical reaction. Which is the name of the kind of solid substance formed in this type of chemical reaction?

• aqueous

• precipitate

• acid

• synthesis

Tags

NGSS.MS-PS1-2

Which example provides evidence that a chemical reaction has occurred.

• dissolving

• melting

• formation of a gas

• bending

Tags

NGSS.MS-PS1-2

How many oxygen atoms are present in the following? 
4Ca(OH)₂

• 4
• 6
• 8
• 1

Tags

NGSS.MS-PS1-1

Which of the following describes a chemical change?

• water freezes to form ice

• sugar dissolves in water

• gasoline burns in a car engine

• a piece of metal expands when it is heated

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• chemical change

• nuclear change

• physical change

• mutation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following describes 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 every 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

How many carbon atoms are present in this chemical equation?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

The left side of this equation is called ________________.

• products

• reactants

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The right side of this equation is called ________________.

• products

• reactants

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5