Chemical reactions

Which of the following models best demonstrates a balanced chemical equation?

• F
• G
• H
• J

Tags

NGSS.MS-PS1-5

The formula below represents the most common carbohydrate known as glucose. Which information can be determined from the chemical formula?
C₆H₁₂O₆

• The structural arrangement of the atoms in a glucose molecule
• The color of a glucose molecule
• The size of a glucose molecule
• The number of atoms of each element in a glucose molecule

Tags

NGSS.MS-PS1-1

The reactants are on the left side of the chemical equation.

• True
• False

Tags

NGSS.MS-PS1-5

In a ___________change, a substance changes into a different substance.

• Physical

• Chemical

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same

• that matter can only be changed into new substances by introducing a catalyst

• that matter exists in the same state throughout any chemical change

• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

How many Al atoms are in this compound? 4Al₂O₃

• 2

• 8

• 6

• 4

Tags

NGSS.MS-PS1-1

How many F atoms are in this compound?

6MgF₂

• 2

• 6

• 8

• 12

Tags

NGSS.MS-PS1-1

___________________ are the elements or compounds that leave (are formed in) a chemical reaction.

• Polymers

• Bonds

• Reactants

• Products

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The coefficients needed to balance this equation are:
_Fe + _S --> _FeS

• 2,2,1
• 1,1,1
• 1,2,1
• 1,1,2

Tags

NGSS.MS-PS1-5

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

• change in shape
• melting
• formation of a gas
• dissolving

Tags

NGSS.MS-PS1-2