Unit 3 lesson 2 (Chemical equations model chemical reactions)

What is the term for the number that appears below and to the right of a symbol in a formula?

• Subscript

• superscript

• Exponent

• Coefficient

In a chemical equation, what is the term for the numerical factor that indicates the relationship between the elements?

• Coefficient

• Ion

• Atom

• Isotope

Tags

NGSS.MS-PS1-5

True or false?

Chemical substances have a unique and well-defined chemical structure; they consist of a fixed ratio of atoms that are bonded together in a definite spatial arrangement. 

• True

• False

Tags

NGSS.MS-PS1-1

In scientific terms, what represents a chemical process by using symbols and formulas?

• Chemical bond

• Chemical symbol

• Chemical process

• Chemical equation

Tags

NGSS.MS-PS1-1

Why is the Law of Conservation of Matter important in chemistry?

• It limits the types of products formed in a reaction

• It reduces the need for balancing chemical equations

• It helps track the total amount of matter in reactions

• It ensures reactions will always proceed to completion

Tags

NGSS.MS-PS1-5

What is the term used to define 'a type of matter with a fixed composition that can be identified by its properties'?

• chemical solution

• chemical reaction

• chemical substance

• chemical mixture

How are coefficients related to the subscripts in a chemical equation?

• They are divided by the subscripts

• They cancel out the effect of subscripts

• They are multiplied to determine the number of atoms or molecules

• They are added to the subscripts

Tags

NGSS.MS-PS1-5

How many Mn atoms are found in the following compound?

2MnO₄

• 1

• 2

• 4

• 8

Tags

NGSS.MS-PS1-1

What is the left part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Yields

• Products

• Reactants

• Chemical equation

What is the right part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Reactants

• Yields

• Products

• Chemical Equation