4/21: p106-107 Law of Conservation of Mass Practice Questions

The ​ (a)   is the number placed in front of a chemical symbol or formula in a balanced equation.

• coefficient
• equation
• formula
• process
• reaction
• subscript
• molecule
• reactant
• product
• atom

A chemical ​ (a)   has taken place when atoms of substances rearrange themselves into a new configuration.

• reaction
• equation
• formula
• process
• subscript
• molecule
• reactant
• product
• atom

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A chemical ​ (a)   is made up of chemical symbols and subscripts.

• formula
• equation
• process
• subscript
• molecule
• reactant
• product
• atom

The ​ (a)   is the number placed below and to the right of a chemical symbol to show how many atoms are present.

• subscript
• equation
• process
• molecule
• reactant
• product
• atom

A chemical ​ (a)   is a short way of writing a chemical reaction.

• equation
• process
• molecule
• reactant
• product
• atom

Which of the following is true regarding the atoms involved in a chemical reaction?

• Some of the atoms present before the reaction takes place will be lost during the chemical reaction.

• The same number of each type of atom will be present before & after the chemical reaction takes place and atoms will be created on the products side.

• Some of the atoms will be chemically changed into a different type of atom during a chemical reaction.

• The same number of each type of atom will be present before & after the chemical reaction takes place because atoms are not created or destroyed during chemical reacctions.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A student is using the key to model the chemical equation:

2KI + Cl₂ --> 2KCl + I₂

Upload the picture you took of #7 to represent the equation:

2KI + Cl₂ --> 2KCl + I₂

How many PURPLE beads will be needed to model BOTH sides of the equation? (a)  

(problem #7 on worksheet)

Tags

NGSS.MS-PS1-1

In a synthesis reaction, H₂O and ? react to form H₂SO₄.

Take a picture of the missing reactant you drew on your worksheet (problem #8).

What is the Chemical Formula of the missing reactant in #8? (a)  

*Type your answer below with NO SPACES between the letter and numbers...it's ok that the subscripts are big numbers.

Tags

NGSS.MS-PS1-1

Which of the following models of equations CORRECTLY demonstrates the Law of Conservation of Mass?

• NaCl --> Na + Cl₂

• 2Al + 3O₂ --> Al₂O₃

• Mg + 2HCl --> MgCl₂ + H₂

• 2Na + I₂ --> NaI

Tags

NGSS.MS-PS1-5