Balancing Equations and Reaction Types Test

The substances listed on the right side of a chemical equation are the

• Yields
• Reactants
• Products
• Precipitates

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

CaCO₃ represents a chemical

• Symbol
• Formula
• Subscript
• Reaction

Tags

NGSS.MS-PS1-1

The substances listed on the left side of a chemical equation are the

• Products
• Coefficients
• Precipitates
• Reactants

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.
• The total mass of the reactants is greater than the total mass of the products.
• The total mass of the reactants is less than the total mass of the products.
• Matter is not changed.
  

Tags

NGSS.MS-PS1-5

How many Oxygen (O) atoms are in 2C₂HO₈C_l2

• 2
• 16
• 8
• 5

Tags

NGSS.MS-PS1-1

How many Hydrogen (H) atoms are in NH₃O5

• 3
• 4
• 5
• 1

Tags

NGSS.MS-PS1-1

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

Tags

NGSS.MS-PS1-1

Which of the following represent chemical equations? Check all that apply.

• $2Na\ +\ H_2O\ \rightarrow\ 2NaOH\ +\ H_2$

• $2KClO_3\ \ \rightarrow\ 2KCl\ +\ 3O_2$

• $2Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3$

• $2H_2O$

• $3O_3\ ,\ H_2O$

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Review the image and then pick the scenario below which best illustrates the Law of Conservation of Mass.

• A scientist adds 5g of Substance A to 5g of Substance B. A reaction occurs that produces 10g of Substance C.

• A scientist adds 5g of Substance A to 5g of Substance B. A reaction occurs that produces 15g of Substance C.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Observe the reaction shown here. The formula for this equation is  $N_2\ +\ H_2\ \rightarrow\ NH_3$  . What do you observe about the atoms of hydrogen in this reaction?

• There are 2 atoms of hydrogen in the reactants and only 1 in the products. This violates the Law of Conservation of Mass.

• There are 2 atoms of hydrogen in the reactants and 3 in the products. This violates the Law of Conservation of Mass. 

• There are 2 atoms of hydrogen in the reactants and 2 in the products. This is in line with the Law of Conservation of Mass. 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5