What are the coefficients for: Al + HCl --> AlCl₃ + H₂?

• 2,2,2,3

• 2,1,6,3

• 2,6,2,3

• 3,6,2,3

Tags

NGSS.HS-PS1-7

Balance this equation-
__P₄+ __O₂--> __P₂O₃

• it is already balanced

• 2, 1, 3

• 1, 2, 3

• 1, 3, 2

Tags

NGSS.HS-PS1-7

Balance this equation: _N₂ + _H₂ --> _NH₃

• 1,2,3

• 1,3,2

• 1,1,2

• 2,1,1

Tags

NGSS.HS-PS1-7

What is the little number after an element in a chemical equation called? Example: H₂

• Coefficient

• Subscript

• Atom

• Equation

What is the arrow in a chemical equation...
H₂ + O --> H₂O

• Reactants

• Products

• Yields

• Chemical Equation

Tags

NGSS.MS-PS1-5

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled
• the product is half the mass of the reactants
• the mass is the same
• the mass changes depending on the reaction

Tags

NGSS.HS-PS1-7

When balancing equations, a ____ can be placed to the left of a formula of a substance to make the equations balanced.

• charge

• subscript

• random number

• coefficient

Which side of a chemical equation is the reactant side?

• Left (before the yields sign)
• Right (after the yields sign)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which side of a chemical equation is the product side?

• Left (before the yields sign)

• Right (after the yields sign)

Which problem is balanced?

• PbO2 + 2H2

• SO2 + H2O --> H2SO4

• 2Na + 2H2O --> 2NaOH + H2

Tags

NGSS.HS-PS1-7