H.Chem- 70% Summative- Chemical Reactions Unit

What happens in a chemical reaction?

• The mass of the products is greater than the mass of the reactants.

• Heat must be added to the reactants.

• The mass of the reactants must equal the mass of the products.

• Atoms are heated and cooled.

Tags

NGSS.HS-PS1-7

CHECK BOX ALL the choices that can serve as evidence that a chemical reaction has occurred?

• change in temperature

• production of gas

• change in density

• formation of a precipitate

• formation of an odor

What are the coefficients of the correctly balanced equation? ___Fe₂O₃ + ___CO → ___Fe + ___CO₂

• 1,3,2,3

• 0,2,2,3

• 1,2,2,2

• 2,6,4,3

Tags

NGSS.HS-PS1-7

Which of the following is a correct balanced equation?

• H₂ + Br₂ → 2HBr

• H₂ + Br₂ → HBr

• H₂ + 2Br₂ → 2HBr

• 2H₂ + Br₂ → HBr

Tags

NGSS.HS-PS1-7

Mathematical Equivalence

OFF

Which of the following represents a chemical reaction?

• Salt dissolved in water

• Gasoline combusts in a car engine.

• Water is boiled

• Copper metal is stretched into a wire.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of reaction is shown below? Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)

• anionic single replacement

• synthesis

• double replacement

• cationic single replacement

Which of the following equations is a correct and balanced equation with a proper chemical reaction statement?

• 2Na + Cl₂ → 2NaCl which is a single replacement reaction

• 2Na + Cl₂ → NaCl₂

  which is a single replacement reaction

• Na + Cl₂ → 2NaCl

  which is a synthesis reaction

• 2Na + Cl₂ → 2NaCl which is a synthesis reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In what type of reaction is a compound reactant is broken down into other smaller substances?

• synthesis

• single replacement

• decomposition

• double replacement

Will the following reaction occur? Pb + Ca(C₂H₃O₂)₂ → Ca + Pb(C₂H₃O₂)₂

• Yes, lead will replace calcium.

• Yes, acetates are always soluble.

• No, lead cannot replace calcium.

• No, lead will not react with acetate.