Chemical Reactions Unit Test

What is a Reactant?

• The end result of a chemical reaction.

• The arrow that separates the product from the reactant.

• The number to the lower right of an element that shows the number of atoms.

• The substance changed in a chemical reaction.

What is a Yield in a chemical reaction?

• The arrow that separates the product from the reactant.

• The end result of a chemical reaction.

• The number before a chemical formula that shows the number of molecules present.

• A written description of a chemical reaction.

Tags

NGSS.HS-PS1-7

The number before a chemical formula that shows the number of molecules present is call a?

• Yield

• Product

• Coefficient

• Reactant

_________ describes the number of elements in a compound.

• chemical symbol

• chemical formula

• chemical equation

• coefficient

Tags

NGSS.MS-PS1-1

______ is the end result of a chemical reaction.

• Product

• Yield

• Subscript

• Reactant

Tags

NGSS.HS-PS1-6

What is a chemical equation?

• Describes the number of elements in a compound.

• One or two letters that represent the elements on the periodic table.

• The number to the lower right of an element that shows the number of atoms bonded.

• A written description of a chemical reaction.

Tags

NGSS.HS-PS1-7

Bonds between two nonmetal atoms are 

• covalent.
• ionic.
• incomplete.
• complete.

Tags

NGSS.HS-PS1-3

The law of conservation of mass states

• chemical reactions create new atoms

• atoms cannot be created or destroyed

• reactants vanish once a reaction takes place

• products appear when a reaction takes place

Tags

NGSS.HS-PS1-7

Which of the following symbols is not a correct indication of the phase of a substance in a reaction?

• (s)=solid

• (g)=grams

• (l)=liquid

• (aq)= aqueous

Which is the correct chemical equation for the following: Solid Zn reacts with silver (I) chloride to produce Zinc (II) chloride and silver metal

• Zn + AgCl → ZnCl₂ + Ag

• ZnCl₂ + Ag → Zn + AgCl

• ZnCl2 + Ag₂ → Zn + AgCl

• Zn₂Cl + Ag → Zn + AgCl