PS1.6

In a balanced chemical equation, the number of the reactants is equal to the___.

• atomic mass of the elements.
• atoms in a molecule.
• number of the products.
• volume of the reactants.

Tags

NGSS.HS-PS1-7

Which of the following represents the word equation magnesium + oxygen --> magnesium oxide?

• 2Mg + O₂ --> 2MgO
• MgO + O --> MgO₂
• CH₄+ O₂ --> CH₄O₂
• 2CH₄ + O₂ --> 2CH₃OH

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following represents a double-displacement reaction between sodium chloride and silver fluoride?

• NaCl + AgF --> NaF + Cl₂ + Ag
• NaCl + AgF --> NaF + AgCl
• NaCl + AgF --> NaAgF + Cl₂
• NaCl + AgF --> Ag + NaClF

Pieces of molecules that have one or more electrons available for bonding are ________.

• radicals
• reactants
• neutrons
• protons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which reaction type? 2NH₃ --> N₂ + 3H₂

• synthesis reaction

• decomposition reaction

• single-displacement reaction

• double-displacement reaction

Which reaction type? 2NaCl + H₂SO₄ --> Na₂SO₄ + 2HCl

• synthesis reaction

• decomposition reaction

• single-displacement reaction

• double-displacement reaction

Which reaction type? Fe + S --> FeS

• synthesis reaction

• decomposition reaction

• single-displacement reaction

• double-displacement reaction

Which reaction type? 2Li + 2H₂O --> 2LiOH + H₂

• synthesis reaction

• decomposition reaction

• single-displacement reaction

• double-displacement reaction

Which of these is not a sign of a chemical reaction?

• Heat is released.
• 
  A color change occurs.
• The material dissolves.
• A gas is given off.

Tags

NGSS.MS-PS1-2

Which of the following stores chemical energy?

• 
  the density of a substance
• the bonds of a molecule
• the nucleus of an atom
• the temperature of a substance

Tags

NGSS.HS-PS1-4