Unit 04 Test Review - IPC

What must happen for a chemical change to occur?

• Substances must form a precipitate

• Substances must change state

• Substances must change in temperature

• Substances must react to form new substances

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

During an investigation, a student mixes two liquids in a beaker. The student recorded the following observations in her science notebook. I. Both liquids are clear prior to mixing. II. Both liquids are room temperature prior to mixing. III. The liquid turned pink when mixed. IV. The temperature of the liquid increased. V. Over time, a white solid formed at the bottom of the beaker. All of the following are evidence of a chemical reaction except —

• I and III

• II and IV

• I and II

• IV and V

Tags

NGSS.MS-PS1-2

Examine the chemical reaction above. How does the reaction above demonstrate the law of conservation of mass?

Tags

NGSS.MS-PS1-5

Name the products of the reaction above and list the number of oxygen atoms present in the products.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Name the reactants of the reaction above and list the total number of atoms present in the reactants.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens to the atoms of the reactants in a chemical reaction?

• They change into new atoms.

• They change names.

• Some are lost to the environment.

• They recombine to form the products.

Tags

NGSS.MS-PS1-5

Which of the following equations demonstrates the law of conservation of mass?

• 2H₂ + O₂ → 2H₂O₂

• 2K + Cl₂ → 2KCl

• C + O₂ → 2CO

• 2Fe + 3O₂ → Fe₂O₃

Tags

NGSS.MS-PS1-5

How does the equation below demonstrate the law of conservation of mass? 2H₂ + O₂ → 2H₂O

• The reactants and product contain the same number of elements.

• The reactants and product contain the same number and type of atoms.

• The reactants contain more oxygen than the product.

Tags

NGSS.MS-PS1-5

Which of the following equations represents the law of conservation of mass?

• 3Na + Cl₂ → 3NaCl

• 3AgBr + GaPO₄ → Ag₃PO₄ + GaBr₃

• CO₂ + H₂O → C₆H₁₂O₆ + O₂

• 2H₂O + O₂ → 2H₂O + OH

Tags

NGSS.MS-PS1-5

What are the byproducts of a combustion reaction? Select all that apply. (Hint: there are 3 answers)

• oxygen

• energy

• methane

• water

• carbon dioxide