Law of Conservation of Mass Test Review

The chemical formula for methane is CH₄. Which statement describes the atoms present in FOUR molecules of methane?  

• Four molecules of methane would contain 1 atom of carbon and 4 atoms of hydrogen.
• Four molecules of methane would contain 4 atoms of carbon and 1 atom of hydrogen.
• Four molecules of methane would contain 4 atoms of carbon and 16 atoms of hydrogen.
• Four molecules of methane would contain 16 atoms of carbon and 16 atoms of hydrogen.

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NGSS.MS-PS1-1

The chemical formula for acetic acid is CH₃COOH. How many hydrogen atoms are in one molecule of acetic acid?

• 3
• 4
• 5
• 6

Tags

NGSS.MS-PS1-1

Sodium sulfate Na₂SO₄ is used to produce many products. Which elements are represented in the formula AND how many atoms of each element are represented in the formula? Read the question carefully.  Then enter your answer in the space provided. (This is a short constructed response question so it needs to be in a COMPLETE SENTENCE.)

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NGSS.MS-PS1-1

This equation describes the chemical reaction that occurs during photosynthesis. 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ C₆H₁₂O₆ contains ________ atoms of carbon and ________ atoms of hydrogen.

• 1, 3
• 6,12
• 3, 6
• 1, 12

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NGSS.MS-PS1-5

NGSS.MS-PS1-1

6CO₂ + 6H₂0 + Sunlight → C₆H₁₂0₆ + 60₂ In the above formula, how many atoms of Carbon are on the product side of the equation?

• 6
• 2
• 13
• 12

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

How many atoms, in total, are in the chemical formula below? Co(NO₃)₂ There are  (a)   atoms in total.

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NGSS.MS-PS1-1

A student is given the formula H₂SO₄. Using the periodic table, which elements are in this compound?

• Helium, Silver, and Oxygen
• Helium, Sulfur, and Osmium
• Hydrogen, Sulfur, and Oxygen
• Hydrogen, Sodium, and Osmium

Tags

NGSS.MS-PS1-1

Which of the following statements correctly describes the role of atoms in a chemical reaction?

• Atoms are created or destroyed during a chemical reaction.
• Atoms are rearranged to form new substances during a chemical reaction.
• Atoms remain unchanged throughout the reaction process.
• Atoms are only involved in physical changes, not chemical changes.

Tags

NGSS.MS-PS1-5

#9 PART A The Periodic Table of Elements is shown. A chemical reaction occurs when vinegar (acetic acid) combines with baking soda (sodium bicarbonate). Carbon dioxide is released during the reaction causing bubbles to form. C₂H₄O₂ + NaHCO₃ → NaC₂H₃O₂ + H₂O +CO₂ Using the periodic table, what atoms are involved on both the reactant and product side of the chemical reaction?

• Carbon, Hydrogen, Oxygen, and Sodium
• Nitrogen, Carbon Dioxide, and Water
• Carbon Dioxide, Hydrogen, and Sodium
• Hydrogen, Nitrogen, Carbon, and Oxygen

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

NGSS.MS-PS1-2

#9 PART B The Periodic Table of Elements is shown. A chemical reaction occurs when vinegar (acetic acid) combines with baking soda (sodium bicarbonate). Carbon dioxide is released during the reaction causing bubbles to form. C₂H₄O₂ + NaHCO₃ → NaC₂H₃O₂ + H₂O +CO₂ Which statement supports part A?

• The atoms do not change positions during the chemical reaction process.
• Atoms are rearranged to form a new substance during a chemical reaction.
• New atoms are created after a chemical reaction has occurred.
• Some of the atoms are destroyed during the chemical reaction.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2