Unit #7 Investigating Chemical formulas and Reactions

Which of the following models best demonstrates a balanced chemical equation?

• F
• G
• H
• J

Tags

NGSS.MS-PS1-5

The formula below represents carbohydrate known as glucose. How many carbon atoms are present?

C₆H₁₂O₆

• 4

• 3

• 12

• 6

Tags

NGSS.MS-PS1-1

Which of the following equations demonstrates an actual chemical reaction that forms a new substance?

• A
• B
• C
• D

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The chemical formula for glucose, a simple sugar, is C₆H₁₂O₆. The formula for ethanol is C₂H₆O. What differences are there in these compounds?

• The elements that make up glucose are different than the elements that make up ethanol

• The number of atoms of the elements is different in ethanol than in glucose

• The chemical properties of the elements are different in glucose and ethanol

• Glucose has more elements than the ethanol

Tags

NGSS.MS-PS1-1

Which of these formulas contain equal numbers of nitrogen atoms?

• Formulas I and III

• Formulas I and IV

• Formulas II and III

• Formulas I, II, and V

Tags

NGSS.MS-PS1-1

The reactants are on the left side of the chemical equation.

• True
• False

Tags

NGSS.MS-PS1-5

Two clear colorless solutions were combined.

The student observed that the temperature changed from 25 •C to 23 •C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?

• One of the original elements came out of one of the solutions.

• The solutions reacted chemically and formed a precipitate.

• Some of the water froze into ice crystals.

• Rapid evaporation of water occurred, leaving a solid.

Tags

NGSS.MS-PS1-2

The equation below represents a chemical reaction that occurs in living cells. How many atoms are represented in the reactants of this equation?

• 6 total atoms

• 12 total atoms

• 24 total atoms

• 36 total atoms

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

In which of these compounds are there twice as many oxygen atoms as to hydrogen atoms?

• H₃PO₄

• H₂SO₄

• HCIO₃

• H₂O

Tags

NGSS.MS-PS1-1

How many total atoms are in one molecule of serotonin?

C₁₀H₁₂N₂O

• 22

• 24

• 25

• 4

Tags

NGSS.MS-PS1-1