11 Counting Atoms and Chemical Reactions PRE-Assessment

LT#1: In 4Mg₂O₃, identify the coefficient.

• 2

• 3

• 4

• no coefficient shown

LT#1: Which of the following is true about the composition of 3H₂O?

• It is composed of 2 atoms of H and 1 atom of O

• It is composed of 5 atoms of H and 1 atom of O

• It is composed of 6 atoms of H and 3 atoms of H

• It is composed of 6 atoms of H and 4 atoms of H

Tags

NGSS.MS-PS1-1

LT#1: How many atoms of Oxygen are in a molecule of C₆H₁₂O₆, glucose?

• 3

• 6

• 12

• 24

Tags

NGSS.MS-PS1-1

LT#1: Which substances have the same number of Carbon atoms?

• substances 1 and 2

• substances 2, 3, and 4

• substances 2 and 3

• substances 1 and 3

Tags

NGSS.MS-PS1-1

LT#2: Use the chemical equation shown. What does the circled green 6 in 6O₂ represent?

• subscript

• coefficient

• yield sign

• product

Tags

NGSS.MS-PS1-1

• Balanced

• Unbalanced

Tags

NGSS.MS-PS1-5

• Balanced

• Unbalanced

Tags

NGSS.MS-PS1-5

• 3

• 5

• 6

• 10

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

LT#3: Which of the following is NOT an evidence of a chemical reaction?

• change in size

• precipitate (solid) formed

• gas bubbles produced

• color change

Tags

NGSS.MS-PS1-2

LT#3: The picture shows a blue liquid added to a clear liquid. Which is the BEST evidence that a chemical reaction may have occurred?

• solid particle formed

• volume increased when liquids are combined

• temperature does not change

• blue color changes to light blue when added to clear liquid

Tags

NGSS.MS-PS1-2